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M27C405-80K6TR Datasheet(PDF) 10 Page - STMicroelectronics |
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M27C405-80K6TR Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 15 page Warning: compatibility with FLASH Memory Compatibility issues may arise when replacing the compatible Single Supply 4 Megabit FLASH Mem- ory (the M29F040) by the M27C405. The VPP pin of the M27C405 corresponds to the ”W” pin of the M29F040. The M27C405 VPP pin can withstand voltages up to 12.75V, while the ”W” pin of the M29F040 is a normal control signal input and may be damaged if a high voltage is applied; special precautions must be taken when program- ming in-circuit. However if an already programmed M27C405 is used, this can be directly put in place of the FLASH Memoryas the VPP input,when not in programming mode, is set to VCC or VSS. Changes to PRESTO II. The duration of the pro- gramming pulse is reduced to 20 µs, making the programming time of the M27C405 comparable with the counterpart FLASH Memory. Electronic Signature The Electronic Signature (ES) mode allows the reading out of a binary code from an OTP EPROM that will identify its manufacturer and type. this mode is intended for use by programming equip- ment to automatically match the device to be pro- grammed with its corresponding programming algorithm. This mode is functionalin the 25 °C ± 5°C ambient temperature range that is required when programming the M27C405. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27C405 with VPP=VCC=5V. Two identifierbytes may then be sequenced from the device outputs by toggling address 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 manu- facturer code and byte 1 (A0=VIH) the device identifier code. For the STMicroelectronics M27C405, these two identifier bytes are given in Table 4 and can be read-out on outputs Q0 to Q7. 10/15 M27C405 |
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