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X25020S-3 Datasheet(PDF) 2 Page - Xicor Inc. |
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X25020S-3 Datasheet(HTML) 2 Page - Xicor Inc. |
2 / 14 page X25020 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 are latched on the rising edge of the clock input, while data on the SO pin change after the falling edge of the clock input. Chip Select ( CS) When CS is HIGH, the X25020 is deselected and the SO output pin is at high impedance and unless an internal write operation is underway, the X25020 will be in the standby power mode. CS LOW enables the X25020, 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 X25020 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 X25020. If the internal write cycle has already been initiated, WP going LOW will have no affect on a write. Hold ( HOLD) HOLD is used in conjunction with the CS pin to select the device. Once the part is selected and a serial sequence is underway, HOLD may be used to pause the serial communication with the controller without resetting the serial sequence. To pause, HOLD must be brought LOW while SCK is LOW. To resume communication, HOLD is brought HIGH, again while SCK is LOW. If the pause feature is not used, HOLD should be held HIGH at all times. 3834 FHD F02.1 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 HOLD Hold Input 3834 PGM T01.1 PIN CONFIGURATION CS SO WP VSS 1 2 3 4 8 7 6 5 VCC HOLD SCK SI X25020 DIP/SOIC |
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