STMicroelectronics ST24LC21
ST24LC21 is replaced by the ST24LC21B 8 1 PSDIP8 (B) 0.25mm Frame 8 1 SO8 (M) Figure 1. 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.| Part No. | ST24LC21 |
|---|---|
| Datasheet | ST24LC21 Download |
| Manufacturer |  STMicroelectronics |
| Description | 1Kb x8 DUAL MODE SERIAL EEPROM |
| Buy | Stock & Price |
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 I2C bidirectional mode. 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. VCC SCL ST24LC21 VCLK SDA Table 1. Signal Names SDA SCL VCC VSS VCLK Serial Data Address Input/Output Serial Clock (I C mode) Supply Voltage Ground Clock Transmit only mode 2 VSS AI01489 June 1997 This is information on a product still in production but not recommended for new designs. 1/18 ST24LC21 Figure 2A. DIP Pin Connections Figure 2B. SO Pin Connections ST24LC21 NC NC NC VSS 1 2 3 4 8 7 6 5 AI01499 ST24LC21 VCC VCLK SCL SDA NC NC NC VSS 1 2 3 4 8 7 6 5 AI01500 VCC VCLK SCL SDA Warning: NC = Not Connected Warning: NC = Not Connected Table 2.
