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Philips Semiconductors
256 × 8-bit static low-voltage RAM with
I 2 C-bus interface
Product speci?cation
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 μ A
? Power-saving mode; typical 50 nA
? Serial input/output bus (I 2 C-bus)
3
GENERAL DESCRIPTION
? Address by 3 hardware address pins
? Automatic word address incrementing
? Available in DIP8 and SO8 packages.
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
bidirectional bus (I 2 C-bus). The built-in word address
2
APPLICATIONS
register is incremented automatically after each written or
read data byte. Three address pins, A0, A1 and A2 are
? 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.
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
SYMBOL
V DD
I DD
I DDR
T amb
T stg
PARAMETER
supply voltage
supply current (standby)
supply current (power-saving mode)
operating ambient temperature
storage temperature
CONDITIONS
f SCL = 0 Hz
T amb = 25 ° C
MIN.
2.5
?
?
? 40
? 65
MAX.
6.0
15
400
+85
+150
UNIT
μ A
nA
° C
° C
5
ORDERING INFORMATION
TYPE
PACKAGE
NUMBER
PCF8570P
PCF8570T
1999 Jan 06
NAME
DIP8
SO8
DESCRIPTION
plastic dual in-line package; 8 leads (300 mil)
plastic small outline package; 8 leads; body width 7.5 mm
3
VERSION
SOT97-1
SOT176-1
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