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24LC21AT-I/P Datasheet(PDF) 1 Page - Microchip Technology |
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24LC21AT-I/P Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 26 page  © 2008 Microchip Technology Inc. DS21160G-page 1 24LC21A Features: • Single Supply with Operation Down to 2.5V • Completely Implements DDC1™/DDC2™ Interface for Monitor Identification, Including Recovery to DDC1 • Pin and Function Compatible with 24LC21 • Low-Power CMOS Technology - 1 mA typical active current -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) • 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 • Pb-Free and RoHS Compliant Description: The Microchip Technology Inc. 24LC21A 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 configuration and control informa- tion. 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 consecutive VCLK pulses while the SCL pin is idle. The 24LC21A is available in a standard 8-pin PDIP and SOIC package in industrial temperature range. Package Types Block Diagram Pin Function Table - Industrial (I): -40°C to +85°C Name Function VSS Ground SDA Serial Address/Data I/O SCL Serial Clock (Bidirectional mode) VCLK Serial Clock (Transmit-Only mode) VCC +2.5V to 5.5V Power Supply NC No Connection PDIP SOIC NC NC NC VSS 1 2 3 4 8 7 6 5 Vcc VCLK SCL SDA NC NC NC Vss 1 2 3 4 8 7 6 5 Vcc VCLK SCL SDA I/O Control Logic HV Generator EEPROM Array Page Latches YDEC XDEC Sense AMP R/W Control Memory Control Logic SDA SCL VCC VSS VCLK 1K 2.5V Dual Mode I2C™ Serial EEPROM DDC is a trademark of the Video Electronics Standards Association. I2C is a trademark of Philips Corporation. |
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