1997 Apr 02 3
Philips Semiconductors Product specification
128 × 8-bit EEPROM with I
2
C-bus interface
PCA8581; PCA8581C
1 FEATURES
• Operating supply voltage:
– 4.5 to 5.5 V (PCA8581)
– 2.5 to 6.0 V (PCA8581C)
• Integrated voltage multiplier and timer for writing
(no external components required)
• Automatic erase before write
• Low standby current; maximum 10 µA
• 8-byte page write mode
• Serial input/output bus (I
2
C-bus)
• Address by 3 hardware address pins
• Automatic word address incrementing
• Designed for minimum 10000 write cycles per byte
• 10 years minimum non-volatile data retention
• Infinite number of read cycles
• Pin and address compatibility to PCF8570C and
PCF8582
• Operating ambient temperature: −25 to +85 °C.
2 GENERAL DESCRIPTION
The PCA8581 and PCA8581C are low power CMOS
EEPROMs with standard and wide operating voltages:
4.5 to 5.5 V (PCA8581)
2.5 to 6.0 V (PCA8581C).
In the following text, the generic term ‘PCA8581’ is used to
refer to both types in all packages except when otherwise
specified.
The PCA8581 is organized as 128 words of 8-bytes.
Addresses and data are transferred serially via a two-line
bidirectional bus (I
2
C-bus). The built-in word address
register is incremented automatically after each written or
read data byte. All bytes can be read in a single operation.
Up to 8 bytes can be written in one operation, reducing the
total write time per 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.
3 QUICK REFERENCE DATA
4 ORDERING INFORMATION
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
DD
supply voltage
PCA8581 4.5 5.5 V
PCA8581C 2.5 6.0 V
I
DD
supply current (standby) f
SCL
= 0 Hz − 10 µA
T
amb
operating ambient temperature −25 +85 °C
T
stg
storage temperature without EEPROM retention −65 +150 °C
with EEPROM retention −65 +85 °C
TYPE
NUMBER
PACKAGE
NAME DESCRIPTION VERSION
PCA8581P DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
PCA8581CP DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
PCA8581T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1
PCA8581CT SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1
