HN27C256AG データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HN27C256AG

32768-word × 8-bit UV Erasable and Programmable ROM

Hitachi -> Renesas Electronics 

HN27C256AG Series

High Performance Programming Timing Waveform

Program

Address

tAS

Data

VPP

VCC

VPP

VCC

VCC + 1

VCC

Data In Stable

tDS

tDH

tVPS

tVCS

Program Verify

tAH

Data Out Valid

tDF

CE

tPW

tOES

tOE

OE

Erase

Erasure of HN27C256AG is performed by exposure to ultraviolet light of 2537 Å and all the output data are

changed to “1” after this erasure procedure. The minimum integrated dose (i.e. UV intensity × exposure time)

for erasure is 15 W · sec/cm2.

Mode Description

Device Identifier Mode

Programming condition of EPROM is various according to EPROM manufacturers and device types. It may

cause miss operation. To countermeasure it, some EPROMs provide maker identifier code. Users can write

EPROM by reading out write condition coded before shipped. Some commercial programmers can set write

condition by recognizing this code. This function enables effective program. Regarding commercial

programmers that can recognize this device’s identifier code, please contact programmer maker.

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