AM24LC21B

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, I2C 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


Pinout




Specifications

Symbol	Parameter	Rating	Unit
VCC	Voltage with respect to ground	7	V
VSS	All inputs and outputs w.r.t.	-0.6V to Vcc+1	V
TOP	Operating temperature	0 to + 70 (commercial) -40 to +85 (industrial)	°C
TSTG	Storage temperature	-65 to +125	°C

Description

The AM24LC21B is a 128 x 8-bit dual-mode Electrically Erasable PROM. AM24LC21B 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 AM24LC21B is available in a standard 8-pin PDIP and SOP package in both commercial and industrial temperature ranges.

The difference between AM24LC21 and AM24LC21B is the former has Write protection function and the latter doesn't have write protection function.