M87C257-10C6 Просмотр технического описания (PDF) - STMicroelectronics

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Компоненты Описание

производитель

M87C257-10C6

Address Latched 256 Kbit (32Kb x8) UV EPROM and OTP EPROM

STMicroelectronics 

M87C257

Figure 4. Programming flowchart

VCC = 6.25V, VPP = 12.75V

n=0

NO

++n

= 25

YES

E = 100µs Pulse

NO

VERIFY

YES

++ Addr

FAIL

Last NO

Addr

YES

CHECK ALL BYTES

1st: VCC = 6V

2nd: VCC = 4.2V

AI00760B

Device operation

2.7

Program Inhibit

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 VPP at 12.75V, will

program that M87C257. A high level E input inhibits the other M87C257s from being

programmed.

2.8

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.

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