M87C257-90C1 STMicroelectronics, M87C257-90C1 Datasheet - Page 9

• Manufacturer Part Number: M87C257-90C1
• Description: IC OTP 256KBIT 90NS 32PLCC
• Manufacturer: STMicroelectronics

Specifications of M87C257-90C1

• Format - Memory: EPROMs
• Memory Type: OTP EPROM
• Memory Size: 256K (32K x 8)
• Speed: 90ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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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