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This 5-Pin bi-directional transient suppressor array is designed for applications requiring 
transient overvoltage protection capability. It is intended for use in transient voltage and 
ESD sensitive equipment such as computers, printers, cell phones, medical equipment, 
and  other applications.  Its  integrated  design  provides  bi-directional  protection for  four 
separate lines using a single TSOP-5 package. This device is ideal for situations where 
board space is a premium.

 Bi-directional Protection for Four Lines in a Single TSOP-5 Package

 Low Leakage Current

 Low Capacitance

 Provides ESD Protection for JEDEC Standards JESD22

 Machine Model = Class C

 Human Body Model = Class 3B

 Provides ESD Protection for IEC 61000-4-2, 15 kV (Air), 8 kV (Contact)

 This is a Pb-Free Device

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 I2C 
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 I2C bidirectional mode upon the falling edge of the signal applied on SCL
pin. The ST24LC21 cannot switch from the I2C 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.

 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 I2C 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

Low-power JFET-input operational amplifier

 Very Low Power Consumption

 Typical Supply Current . . . 200 µA (Per Amplifier)

 Wide Common-Mode and Differential Voltage Ranges

 Low Input Bias and Offset Currents

 Common-Mode Input Voltage Range Includes VCC+

 Output Short-Circuit Protection

 High Input Impedance . . . JFET-Input Stage

 Internal Frequency Compensation

 Latch-Up-Free Operation

 High Slew Rate . . . 3.5 V/µs Typ