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24LCS21AT/SN 1K 2.5V Dual Mode I2C™ Serial EEPROM
Features:
• Single Supply with Operation Down to 2.5V
• Completely Implements DDC1™/DDC2™ Inter-face for Monitor Identification, Including Recovery
to DDC1
• Low-Power CMOS Technology:
- 1 mA active current, typical
-10 μA standby current, typical at 5.5V
• 2-Wire Serial Interface Bus, I2C™ Compatible
• 100 kHz (2.5V) and 400 kHz (5V) Compatibility
• Self-Timed Write Cycle (including Auto-Erase)
• Hardware Write-Protect Pin
• Page Write Buffer for up to Eight Bytes
• 1,000,000 Erase/Write Cycles Ensured
• Data Retention > 200 years
• ESD Protection > 4000V
• 8-pin PDIP and SOIC Package
• Available for Extended Temperature Ranges:
- Industrial (I): -40°C to +70°C
• Pb-Free and RoHS Compliant
Description:
The Microchip Technology Inc. 24LCS21A is a 128 x 8-bit dual-mode Electrically Erasable PROM.
This device is designed for use in applications requiring storage and serial transmission of configura-tion and control information. Two modes of operation have been implemented: Transmit-Only mode and Bidirectional mode. Upon power-up, the device will be in the Transmit-Only mode, sending a serial bit stream of the memory array from 00h to 7Fh, clocked by the VCLK pin. A valid high-to-low transition on the SCL pin will cause the device to enter the Transition mode and look for a valid control byte on the I2C bus. If it detects a valid control byte from the master, it will switch into Bidirectional mode, with byte selectable read/write capability of the memory array using SCL.
If no control byte is received, the device will revert to the Transmit-Only mode after it receives 128 consec-utive VCLK pulses while the SCL pin is idle. The 24LCS21A also enables the user to write-protect the entire memory array using its write-protect pin. The 24LCS21A is available in a standard 8-pin PDIP and SOIC package in industrial temperature range.
