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ST24LC21M1TR Datasheet

  • ST24LC21M1TR

  • 1Kb x8 DUAL MODE SERIAL EEPROM for VESA Plug&Play

  • 18頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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ST24LC21
1Kb (x8) DUAL MODE SERIAL EEPROM
for VESA Plug&Play
NOT FOR NEW DESIGN
1 MILLION ERASE/WRITE CYCLES
40 YEARS DATA RETENTION
2.5V to 5.5V SINGLE SUPPLY VOLTAGE
400k Hz COMPATIBILITY OVER the FULL
RANGE of SUPPLY VOLTAGE
TWO WIRE SERIAL INTERFACE I
2
C BUS
COMPATIBLE
PAGE WRITE (up to 8 BYTES)
BYTE, RANDOM and SEQUENTIAL READ
MODES
SELF TIMED PROGRAMMING CYCLE
AUTOMATIC ADDRESS INCREMENTING
ENHANCED ESD/LATCH UP
PERFORMANCES
ST24LC21 is replaced by the ST24LC21B
8
1
PSDIP8 (B)
0.25mm Frame
8
1
SO8 (M)
Figure 1. Logic Diagram
DESCRIPTION
The ST24LC21 is a 1K bit electrically erasable
programmable memory (EEPROM), organized by
8 bits.This device can operate in two modes: Trans-
mit Only mode and I
2
C bidirectional mode. When
powered, the device is in Transmit Only mode with
EEPROM data clocked out from the rising edge of
the signal applied on VCLK.
The device will switch to the I
2
C bidirectional mode
upon the falling edge of the signal applied on SCL
pin. The ST24LC21 cannot switch from the I
2
C
bidirectional mode to the Transmit Only mode (ex-
cept when the power supply is removed). The
device operates with a power supply value as low
as 2.5V. Both Plastic Dual-in-Line and Plastic Small
Outline packages are available.
VCC
SCL
ST24LC21
VCLK
SDA
Table 1. Signal Names
SDA
SCL
V
CC
V
SS
VCLK
Serial Data Address Input/Output
Serial Clock (I
2
C mode)
Supply Voltage
Ground
Clock Transmit only mode
VSS
AI01489
June 1997
This is information on a product still in production but not recommended for new designs.
1/18

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