M27V322 datasheet(9/23 Pages) STMICROELECTRONICS

Part #	M27V322

Description	32 Mbit (2Mb ×16) low-voltage UV EPROM and OTP EPROM

PDF	23 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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9 / 23 page

M27V322

Device operation

9/23

Figure 3.

Programming flowchart

2.7

Program Inhibit

Programming of multiple M27V322s in parallel with different data is also easily

accomplished. Except for E, all like inputs including GVPP of the parallel M27V322 may be

common. A TTL low level pulse applied to a M27V322's E input and VPP at 12V, will program

that M27V322. A high level E input inhibits the other M27V322s 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 GVPP at VIL. Data should be verified

with tELQV after the falling edge of E.

2.9

On-Board programming

The M27V322 can be directly programmed in the application circuit. See the relevant

Application Note AN620.

AI03059B

n = 0

Last

Addr

VERIFY

E = 50

µs Pulse

++n

= 25

++ Addr

VCC = 6.25V, VPP = 12V

FAIL

CHECK ALL WORDS

1st: VCC = 5V

2nd: VCC = 3V

YES

SET MARGIN MODE

RESET MARGIN MODE

M27V322 Datasheet(PDF) 9 Page - STMicroelectronics