24C01A/02A/04A
1K/2K/4K 5.0V CMOS Serial EEPROMs
FEATURES
PACKAGE TYPE
DIP
• Low power CMOS technology
• Hardware write protect
A0
A1
1
8
7
6
5
VCC
WP*
SCL
SDA
• Two wire serial interface bus, I2C compatible
24C01A
24C02A
24C04A
2
3
4
• 5 volt only operation
• Self-timed write cycle (including auto-erase)
• Page-write buffer
A2
• 1ms write cycle time for single byte
• 1,000,000 ERASE/WRITE cycles guaranteed
• Data retention >200 years
VSS
8-lead
SOIC
1
2
3
4
8
• 8-pin DIP/SOIC packages
VCC
A0
• Available for extended temperature ranges:
- Commercial: 0˚C to +70˚C
24C01A
24C02A
24C04A
7
6
5
WP*
SCL
SDA
A1
- Industrial:
-40˚C to +85˚C
A2
- Automotive: -40˚C to +125˚C
VSS
DESCRIPTION
14-lead
SOIC
The Microchip Technology Inc. 24C01A/02A/04A is a
1K/2K/4K bit Electrically Erasable PROM. The device
is organized as shown, with a standard two wire serial
interface. Advanced CMOS technology allows a signif-
icant reduction in power over NMOS serial devices. A
special feature in the 24C02A and 24C04A provides
hardware write protection for the upper half of the
block. The 24C01A and 24C02A have a page write
capability of two bytes and the 24C04A has a page
length of eight bytes. Up to eight 24C01A or 24C02A
devices and up to four 24C04A devices may be con-
nected to the same two wire bus.
14
1
2
3
4
5
6
7
NC
NC
A0
13
12
11
VCC
WP
NC
24C01A
24C02A
24C04A
A1
NC
10
9
SCL
SDA
NC
A2
VSS
NC
8
* “TEST” pin in 24C01A
This device offers fast (1ms) byte write and
extended (-40°C to 125°C) temperature operation. It
is recommended that all other applications use
Microchip’s 24LCXXB.
BLOCK DIAGRAM
Data
VCC
VPP
R/W Amp
24C01A
24C02A
24C04A
Buffer
VSS
(FIF0)
Organization
Write Protect
128 x 8
None
258 x 8
080-0FF
2 Bytes
2 x 256 x 8
100-1FF
8 Bytes
Data Reg.
A P
d o
d i
r n
e t
s e
s r
Memory
Array
SDA
Page Write
Buffer
2 Bytes
Slave Addr.
A0 to
A7
Control
Logic
Increment
SCL
A8
A0 A1 A2 WP
2
I C is a trademark of Phillips Corporation
1995 Microchip Technology Inc.
DS11183C-page 1