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EN27C51270P Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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EN27C51270P Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
4 / 12 page EN27C512 4800 Great America Parkway Ste 202 Tel: 408-235-8680 Santa Clara, CA. 95054 Fax: 408-235-8685 4 PROGRAM INHIBIT MODE Programming of multiple EN27C512 in parallel with different data is also easily accomplished by using the Program Inhibit Mode. Except for CE , all like inputs of the parallel EN27C512 may be common. A TTL low-level program pulse applied to an EN27C512 CE input with OE /VPP = 12.75 ± 0.25V will program that EN27C512. A high-level CE input inhibits the other EN27C512 from being programmed. PROGRAM VERIFY MODE Verification should be performed on the programmed bits to determining that they were correctly programmed. The verification should be performed with OE /VPP and CE at VIL. Data should be verified at tDV after the falling edge of CE . AUTO PRODUCT IDENTIFICATION The Auto Product Identification 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 for the purpose of automatically matching the device to be programmed with its corresponding programming algorithm. This mode is functional in the 25 °C ± 5°C ambient temperature range that is required when programming the EN27C512. To activate this mode, the programming equipment must force 12.0 V ± 0.5V on address line A9 of the EN27C512. Two identifier bytes may then be sequenced from the device outputs by toggling address line A0 from VIL to VIH, when A1 = VIH. All other address lines must be held at VIL during Auto Product Identification mode. Byte 0 (A0 = VIL) represents the manufacturer code, and byte 1 (A0 = VIH), the device code. For the EN27C512, these two identifiers bytes are given in the Mode Select Table. All identifiers for manufacturer and device codes will possess odd parity, with the MSB (DQ7) defined as the parity bit. When A1 = VIL, the EN27C512 will read out the binary code of 7F, continuation code, to signify the unavailability of manufacturer ID codes. |
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