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M27W402
4 Mbit (256Kb x 16) Low Voltage OTP EPROM
LOW VOLTAGE READ OPERATION: 2.7V to 3.6V FAST READ ACCESS TIME: - 80ns at VCC = 3.0V to 3.6V - 100ns at VCC = 2.7V to 3.6V PIN COMPATIBLE with M27C4002 LOW POWER CONSUMPTION: - 15A max Standby Current - 15mA max Active Current at 5MHz PROGRAMMING TIME 100s/byte (typical) HIGH RELIABILITY CMOS TECHNOLOGY - 2,000V ESD Protection - 200mA Latchup Protection Immunity ELECTRONIC SIGNATURE - Manufacturer Code: 0020h - Device Code: 0044h
PLCC44 (K)
TSOP40 (N) 10 x 20 mm
Figure 1. Logic Diagram
DESCRIPTION The M27W402 is a low voltage 4 Mbit EPROM offeredin the OTP range (one time programmable). It is ideally suited for microprocessor systems requiring large data or program storage and is organised as 262,144 by 16 bits.
VCC
VPP
18 A0-A17
16 Q0-Q15
Table 1. Signal Names
A0-A17 Q0-Q15 E G VPP VCC VSS Address Inputs Data Outputs Chip Enable Output Enable Program Supply Supply Voltage Ground
E G
M27W402
VSS
AI01863
July 1998
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M27W402
Figure 2A. LCC Pin Connections Figure 2B. TSOP Pin Connections
A9 A10 A11 A12 A13 A14 A15 A16 A17 VCC VPP E DQ15 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8 1 40 VSS A8 A7 A6 A5 A4 A3 A2 A1 A0 G DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 VSS
Q12 Q11 Q10 Q9 Q8 VSS NC Q7 Q6 Q5 Q4
Q13 Q14 Q15 E VPP NC VCC A17 A16 A15 A14 1 44 A13 A12 A11 A10 A9 VSS NC A8 A7 A6 A5
12
M27W402
34
10 11
M27W402 (Normal)
31 30
23 Q3 Q2 Q1 Q0 G NC A0 A1 A2 A3 A4
AI01865
20
21
AI01866
Warning: NC = Not Connected.
Table 2. Absolute Maximum Ratings (1)
Symbol TA TBIAS TSTG VIO
(2)
Parameter Ambient Operating Temperature Temperature Under Bias Storage Temperature Input or Output Voltages (except A9) Supply Voltage A9 Voltage Program Supply Voltage
(3)
Value -40 to 85 -50 to 125 -65 to 150 -2 to 7 -2 to 7 -2 to 13.5 -2 to 14
Unit C C C V V V V
VCC VA9 (2) VPP
Notes: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not i mplied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. 2. Minimum DC voltage on Input or Output is -0.5V with possible undershoot to -2.0V for a period less than 20ns. Maximum DC voltage on Output is VCC +0.5V with possible overshoot to VCC +2V for a period less than 20ns. 3. Depends on range.
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M27W402
Table 3. Operating Modes
Mode Read Output Disable Program Verify Program Inhibit Standby Electronic Signature
Note: X = VIH or VIL, VID = 12V 0.5V
E VIL VIL VIL Pulse VIH VIH VIH VIL
G VIL VIH VIH VIL VIH X VIL
A9 X X X X X X VID
VPP VCC or VSS VCC or VSS VPP VPP VPP VCC or VSS VCC
Q0 - Q15 Data Out Hi-Z Data In Data Out Hi-Z Hi-Z Codes
Table 4. Electronic Signature
Identifier Manufacturer's Code Device Code A0 V IL VIH Q7 0 0 Q6 0 1 Q5 1 0 Q4 0 0 Q3 0 0 Q2 0 1 Q1 0 0 Q0 0 0 Hex Data 20h 44h
Note: Outputs Q8-Q15 are set to '0'.
DESCRIPTION (cont'd) The M27W402 operates in the read mode with a supply voltage as low as 2.7V at -40 to 85C temperature range. The decrease in operating power allows either a reduction of the size of the battery or an increase in the time between battery recharges. The M27W402 is offered in both PLCC44 and TSOP40 (10 x 20 mm) packages. DEVICE OPERATION The operationg modes of the M27W402 are listed in the Operating Modes table. A single power supply is required in the read mode. All inputs are TTL levels except for Vpp and 12V on A9 for Electronic Signature. Read Mode The M27W402 has two control functions, both of which must be logically active in order to obtain data at the outputs. Chip Enable (E) is the power control and should be used for device selection. Output Enable (G) is the output control and should be used to gate data to the output pins, independent of device selection. Assuming that the addresses are stable, the address access time (tAVQV) isequal to the delay from E to output(tELQV). Data is available at the output after a delay of tGLQV from the falling edge of G, assuming that E has
been low and the addresses have been stable for at least t AVQV-tGLQV. Standby Mode The M27W402 has a standbymode which reduces the supply current from 15mA to 15A with low voltage operation VCC 3.6V, see Read Mode DC Characteristics table for details. The M27W402 is placed in the standby mode by applying a CMOS high signal to the E input. When in the standby mode, the outputs are in a high impedance state, independent of the G input. Two Line Output Control BecauseEPROMs are usually used in larger memory arrays, the product features a 2 line control function which accommodates the use of multiple memory connection. The two line control function allows: a. the lowest possible memory power dissipation, b. complete assurance that output bus contention will not occur. For the most efficientuse of thesetwo controllines, E should be decoded and used as the primary device selecting function, while G should be made a common connection to all devices in the array and connected to the READ line from the system control bus. This ensures that all deselected memory devices are in their low power standby mode and that the output pins are only active when data is required from a particular memory device.
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M27W402
Table 5. AC Measurement Conditions
High Speed Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages 10ns 0 to 3V 1.5V Standard 20ns 0.4V to 2.4V 0.8V and 2V
Figure 3. AC Testing Input Output Waveform
Figure 4. AC Testing Load Circuit
1.3V
High Speed 3V 1.5V 0V DEVICE UNDER TEST 2.0V 0.8V
AI01822
1N914
3.3k
Standard 2.4V
OUT CL
0.4V
CL = 30pF for High Speed CL = 100pF for Standard CL includes JIG capacitance
AI01823B
Table 6. Capacitance (1) (TA = 25 C, f = 1 MHz )
Symbol CIN C OUT Parameter Input Capacitance Output Capacitance Test Condition VIN = 0V VOUT = 0V Min Max 6 12 Unit pF pF
Note: 1. Sampled only, not 100% tested.
System Considerations The power switching characteristics of Advanced CMOS EPROMs require careful decoupling of the devices. The supply current, ICC, has three segments that are of interest to the system designer: the standby current level, the active current level, and transient current peaks that are produced by the falling and rising edges of E. The magnitude of the transient current peaks is dependent on the output capacitive and inductive loading of the device. The associated transient voltage peaks can be suppressed by complying with the two line output
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control and by properly selected decoupling capacitors. It is recommended that a 0.1F ceramic capacitor be used on every device between VCC and VSS. This should be a high frequency capacitor of low inherent inductance and should be placed as close to the device as possible. In addition, a 4.7F bulk electrolytic capacitor should be used between VCC and VSS for every eight devices. The bulk capacitor should be located near the power supply connection point.The purpose of the bulk capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces.
M27W402
Table 7. Read Mode DC Characteristics (1) (TA = -40 to 85 C; VCC = 2.7V to 3.6V; VPP = VCC)
Symbol ILI Parameter Input Leakage Current Output Leakage Current ILO Test Condition 0V VIN VCC 0V VOUT VCC E = VIL, G = VIL, IOUT = 0mA, f = 5MHz, VCC 3.6V Supply Current (Standby) TTL Supply Current (Standby) CMOS Program Current Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage TTL IOL = 2.1mA IOH = -400A 2.4 E = VIH E > VCC - 0.2V, VCC 3.6V VPP = VCC -0.6 0.7 VCC Min Max 10 10 15 1 15 10 0.2 VCC VCC + 0.5 0.4 Unit A A mA mA A A V V V V
ICC1 ICC2 IPP VIL VIH
(2)
VOL VOH
Notes: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. 2. Maximum DC voltage on Output is VCC +0.5V.
Table 8. Read Mode AC Characteristics (1) (TA = -40 to 85 C; VCC = 2.7V to 3.6V; VPP = VCC)
M27W402 Symbol Alt Parameter Test Condition -100 (3) -120 (-150/-200) Unit
VCC = 3.0V to 3.6V VCC = 2.7V to 3.6V VCC = 2.7V to 3.6V Min tAVQV tELQV tGLQV tEHQZ (2) tGHQZ
(2)
Max 80 80 50
Min
Max 100 100 60
Min
Max 120 120 70 ns ns ns ns ns ns
tACC tCE tOE tDF tDF tOH
Address Valid to Output Valid Chip Enable Low to Output Valid Output Enable Low to Output Valid Chip Enable High to Output Hi-Z Output Enable High to Output Hi-Z Address Transition to Output Transition
E = VIL, G = VIL G = VIL E = VIL G = VIL E = VIL E = VIL, G = VIL 0 0 0
50 50
0 0 0
60 60
0 0 0
70 70
tAXQX
Notes: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. 2. Sampled only, not 100% tested. 3. Speed obtained with High Speed AC measurement conditions.
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M27W402
Figure 5. Read Mode AC Waveforms
A0-A17
VALID tAVQV tAXQX
VALID
E tGLQV G tELQV Q0-Q15 tGHQZ Hi-Z tEHQZ
AI00731B
Table 9. Programming Mode DC Characteristics (1) (TA = 25 C; VCC = 6.25V 0.25V; VPP = 12.75V 0.25V)
Symbol ILI ICC IPP VIL V IH VOL V OH V ID Parameter Input Leakage Current Supply Current Program Current Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage TTL A9 Voltage IOL = 2.1mA IOH = -400A 2.4 11.5 12.5 E = VIL -0.3 2 Test Condition 0 VIN VCC Min Max 10 50 50 0.8 VCC + 0.5 0.4 Unit A mA mA V V V V V
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
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M27W402
Table 10. Programming Mode AC Characteristics (1) (TA = 25 C; VCC = 6.25V 0.25V; VPP = 12.75V 0.25V)
Symbol tAVEL tQVEL tVPHEL tVCHEL tELEH tEHQX tQXGL tGLQV tGHQZ tGHAX Alt tAS tDS tVPS tVCS tPW tDH tOES tOE tDFP tAH Parameter Address Valid to Chip Enable Low Input Valid to Chip Enable Low VPP High to Chip Enable Low VCC High to Chip Enable Low Chip Enable Program Pulse Width Chip Enable High to Input Transition Input Transition to Output Enable Low Output Enable Low to Output Valid Output Enable High to Output Hi-Z Output Enable High to Address Transition 0 0 Test Condition Min 2 2 2 2 95 2 2 100 130 105 Max Unit s s s s s s s ns ns ns
Notes: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. 2. Sampled only, not 100% tested.
Figure 6. Programming and Verify Modes AC Waveforms
A0-A17 tAVEL Q0-Q15 DATA IN tQVEL VPP tVPHEL VCC tVCHEL E tELEH G
VALID
DATA OUT tEHQX
tGLQV
tGHQZ
tGHAX
tQXGL
PROGRAM
VERIFY
AI00730
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M27W402
Figure 7. Programming Flowchart ming with PRESTO II consists of applying a sequence of 100s program pulses to each byte until a correct verify occurs (see Figure 7). During programming and verify operation, a MARGIN MODE circuit is automaticallyactivated in order to guarantee that each cell is programmed with enough margin. No overprogrampulse is applied since the verify in MARGIN MODE at VCC much higher than 3.6V, provides necessary margin to each programmed cell. Program Inhibit Programming of multiple M27W402s in parallel with different data is also easily accomplished. Except for E, all like inputs including G of the parallel M27W402 may be common. A TTL low level pulse applied to a M27W402's E input, with VPP at 12.75V,will program that M27W402. A high level E input inhibits the other M27W402s from being programmed. Program Verify A verify (read) should be performed on the programmed bits to determine that they were correctly programmed. The verify is accomplished with G at VIL, E at VIH, VPP at 12.75V and VCC at 6.25V. On-Board Programming The M27W402 can be directly programmed in the application circuit. See the relevant Application Note AN620. Electronic Signature The Electronic Signature (ES) mode allows the reading out of a binary code from an EPROM that will identify its manufacturer and type. This mode is intended for use by programming equipment to automatically match the device to be programmed with its correspondingprogramming algorithm. The ES mode is functional in the 25C 5C ambient temperature range that is required when programming the M27W402. To activate the ES mode, the programming equipmentmust force 11.5Vto 12.5V on address line A9 of the M27W402 with VPP=VCC=5V. Two identifier bytes may then be sequenced from the device outputs by toggling address line A0 from VIL to VIH. All other address lines must be held at VIL during Electronic Signature mode. Byte 0 (A0=VIL) represents the manufacturer code and byte 1 (A0=VIH) the device identifier code. For the STMicroelectronics M27W402, these two identifier bytes are given in Table 4 and can be read-out on outputs Q0 to Q7. Note that the M27W402 and M27C4002 have the same identifier bytes.
VCC = 6.25V, VPP = 12.75V
n=0
E = 100s Pulse NO ++n = 25 YES NO VERIFY YES Last Addr NO ++ Addr
FAIL
YES CHECK ALL WORDS 1st: VCC = 6V 2nd: VCC = 4.2V
AI00726C
Programming The M27W402 has been designed to be fully compatible with the M27C4002 and has the same electronic signature.As a result the M27W402 can be programmed as the M27C4002 on the same programming equipment applying 12.75V on VPP and 6.25V on VCC by the use of the same PRESTO II algorithm. When delivered, all bits of the M27W402 are in the '1' state. Data is introduced by selectively programming '0's into the desired bit locations. Although only '0's will be programmed,both '1's and '0's can be present in the data word. The M27W402 is in the programming mode when VPP input is at 12.75V, G is at VIH and E is pulsed to VIL. The data to be programmed is applied to 16 bits in parallel to the data output pins. The levels required for the address and data inputs are TTL. VCC is specified to be 6.25V 0.25V. PRESTO II Programming Algorithm PRESTO II Programming Algorithm allows the whole array to be programmed with a guaranteed margin, in a typical time of 26.5 seconds.Program-
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M27W402
ORDERING INFORMATION SCHEME Example: M27W402 -100 K 6 TR
Speed -100 (1,2) -120 100 ns 120 ns K N
Package PLCC44 TSOP40 10 x 20mm
Temperature Range 6 -40 to 85 C TR
Option Tape & Reel Packing
NOT FOR NEW DESIGN (3) -150 -200 150 ns 200 ns
Notes: 1. High Speed, see AC Characteristics section for further information. 2. This speed also guarantees 80ns access time at VCC = 3.0V to 3.6V. 3. These speeds are replaced by the 120ns.
For a list of available options (Speed, Package etc...) or for further information on any aspect of this device, please contact the STMicroelectronics Sales Office nearest to you.
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M27W402
PLCC44 - 44 lead Plastic Leaded Chip Carrier, square
Symb Typ A A1 A2 B B1 D D1 D2 E E1 E2 e F R N CP 0.89 1.27 mm Min 4.20 2.29 - 0.33 0.66 17.40 16.51 14.99 17.40 16.51 14.99 - 0.00 - 44 0.10 Max 4.70 3.04 0.51 0.53 0.81 17.65 16.66 16.00 17.65 16.66 16.00 - 0.25 - 0.035 0.050 Typ inches Min 0.165 0.090 - 0.013 0.026 0.685 0.650 0.590 0.685 0.650 0.590 - 0.000 - 44 0.004 Max 0.185 0.120 0.020 0.021 0.032 0.695 0.656 0.630 0.695 0.656 0.630 - 0.010 -
D D1
1N
A1 A2
B1
Ne
E1 E
F 0.51 (.020)
D2/E2 B
e
1.14 (.045)
Nd
A R CP
PLCC
Drawing is not to scale.
10/12
M27W402
TSOP40 - 40 lead Plastic Thin Small Outline, 10 x 20mm
Symb Typ A A1 A2 B C D D1 E e L N CP 0.50 0.05 0.95 0.17 0.10 19.80 18.30 9.90 - 0.50 0 40 0.10 mm Min Max 1.20 0.15 1.05 0.27 0.21 20.20 18.50 10.10 - 0.70 5 0.020 0.002 0.037 0.007 0.004 0.780 0.720 0.390 - 0.020 0 40 0.004 Typ inches Min Max 0.047 0.006 0.041 0.011 0.008 0.795 0.728 0.398 - 0.028 5
A2
1 N
e E B
N/2
D1 D
A CP
DIE
C
TSOP-a
Drawing is not to scale.
A1
L
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M27W402
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 1998 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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