M87C257 datasheet(9/22 Pages) STMICROELECTRONICS

部件名	M87C257

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

PDF	22 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

9 / 22 page

M87C257

Device operation

9/22

Figure 4.

Programming flowchart

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.

AI00760B

n = 0

Last

Addr

VERIFY

E = 100

µs Pulse

++n

= 25

++ Addr

VCC = 6.25V, VPP = 12.75V

FAIL

CHECK ALL BYTES

1st: VCC = 6V

2nd: VCC = 4.2V

YES

M87C257 数据表(PDF) 9 Page - STMicroelectronics