4800 Great America Parkway Ste 202

Tel: 408-235-8680

Santa Clara, CA. 95054

Fax: 408-235-8685

Preliminary

4

EN27LV020 / EN27LV020B

PROGRAM INHIBIT MODE

Programming of multiple EN27LV020 / EN27LV020B in parallel with different data is also

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

parallel EN27LV020 / EN27LV020B may be common. A TTL low-level program pulse applied

HIGH will program that EN27LV020 / EN27LV020B. A high-level CE input inhibits the other

EN27LV020 / EN27LV020B from being programmed.

PROGRAM VERIFY MODE

Verification should be performed on the programmed bits to determining that they were

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 EN27LV020 / EN27LV020B.

To activate this mode, the programming equipment must force 12.0 V

± 0.5V on address line A9

of the EN27LV020 / EN27LV020B. Two identifier bytes may then be sequenced from the device

the EN27LV020 / EN27LV020B 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)

code of 7F, continuation code, to signify the unavailability of manufacturer ID codes.