12.24. ST24LC21
12.24.1. Description
The ST24LC21 is a 1K bit electrically erasable programmable memory (EEPROM), organized by 8 bits.
2
This device can operate in two modes: Transmit Only mode and IC bidirectional mode. When powered,
the device is in Transmit Only mode with EEPROM data clocked out from the rising edge of the signal
2
applied on VCLK. The device will switch to the IC bidirectional mode upon the falling edge of the signal
2
applied on SCL pin. The ST24LC21 can not switch from the IC bidirectional mode to the Transmit Only
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.
12.24.2. 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
2
? Two wire serial interface IC 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
12.24.3. Pin connections
DIP Pin connections CO Pin connections
NC: Not connected
Signal names
SDA Serial data Address Input/Output
2
SCL Serial Clock (IC mode)
Vcc Supply voltage
Vss Ground
VCLK Clock transmit only mode
12.25. LM2576
12.25.1. General Description
The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and
convenient design of a step-down switching regulator (buck converter). All circuits of this series are
capable of driving a 3.0 A load with excellent line and load regulation.
These devices are available in fixed output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable
output version. These regulators were designed to minimize the number of external components to
simplify the power supply design. Standard series of inductors optimized for use with the LM2576 are
offered by several different inductor manufacturers.
Since the LM2576 converter is a switch-mode power supply, its efficiency is significantly higher in
comparison with popular three-terminal linear regulators, especially with higher input voltages. In many
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Plasma TV Service Manual 04/08/2005 |
ACEC
