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11.4. ST24LC21
11.4.1. Description
The ST24LC21 is a 1K bit electrically erasable programmable memory (EEPROM), organized by 8 bits.
This device can operate in two modes: Transmit Only mode and I
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
applied on SCL pin. The ST24LC21 can not switch from the I
mode (except 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.
11.4.2. Features
• 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
• Page Write (Up To 8 Bytes)
• Byte, random and sequential read modes
• Self timed programming cycle
• Automatic address incrementing
• Enhanced ESD/Latch up
• Performances
11.4.3. Pin connections
DIP Pin connections
NC: Not connected
Signal names
SDA
Serial data Address Input/Output
SCL
Serial Clock (I
V
Supply voltage
cc
V
Ground
ss
VCLK
Clock transmit only mode
17" TFT TV Service Manual
2
C bus compatible
2
C mode)
C bidirectional mode. When powered,
2
2
C bidirectional mode upon the falling edge of the signal
2
C bidirectional mode to the Transmit Only
CO Pin connections
7
21/09/2004
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