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ST24LC21M1TR Folha de dados(PDF) 1 Page - STMicroelectronics |
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ST24LC21M1TR Folha de dados(HTML) 1 Page - STMicroelectronics |
1 / 18 page ST24LC21 1Kb (x8) DUAL MODE SERIAL EEPROM for VESA Plug&Play NOT FOR NEW DESIGN June 1997 1/18 This is information on a product still in production but not recommended for new designs. 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 ST24LC21 is replaced by the ST24LC21B 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 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 (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. AI01489 SDA VCC ST24LC21 VCLK SCL VSS Figure 1. Logic Diagram SDA Serial Data Address Input/Output SCL Serial Clock (I 2C mode) VCC Supply Voltage VSS Ground VCLK Clock Transmit only mode Table 1. Signal Names 8 1 SO8 (M) 8 1 PSDIP8 (B) 0.25mm Frame |
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