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M87C257 bảng dữ liệu(PDF) 9 Page - STMicroelectronics

tên linh kiện M87C257
Giải thích chi tiết về linh kiện  Address Latched 256 Kbit (32Kb x8) UV EPROM and OTP EPROM
PDF  22 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M87C257 bảng dữ liệu(HTML) 9 Page - STMicroelectronics

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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
NO
YES
NO
YES
NO



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