描述 Description

The TC55257BPI is a 262,144 bit CMOS static random access memory organized as 32,768 words by 8 bits and operated from a

single 5V power supply. Advanced circuit techniques provide both high speed and low power features with an operating current of

5mA/MHz (typ.) and a minimum cycle time of 100ns.

When CE is a logical high, the device is placed in a low power standby mode in which the standby current is 2uA at room tem-

perature. The TC55257BPI has two control inputs. Chip enable (CE) allows for device selection and data retention control, while an

output enable input (OE) provides fast memory access. The TC55257BPI is suitable for use in microprocessor systems where high

speed, low power, and battery backup are required. The TC55257BPI has an operating temperature range of -40 - 85°C so it is

suitable for use in wide operating temperature systems.

The TC55257BPI is offered in a standard dual-in-line 28-pin plastic package (0.6/0.3 inch width), a small outline plastic pack-

age, and a thin small outline plastic package (forward type, reverse type).

特性 Features

? Low power

? Standby current:

Single 5V power supply

? Access time (max.)

dissipation:

Access Time

Chip Enable

Access Time

Output Enable Time

27.5mW/MHz (typ.)

2μA at Ta = 25°C (max.)

TC55257BPI/BFI/BSPI/BFTI/BTRI-10L

100ns

100ns

50ns

? Power down feature:

CE

? Data retention supply voltage:

Wide operating temperature:

? Inputs and outputs TTL compatible

? Package

TC55257BPI

: DIP28-P-600

TC55257BFI

TC55257BSPI

: SOP28-P-450

: DIP28-P-300B

: TSOP28-P

TC55257BFTI

TC55257BTRI : TSOP28-P-A

2.0-5.5V

-40 - 85°C