Philips Configuration
System Management ICs
EEPROM & RAM
I
2
C Serial EEPROM and RAM
Description
The Philips family of I
2
C bus compatible memories comprises RAM,
EEPROM, video memories and Flash memories.
RAM is Random Access Memory
EEPROM is Electrically Erasable Programmable Read Only Memory
Small size serial memories (RAM and EEPROM) are fairly common and widely
used in many different applications. EEPROM is particularly useful in applica-
tions where data retention during power-off is essential. Such applications include
but are not limited to: meter readings, electronic key, product identification
number, serial presence detect (SPD) on DIMMs, etc. A common pinning is
used for these serial memories because their functionality is very similar. The
common pinout was selected to allow interchangeability. EEPROMs store data
(2 Kbits organized in 256 X 8 in the PCF8582C-2 for example), including set
points, temperature, alarms, DIMM information and more, for a guaranteed
minimum storage time of ten years in the absence of power. EEPROMs can
change values up to 1,000,000 times and have an infinite number of read cycles,
while consuming only 10 micro Amperes of current.
RAM
• The PCF8570 is organized as 256 words of 8-bytes.
EEPROMs are particularly useful in applications where data retention
during power-off is essential. Applications include meter readings,
electronic key, product identification number, serial presence
detect (SPD), etc... A common pinning is used for all these
EEPROMs because functionality is very similar.The pinout was
selected to allow interchangeability.
EEPROM
• The PCF8581/8581C is organized as 128 words of 8-bytes.
• The PCF8582C-2 is organized as 256 words of 8-bytes.
• The PCF8594C-2 is organized as 512 words of 8-bytes in two 256
word pages.
• The PCF8598C-2 is organized as 1024 words of 8-bytes in four 256
word pages.
• The PCF85116-3 is organized as 2048 words of 8-bytes in eight 256
word pages.
The PCF8582C-2 is pin and address compatible with the PCF8570 and
PCA8581. The PCF85102C-2 is identical to the PCF8582C-2, with pin 7
(Programming Time Control output) as a no connect, to allow it to be used in
competitors’ sockets, since PTC should be left floating or held at VCC. The
PCF85103C-2 is identical to the PCF8582C-2 except that the fixed I
2
C address
is different, allowing up to eight of each device to be used on the same I
2
C bus.
Addresses and data are transferred serially via a two-wire bi-directional 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.
The 512-byte, 1024-byte and 2048-byte EEPROMs use the programmable
address (Ax or Block #) to either select the slave address or one of the 256 word
pages (e.g., the PCF8594C-2 has two addressable pages with up to four devices
allowed on the same I2C bus while the PCF85116-3 has eight addressable pages
but only one device is allowed on the same I2C bus).
Features
•
•
•
•
Wide voltage range of 2.5 V to 5.5V
1,000,000 write cycles
Infinite number of read cycles
10 year data retention (Minimum)
www.philipslogic.com/i2c
Key Points
•
The I
2
C bus is used to read and write information to
and from the memory
• A wide voltage range minimizes the number of
EEPROMs that need to be stocked
I
2
C Slave Address
1
0
1
0
A2
A1
A0
or
or
or
R/W
Block# Block# Block#
FIXED
PROGRAMMABLE
EEPROM/RAM Features
• Internal non-volatile registers (except PCF8570) with a minimum of
1,000,000 write cycles at Tambient = 22 oC
• Low power CMOS devices
• Non volatile storage from 128x8-bit to 2048x8-bit
• Write operation per byte or per 8-byte page
• Read operation can be sequential or random
• Internal timer for writing operation (no external components required)
• Internal Power On Reset
• High reliability by using redundant EEPROMS cells
• Offered in 8-pin DIP (N) and SO (D) packages
PCA8581/8581(C)
PCF8570/82/94/98/102/116
0
0
1
0
A2
A1
A0
R/W
FIXED
PROGRAMMABLE
PCF85103
EEPROM &
RAM
I
2
C Serial EEPROM and RAM
EEPROM/RAM Operating Characteristics
PCA8581
PCA8581C
Power Supply
Address pins
Nb of block (256 bytes)
Data retention time
Temperature range
Clock frequency
4.5 to 5.5 V
2.5 to 6 V
3
0.5
10 years
-25 to +85ºC
100 kHz
PCF8582C-2
PCF85102C-2
PCF85103C-2
2.5 to 6 V
3
1
10 years
-40 to +85ºC
100 kHz
PCF8594C-2
EEPROM & RAM
PCF8598C-2
PCF85116-3
PCF8570
2.5 to 6 V
2
2
10 years
-40 to +85ºC
100 kHz
2.5 to 6 V
1
4
10 years
-40 to +85ºC
100 kHz
2.7 to 5.5 V
0
8
20 years
-40 to +85ºC
400 kHz
2.5 to 6 V
3
1
N/A
-40 to +85ºC
100 kHz
A0
A1
A2
V
SS
1
2
3
4
8
V
DD
TEST
SCL
SDA
A0
A1
A2
V
SS
1
2
8
7
V
DD
PTC
SCL
SDA
WP
A1
A2
V
SS
1
2
8
7
V
DD
PTC
SCL
SDA
PCA8581
PCA8581C
7
6
5
PCF8582C-2
3
4
6
5
3
4
PCF8594C-2
6
5
128 x 8-bit (1K) EEPROM
256 x 8-bit (2K) EEPROM
512 x 8-bit (4K) EEPROM
The PCF85102C-2 is identical to the PCF8582C-2 except that
the Programming Time Control (PTC) output is not connected
to allow alternate sourcing of other manufacturer’s devices.
WP
n.c
A2
V
SS
1
2
8
7
V
DD
PTC
SCL
SDA
n.c.
n.c.
n.c
V
SS
1
2
The PCF85103C-2 is identical to the PCF8582C-2 except
it has a different fixed I
2
C address allowing up to 8 of each
device on the same I
2
C bus.
8
7
V
DD
WP
SCL
SDA
A0
A1
A2
V
SS
1
2
8
7
V
DD
TEST
SCL
SDA
PCF8598C-2
3
4
6
5
3
4
PCF85116-3
6
5
3
4
PCF8570
6
5
1024 x 8-bit (8K) EEPROM
2048 x 8-bit (16K) EEPROM
256 x 8-bit (2K) RAM
Order Information
Package
DIP
SO
Container
PCA8581(C)
Tube
PCA8581PN
Tube
PCA8581(C)TD
T&R
PCA8581(C)TD-T
PCF8582C-2
PCF8582C2N
PCF8582C2D
PCF8582C2D-T
PCF8594C-2
PCF8594C2N
PCF8594C2D
PCF8594C2D-T
PCF8598C-2
PCF85102C-2
PCF8598C2N
PCF85102C2N
PCF8598C2D
PCF85102C2D
PCF8598C2D-T PCF85102C2D-T
PCF85103C-2
PCF85103C2N
PCF85103C2D
PCF85103C2D-T
PCF85116-3
PCF8570
PCF85116-3N
PCF8570PN
PCF85116-3D
PCF8570TD
PCF85116-3D-T PCF8570TD-T
Philips Semiconductors
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© Koninklijke Philips Electronics N.V. 2001
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Printed in the USA
Date of release: October 2001
Print code: 301683/8k/FP/2pp/1001
Document ordering number: 9397 750 09209
