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M27V320-120M6 Datasheet(PDF) 11 Page - STMicroelectronics |
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M27V320-120M6 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 15 page 11/15 M27V320 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 M27V320. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27V320, with VPP = VCC = 5V. Two identifier bytes may then be sequenced from the device outputs by toggling ad- dress line A0 from VIL to VIH. All other address lines must be held at VIL during Electronic Signa- ture mode. Byte 0 (A0 = VIL) represents the manufacturer code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics M27V320, these two identifier bytes are given in Table 4 and can be read-out on outputs Q7 to Q0. |
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