M27C801-90K6 データシートの表示（PDF） - STMicroelectronics

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M27C801-90K6

8 Mbit (1Mb x 8) UV EPROM and OTP EPROM

STMicroelectronics 

Device description

Figure 4. Programming flowchart

VCC = 6.25V, VPP = 12.75V

SET MARGIN MODE

n=0

NO

++n

= 25

YES

E = 50µs Pulse

NO

VERIFY

YES

++ Addr

FAIL

Last NO

Addr

YES

RESET MARGIN MODE

CHECK ALL BYTES

1st: VCC = 6V

2nd: VCC = 4.2V

AI01271B

M27C801

2.7

Program Inhibit

Programming of multiple M27C801s in parallel with different data is also easily

accomplished. Except for E, all like inputs including GVPP of the parallel M27C801 may be

common. A TTL low level pulse applied to a M27C801's E input, with VPP at 12.75V, will

program that M27C801. A high level E input inhibits the other M27C801s 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. Data should be verified

with tELQV after the falling edge of E.

2.9

Electronic Signature

The Electronic Signature (ES) mode allows the reading out of a binary code from an

EPROM that will identify its manufacturer and type. This mode is intended for use by

programming equipment to automatically match the device to be programmed with its

corresponding programming algorithm. The ES mode is functional in the 25°C ± 5°C

ambient temperature range that is required when programming the M27C801. To activate

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