HT27LC020 Просмотр технического описания (PDF) - Holtek Semiconductor

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HT27LC020

CMOS 256K x
8-Bit OTP EPROM

Holtek Semiconductor 

HT27LC020

CMOS 256K´8-Bit OTP EPROM

Features

· Operating voltage: +3.3V

· Programming voltage

- VPP=12.5V±0.2V

- VCC=6.0V±0.2V

· High-reliability CMOS technology

· Latch-up immunity to 100mA from -1.0V to

VCC+1.0V

· CMOS and TTL compatible I/O

· Low power consumption

- Active: 15mA max.

- Standby: 1mA typ.

· 256K´8-bit organization

· Fast read access time: 90ns

· Fast programming algorithm

· Programming time 75ms typ.

· Two line controls (OE and CE)

· Standard product identification code

· Commercial temperature ranges (0°C to +70°C)

· 32-pin DIP/SOP/TSOP/PLCC package

General Description

The HT27LC020 chip family is a low-power, 2048K

(2,097,152) bit, +3.3V electrically one-time programma-

ble (OTP) read-only memories (EPROM). Organized

into 256K words with 8 bits per word, it features a fast

single address location programming, typically at 75ms

per byte. Any byte can be accessed in less than 90ns

Block Diagram

with respect to Spec. This eliminates the need for WAIT

states in high-performance microprocessor systems.

The HT27LC020 has separate Output Enable (OE) and

Chip Enable (CE) controls which eliminate bus conten-

tion issues.

R ow

A d d re s s

C o lu m n

A d d re s s

CE

OE

PG M

X -D e c o d e r

Y -D e c o d e r

CE & OE &

PG M & TEST

C o n tr o l L o g ic

C e ll A r r a y

Y - G a tin g

SA CKT

&

O u tp u t B u ffe r

VCC

GND

VPP

D Q 0~D Q 7

Rev. 1.50

1

December 8, 2003

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