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25C640 Datasheet(PDF) 1 Page - Microchip Technology |
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25C640 Datasheet(HTML) 1 Page - Microchip Technology |
1 / 12 page © 1997 Microchip Technology Inc. Preliminary DS21223A-page 1 M 25AA640/25LC640/25C640 DEVICE SELECTION TABLE FEATURES • Low power CMOS technology - Write current: 3 mA typical - Read current: 500 µA typical - Standby current: 500 nA typical • 8192 x 8 bit organization • 32 byte page • Write cycle time: 5ms max. • Self-timed ERASE and WRITE cycles • Block write protection - Protect none, 1/4, 1/2, or all of array • Built-in write protection - Power on/off data protection circuitry - Write enable latch - Write protect pin • Sequential read • High reliability - Endurance: 1M cycles (guaranteed) - Data retention: > 200 years - ESD protection: > 4000 V • 8-pin PDIP, SOIC, and TSSOP packages • Temperature ranges supported: DESCRIPTION The Microchip Technology Inc. 25AA640/25LC640/ 25C640 (25xx640*) is a 64K bit serial Electrically Eras- able PROM. The memory is accessed via a simple Serial Peripheral Interface (SPI) compatible serial bus. The bus signals required are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the device is controlled through a chip select (CS) input. Communication to the device can be paused via the hold pin (HOLD). While the device is paused, transi- tions on its inputs will be ignored, with the exception of chip select, allowing the host to service higher priority interrupts. PACKAGE TYPES BLOCK DIAGRAM Part Number VCC Range Max Clock Frequency Temp Ranges 25AA640 1.8-5.5V 1 MHz C,I 25LC640 2.5-5.5V 2 MHz C,I 25C640 4.5-5.5V 3 MHz C,I,E - Commercial: (C) 0 °C to +70°C - Industrial: (I) -40 °C to +85°C - Automotive: (E) (25C640) -40 °C to +125°C TSSOP 1 2 3 4 8 7 6 5 SCK SI VSS WP HOLD VCC CS SO PDIP/SOIC 1 2 3 4 8 7 6 5 VCC HOLD SCK SI CS SO WP VSS SI SO SCK CS HOLD WP Status Register I/O Control Memory Control Logic X Dec HV Generator EEPROM Array Page Latches Y Decoder Sense Amp. R/W Control Logic VCC VSS 64K SPI™ Bus Serial EEPROM *25xx640 is used in this document as a generic part number for the 25AA640/25LC640/25C640 devices. SPI is a trademark of Motorola. |
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