1999 Jan 06

3

Philips Semiconductors

Product specification

256

× 8-bit static low-voltage RAM with

PCF8570

1

FEATURES

• Operating supply voltage 2.5 to 6.0 V

• Low data retention voltage; minimum 1.0 V

• Low standby current; maximum 15 µA

• Power-saving mode; typical 50 nA

• Address by 3 hardware address pins

• Automatic word address incrementing

• Available in DIP8 and SO8 packages.

2

APPLICATIONS

• Telephony:

– RAM expansion for stored numbers in repertory

dialling (e.g. PCD33xxA applications)

• General purpose RAM for applications requiring

extremely low current and low-voltage RAM retention,

such as battery or capacitor-backed.

• Radio, television and video cassette recorder:

– channel presets

• General purpose:

– RAM expansion for the microcontroller families

PCD33xxA, PCF84CxxxA, P80CLxxx and most other

microcontrollers.

3

GENERAL DESCRIPTION

The PCF8570 is a low power static CMOS RAM,

organized as 256 words by 8-bits.

Addresses and data are transferred serially via a two-line

register is incremented automatically after each written or

read data byte. Three address pins, A0, A1 and A2 are

used to define the hardware address, allowing the use of

up to 8 devices connected to the bus without additional

hardware.

4

QUICK REFERENCE DATA

5

ORDERING INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage

2.5

6.0

supply current (standby)

−

15

µA

supply current (power-saving mode)

−

400

nA

operating ambient temperature

−40

+85

°C

storage temperature

−65

+150

°C

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCF8570P

DIP8

plastic dual in-line package; 8 leads (300 mil)

SOT97-1

PCF8570T

SO8

plastic small outline package; 8 leads; body width 7.5 mm

SOT176-1