27C160 查看數據表（PDF） - STMicroelectronics
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27C160 Datasheet PDF : 26 Pages
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Device description
M27C160
applying a sequence of 50µs program pulses to each word until a correct verify occurs (see
Figure 5). During programing and verify operation a Margin mode circuit is automatically
activated to guarantee that each cell is programed with enough margin. No overprogram
pulse is applied since the verify in Margin mode provides the necessary margin to each
programmed cell.
Figure 5.
Programming Flowchart
VCC = 6.25V, VPP = 12.5V
n=0
NO
++n
= 25
YES
E = 50µs Pulse
NO
VERIFY
YES
++ Addr
FAIL
Last NO
Addr
YES
CHECK ALL WORDS
BYTEVPP =VIH
1st: VCC = 6V
2nd: VCC = 4.2V
AI01044B
2.7
Program Inhibit
Programming of multiple M27C160s in parallel with different data is also easily
accomplished. Except for E, all like inputs including G of the parallel M27C160 may be
common. A TTL low level pulse applied to a M27C160's E input and VPP at 12.5V, will
program that M27C160. A high level E input inhibits the other M27C160s 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 E at VIH and G at VIL, VPP at 12.5V
and VCC at 6.25V.
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
10/26
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