Powered CMOS RS-232 Drivers/Receivers ADM223/ADM230L-ADM241L ADM2

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Powered CMOS RS-232 Drivers/Receivers ADM223/ADM230L-ADM241L ADM2

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FEATURES Single Power Supply Meets EIA-232-E V.28 Specifications kB/s Data Rate On-Board DC-DC Converters Output Swing with Supply Small Capacitors Power Shutdown Receivers Active Shutdown (ADM223) Receiver Input Levels Latch-Up FREE Plug-In Upgrade MAX223/230-241 Plug-In Upgrade AD230-AD241 APPLICATIONS Computers Peripherals Modems Printers Instruments GENERAL DESCRIPTION
Powered CMOS RS-232 Drivers/Receivers ADM223/ADM230L-ADM241L
ADM232L TYPICAL OPERATING CIRCUIT
INPUT +10V VOLTAGE DOUBLER 6.3V 6.3V 6.3V
+10V -10V VOLTAGE INVERTER
T1OUT T2OUT R1IN R2IN
TTL/CMOS INPUTS*
T1IN T2IN
RS-232 OUTPUTS
TTL/CMOS OUTPUTS
R1OUT R2OUT
RS-232 INPUTS**
ADM232L
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
ADM2xx family line drivers/receivers intended EIA-232-E V.28 communications interfaces, especially applications where available. ADM223, ADM230L, ADM235L, ADM236L ADM241L feature power shutdown mode which reduces power dissipation less than making them ideally suited battery powered equipment. receivers remain enabled during shutdown ADM223. ADM233L ADM235L require external components particularly useful applications where printed circuit board space critical.
members ADM230L family, except ADM231L ADM239L, include internal charge pump voltage converters which allow operation from single supply. These converters convert input power required RS-232 output levels. ADM231L ADM239L designed operate from supplies. internal charge pump voltage converter generates supply. ADM2xxL enhanced upgrade AD2xx family featuring lower power consumption, faster slew rate operation with smaller capacitors.
Table Selection Table
Part Number ADM223 ADM230L ADM231L ADM232L ADM233L ADM234L ADM235L ADM236L ADM237L ADM238L ADM239L ADM241L REV.
Power Supply Voltage +7.5 +13.2 +7.5 +13.2
RS-232 Drivers
RS-232 Receivers
External Capacitors None None
Power Shutdown (SD) (SD)
Three-State (EN)
Pins
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
(ADM223, 31L, 32L, 34L, 36L, 38L, 39L, 41L); (ADM230L, 33L, 35L, 37L); 13.2 (ADM231L ADM239L); C1-C4 Ceramic. Specifications TMIN TMAX unless otherwise noted.)
0.05 Units Volts V/µs V/µs
Parameter Output Voltage Swing Power Supply Current Power Supply Current Shutdown Supply Current Input Logic Threshold Low, VINL Input Logic Threshold High, VINH Logic Pull-Up Current RS-232 Input Voltage Range RS-232 Input Threshold RS-232 Input Threshold High RS-232 Input Hysteresis RS-232 Input Resistance TTL/CMOS Output Voltage Low, TTL/CMOS Output Voltage High, TTL/CMOS Output Leakage Current Output Enable Time (TEN) Output Disable Time (TDIS) Propagation Delay Instantaneous Slew Rate1 Transition Region Slew Rate Output Resistance RS-232 Output Short Circuit Current
NOTE Sample tested ensure compliance. Specifications subject change without notice.
Test Conditions/Comments Transmitter Outputs Loaded with Ground Load, TINS (Except ADM223) Load, TINS ADM231L, ADM239L Load, ADM231L ADM239L Only TIN, TIN,
IOUT -1.0 VCC, ROUT ADM223, ADM235L, ADM236L, ADM239L, ADM241L (Figure ADM223, ADM235L, ADM236L, ADM239L, ADM241L (Figure RS-232 +25°C 2500 Measured from VOUT
ABSOLUTE MAXIMUM RATINGS*
25°C unless otherwise noted)
-0.3 (VCC +0.3 Input Voltages -0.3 (VCC Output Voltages TOUT (V+, (V-, ROUT -0.3 (VCC Short Circuit Duration TOUT .Continuous Power Dissipation N-14 (Derate mW/°C above +70°C) N-16 (Derate 10.5 mW/°C above +70°C) N-20 (Derate mW/°C above +70°C) N-24 (Derate 13.5 mW/°C above +70°C) 1000 N-24A (Derate 13.5 mW/°C above +70°C) R-16 SOIC (Derate mW/°C above +70°C) R-20 SOIC (Derate mW/°C above +70°C) R-24 SOIC (Derate mW/°C above +70°C) R-28 SOIC (Derate 12.5 mW/°C above +70°C) RS-28 SSOP (Derate mW/°C above +70°C) Q-14 Cerdip (Derate mW/°C above +70°C) Q-16 Cerdip (Derate mW/°C above +70°C) Q-20 Cerdip (Derate 11.2 mW/°C above +70°C) Q-24 Cerdip (Derate 12.5 mW/°C above +70°C) 1000 D-24 Ceramic (Derate mW/°C above +70°C) 1000
Thermal Impedance, N-14 140°C/W N-16 135°C/W N-20 125°C/W N-24 120°C/W N-24A 110°C/W R-16 SOIC 105°C/W R-20 SOIC 105°C/W R-24 SOIC 85°C/W R-28 SOIC 80°C/W RS-28 SSOP 100°C/W Q-14 Cerdip 105°C/W Q-16 Cerdip 100°C/W Q-20 Cerdip 100°C/W Q-24 Cerdip 55°C/W D-24 Ceramic 50°C/W Operating Temperature Range Commercial Version) +70°C Industrial Version) -40°C +85°C Storage Temperature Range -65°C 150°C Lead Temperature, Soldering +300°C Vapour Phase sec) +215°C Infrared sec) +220°C Rating >2000
*This stress rating only functional operation device these other conditions above those indicated operaion sections this specification implied. Exposure absolute maximum rating conditions extended periods time affect reliability.
REV.
ADM223/ADM230L-ADM241L
ORDERING GUIDE
Model ADM223 ADM223AR ADM223ARS Temperature Range -40°C +85°C -40°C +85°C Package Option* R-28 RS-28 Model ADM230L ADM230LJN ADM230LJR ADM230LAN ADM230LAR ADM230LAQ ADM233L ADM233LJN ADM233LAN Temperature Range +70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C +70°C -40°C +85°C Package Option* N-20 R-20 N-20 R-20 Q-20 N-20 N-20 Model ADM231L ADM231LJN ADM231LJR ADM231LAN ADM231LAR ADM231LAQ ADM234L ADM234LJN ADM234LJR ADM234LAN ADM234LAR ADM234LAQ ADM237L ADM237LJN ADM237LJR ADM237LAN ADM237LAR ADM237LAQ ADM241L ADM241LJR ADM241LAR ADM241LJRS ADM241LARS Temperature Range +70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C +70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C +70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C +70°C -40°C +85°C +70°C -40°C +85°C Package Option* N-14 R-16 N-14 R-16 Q-14 N-16 R-16 N-16 R-16 Q-16 N-24 R-24 N-24 R-24 Q-24 R-28 R-28 RS-28 RS-28
ADM232L ADM232LJN ADM232LJR ADM232LAN ADM232LAR ADM232LAQ
+70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C
N-16 R-16 N-16 R-16 Q-16 N-24A N-24A D-24
ADM235L ADM235LJN +70°C ADM235LAN -40°C +85°C ADM235LAQ -40°C +85°C
ADM236L ADM236LJN ADM236LJR ADM236LAN ADM236LAR ADM236LAQ ADM239L ADM239LJN ADM239LJR ADM239LAN ADM239LAR ADM239LAQ
+70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C +70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C
N-24 R-24 N-24 R-24 Q-24 N-24 R-24 N-24 R-24 Q-24
ADM238L ADM238LJN ADM238LJR ADM238LAN ADM238LAR ADM238LAQ
+70°C +70°C 40°C +85°C -40°C +85°C -40°C +85°C
N-24 R-24 N-24 R-24 Q-24
Ceramic DIP; Plastic DIP; Cerdip; Small Outline (SOIC); Small Shrink Outline Package (SSOP).
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although ADM223/ADM230L-ADM241L features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
REV.
ADM223/ADM230L-ADM241L
INPUT
T3OUT T1OUT T2OUT T2IN T1IN
CONNECT
T4OUT T5IN
6.3V +10V VOLTAGE DOUBLER +10V -10V VOLTAGE INVERTER 6.3V
ADM230L
VIEW (Not Scale)
T5OUT T4IN T3IN
TTL/CMOS INPUTS*
T1IN T2IN
T1OUT T2OUT T3OUT T4OUT RS-232 OUTPUTS
T3IN T4IN
Figure ADM230L DIP/SOIC Configuration
T5IN
T5OUT
ADM230L
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT
Figure ADM230L Typical Operating Circuit
T2OUT R2IN R2OUT T2IN
ADM231L
VIEW (Not Scale)
T1OUT R1IN R1OUT T1IN
+12V -12V VOLTAGE CONVERTER +7.5V 13.2V INPUT
SOIC
T1IN
T2OUT R2IN R2OUT T2IN
CONNECT
T1OUT
TTL/CMOS INPUTS* T2IN
T1OUT T2OUT R1IN
RS-232 OUTPUTS
R1OUT TTL/CMOS OUTPUTS R2OUT
ADM231L
VIEW (Not Scale)
RS-232 INPUTS** R2IN
R1IN R1OUT T1IN
ADM231L
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
Figure ADM231L Typical Operating Circuit (DIP Pinout) Figure ADM231L SOIC Configurations
REV.
ADM223/ADM230L-ADM241L
INPUT
T2OUT R2IN
T1OUT R1IN R1OUT T1IN T2IN R2OUT
6.3V
+10V VOLTAGE DOUBLER
6.3V
6.3V
+10V -10V VOLTAGE INVERTER
ADM232L
VIEW (Not Scale)
T1IN TTL/CMOS INPUTS* T2IN
T1OUT T2OUT R1IN
RS-232 OUTPUTS
R1OUT TTL/CMOS OUTPUTS R2OUT
RS-232 INPUTS** R2IN
ADM232L
Figure ADM232L DIP/SOIC Configuration
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
Figure ADM232L Typical Operating Circuit
INPUT
T2IN T1IN R1OUT R1IN T1OUT
R2OUT R2IN T2OUT
T1IN TTL/CMOS INPUTS* T2IN
T1OUT T2OUT R1IN
RS-232 OUTPUTS
R1OUT TTL/CMOS OUTPUTS R2OUT MAKE CONNECTIONS THESE PINS INTERNAL -10V POWER SUPPLY INTERNAL +10V POWER SUPPLY
ADM233L
VIEW (Not Scale)
RS-232 INPUTS** R2IN
ADM233L
Figure ADM233L Configuration
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
Figure ADM233L Typical Operating Circuit
REV.
ADM223/ADM230L-ADM241L
INPUT 6.3V +10V VOLTAGE DOUBLER +10V -10V VOLTAGE INVERTER 6.3V
T1OUT T2OUT T2IN T1IN
T3OUT T4OUT T4IN T3IN
T4IN TTL/CMOS INPUTS* T2IN
ADM234L
VIEW (Not Scale)
T1IN
T1OUT T2OUT RS-232 OUTPUTS T3OUT T4OUT
T3IN
ADM234L
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT
Figure ADM234L DIP/SOIC Configuration
Figure ADM234L Typical Operating Circuit
INPUT T1IN T1OUT T2OUT T3OUT T4OUT RS-232 OUTPUTS
T4OUT T3OUT T1OUT T2OUT R2IN R2OUT T2IN T1IN R1OUT
R3IN R3OUT T5IN
TTL/CMOS INPUTS*
T2IN T3IN T4IN
ADM235L
VIEW (Not Scale)
T5IN
T5OUT R1IN R2IN R3IN R4IN RS-232 INPUTS**
T5OUT R4IN R4OUT T4IN T3IN R5OUT R5IN
TTL/CMOS OUTPUTS R1OUT R2OUT R3OUT R4OUT
R1IN
R5OUT
R5IN
ADM235L
Figure ADM235L Configuration
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
Figure ADM235L Typical Operating Circuit
REV.
ADM223/ADM230L-ADM241L
INPUT 6.3V +10V VOLTAGE DOUBLER +10V -10V VOLTAGE INVERTER 6.3V
T3OUT T1OUT T2OUT R1IN R1OUT T2IN T1IN
T4OUT
R2IN R2OUT
T1OUT T2OUT RS-232 OUTPUTS
T4IN
TTL/CMOS INPUTS*
T1IN T2IN T3IN T4IN R1OUT TTL/CMOS OUTPUTS R2OUT
ADM236L
VIEW (Not Scale)
T3OUT T4OUT R1IN R2IN RS-232 INPUTS**
T3IN R3OUT
R3IN
R3OUT
R3IN
ADM236L
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
Figure ADM236L DIP/SOIC Configuration Figure ADM236L Typical Operating Circuit
INPUT
6.3V
+10V VOLTAGE DOUBLER +10V -10V VOLTAGE INVERTER
6.3V
T3OUT T1OUT T2OUT R1IN R1OUT T2IN T1IN
T4OUT
R2IN R2OUT T5IN T5OUT T4IN
TTL/CMOS INPUTS* T2IN T3IN T4IN T1IN
T1OUT T2OUT RS-232 OUTPUTS
ADM237L
VIEW (Not Scale)
T3OUT T4OUT T5OUT R1IN R2IN
T3IN R3OUT
T5IN R1OUT TTL/CMOS OUTPUTS R2OUT
R3IN
RS-232 INPUTS**
R3OUT
R3IN
ADM237L
Figure ADM237L DIP/SOIC Configuration
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
Figure ADM237L Typical Operating Circuit
REV.
ADM223/ADM230L-ADM241L
INPUT 6.3V +10V VOLTAGE DOUBLER +10V -10V VOLTAGE INVERTER 6.3V
T2OUT T1OUT R2IN R2OUT T1IN R1OUT R1IN
T3OUT
R3IN R3OUT
T1OUT T2OUT RS-232 OUTPUTS
T1IN
T4IN T4OUT T3IN
TTL/CMOS INPUTS* T2IN T3IN T4IN R1OUT R2OUT
ADM238L
VIEW (Not Scale)
T3OUT T4OUT R1IN R2IN RS-232 INPUTS**
T2IN R4OUT
R4IN
TTL/CMOS OUTPUTS
R3OUT R4OUT
R3IN R4IN
ADM238L
Figure ADM238L DIP/SOIC Configuration
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
Figure ADM238L Typical Operating Circuit
INPUT T1IN TTL/CMOS INPUTS* T2IN T3IN R1OUT R2OUT TTL/CMOS OUTPUTS T1OUT T2OUT RS-232 OUTPUTS +7.5V +13.2V INPUT
R1OUT R1IN R5IN R5OUT R4OUT
T1IN
+12V -12V VOLTAGE INVERTER
T2IN R2OUT R2IN T2OUT T1OUT R3IN R3OUT T3IN
ADM239L
VIEW (Not Scale)
T3OUT R1IN R2IN RS-232 INPUTS**
T3OUT
R3OUT R4OUT
R3IN R4IN
R4IN CONNECT
R5OUT
R5IN
ADM239L
Figure ADM239L DIP/SOIC Configuration
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
Figure ADM239L Typical Operating Circuit
REV.
ADM223/ADM230L-ADM241L
INPUT +10V VOLTAGE DOUBLER +10V -10V VOLTAGE INVERTER 6.3V
T3OUT T1OUT T2OUT R2IN R2OUT T2IN T1IN R1OUT R1IN
T4OUT R3IN R3OUT
T1IN T2IN T3IN
R4IN
TTL/CMOS INPUTS*
T1OUT T2OUT RS-232 OUTPUTS
ADM241L
VIEW (Not Scale)
R4OUT T4IN T3IN R5OUT
T4IN R1OUT R2OUT TTL/CMOS OUTPUTS
T3OUT T4OUT R1IN R2IN RS-232 INPUTS**
R5IN
R3OUT R4OUT R3IN R4IN
R5OUT
R5IN
ADM241L
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
Figure ADM241L SOIC/SSOP Configuration Figure ADM241L Typical Operating Circuit
INPUT
T3OUT T1OUT T2OUT R2IN R2OUT T2IN T1IN R1OUT R1IN
T4OUT R3IN R3OUT
+10V VOLTAGE DOUBLER +10V -10V VOLTAGE INVERTER
6.3V
R4IN
TTL/CMOS INPUTS*
T1IN T2IN T3IN T4IN R1OUT R2OUT TTL/CMOS OUTPUTS
T1OUT T2OUT RS-232 OUTPUTS
ADM223
VIEW (Not Scale)
R4OUT T4IN T3IN R5OUT
T3OUT T4OUT R1IN R2IN RS-232 INPUTS**
R5IN
R3OUT R4OUT R3IN R4IN
R5OUT
R5IN
ADM223
*INTERNAL 400k PULL-UP RESISTOR EACH TTL/CMOS INPUT **INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT NOTE: RECEIVERS REMAIN ACTIVE SHUTDOWN.
Figure ADM223 SOIC/SSOP Configuration Figure ADM223 Typical Operating Circuit
REV.
ADM223/ADM230L-ADM241L
FUNCTION DESCRIPTION
Mnemonic
Function Power Supply Input ADM233L, ADM235L). Internally generated positive supply (+10 nominal) parts except ADM231L ADM239L. ADM231L, ADM239L requires external 13.2 supply. Internally generated negative supply (-10 nominal). Ground pin. Must connected (ADM231L ADM239L only). External capacitor terminal) connected this pin. (ADM231L ADM239L only). External capacitor terminal) connected this pin. (ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor terminal) connected this pin. (ADM233L) capacitor connected internally external connection this required. (ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor terminal) connected this pin. (ADM233L) capacitor connected internally external connection this required. (ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor terminal) connected this pin. (ADM233L) Internal capacitor connections, Pins must connected together. (ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor terminal) connected this pin. (ADM233L) Internal capacitor connections, Pins must connected together. Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. internal pull-up resistor connected each input. Transmitter (Driver) Outputs. These RS-232 levels (typically Receiver Inputs. These inputs accept RS-232 signal levels. internal pull-down resistor connected each input. Receiver Outputs. These TTL/CMOS levels. Enable Input. Active ADM235L, ADM236L, ADM239L, ADM241L. Active high ADM223. This input used enable/disable receiver outputs. With high ADM223), receiver outputs enabled. With high ADM223), outputs placed high impedance state. This facility useful connecting microprocessor systems. Shutdown Input. Active high ADM235L, ADM236L, ADM241L. Active ADM223. With high ADM235L, ADM236L, ADM241L, charge pump disabled, receiver outputs placed high impedance state driver outputs turned off. With ADM223, charge pump disabled, driver outputs turned receivers except placed high impedance state. shutdown, power consumption reduces Connect. connections required this pin.
TOUT ROUT EN/EN
SD/SD
Table ADM235L, ADM236L, ADM241L Truth Table
Table ADM223 Truth Table
Status Normal Operation Normal Operation Shutdown
Transmitters T1-T5 Enabled Enabled Disabled
Receivers R1-R5 Enabled Disabled Disabled
Status Shutdown Shutdown Normal Operation Normal Operation
Transmitters Receivers T1-T4 R1-R3 Disabled Disabled Enabled Enabled Disabled Disabled Disabled Enabled Disabled Enabled Disabled Enabled
-10-
REV.
ADM223/ADM230L-ADM241L
VOUT LOADED)
VOUT
VOUT
VOUT (ALL O/Ps LOADED)
IOUT
Figure Charge Pump Current
Figure Transmitter Output Voltage
TOUT HIGH
SLEW RATE V/µs
TOUT
TOUT
1000 1500 2000 2500
CAPACITIVE LOAD
IOUT
Figure Transmitter Slew Rate Load Capacitance
Figure Transmitter Output Voltage Current
(UNLOADED)
IMPEDANCE
(LOADED)
(UNLOADED) (LOADED)
Figure Charge Pump Impedance
REV.
-11-
ADM223/ADM230L-ADM241L
Figure Charge Pump, Exiting Shutdown
Figure Transmitter Output Loaded Slew Rate
Figure Transmitter Output Unloaded Slew Rate
GENERAL INFORMATION
CIRCUIT DESCRIPTION
ADM223/ADM230L-ADM241L family RS-232 drivers/ receivers designed solve interface problems meeting EIA-232-E specifications while using single digital supply. EIA-232-E standard requires transmitters which will deliver minimum transmission channel receivers which accept signal levels down ADM223/ADM230L-ADM241L meet these requirements integrating step voltage converters level shifting transmitters receivers onto same chip. CMOS technology used keep power dissipation absolute minimum. comprehensive range transmitter/receiver combinations available cover most communications needs. ADM223, ADM230L, ADM235L, ADM236L ADM241L particularly useful battery powered systems they feature power shutdown mode which reduces power dissipation less than ADM233L ADM235L designed applications where space saving important charge pump capacitors molded into package. ADM231L ADM239L include only negative charge pump converter intended applications where positive available. facilitate sharing common line connection microprocessor data ADM235L, ADM236L, ADM239L ADM241L feature enable (EN, function. When disabled, receiver outputs placed high impedance state.
internal circuitry ADM230L-ADM241L consists three main sections. These are: charge pump voltage converter RS-232 TTL/CMOS receivers TTL/CMOS RS-232 transmitters
Charge Pump DC-DC Voltage Converter
charge pump voltage converter consists oscillator switching matrix. converter generates supply from input level. This done stages using switched capacitor technique illustrated Figures First, input supply doubled using capacitor charge storage element. level then inverted generate using storage element.
2VCC
INTERNAL OSCILLATOR
Figure Charge-Pump Voltage Doubler
-12-
REV.
ADM223/ADM230L-ADM241L
FROM VOLTAGE DOUBLER (V+)
INTERNAL OSCILLATOR
Figure Charge-Pump Voltage Inverter
Capacitors used reduce output ripple. Their values critical reduced higher levels ripple acceptable. charge pump capacitors also reduced expense higher output impedance supplies. supplies also used power external circuitry current requirements small.
Transmitter (Driver) Section
Enable Input ADM235, ADM239, ADM241L ADM223 feature enable input used enable disable receiver outputs. enable input active ADM235L, ADM239L, ADM241L active high ADM223. Refer Tables When disabled, receiver outputs placed high impedance state. This function allows outputs connected directly microprocessor data bus. also used allow receivers from different devices share common data line. timing diagram enable function shown Figure
3.5V ROUT 0.8V TDIS 0.1V VVOL 0.1V
drivers convert TTL/CMOS input levels into EIA-232-E output levels. With driving typical EIA-232-E load, output voltage swing Even under worst case conditions drivers guaranteed meet EIA-232-E minimum requirement. input threshold levels both CMOS compatible with switching threshold VCC/4. With nominal switching threshold 1.25 typical. Unused inputs left unconnected, internal pull-up resistor pulls them high forcing outputs into state. required EIA-232-E standard, slew rate limited less than V/µs without need external slew limiting capacitor output impedance power-off state greater than
Receiver Section
*POLARITY REVERSED ADM223.
Figure Enable Timing
APPLICATION HINTS Driving Long Cables
accordance with EIA-232-E standard, long cables permissible provided that total load capacitance does exceed 2500 longer cables which exceed this, then possible trade baud rate cable length. Large load capacitances cause reduction slew rate, hence maximum transmission baud rate decreased. ADM230L-ADM241L designed that slew rate reduction with increasing load capacitance minimized. receivers, important that high level noise immunity inbuilt that slow rise fall times cause multiple output transitions signal passes slowly through transition region. ADM230L-ADM241L have hysteresis guard against this. This ensures that, even noisy environments, error-free reception achieved.
High Baud Rate Operation
receivers inverting level shifters which accept EIA232-E input levels translate them into TTL/CMOS levels. inputs have internal pull-down resistors ground also protected against overvoltages guaranteed switching thresholds minimum maximum which well within EIA-232-E requirement. level threshold deliberately positive ensures that unconnected input will interpreted level. receivers have Schmitt trigger inputs with hysteresis level This ensures error-free reception both noisy inputs inputs with slow transition times.
Shutdown (SD)
ADM230L-ADM241L feature high slew rates permitting data transmission rates well excess EIA-232-E specification. drivers maintain signal levels data rates 100-kB/s under worst-case loading conditions.
ADM223, ADM230L, ADM235L, ADM236L ADM241L feature control input that used disable part reduce power consumption less than This very useful battery operated systems. During shutdown charge pump turned off, transmitters disabled receivers except ADM223 into high-impedance disabled state. Receivers ADM223 remain enabled during shutdown. This feature allows monitoring external activity such ring indicator monitoring while device power shutdown mode. shutdown control input active high parts except ADM223 where active low. Refer Tables
REV.
-13-
ADM223/ADM230L-ADM241L
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
14-Lead Plastic (N-14)
0.795 (20.19) 0.725 (18.42) 0.210 (5.33) 0.200 (5.05) 0.125 (3.18) 0.022 (0.558) 0.014 (0.356) 0.100 (2.54) 0.070 (1.77) 0.045 (1.15) 0.060 (1.52) 0.015 (0.38)
14-Lead Cerdip (Q-14)
0.780 (19.81) 0.300 (7.62) 0.163 (4.14) 0.133 (3.378) 0.271 (6.89) 0.240 (6.09)
0.280 (7.11) 0.240 (6.10)
0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93)
0.150 (3.81)
0.015 (0.381) 0.008 (0.204)
0.125 (3.17) 0.02 (0.5) 0.016 (0.406) 0.11 (2.79) 0.099 (2.28) 0.06 (1.52) 0.05 (1.27)
0.21 (5.33) 0.15 (3.81)
0.012 (0.305) 0.008 (0.203)
SEATING PLANE
SEATING PLANE
16-Lead Plastic (N-16) 16-Lead Cerdip (Q-16)
0.840 (21.33) 0.745 (18.93) 0.210 (5.33) 0.200 (5.05) 0.125 (3.18) 0.060 (1.52) 0.015 (0.38) 0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93) 0.280 (7.11) 0.240 (6.10)
0.780 (19.81) 0.163 (4.14) 0.133 (3.378) 0.300 (7.62) 0.271 (6.89) 0.240 (6.09)
0.150 (3.81)
0.015 (0.381) 0.008 (0.204)
0.125 (3.17) 0.02 (0.5) 0.016 (0.406) 0.11 (2.79) 0.099 (2.28) 0.06 (1.52) 0.05 (1.27)
0.21 (5.33) 0.15 (3.81)
0.012 (0.305) 0.008 (0.203)
0.022 (0.558) 0.014 (0.356)
0.100 (2.54)
0.070 (1.77) 0.045 (1.15)
SEATING PLANE
SEATING PLANE
16-Lead SOIC (R-16)
0.299 (7.60) 0.291 (7.40) 0.419 (10.65) 0.404 (10.26)
0.413 (10.50) 0.348 (10.10)
0.107 (2.72) 0.089 (2.26)
0.364 (9.246) 0.344 (8.738)
0.010 (0.25) 0.004 (0.10)
0.050 (1.27)
0.018 (0.46) 0.014 (0.36)
0.015 (0.38) 0.007 (1.18)
0.045 (1.15) 0.020 (0.50)
-14-
REV.
ADM223/ADM230L-ADM241L
20-Lead Plastic (N-20)
0.280 (7.11) 0.240 (6.10)
0.97 (24.64) 0.935 (23.75) 0.32 (8.128) 0.29 (7.366) 0.18 (4.57) 0.125 (3.18) 0.011 (0.28) 0.009 (0.23) SEATING PLANE
20-Lead Cerdip (Q-20)
0.28 (7.11) 0.24 (6.1)
1.060 (26.90) 0.925 (23.50) 0.210 (5.33) 0.200 (5.05) 0.125 (3.18) 0.022 (0.558) 0.014 (0.356) 0.100 (2.54) 0.070 (1.78) 0.045 (1.15) 0.060 (1.52) 0.015 (0.38) 0.150 (3.81)
0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204)
0.20 (5.0) 0.14 (3.56) 0.15 (3.8) 0.125 (3.18) 0.02 (0.5) 0.016 (0.41)
SEATING PLANE
0.11 (2.79) 0.09 (2.28)
0.07 (1.78) 0.05 (1.27)
LEAD IDENTIFIED NOTCH
20-Lead SOIC (R-20)
0.005 (0.13)
24-Lead Ceramic (D-24)
0.098 (2.49)
0.2992 (7.60) 0.2914 (7.40)
0.610 (15.49) 0.500 (12.70) 1.290 (32.77) 0.075 (1.91) 0.015 (0.38) 0.620 (15.75) 0.590 (14.99)
0.4193 (10.65) 0.3937 (10.00)
0.5118 (13.00) 0.4961 (12.60)
0.1043 (2.65) 0.0926 (2.35)
0.225 (5.72)
0.0291 (0.74) 0.0098 (0.25)
0.200 (5.08) 0.120 (3.05) 0.023 (0.58) 0.014 (0.36) 0.110 (2.79) 0.090 (2.29) 0.070 (1.78) 0.030 (0.76)
0.150 (3.81)
0.015 (0.38) 0.008 (0.20)
0.0118 (0.30) 0.0040 (0.10)
0.0500 (1.27)
0.0192 (0.49) 0.0138 (0.35)
0.0125 (0.32) 0.0091 (0.23)
0.0500 (1.27) 0.0157 (0.40)
SEATING PLANE
24-Lead Plastic (N-24)
1.228 (31.19) 1.226 (31.14) 0.130 (3.30) 0.128 (3.25) 0.260 0.001 (6.61 0.03)
24-Lead Plastic (N-24A)
0.55 (13.97) 0.53 (13.47) 1.25 (31.75) 1.24 (31.5) (5.08) 0.175 (4.45) 0.12 (3.05) 0.02 (0.508) 0.015 (0.381) 0.16 (4.07) 0.14 (3.56) 0.606 (15.4) 0.594 (15.09)
0.32 (8.128) 0.30 (7.62)
SEATING PLANE 0.02 (0.5) 0.016 (0.41) 0.11 (2.79) 0.09 (2.28) 0.07 (1.78) 0.05 (1.27)
0.011 (0.28) 0.009 (0.23)
0.105 (2.67) 0.095 (2.42)
0.065 (1.66) 0.045 (1.15)
SEATING PLANE
0.012 (0.305) 0.008 (0.203)
NOTES LEAD IDENTIFIED NOTCH PLASTIC LEADS WILL EITHER SOLDER DIPPED PLATED ACCORDANCE WITH MIL-M-38510 REQUIREMENTS.
REV.
-15-
24-Lead Cerdip (Q-24)
1.290 (32.77) 0.225 (5.715) 0.125 (3.175) 0.180 (4.572) SEATING PLANE 0.070 (1.778) 0.021 (0.533) 0.110 (2.794) 0.065 (1.651) 0.020 (0.508) 0.015 (0.381) 0.090 (2.286) 0.055 (1.397) LEAD IDENTIFIED NOTCH. CERDIP LEADS WILL EITHER PLATED SOLDER DIPPED ACCORDANCE WITH MIL-M-38510 REQUIREMENTS. 0.012 (0.305) 0.008 (0.203) 0.320 (8.128) 0.290 (7.366) 0.295 (7.493)
28-Lead SOIC (R-28)
0.299 (7.6) 0.291 (7.39)
0.708 (18.02) 0.696 (17.67)
0.096 (2.44) 0.089 (2.26) 0.03 (0.76) 0.02 (0.51)
0.01 (0.254) 0.006 (0.15)
0.05 (1.27)
0.019 (0.49) 0.014 (0.35)
0.013 (0.32) 0.009 (0.23)
0.042 (1.067) 0.018 (0.457)
LEAD IDENTIFIED DOT. SOICLEADS WILL EITHER PLATED SOLDER DIPPED ACCORDANCE WITH MIL-M-38510 REQUIREMENTS.
24-Lead SOIC (R-24)
28-Lead SSOP (RS-28)
0.299 (7.6) 0.291 (7.39) 0.414 (10.52) 0.398 (10.10)
0.212 (5.38) 0.205 (5.207) 0.311 (7.9) 0.301 (7.64)
0.608 (15.45) 0.596 (15.13)
0.096 (2.44) 0.089 (2.26)
0.03 (0.76) 0.02 (0.51)
0.407 (10.34) 0.397 (10.08)
0.07 (1.78) 0.066 (1.67)
0.01 (0.254) 0.006 (0.15)
0.05 (1.27)
0.019 (0.49) 0.014 (0.35)
0.013 (0.32) 0.009 (0.23)
0.042 (1.067) 0.018 (0.447)
0.008 (0.203) 0.002 (0.050)
0.0256 (0.65)
0.009 (0.229) 0.005 (0.127)
0.037 (0.94) 0.022 (0.559)
LEAD IDENTIFIED DOT. SOIC LEADS WILL EITHER PLATED SOLDER DIPPED ACCORDANCE WITH MIL-M-38510 REQUIREMENTS
LEAD IDENTIFIED DOT. LEADS WILL EITHER PLATED SOLDER DIPPED ACCORDANCE WITH MIL-M-38510 REQUIREMENTS
-16-
PRINTED U.S.A.
C1900-18-4/94
0.414 (10.52) 0.398 (10.10)

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