EN27C02045J View Datasheet(PDF) - Eon Silicon Solution Inc.

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EN27C02045J

2Megabit EPROM (256K x 8)

Eon Silicon Solution Inc. 

EN27C020

PROGRAM INHIBIT MODE

Programming of multiple EN27C020 in parallel with different data is also easily

accomplished by using the Program Inhibit Mode. Except for CE , all like inputs of the

parallel EN27C020 may be common. A TTL low-level program pulse applied to an

EN27C020 CE input with VPP = 12.75 ± 0.25V PGM LOW, and OE HIGH will program that

EN27C020. A high -level CE input inhibits the other EN27C020 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 and CE at VIL,

PGM at VIH, and VPP at it programming voltage.

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 EN27C020.

To activate this mode, the programming equipment must force 12.0 V ± 0.5V on address line A9

of the EN27C020. 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 EN27C020, 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 EN27C020 will read out the binary code of 7F, continuation code,

to signify the unavailability of manufacturer ID codes.

4800 Great America Parkway Ste 202

Santa Clara, CA. 95054

4

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Tel: 408-235-8680

Fax: 408-235-8685

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