Mbit (256Kb low-voltage EPROM EPROM Feature summary 2.7V 3.6

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Mbit (256Kb low-voltage EPROM EPROM Feature summary 2.7V 3.6

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M27W402
Mbit (256Kb low-voltage EPROM EPROM
Feature summary
2.7V 3.6V supply voltage Read operation Access time: 80ns 3.0V 3.6V 100ns 2.7V 3.6V compatible with M27C4002 power consumption: 15µA Standby Current 15mA Active Current 5MHz Programming time 100µs/word High reliability CMOS technology 2,000V Protection 200mA Latchup Protection Immunity Electronic signature Manufacturer Code: 0020h Device Code: 0044h ECOPACK® packages available
PDIP40
PLCC44
2006
1/21
www.st.com
Contents
M27W402
Contents
Summary description Device operation
2.10 Read mode Standby mode Line Output Control System considerations Programming PRESTO programming algorithm Program Inhibit Program Verify Electronic signature Erasure operation (applies EPROM)
Maximum rating parameters Package mechanical Part numbering Revision history
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M27W402
List tables
List tables
Table Table Table Table Table Table Table Table Table Table Table Table Table Table Signal names Operating modes Electronic Signature Absolute maximum ratings measurement conditions. Capacitance Read mode characteristics Programming mode characteristics Read mode characteristics Programming mode characteristics PDIP40 Plastic DIP, mils width, package mechanical data PLCC44 lead Plastic Leaded Chip Carrier, package mechanical data Ordering information scheme Document revision history
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List figures
M27W402
List figures
Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Logic diagram PDIP connections connections Programming flowchart testing input output waveform testing load circuit Read mode waveforms Programming Verify modes waveforms PDIP40 lead Plastic DIP, mils width, package outline PLCC44 lead Plastic Leaded Chip Carrier, package outline
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M27W402
Summary description
Summary description
M27W402 voltage Mbit EPROM offered range (Ultra Violet Erase) (one time programmable). ideally suited microprocessor systems requiring large data program storage organized 262,144 bits. M27W402 operates read mode with supply voltage 2.7V 85°C temperature range. decrease operating power allows either reduction size battery increase time between battery recharges. FDIP40W (window ceramic frit-seal package) transparent lids which allow user expose chip ultraviolet light erase pattern. pattern then written device following programming procedure. applications where content programmed only time erasure required, M27W402 offered PDIP40 PLCC44 packages. order meet environmental requirements, offers M27W402 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
A0-A17
M27W402
Q0-Q15
AI01863
5/21
Summary description Table
A0-A17 Q0-Q15
M27W402 Signal names
Address Inputs Data Outputs Chip Enable Output Enable Program Supply Supply Voltage Ground Connected Internally
Figure
PDIP connections
M27W402
AI02672
6/21
M27W402 Figure connections
Summary description
M27W402
AI01865
7/21
Device operation
M27W402
Device operation
operation modes M27W402 listed Operating Modes table. single power supply required read mode. inputs levels except Electronic Signature.
Read mode
M27W402 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.
Standby mode
M27W402 standby mode which reduces supply current from 15mA 15µA with voltage operation 3.6V, Read Mode Characteristics table details. M27W402 placed standby mode applying CMOS high signal input. When standby mode, outputs high impedance state, independent input.
Line Output Control
Because EPROMs usually used larger memory arrays, product features 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 devices array connected READ line from system control bus. This ensures that deselected memory devices their power standby mode that output pins only active when data required from particular memory device.
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M27W402
Device operation
System considerations
power switching characteristics Advanced 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 transient current peaks dependent output capacitive inductive loading device. 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.The purpose bulk capacitor overcome voltage drop caused inductive effects traces.
Programming
M27W402 been designed fully compatible with M27C4002 same electronic signature. result M27W402 programmed M27C4002 same programming equipment applying 12.75V 6.25V same PRESTO algorithm. When delivered (and after each `1's erasure EPROM), bits M27W402 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). M27W402 programming mode when input 12.75V, pulsed VIL. data programmed applied bits parallel data output pins. levels required address data inputs TTL. specified 6.25V 0.25V.
PRESTO programming algorithm
PRESTO Programming Algorithm allows whole array programmed with guaranteed margin, typical time 26.5 seconds. Programming with PRESTO consists applying 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.
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Device operation Figure Programming flowchart
6.25V, 12.75V
M27W402
100µs Pulse VERIFY Last Addr Addr
FAIL
CHECK WORDS 1st: 2nd: 2.7V
AI00726D
Program Inhibit
Programming multiple M27W402s parallel with different data also easily accomplished. Except like inputs including parallel M27W402 common. level pulse applied M27W402's input, with 12.75V, will program that M27W402. high level input inhibits other M27W402s 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.
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M27W402
Device operation
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 M27W402. activate mode, programming equipment must force 11.5V 12.5V address line M27W402 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 M27W402, these identifier bytes given Table read-out outputs Note that M27W402 M27C4002 have same identifier bytes.
2.10
Erasure operation (applies EPROM)
erasure characteristics M27W402 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 M27W402 about years, while would take approximately week cause erasure when exposed direct sunlight. M27W402 exposed these types lighting conditions extended periods time, suggested that opaque labels over M27W402 window prevent unintentional erasure. recommended erasure procedure M27W402 exposure short wave ultraviolet light which wavelength 2537 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. M27W402 should placed within 2.5cm inch) lamp tubes during erasure. Some lamps have filter their tubes which should removed before erasure. Table Operating modes(1)
Mode
Read
Output Disable Program Verify
Q15-Q0 Data Hi-Z Data Data Hi-Z Hi-Z Codes
Pulse
Program Inhibit Standby Electronic Signature
VIL, 0.5V.
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Maximum rating Table Electronic Signature(1)
M27W402
Identifier Manufacturer's Code Device Code
Data
Outputs Q15-Q8 '0'.
Maximum rating
Stressing device above rating listed Absolute Maximum Ratings table 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. Table
Symbol TBIAS TSTG VIO(2)
Absolute maximum ratings
Parameter Ambient Operating Temperature(1) Temperature Under Bias Storage Temperature Input Output Voltage (except Supply Voltage Voltage
Program Supply Voltage
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.
Value
Unit
13.5
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M27W402
parameters
parameters
This section summarizes operating measurement conditions, characteristics device. parameters Characteristic tables that follow derived from tests performed under Measurement Conditions summarized relevant tables. Designers should check that operating conditions their circuit match measurement conditions when relying quoted parameters. Table measurement conditions
High Speed Input Rise Fall Times Input Pulse Voltages Input Output Timing Ref. Voltages 10ns 1.5V Standard 20ns 0.4V 2.4V 0.8V
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
13/21
parameters Table
Symbol COUT
M27W402 Capacitance(1)
Parameter Test Condition VOUT Unit
Input Capacitance Output Capacitance
Sampled only, 100% tested.
Table
Symbol ICC1 ICC2 VIH(3)
Read mode characteristics(1)
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 Test Condition VOUT VIL, VIL, IOUT 0mA, 5MHz, 3.6V 0.2V, 3.6V Unit
2.1mA
-400µA
85°C; 2.7V 3.6V; Maximum voltage Output +0.5V.
must applied simultaneously with before removed simultaneously after VPP.
Table
Symbol
Programming mode characteristics(1)
Input Leakage Current Supply Current Program Current Input Voltage Input High Voltage Output Voltage Output High Voltage Voltage
Parameter
-0.6
Test Condition
Unit
-0.3 2.1mA -400µA 11.5
12.5
6.25V 0.25V; 12.75V 0.25V must applied simultaneously with before removed simultaneously after VPP.
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M27W402 Figure Read mode waveforms
parameters
A0-A17
VALID tAVQV tAXQX
VALID
tGLQV tELQV Q0-Q15 tGHQZ Hi-Z tEHQZ
AI00731B
Table
Read mode characteristics(1)
M27W402 -100(3)
-120 (-150/-200)
Symbol
Parameter
Test Condition 3.0V 2.7V 3.6V 3.6V
tAVQV tELQV tGLQV tEHQZ(4) tGHQZ(4) tAXQX
tACC
Address Valid Output Valid Chip Enable Output Valid Output Enable Output Valid Chip Enable High Output Hi-Z
85°C; 2.7V 3.6V; must applied simultaneously with before removed simultaneously after VPP. Speed obtained with High Speed measurement conditions. Sampled only, 100% tested.
Output Enable High Output Hi-Z
VIL,
VIL,
2.7V 3.6V
Unit
Address Transition Output Transition
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parameters Figure
A0-A17 tAVEL Q0-Q15 DATA tQVEL tVPHEL tVCHEL tELEH tQXGL tGHAX tGLQV tGHQZ tEHQX DATA
M27W402 Programming Verify modes waveforms
VALID
PROGRAM
VERIFY
Table
Symbol tAVEL tQVEL tVPHEL tVCHEL tELEH tEHQX tQXGL tGLQV
Programming mode characteristics(1)
tVPS tVCS tOES Parameter Address Valid Chip Enable Input Valid Chip Enable High Chip Enable
High Chip Enable
Chip Enable Program Pulse Width Chip Enable High Input Transition
tGHQZ
tGHAX
tDFP
Input Transition Output Enable Output Enable Output Valid Output Enable High Output Hi-Z Output Enable High Address Transition
Test Condition
AI00730
Unit
6.25V 0.25V; 12.75V 0.25V must applied simultaneously with before removed simultaneously after VPP. Sampled only, 100% tested.
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M27W402
Package mechanical
Package mechanical
Figure PDIP40 lead Plastic DIP, mils width, package outline
PDIP
Drawing scale.
Table
Symbol
PDIP40 Plastic DIP, mils width, package mechanical data
millimeters 0.38 3.56
4.45 0.64
48.26
1.14 0.20 51.78 14.80 13.46 15.24 3.05 1.52
0.38
3.91 0.53 1.78 0.31 52.58 16.26 13.99 17.78 3.81 2.29
0.175 0.025
inches 0.015 0.140 0.015 0.045 0.008 2.039
0.154 0.021 0.070 0.012 2.070 0.640 0.551
1.900
0.583 0.530
2.54
0.100 0.600
0.600 0.120 0.060
15.24
0.700 0.150 0.090
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Package mechanical Figure PLCC44 lead Plastic Leaded Chip Carrier, package outline
M27W402
PLCC-B
Drawing scale.
Table
Symbol
PLCC44 lead Plastic Leaded Chip Carrier, package mechanical data
millimeters 4.200 2.290 3.650 0.331 4.570
0.510
0.661
3.700 0.533 0.812 0.101 17.650 16.662 16.000 17.650 16.660 16.000
3.040
0.0201
inches
0.1799 0.1197 0.1457 0.0210 0.0320 0.0040
0.1654 0.0902 0.1437 0.0130 0.0260
17.400 16.510 14.990
0.6850 0.6500 0.5902 0.5000 0.6850 0.6500 0.5902 0.5000 0.0500
0.6949 0.6560 0.6299 0.6949 0.6559 0.6299
12.700
17.400 16.510 14.990
12.700 1.270
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M27W402
Part numbering
Part numbering
Table
Example: Device Type Supply Voltage 2.7V 3.6V Device Function Mbit (256Kb x16) Speed -100(1),(2) -120 Design(3) -150 -200 Package PDIP40 PLCC44 Temperature Range Option
Ordering information scheme
M27W402 -100
Tape Reel Packing
High Speed, Section parameters further information. This speed also guarantees 80ns access time 3.0V 3.6V. These speeds replaced 120ns.
list available options (Speed, Package, etc.) further information aspect this device, please contact STMicroelectronics Sales Office nearest you.
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Revision history
M27W402
Revision history
Table
Date July 1999
Document revision history
Revision First Issue FDIP42W Package Dimension, added (Table TSOP40 Package Dimension changed (Table 70°C Temperature Range deleted Programming Time changed Document converted template (sections added, information moved). Packages ECOPACK® compliant. PLCC44 package specification updated (see Table Figure 10), FDIP40 TSOP40 packages removed. Changes
03/15/00
22-May-2006
20/21
M27W402
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Mbit (256Kb low-voltage EPROM EPROM Feature summary 2.7V 3.6

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