m27128a STMicroelectronics, m27128a Datasheet

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m27128a

Manufacturer Part Number
m27128a
Description
Nmos 128k 16k X 8 Uv Eprom
Manufacturer
STMicroelectronics
Datasheet

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DESCRIPTION
The M27128A is a 131,072 bit UV erasable and
electrically programmable memory EPROM. It is
organized as 16,384 words by 8 bits.
The M27128A is housed in a 28 Pin Window Ce-
ramic Frit-Seal Dual-in-Line package. The trans-
parent lid allows the user to expose the chip to
ultraviolet light to erase the bit pattern. A new
pattern can then be written to the device by follow-
ing the programming procedure.
Table 1. Signal Names
March 1995
A0 - A13
Q0 - Q7
E
G
P
V
V
V
FAST ACCESS TIME: 200ns
EXTENDED TEMPERATURE RANGE
SINGLE 5 V SUPPLY VOLTAGE
LOW STANDBY CURRENT: 40mA max
TTL COMPATIBLE DURING READ and
PROGRAM
FAST PROGRAMMING ALGORITHM
ELECTRONIC SIGNATURE
PROGRAMMING VOLTAGE: 12V
PP
CC
SS
Address Inputs
Data Outputs
Chip Enable
Output Enable
Program
Program Supply
Supply Voltage
Ground
NMOS 128K (16K x 8) UV EPROM
Figure 1. Logic Diagram
A0-A13
G
P
E
14
28
FDIP28W (F)
V CC
V SS
1
M27128A
V PP
M27128A
8
Q0-Q7
AI00769B
1/10

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m27128a Summary of contents

Page 1

... The M27128A is a 131,072 bit UV erasable and electrically programmable memory EPROM organized as 16,384 words by 8 bits. The M27128A is housed Pin Window Ce- ramic Frit-Seal Dual-in-Line package. The trans- parent lid allows the user to expose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be written to the device by follow- ing the programming procedure ...

Page 2

... Q7 Q6 The M27128A has a standby mode which reduces the maximum active power current from 85mA to Q5 40mA. The M27128A is placed in the standby mode Q4 by applying a TTL high signal to the E input. When Q3 in the standby mode, the outputs are in a high impedance state, independent of the G input. ...

Page 3

... PCB traces. Programming When delivered (and after each erasure for UV EPPROM), all bits of the M27128A are in the “1" state. Data is introduced by selectively program- ming ”0s" into the desired bit locations. Although only “0s” will be programmed, both “1s” and “0s” ...

Page 4

... M27128A AC MEASUREMENT CONDITIONS Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages Note that Output Hi-Z is defined as the point where data is no longer driven. Figure 3. AC Testing Input Output Waveforms 2.4V 0.45V (1) Table 5. Capacitance ( MHz ) A Symbol ...

Page 5

... V PP M27128A ) CC Min Max Unit –0.1 0 0. M27128A Unit -3, -30 -4 Max Min Max Min Max 250 300 450 ns 250 300 450 ns 100 120 150 105 0 130 105 0 130 ns ...

Page 6

... M27128A Table 8. Programming Mode DC Characteristics ( 0.25V Symbol Parameter I Input Leakage Current LI I Supply Current CC I Program Current PP V Input Low Voltage IL V Input High Voltage IH V Output Low Voltage OL V Output High Voltage Voltage ID Note must be applied simultaneously with or before V CC Table 9 ...

Page 7

... Except for E, all like inputs (including G) of the parallel M27128A may be common. A TTL low pulse ap- plied to a M27128A’s E input, with V AI00775B program that M27128A. A high level E input inhibits the other M27128As from being programmed. M27128A tGHQZ tGHAX ...

Page 8

... Research shows that constant exposure to room level fluorescent lighting could erase a typical M27128A in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27128A exposed to these types of lighting conditions ...

Page 9

... M27128A inches Min Max 0.225 0.020 0.070 0.154 0.200 0.016 0.022 0.046 0.056 0.009 0.012 1.500 0.606 0.622 0.514 0.526 – – – – 0.637 0.721 0.125 ...

Page 10

... M27128A Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice ...

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