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1 / 13 page AM24LC21B Dual Mode, 1K-bits (128 x 8) 2-Wire Serial EEPROM (Preliminary) This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev. 0.1 Jul 2, 2003 1/13 Features - Single supply with operation down to 2.5V - Completely implements DDC1/DDC2 interface for monitor identification, including recovery to DDC1 - Low power CMOS technology - 1 mA typical active current - 10 uA standby current typical at 5.5V - 2-wire serial interface bus, I 2C compatible - 100Khz (2.5V) and 400Khz (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 - Data retention > 40 years - 8-pin PDIP and SOP packages - Available for extended temperature ranges Commercial (C): 0°C to +70°C Industrial (I): -40°C to +85°C Pin Assignments NC NC VSS VCC SCL VCLK SDA 1 3 2 4 8 6 7 5 NC NC VSS VCC SCL VCLK SDA 1 3 2 4 8 6 7 5 PDIP Package SOP Package NC NC (Top View) (Top View) General Description The AM24LC21B 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 information. Two modes of operation have been implemented: transmit only mode and bi-directional mode. Upon power-up, the device will be in the transmit only mode, sending a serial bit stream of the memory array contents, clocked by the VCLK pin. A valid high to low transition on the SCL pin will cause the device to enter the bi-directional mode, with byte selectable read/write capability of the memory array. The AM24LC21B is available in a standard 8-pin PDIP and SOP package in both commercial and industrial temperature ranges. The difference between AM24LC21 and AM24LC21B is the former has Write protection function and the latter doesn’t have write protection function. Pin Descriptions Name Description NC No connection VSS Ground SDA Serial address/data I/O VCLK Serial clock (transmit only mode) VCC Power supply SCL Serial clock (bi-directional mode) Note. See pin descriptions (continued) at page 11/13 for more detailed Ordering Information Type Package 1K Dual Mode S : SOP-8L N : PDIP-8L Temp. grade AM24LC 21B X X X Packing Blank : Tube A : Taping Operating Voltage LC : 2.5V~5.5V,CMOS Blank : C 70 ~ C 0 o o + I : C 85 ~ C 40 o o + − |
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