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Q67100-H3759 Datasheet(PDF) 5 Page - Siemens Semiconductor Group |
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Q67100-H3759 Datasheet(HTML) 5 Page - Siemens Semiconductor Group |
5 / 26 page SLx 24C64 Semiconductor Group 5 Preliminary 1998-07-27 Pin Definitions and Functions Pin Description Serial Clock (SCL) The SCL input is used to clock data into the device on the rising edge and to clock data out of the device on the falling edge. Serial Data (SDA) SDA is a bidirectional pin used to transfer addresses, data or control information into the device or to transfer data out of the device. The output is open drain, performing a wired AND function with any number of other open drain or open collector devices. The SDA bus requires a pull-up resistor to V CC. Chip Select (CS0, CS1, CS2) The CS0, CS1 and CS2 pins are chip select inputs either hard wired or actively driven to V CC or VSS. These inputs allow the selection of one of eight possible devices sharing acommonbus. Write Protection (WP) WP switched to V SS allows normal read/write operations. WP switched to V CC protects the EEPROM against changes (hardware write protection). Table 1 Pin No. Symbol Function 1, 2, 3 CS0, CS1, CS2 Chip select inputs 4 V SS Ground 5 SDA Serial bidirectional data bus 6 SCL Serial clock input 7 WP Write protection input 8 V CC Supply voltage |
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