LTC1324 single line transceiver designed operate Apple®LocalTalk netwo
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LTC1324 Single Supply LocalTalk® Transceiver
LTC1324 single line transceiver designed operate Apple®LocalTalk networks. driver features digitally selectable slew rate mode reduced emissions. chip draws only quiescent current when active shutdown. differential driver outputs three-state when disabled, during shutdown when power off. driver outputs will maintain high impedance even with output common mode voltages beyond power supply rails. Both driver outputs receiver inputs protected against damage ±10kV. LTC1324 available 16-pin Wide package.
registered trademarks Linear Technology Corporation. Apple LocalTalk registered trademarks Apple Computer, Inc.
Single Chip LocalTalk Port Power: Shutdown Reduces Digitally Selectable Slew Rate Mode Reduced Emmisions Drivers Maintain High Impedance Three-State with Power Thermal Shutdown Protection Drivers Short-Circuit Protected
APPLICATIONS
LocalTalk Peripherals Notebook Palmtop Computers Battery-Powered Systems
TYPICAL APPLICATION
Typical LocalTalk Connection
SLEW RATE CONTROL DATA ENABLE SHUTDOWN ENABLE DATA
1324 TA01
Waveform Driver
LocalTalk TRANSFORMER
5V/DIV
LTC1324
DOUT 1V/DIV
TIME (0.5µs/DIV)
1324 TA02
LTC1324
ABSOLUTE MAXIMUM RATINGS
(Note
PACKAGE/ORDER INFORMATION
VIEW TXDEN SHDN RXEN PACKAGE 16-LEAD PDIP
Supply Voltage (VCC) Input Voltage (Logic Inputs) 0.3V (VCC 0.3V) Input Voltage (Receiver Inputs) Driver Output Voltage (Forced) ±15V Driver Short-Circuit Duration Indefinite Operating Temperature Range 70°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
TXDEN RXEN
ORDER PART NUMBER LTC1324CN LTC1324CSW
PACKAGE 16-LEAD PLASTIC WIDE
TJMAX 150°C, 110°C/ TJMAX 150°C, 150°C/ (SW)
Consult factory Industrial Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Supplies Normal Operation Supply Current Shutdown Supply Current
70°C (Notes unless otherwise noted.
UNITS
CONDITIONS
Load, SHDN TXDEN RXEN Load, SHDN
±4.0 ±2.0
Differential Driver Differential Output Voltage Change Magnitude Differential Output Voltage Differential Common Mode Output Voltage Short-Circuit Current Three-State Output Current Load (Figure (Figure (Figure (TXDEN TXDEN GND) SHDN Power Off,
±200
Logic Inputs Receiver Input Resistance Receiver Threshold Voltage Receiver Input Hysteresis Output High Voltage Output Voltage Output Short-Circuit Current Output Three-State Current RXEN VCC, RXEN
Input High Voltage Input Voltage Input Current Pull-Down Current
Logic Input Pins Logic Input Pins SHDN, TXDEN, RXDEN, RXDEN, TXDEN,
±100
LTC1324
ELECTRICAL CHARACTERISTICS
SYMBOL tPLH, tPHL PARAMETER Driver Propagation Delay Without Slew Rate Control Driver Propagation Delay with Slew Rate Control Receiver Propagation Delay tSKEW Driver Output Output Without Slew Rate Control Driver Output Output with Slew Rate Control Driver Rise/Fall Time Without Slew Rate Control Driver Rise/Fall Time with Slew Rate Control Hdis, Ldis Driver Output Active Disable Without Slew Rate Control Driver Output Active Disable with Slew Rate Control Receiver Output Active Disable ENH, Driver Enable Output Active Without Slew Rate Control Driver Enable Output Active with Slew Rate Control Receiver Enable Output Active Switching Characteristics
70°C (Notes unless otherwise noted.
CONDITIONS 100, 100pF (Figures 100, 100pF (Figures 15pF (Figures 100, 100pF (Figures 100, 100pF (Figures 100, 100pF (Figures 2,4) 100, 100pF (Figures 15pF (Figures 15pF (Figures 15pF (Figures 15pF (Figures 15pF (Figures 15pF (Figures
UNITS
denotes specifications which apply over full operating temperature range. Note Absolute Maximum Ratings those values beyond which life device impaired.
Note currents into device pins positive currents device pins negative. voltages reference ground unless otherwise specified. Note typicals given 25°C.
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Differential Output Voltage Output Current
OUTPUT CURRENT (mA)
25°C
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
1324
Driver Output Voltage Output Current
25°C -105
Driver Output High Voltage Output Current
25°C
OUTPUT VOLTAGE
1324
DRIVER OUTPUT HIGH VOLTAGE
1324
LTC1324 TYPICAL PERFORMANCE CHARACTERISTICS
Receiver Output Voltage Output Current
25°C
OUTPUT CURRENT (mA) OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE
Receiver Short-Circuit Current Temperature
SUPPLY CURRENT (µA)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
1324
TEMPERATURE (°C)
1324
TIME (ns)
Receiver Output Voltage Temperature
OUTPUT VOLTAGE
TEMPERATURE (°C)
1324
OUTPUT VOLTAGE
1324
Receiver Output High Voltage Output Current
Driver Short-Circuit Current Temperature
25°C
OUTPUT VOLTAGE
1324
TEMPERATURE (°C)
1324
Supply Current (Driver Receiver Enabled) Temperature
Driver Skew Temperature
TEMPERATURE (°C)
1324
Receiver Output High Voltage Temperature
4.00 3.75 3.50 3.25 3.00 2.75 2.50 2.25 2.00 TEMPERATURE (°C)
1324
LTC1324 TYPICAL PERFORMANCE CHARACTERISTICS
Driver Differential Output Voltage Temperature
DIFFERENTIAL VOLTAGE
TEMPERATURE (°C)
1324
TIME (ns)
FUNCTIONS
(Pins 13): Internal Connection. (Pin Slew Rate Control (TTL Compatible). high level this forces RS485 driver into slew rate mode. level forces driver into high slew rate normal mode. Connected internal pull-down. (Pin RS485 Driver Input (TTL Compatible). TXDEN (Pin Driver Output Enable (TTL Compatible). high level this level TXDEN (Pin forces RS485 driver into three-state. level enables driver. SHDN (Pin Shutdown Input (TTL Compatible). When this high, chip shut down; driver receiver outputs three-state; supply current drops 1µA. level this allows normal operation. RXEN (Pin Receiver Enable (TTL Compatible). high level this level RXEN (Pin disables receiver three-states logic outputs. level allows normal operation. RXDO (Pin RS485 Receiver Output. (Pin Ground. (Pin RS485 Receiver Noninverting Input. When this 200mV above RXDO will high. When this 200mV below RXDO will low. (Pin 10): RS485 Receiver Inverting Input. (Pin 11): RS485 Driver Noninverting Output. (Pin 12): RS485 Driver Inverting Output. RXEN (Pin 14): Receiver Enable (TTL Compatible). level this high level RXEN (Pin disables receiver three-states logic outputs. high level allows normal operation. Connected internal pulldown. TXDEN (Pin 15): Driver Output Enable (TTL Compatible). level this high level TXDEN (Pin forces RS485 driver into three-state. high level enables driver. Connected internal pull-down. (Pin 16): Positive Supply Input. 4.75V 5.25V. Requires bypass capacitor ground.
Receiver Temperature
TEMPERATURE (°C)
1324
LTC1324
TEST CIRCUITS
1324
RXDO
15pF
OUTPUT
1324
1324
Figure
Figure
Figure
SWITCHING WAVEFORMS
tSKEW tSKEW
1324
TXDEN
1324
(RXD (RXD tPLH RXDO
1.5V
1MHz: 10ns: 10ns
1.5V tPHL
VDIFF V(TXD+) V(TXD
Figure Differential Driver
1.5V
1MHz: 10ns: 10ns
1.5V
2.3V OUTPUT NORMALLY OUTPUT NORMALLY HIGH 2.3V 0.5V 0.5V
Figure Differential Driver Enable Disable
1MHz: 10ns: 10ns
tPHL
1.5V
1.5V
1324
Figure Differential Receiver
LTC1324
SWITCHING WAVEFORMS
RXEN RXO, RXO, RXDO RXO, RXO, RXDO
1324
APPLICATIONS INFORMATION
Thermal Shutdown Protection LTC1324 includes thermal shutdown circuit which protects against prolonged shorts driver outputs. driver output shorted another output, ground power supply, current will initially limited maximum 250mA. When temperature rises above 150°C, thermal shutdown circuit turns driver outputs. When cools about 130°C, outputs turn short still exists, part will heat again cycle will repeat. This oscillation occurs about 10Hz prevents part from being damaged excessive power dissipation. When short removed, part will return normal operation. Power Shutdown power shutdown feature LTC1324 designed battery-powered systems. When SHDN forced high, part enters shutdown mode. shutdown, supply current typically drops from driver receiver outputs three-stated. Supply Bypassing LTC1324 requires bypassed prevent data errors. capacitor from ground adequate. Filters Slew Rate Control Most LocalTalk applications need electromagnetic interference (EMI) filter consisting resistorFERRITE BEAD FERRITE BEAD
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
1.5V
1MHz: 10ns: 10ns
1.5V
2.3V OUTPUT NORMALLY OUTPUT NORMALLY HIGH 2.3V 0.5V 0.5V
Figure Receiver Enable Disable
capacitor network between each driver, receiver connector. Unfortunately, resistors will attenuate driver's output signal applied cable. Because LTC1324 uses single supply, resistors' values should reduced ensure enough voltage swing cable (Figure Another maximum swing immunity ferrite bead capacitor network (Figure data rates below 250kbps, LTC1324 features mode which limits rise time drivers 400ns. With lower rise time, network eliminated, allowing more signal voltage reach cable. Figures show output signals driver with different slew rates.
100pF 100pF
1324
Figure
100pF
1324
Figure
LTC1324
APPLICATIONS INFORMATION
1324
Figure High Slew Rate Mode
1324
Figure Slew Rate Mode
PACKAGE
0.300 0.325 (7.620 8.255)
0.130 0.005 (3.302 0.127) 0.015 (0.381)
0.009 0.015 (0.229 0.381)
+0.025 0.325 -0.015 +0.635 8.255 -0.381
0.125 (3.175)
0.100 0.010 (2.540 0.254)
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTURSIONS SHALL EXCEED 0.010 INCH (0.254mm).
0.005 (0.127)
0.291 0.299 (7.391 7.595) (NOTE 0.010 0.029 (0.254 0.737)
0.050 (1.270)
0.009 0.013 (0.229 0.330)
NOTE
0.016 0.050 (0.406 1.270) NOTE: IDENT, NOTCH CAVITIES BOTTOM PACKAGES MANUFACTURING OPTIONS. PART SUPPLIED WITH WITHOUT OPTIONS. THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.006 INCH (0.15mm).
RELATED PARTS
PART NUMBER LTC1318 LTC1320 LTC1323 DESCRIPTION Single Powered RS232/RS422 Transceiver RS422/RS562 Transceiver Single Powered RS422/RS562 Transceiver COMMENTS Selectable RS232/RS422 Receiver. Available 24-Pin Wide Package Available 18-Pin Wide Package Available 16-Pin 24-Pin Wide Packages
LT/GP 0596 PRINTED
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
Dimensions inches (millimeters) unless otherwise noted. Package 16-Lead PDIP (Narrow 0.300)
(LTC 05-08-1510)
0.045 0.065 (1.143 1.651) 0.770* (19.558)
0.065 (1.651) 0.045 0.015 (1.143 0.381)
0.255 0.015* (6.477 0.381)
0.018 0.003 (0.457 0.076)
0694
Package 16-Lead Plastic Small Outline (Wide 0.300)
(LTC 05-08-1620)
0.093 0.104 (2.362 2.642) 0.037 0.045 (0.940 1.143)
0.398 0.413 (10.109 10.490) (NOTE
NOTE
0.394 0.419 (10.007 10.643)
0.004 0.012 (0.102 0.305)
0.014 0.019 (0.356 0.482)
SOL16 0392
LINEAR TECHNOLOGY CORPORATION 1995
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