Kbit (32Kb Voltage EPROM EPROM 2.7V 3.6V Supply Voltage Read Oper
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M27W256
Kbit (32Kb Voltage EPROM EPROM
2.7V 3.6V Supply Voltage Read Operation Access Time: 3.0V 3.6V 2.7V 3.6V Compatible with M27C256B Power Consumption: Max. Standby Current Max. Active Current Programming Time µs/byte High Reliability CMOS Technology 2,000V Protection Latchup Protection Immunity Electronic Signature Manufacturer Code: Device Code: ECOPACK® packages available
FDIP28W
PDIP28
PLCC32
TSOP28 13.4
April 2006
1/23
www.st.com
Contents
M27W256
Contents
Summary description Device description
2.10 Read mode Standby mode Two-line output control System considerations Programming Presto programming algorithm Program Inhibit Program Verify Electronic Signature Erasure operation (applies EPROM)
Maximum ratings parameters Package mechanical data
28-pin Ceramic Frit-seal DIP, with window (FDIP28WB) 28-pin Plastic DIP, mils width (PDIP28) 32-lead Rectangular Plastic Leaded Chip Carrier (PLCC32)
Part numbering Revision history
28-lead Plastic Thin Small Outline, 13.4 (TSOP28)
2/23
M27W256
List tables
List tables
Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Signal descriptions Operating modes Electronic Signature Absolute Maximum Ratings Read Mode Characteristics Programming Mode Characteristics Measurement Conditions Capacitance Read Mode Characteristics Programming Mode Characteristics FDIP28WB package mechanical data PDIP28 package mechanical data PLCC32 package mechanical data TSOP28 package mechanical data Ordering Information Scheme. Document revision history
3/23
List figures
M27W256
List figures
Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Logic Diagram Connections Connections TSOP Connections Programming flowchart Testing Input Output Waveform Testing Load Circuit Read Mode Waveforms Programming Verify Modes Waveforms FDIP28WB package outline PDIP28 package outline PLCC32 package outline TSOP28 package outline
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M27W256
Summary description
Summary description
M27W256 voltage Kbit EPROM offered ranges (ultra violet erase) (one time programmable). ideally suited microprocessor systems organized 32,768 bits. M27W256 operates read mode with supply voltage decrease operating power allows either reduction size battery increase time between battery recharges. FDIP28W (window ceramic frit-seal package) transparent which allows user expose chip ultraviolet light erase pattern. pattern then written device following programming procedure. applications where content programmed only time erasure required, M27W256 offered PDIP28, PLCC32 TSOP28 13.4 packages. order meet environmental requirements, offers M27W256 ECOPACK® packages. ECOPACK packages Lead-free. category second Level Interconnect marked package inner label, compliance with JEDEC Standard JESD97. maximum ratings related soldering conditions also marked inner label. ECOPACK trademark. ECOPACK® specifications available www.st.com. Figure Logic Diagram Table Signal descriptions brief overview signals connected this device. Figure Logic Diagram
A0-A14
M27W256
Q0-Q7
AI03629
5/23
Summary description Table Signal descriptions
Signal A0-A14 Q0-Q7 Address Inputs Data Outputs Chip Enable Output Enable Program Supply Supply Voltage Ground Connected Internally Don't Description
M27W256
Figure
Connections
M27W256
AI03627
6/23
M27W256 Figure Connections
Summary description
M27W256
AI03626
Figure
TSOP Connections
AI03628
M27W256
7/23
Device description
M27W256
Device description
Table lists M27W256 operating modes. single power supply required Read mode. inputs levels except Electronic Signature. Table Operating modes
Mode Read Output Disable Program Verify Program Inhibit Standby Electronic Signature Pulse Q7-Q0 Data Hi-Z Data Data Hi-Z
Note:
VIL, 0.5V.
Read mode
Standby mode
M27W256 control functions, both which must logically active order obtain data outputs. Chip Enable power control should used device selection. Output Enable output control should used gate data output pins, independent device selection. Assuming that addresses stable, address access time (tAVQV) equal delay from output (tELQV). Data available output after delay tGLQV from falling edge assuming that been addresses have been stable least tAVQV-tGLQV.
Codes
Hi-Z
M27W256 standby mode which reduces supply current from 10mA 10µA with voltage operation 3.6V, Read Mode Characteristics table details. M27W256 placed standby mode applying CMOS high signal input. When standby mode, outputs high impedance state, independent input.
Two-line output control
Because EPROMs usually used larger memory arrays, this product features 2-line control function which accommodates multiple memory connection. line control function allows: lowest possible memory power dissipation, complete assurance that output contention will occur.
most efficient these control lines, should decoded used primary device selecting function, while should made common connection
8/23
M27W256
Device description devices array connected READ line from system control bus. This ensures that deselected memory devices their power standby mode output pins only active when data desired from particular memory device.
System considerations
power switching characteristics Advance CMOS EPROMs require careful decoupling devices. supply current, ICC, three segments that interest system designer: standby current level, active current level, transient current peaks that produced falling rising edges magnitude this transient current peaks dependent capacitive inductive loading device output. associated transient voltage peaks suppressed complying with line output control properly selected decoupling capacitors. recommended that 0.1µF ceramic capacitor used every device between VSS. This should high frequency capacitor inherent inductance should placed close device possible. addition, 4.7µF bulk electrolytic capacitor should used between every eight devices. bulk capacitor should located near power supply connection point. purpose bulk capacitor overcome voltage drop caused inductive effects traces.
Programming
Presto programming algorithm
M27W256 been designed fully compatible with M27C256B same electronic signature. result M27W256 programmed M27C256B same programming equipments applying 12.75V 6.25V same PRESTO algorithm. When delivered (and after each erasure EPROM), bits M27W256 state. Data introduced selectively programming '0's into desired locations. Although only '0's will programmed, both '1's '0's present data word. only change exposure ultraviolet light EPROM). M27W256 programming mode when input 12.75V, pulsed VIL. data programmed applied bits parallel data output pins. levels required address data inputs TTL. specified 6.25 0.25
Presto programming algorithm allows program whole array with guaranteed margin, typical time seconds. Programming with Presto involves application sequence 100µs program pulses each byte until correct verify occurs (see Figure During programming verify operation, Margin mode circuit automatically activated order guarantee that each cell programmed with enough margin. overprogram pulse applied since verify Margin mode much higher than 3.6V provides necessary margin each programmed cell.
9/23
Device description Figure Programming flowchart
6.25V, 12.75V
M27W256
100µs Pulse VERIFY Last Addr Addr
FAIL
CHECK WORDS 1st: 2nd: 2.7V
AI00707D
Program Inhibit
Programming multiple M27W256s parallel with different data also easily accomplished. Except like inputs including parallel M27W256 common. level pulse applied M27W256's input, with 12.75 will program that M27W256. high level input inhibits other M27W256s from being programmed.
Program Verify
verify (read) should performed programmed bits determine that they were correctly programmed. verify accomplished with VIL, VIH, 12.75V 6.25V.
Electronic Signature
Electronic Signature (ES) mode allows reading binary code from EPROM that will identify manufacturer type. This mode intended programming equipment automatically match device programmed with corresponding programming algorithm. mode functional 25°C ambient temperature range that required when programming M27W256. activate mode, programming equipment must force 11.5V 12.5V address line M27W256, with identifier bytes then sequenced from device outputs toggling address line from VIH. other address lines must held during Electronic Signature mode. Byte VIL) represents manufacturer code byte VIH) device identifier code. STMicroelectronics M27W256,
10/23
M27W256
Device description these identifier bytes given Table read-out outputs Note that M27W256 M27C256B have same identifier bytes. Table Electronic Signature
Data
Identifier Manufacturer's Code Device Code
2.10
Erasure operation (applies EPROM)
erasure characteristics M27W256 such that erasure begins when cells exposed light with wavelengths shorter than approximately 4000 should noted that sunlight some type fluorescent lamps have wavelengths 3000-4000 range. Research shows that constant exposure room level fluorescent lighting could erase typical M27W256 about years, while would take approximately week cause erasure when exposed direct sunlight. M27W256 exposed these types lighting conditions extended periods time, suggested that opaque labels over M27W256 window prevent unintentional erasure. recommended erasure procedure M27W256 exposure short wave ultraviolet light which wavelength integrated dose (i.e. intensity exposure time) erasure should minimum W-sec/cm2. erasure time with this dosage approximately minutes using ultraviolet lamp with 12000 µW/cm2 power rating. M27W256 should placed within inch) lamp tubes during erasure. Some lamps have filter their tubes which should removed before erasure.
11/23
Maximum ratings
M27W256
Maximum ratings
Table
Symbol TBIAS TSTG
Absolute Maximum Ratings
Parameter Ambient Operating Temperature Temperature Under Bias Storage Temperature Input Output Voltage (except Supply Voltage Voltage Program Supply Voltage Value 13.5 Unit
Except rating "Operating Temperature Range", stresses above those listed Table "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only operation device these other conditions above those indicated Operating sections this specification implied. Exposure Absolute Maximum Rating conditions extended periods affect device reliability. Refer also STMicroelectronics SURE Program other relevant quality documents. Depends range. Minimum voltage Input Output -0.5V with possible undershoot -2.0V period less than 20ns. Maximum voltage Output +0.5V with possible overshoot period less than 20ns.
12/23
M27W256
parameters
parameters
85°C; 2.7V 3.6V; Table
Symbol ICC1 ICC2
Read Mode Characteristics
Parameter Input Leakage Current Output Leakage Current Supply Current Supply Current (Standby) Supply Current (Standby) CMOS Program Current Input Voltage Input High Voltage Output Voltage Output High Voltage 2.1mA -400µA Test Condition VOUT VIL, VIL, IOUT 0mA, 5MHz, 3.6V 0.2V, 3.6V -0.6 Min. Max. Unit
0.7VCC
must applied simultaneously with before removed simultaneously after VPP. Maximum voltage Output +0.5V.
6.25V 0.25V; 12.75V 0.25V Table
Symbol
Programming Mode Characteristics
Parameter
Input Leakage Current Supply Current
Program Current Input Voltage Input High Voltage Output Voltage Output High Voltage Voltage
0.2VCC
Test Condition
Unit
-0.3 11.5
12.5
must applied simultaneously with before removed simultaneously after VPP.
13/23
parameters Table Measurement Conditions
Parameter Input Rise Fall Times Input Pulse Voltages Input Output Timing Ref. Voltages High Speed 10ns 1.5V
M27W256
Standard 20ns 0.4V 2.4V 0.8V
Table
Symbol COUT
Capacitance
Parameter Input Capacitance Output Capacitance Test Condition VOUT Min. Max. Unit
Sampled only, 100% tested.
Figure
Testing Input Output Waveform
High Speed
1.5V
Standard 2.4V
0.4V
Figure
Testing Load Circuit
1.3V
2.0V 0.8V
AI01822
1N914
3.3k DEVICE UNDER TEST
30pF High Speed 100pF Standard includes capacitance
AI01823B
14/23
M27W256 2.7V 3.6V; Table Read Mode Characteristics
Symbol Parameter Test Condition
3.0V 3.6V
parameters
-100 (-120/-150/-200)
2.7V 3.6V
2.7V 3.6V
Unit
Min. tAVQV tELQV tGLQV tEHQZ tGHQZ tAXQX tACC Address Valid Output Valid Chip Enable Output Valid Output Enable Output Valid Chip Enable High Output Hi-Z Output Enable High Output Hi-Z Address Transition Output Transition VIL, VIL,
Max.
Min.
Max.
Min.
Max.
must applied simultaneously with before removed simultaneously after VPP. Speed obtained with High Speed measurement conditions. Sampled only, 100% tested.
Figure
Read Mode Waveforms
A0-A14 VALID tAVQV
Q0-Q7
tGLQV
tAXQX
VALID
tEHQZ
tELQV
tGHQZ Hi-Z
AI00758B
15/23
parameters 6.25V 0.25V; 12.75V 0.25V Table
Symbol tAVPL tQVPL tVPHPL tVCHPL tELPL tPLPH tPHQX tQXGL tGLQV tGHQZ tGHAX
M27W256
Programming Mode Characteristics
tVPS tVCS tCES tOES tDFP Parameter Address Valid Program Input Valid Program High Program High Program Chip Enable Program Program Pulse Width Program High Input Transition Input Transition Output Enable Output Enable Output Valid Output Enable High Output Hi-Z Output Enable High Address Transition Test Condition Min. Max. Unit
must applied simultaneously with before removed simultaneously after VPP. Sampled only, 100% tested.
Figure
Programming Verify Modes Waveforms
A0-A14 tAVEL Q0-Q7 DATA tQVEL
tVPHEL
VALID tEHQX
DATA
tGLQV
tGHQZ
tVCHEL
tGHAX
tELEH
tQXGL
PROGRAM
VERIFY
AI00759
16/23
M27W256
Package mechanical data
Package mechanical data
28-pin Ceramic Frit-seal DIP, with window (FDIP28WB)
Figure FDIP28WB package outline
FDIPW-a
Table
Symbol
FDIP28WB package mechanical data
millimeters
0.51 3.91 3.89 0.41
0.23 36.50 13.06
1.40 4.57 4.50 0.56 0.30 37.34
5.72
inches
0.225 0.055 0.180 0.177 0.022
0.020 0.154 0.153
0.016 0.057 0.009 1.437 1.300 0.600
1.45
0.012 1.470
33.02 15.24 13.36 2.54 14.99 0.514
0.526 0.100 0.590
16.18 3.18 1.52 7.11
18.03 4.10 2.49
0.637 0.125 0.060 0.280
0.710 0.161 0.098
17/23
Package mechanical data
M27W256
28-pin Plastic DIP, mils width (PDIP28)
Figure PDIP28 package outline
PDIP
Table
Symbol
PDIP28 package mechanical data
millimeters 4.445 0.630 3.050 3.810 0.450 1.270 0.230 36.580 4.570 inches
12.700 14.800 15.200 1.78
36.830
33.020 15.240
0.1750
0.1799
0.0248
0.1201
0.1500 0.0177 0.0500
0.310
0.0091 1.4402 1.4500 1.3000 0.6000
0.0122 1.4598
37.080
13.720 2.540 15.000
14.480
0.5000
0.5402 0.1000
0.5701
15.200 16.680
0.5827 0.5984
0.5906
0.5984 0.6567
3.300 2.08 0.070
0.1299 0.082
18/23
M27W256
Package mechanical data
32-lead Rectangular Plastic Leaded Chip Carrier (PLCC32)
Figure PLCC32 package outline
0.51 (.020) 1.14 (.045)
Table
Symbol
PLCC32 package mechanical data
millimeters
3.18 1.53 0.38 0.33 0.66
12.32 11.35 4.78 14.86 13.89 6.05
7.62
2.41 0.53 0.81 0.10 12.57 11.51 5.66
3.56
inches
PLCC-A
0.140 0.095 0.021 0.032 0.004
0.125 0.060
0.015 0.013 0.026
0.485 0.447 0.188 0.300
0.495 0.453 0.223
15.11 14.05 6.93 10.16 1.27
0.585 0.547 0.238 0.400 0.050
0.595 0.553 0.273
0.00 0.89
0.13
0.000 0.035
0.005
19/23
Package mechanical data
M27W256
28-lead Plastic Thin Small Outline, 13.4 (TSOP28)
Figure TSOP28 package outline
TSOP-C
Table
Symbol
TSOP28 package mechanical data
millimeters
13.200 11.700 0.950 0.170 0.100
7.900 0.500
0.550
0.200 1.150 0.270 0.210 0.100 13.600 11.900 8.100 0.700
1.250
0.0374 0.0067 0.0039 0.5197 0.4606 0.3110 0.0197
inches
0.0492 0.0079 0.0453 0.0106 0.0083 0.0039 0.5354 0.4685
0.0217
0.3189 0.0276
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M27W256
Part numbering
Part numbering
Table
Example: Device Type Supply Voltage 2.7V 3.6V Device Function Kbit (32Kb Speed -100 Design -120 -150 -200
Ordering Information Scheme
M27W256
Package FDIP28W PDIP28 PLCC32 TSOP28: 13.4 Temperature Range
Options ECOPACK® package, Tape Reel Packing
High Speed, Characteristics section further information. This speed also guarantees 70ns access time 3.0V 3.6V. These speeds replaced
Packages option available request. Please contact STMicroelectronics local Sales Office.
list available options (Speed, Package, etc.) further information aspect this device, please contact STMicroelectronics Sales Office nearest you.
21/23
Revision history
M27W256
Revision history
Table
Date 1998 July 1999 March 2000 30-Aug-2002 12-Apr-2006
Document revision history
Revision Changes STMicroelectronics Logo Programming Flowchart clarified (Figure Document Template changed Package mechanical data clarified PDIP28 (Table 12), PLCC32 (Table ,Figure TSOP28 (Table Figure Converted template. Added ECOPACK® information.
22/23
M27W256
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