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All data sheets are subject to change without notice

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256K (32K x 8-Bit) OTP EPROM

27C256T

©2003 Maxwell Technologies

All rights reserved.

06.24.02 REV 4

• 32K x 8-bit OTP EPROM organization

radiation

• Total dose hardness:

- > 100 Krad (Si), depending upon space mission

• Excellent Single Event Effects:

-SEL

-SEU

• Package:

• Fast access time:

- 120, 150, 200 ns (max)

• Low power dissipation:

- Active mode: 100 mW/MHz (typ)

- Standby mode: 10 µ W (typ)

Page programming time: 14 sec (typ)

• Programming power supply:

- V

• One-time programmable

• Pin arrangement

- JEDEC standard byte-wide EPROM

- Flash memory and mask ROM compatible

Maxwell Technologies’ 27C256T high density 256-Kilobit one-

time programmable electrically programmable read only mem-

ory microcircuit features a greater than 100 krad (Si) total

dose tolerance, depending upon space mission. The 27C256T

features fast address times and low power dissipation. The

27C256T offers high speed programming using page pro-

gramming mode.

ogy incorporates radiation shielding in the microcircuit pack-

age. It eliminates the need for box shielding while providing

the required radiation shielding for a lifetime in orbit or space

krad (Si) radiation dose tolerance. This product is available

with screening up to Class S.

x-Decoder

1024 x 1022

Memory Matrix

Input

Data

Control

Y- Gating

Y - Decoder

H

A0-A4

A10-A11

OE

PGM

A5-A9

V

CC

V

PP

V

SS

A12-A16

I/O0

I/O15

H

CE

: High Threshhold Inverter

Logic Diagram

27C256T

NC

I/O 7

A12-A14