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IS93C46A Datasheet(PDF) 2 Page - Integrated Silicon Solution, Inc |
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IS93C46A Datasheet(HTML) 2 Page - Integrated Silicon Solution, Inc |
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2 / 13 page  2 Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774 Rev. E 06/07/04 IS93C46A ISSI® PIN CONFIGURATIONS 8-Pin JEDEC SOIC “G” 8-Pin JEDEC SOIC “GR” PIN DESCRIPTIONS CS Chip Select SK Serial Data Clock DIN Serial Data Input DOUT Serial Data Output ORG Organization Select NC Not Connected Vcc Power GND Ground instruction begins with a start bit of the logical “1” or HIGH. Following this are the opcode (2 bits), address field (6 or 7 bits), and data, if appropriate. The clock signal may be held stable at any moment to suspend the device at its last state, allowing clock- speed flexibility. Upon completion of bus communication, CS would be pulled LOW. The device then would enter Standby mode if no internal programming is underway. Read (READ) The READ instruction is the only instruction that outputs serial data on the DOUT pin. After the read instruction and address have been decoded, data is transferred from the selected memory register into a serial shift register. (Please note that one logical “0” bit precedes the actual 8 or 16-bit output data string.) The output on DOUT changes during the low-to-high transitions of SK (see Figure 3). Low Voltage Read The IS93C46A has been designed to ensure that data read operations are reliable in low voltage environments. They provide accurate operation with Vcc as low as 2.5V. Auto Increment Read Operations In the interest of memory transfer operation applications, the IS93C46A has been designed to output a continuous stream of memory content in response to a single read operation instruction. To utilize this function, the system asserts a read instruction specifying a start location ad- dress. Once the 8 or16 bits of the addressed register have been clocked out, the data in consecutively higher address locations is output. The address will wrap around continu- ously with CS HIGH until the chip select (CS) control pin is brought LOW. This allows for single instruction data dumps to be executed with a minimum of firmware overhead. Applications The IS93C46A is very popular in many high-volume applications which require low-power, low-density storage. Applications using this device include industrial controls, networking, and numerous other consumer electronics. Endurance and Data Retention The IS93C46A is designed for applications requiring up to 1M programming cycles (WRITE, WRALL, ERASE and ERAL). It provides 40 years of secure data retention without power after the execution of 1M programming cycles. Device Operations The IS93C46A is controlled by a set of instructions which are clocked-in serially on the Din pin. Before each low-to-high transition of the clock (SK), the CS pin must have already been raised to HIGH, and the Din value must be stable at either LOW or HIGH. Each 1 2 3 4 8 7 6 5 CS SK DIN DOUT VCC NC ORG GND 1 2 3 4 8 7 6 5 NC VCC CS SK ORG GND DOUT DIN 1 2 3 4 8 7 6 5 CS SK DIN DOUT VCC NC ORG GND (Rotated) 8-Pin DIP, 8-Pin TSSOP |
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