M87C257-12F1 STMicroelectronics, M87C257-12F1 Datasheet - Page 9
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M87C257-12F1
Manufacturer Part Number
M87C257-12F1
Description
IC EPROM 256KBIT 120NS 28CDIP
Manufacturer
STMicroelectronics
Datasheet
1.M87C257-12F1.pdf
(22 pages)
Specifications of M87C257-12F1
Format - Memory
EPROMs
Memory Type
UV EPROM
Memory Size
256K (32K x 8)
Speed
120ns
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Package / Case
28-CDIP (0.600", 15.24mm) Window
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
M87C257-12F1
Manufacturer:
ST
Quantity:
5 120
Part Number:
M87C257-12F1
Manufacturer:
ST
Quantity:
20 000
M87C257
2.7
2.8
Program Inhibit
Program Verify
Figure 4.
Programming of multiple M87C257s in parallel with different data is also easily
accomplished. Except for E, all like inputs including G of the parallel M87C257 may be
common. A TTL low level pulse applied to a M87C257's E input, with V
program that M87C257. A high level E input inhibits the other M87C257s from being
programmed.
A verify (read) should be performed on the programmed bits to determine that they were
correctly programmed. The verify is accomplished with G at V
V
CC
at 6.25V.
Programming flowchart
YES
NO
FAIL
= 25
++n
V CC = 6.25V, V PP = 12.75V
CHECK ALL BYTES
NO
2nd: V CC = 4.2V
E = 100 s Pulse
1st: V CC = 6V
VERIFY
n = 0
Addr
Last
YES
YES
NO
++ Addr
AI00760B
IL
, E at V
IH
PP
, V
Device operation
at 12.75V, will
PP
at 12.75V and
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