M27C320 Ver la hoja de datos (PDF) - STMicroelectronics

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M27C320

32 Mbit (4Mb x8 or 2Mb x16) OTP EPROM

STMicroelectronics 

M27C320

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 am-

bient temperature range that is required when pro-

gramming the M27C320. To activate the ES

mode, the programming equipment must force

11.5V to 12.5V on address line A9 of the

M27C320, with VPP = VCC = 5V. Two identifier

bytes may then be sequenced from the device out-

puts by toggling address line A0 from VIL to VIH. All

other address lines must be held at VIL during

Electronic Signature mode.

Byte 0 (A0 = VIL) represents the manufacturer

code and byte 1 (A0 = VIH) the device identifier

code. For the STMicroelectronics M27C320, these

two identifier bytes are given in Table 4 and can be

read-out on outputs Q7 to Q0.

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