HN27C256HFP Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HN27C256HFP

32768-word × 8-bit CMOS One Time Electrically Programmable ROM

Hitachi -> Renesas Electronics 

HN27C256HP/HFP Series

High Performance Programming Timing Waveform

Address

Data

VPP

VPP

VCC

VCC

VCC + 1

VCC

Program

tAS

Data In Stable

tDS

tDH

tVPS

tVCS

Program Verify

tAH

Data Out Valid

tDF

CE

OE

Mode Description

tPW

tOES

tOE

Device Identifier Mode

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

may cause miss operation. To countermeasure it, some OTPROMs provide maker identifier code. Users can

write OTPROM 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.

A0 I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 I/O0

Identifier

(10) (19) (18) (17) (16) (15) (13) (12) (11) Hex Data

Manufacturer code VIL

0

0

0

0

0

1

1

1

07

Device code

VIH

0

0

1

1

0

0

0

1

31

Notes: 1. A9 = 12.0 V ± 0.5 V.

2. A1 – A8, A10 – A14, CE, OE = VIL.

14

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