AM27X256 查看數據表（PDF） - Advanced Micro Devices

零件编号

产品描述 (功能)

生产厂家

AM27X256

256 Kilobit (32 K x 8-Bit) CMOS ExpressROM Device

Advanced Micro Devices 

FINAL

Am27X256

256 Kilobit (32 K x 8-Bit) CMOS ExpressROM Device

DISTINCTIVE CHARACTERISTICS

s As an OTP EPROM alternative:

— Factory optimized programming

— Fully tested and guaranteed

s As a Mask ROM alternative:

— Shorter leadtime

— Lower volume per code

s Fast access time

— 55 ns

s Single +5 V power supply

s Compatible with JEDEC-approved EPROM

pinout

s ±10% power supply tolerance

s High noise immunity

s Low power dissipation

— 20 µA maximum CMOS standby current

s Available in Plastic Dual-In-line Package (PDIP)

and Plastic Leaded Chip Carrier (PLCC)

s Latch-up protected to 100 mA from –1 V to

VCC + 1 V

s Versatile features for simple interfacing

— Both CMOS and TTL input/output compatibility

— Two line control functions

GENERAL DESCRIPTION

The Am27X256 is a factory programmed and tested

OTP EPROM. It is programmed after packaging prior to

final test. Every device is rigorously tested under AC

and DC operating conditions to your stable code. It is

organized as 32 Kwords by 8 bits per word and is avail-

able in plastic dual in-line packages (PDIP), as well as

plastic leaded chip carrier (PLCC) packages. Express-

ROM devices provide a board-ready memory solution

for medium to high volume codes with short leadtimes.

This offers manufacturers a cost-effective and flexible

alternative to OTP EPROMs and mask programmed

ROMs.

Data can be accessed as fast as 55 ns, allowing

high-performance microprocessors to operate with re-

duced WAIT states. The device offers separate Output

Enable (OE#) and Chip Enable (CE#) controls, thus

eliminating bus contention in a multiple bus micropro-

cessor system.

AMD’s CMOS process technology provides high

speed, low power, and high noise immunity. Typical

power consumption is only 80 mW in active mode, and

100 µW in standby mode.

BLOCK DIAGRAM

OE#

CE#

A0–A14

Address

Inputs

VCC

VSS

Output Enable

Chip Enable

and

Prog Logic

Y

Decoder

X

Decoder

Data Outputs DQ0–DQ7

Output

Buffers

Y

Gating

262,144

Bit Cell

Matrix

12082F-1

Publication# 12082 Rev: F Amendment/0

Issue Date: May 1998

Share Link: