AM24LC21
Dual Mode, 1K-bits (128 x 8) 2-Wire Serial EEPROM
(Preliminary)


This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 0.0 Aug 10, 2002
1/13

null Features

- Single supply with operation down to 2.5V
- Completely implements DDC1/DDC2 interface for
monitor identification, including recovery to DDC1
- Low power CMOS technology
- 1 mA typical active current
- 10 uA standby current typical at 5.5V
- 2-wire serial interface bus, I
2
C compatible
- 100Khz (2.5V) and 400Khz (5V) compatibility
- Self-timed write cycle (including auto-erase)
- Hardware write-protect pin
- Page-write buffer for up to eight bytes
- 1,000,000 erase/write cycles
- Data retention > 40 years
- 8-pin PDIP and SOP packages
- Available for extended temperature ranges
Commercial (C): 0°C to +70°C
Industrial (I): -40°C to +85°C



null Pin Assignments

NC
NC
VSS
VCC
SCL
VCLK
SDA
1
3
2
4
8
6
7
5
NC
NC
VSS
VCC
SCL
VCLK
SDA
1
3
2
4
8
6
7
5
PDIP Package SOP Package
WP WP
(Top View) (Top View)



null General Description

The AM24LC21 is a 128 x 8-bit dual-mode
Electrically Erasable PROM. This device is
designed for use in applications requiring storage
and serial transmission of configuration and control
information. Two modes of operation have been
implemented: transmit only mode and bi-directional
mode. Upon power-up, the device will be in the
transmit only mode, sending a serial bit stream of
the memory array contents, clocked by the VCLK
pin. A valid high to low transition on the SCL pin will
cause the device to enter the bi-directional mode,
with byte selectable read/write capability of the
memory array. The AM24LC21 is available in a
standard 8-pin PDIP and SOP package in both
commercial and industrial temperature ranges.





null Pin Descriptions

Name Description
NC No connection
VSS Ground
SDA Serial address/data I/O
VCLK Serial clock (transmit only mode)
VCC Power supply
SCL Serial clock (bi-directional mode)
WP
Write protect (active low)
Note. See pin description (continued) for more detailed

null Ordering Information


Type Package
1K Dual Mode
S : SOP-8L
N : PDIP-8L
Temp. grade
AM24LC 21 X X X
Packing
Blank : Tube
A : Taping
Operating Voltage
LC : 2.5V~5.5V,CMOS
Blank : C70~C0
oo
+
I :
C85~C40
oo
+−