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X25045PI Datasheet(PDF) 2 Page - Xicor Inc. |
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X25045PI Datasheet(HTML) 2 Page - Xicor Inc. |
2 / 15 page X25043/45 2 PIN DESCRIPTIONS Serial Output (SO) SO is a push/pull serial data output pin. During a read cycle, data is shifted out on this pin. Data is clocked out by the falling edge of the serial clock. Serial Input (SI) SI is the serial data input pin. All opcodes, byte ad- dresses, and data to be written to the memory are input on this pin. Data is latched by the rising edge of the serial clock. Serial Clock (SCK) The Serial Clock controls the serial bus timing for data input and output. Opcodes, addresses, or data present on the SI pin is latched on the rising edge of the clock input, while data on the SO pin changes after the falling edge of the clock input. Chip Select ( CS) When CS is HIGH, the X25043/45 is deselected and the SO output pin is at high impedance and, unless an internal write operation is underway, the X25043/45 will be in the standby power mode. CS LOW enables the X25043/45, placing it in the active power mode. It should be noted that after power-up, a HIGH to LOW transition on CS is required prior to the start of any operation. Write Protect ( WP) When WP is LOW, nonvolatile writes to the X25043/45 are disabled, but the part otherwise functions normally. When WP is held HIGH, all functions, including nonvola- tile writes operate normally. WP going LOW while CS is still LOW will interrupt a write to the X25043/45. If the internal write cycle has already been initiated, WP going LOW will have no affect on a write. Reset ( RESET, RESET) X25043/45, RESET/RESET is an active LOW/HIGH, open drain output which goes active whenever VCC falls below the mimimum VCC sense level. It will remain active until VCC rises above the minimum VCC sense level for 200ms. RESET/RESET also goes active if the Watchdog timer is enabled and CS remains either HIGH or LOW longer than the Watchdog time-out period. A falling edge of CS will reset the watchdog timer. PIN NAMES Symbol Description CS Chip Select Input SO Serial Output SI Serial Input SCK Serial Clock Input WP Write Protect Input VSS Ground VCC Supply Voltage RESET/RESET Reset Output 3844 PGM T01.1 PIN CONFIGURATION 3844 ILL F02.3 CS SO WP VSS 1 2 3 4 8 7 6 5 VCC RESET/RESET SCK SI 8-LEAD DIP/SOIC X25043/45 14-LEAD TSSOP X25043/45 CS SO NC NC NC WP VSS VCC RESET/RESET NC NC NC SCK SI 14 13 12 11 10 9 8 1 2 3 4 5 6 7 |
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