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UPI-C42/UPI-L42

WAVEFORMS (Continued)

COMBINATION PROGRAM/VERIFY MODE

290414–25

NOTES:

1. A

must be held low (0V) during program/verify modes.

2. For V

IH1

IL1

DDH

, and V

DDL

, please consult the D.C. Characteristics Table.

3. When programming the 87C42, a 0.1 mF capacitor is required across V

and ground to suppress spurious voltage

transients which can damage the device.

VERIFY MODE

290414–26

NOTES:

1. PROG must float if EA is low.

2. PROG must float or

5V when EA is high.

3. P

–P

5V or must float.

4. P

–P

5V or must float.

5. A

must be held low during programming/verify modes.

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