24C01A/02A/04A
2
1K/2K/4K 5.0V I C Serial EEPROMs
FEATURES
PACKAGE TYPES
• Low power CMOS technology
• Hardware write protect
• Two wire serial interface bus, I2C compatible
DIP
A0
A1
1
2
8
7
VCC
WP*
• 5.0V only operation
• Self-timed write cycle (including auto-erase)
• Page-write buffer
A2
3
4
6
5
SCL
SDA
VSS
• 1ms write cycle time for single byte
• 1,000,000 Erase/Write cycles guaranteed
• Data retention >200 years
8-lead
SOIC
1
8
• 8-pin DIP/SOIC packages
A0
A1
VCC
• Available for extended temperature ranges
2
3
4
7
6
5
WP*
SCL
SDA
- Commercial (C):
- Industrial (I):
- Automotive (E):
0˚C to +70˚C
-40˚C to +85˚C
-40˚C to +125˚C
A2
DESCRIPTION
VSS
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 connected to the same
two wire bus.
14-lead
SOIC
14
1
NC
NC
A0
13
12
11
2
3
4
5
6
7
VCC
WP
NC
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
Buffer
(FIFO)
24C01A
24C02A
24C04A
Vcc
Vpp
R/W Amp
Vss
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
Page Write
Buffer
2 Bytes
Memory
Array
d
r
i
n
t
SDA
Slave Addr.
A0 to
A7
e
s e
s
r
Control
Logic
Increment
SCL
A8
A0 A1 A2 WP
I2C is a trademark of Philips Corporation.
1996 Microchip Technology Inc.
DS11183D-page 1
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