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M27128A-3F1 View Datasheet(PDF) - STMicroelectronics

Part NameM27128A-3F1 ST-Microelectronics
STMicroelectronics ST-Microelectronics
DescriptionNMOS 128K (16K x 8) UV EPROM
M27128A-3F1 Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
M27128A
Figure 6. Programming and Verify Modes AC Waveforms
A0-A13
Q0-Q7
VPP
VCC
E
P
G
tAVPL
DATA IN
tQVPL
tVPHPL
tVCHPL
tELPL
tPLPH
VALID
tPHQX
DATA OUT
tGLQV
tQXGL
PROGRAM
VERIFY
tGHQZ
tGHAX
AI00772
Figure 7. Programming Flowchart
VCC = 6V, VPP = 12.5V
n=1
NO
++n
> 25
YES
FAIL
P = 1ms Pulse
NO
VERIFY
++ Addr
YES
P = 3ms Pulse by n
Last NO
Addr
YES
CHECK ALL BYTES
VCC = 5V, VPP 5V
AI00775B
DEVICE OPERATION (cont’d)
continually monitored to determine when it has
been successfully programmed. A flowchart of the
M27128A Fast Programming Algorithm is shown
on the last page. The Fast Programming Algorithm
utilizes two different pulse types: initial and over-
program.
The duration of the initial P pulse(s) is 1ms, which
will then be followed by a longer overprogram pulse
of length 3ms by n (n is equal to the number of the
initial one millisecond pulses applied to a particular
M27128A location), before a correct verify occurs.
Up to 25 one-millisecond pulses per byte are pro-
vided for before the over program pulse is applied.
The entire sequence of program pulses and byte
verifications is performed at VCC = 6V and VPP =
12.5V. When the Fast Programming cycle has been
completed, all bytes should be compared to the
original data with VCC = 5 and VPP = 5V.
Program Inhibit
Programming of multiple M27128A’s in parallel with
different data is also easily accomplished. 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 VPP = 12.5V, will
program that M27128A. A high level E input inhibits
the other M27128As from being programmed.
7/10
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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 Ceramic 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 following the programming procedure.

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

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