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M27C320-100M1 Datasheet(PDF) 11 Page - STMicroelectronics |
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M27C320-100M1 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 15 page 11/15 M27C320 On-Board Programming The M27C320 can be directly programmed in the application circuit. See the relevant Application Note AN620. 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 outputs by toggling address line A0 from VIL to VIH. All oth- er address lines must be held at VIL during Elec- tronic 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 iden- tifier bytes are given in Table 4 and can be read- out on outputs Q0 to Q7. |
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