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AT45DB642D-TU Datasheet(PDF) 4 Page - ATMEL Corporation |
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AT45DB642D-TU Datasheet(HTML) 4 Page - ATMEL Corporation |
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4 / 55 page  4 3542F–DFLASH–09/06 AT45DB642D SER/BYTE Serial/8-bit Interface Control: The DataFlash may be configured to utilize either its serial port or 8-bit port through the use of the serial/8-bit control pin (SER/BYTE). When the SER/BYTE pin is held high, the serial port (SI and SO) of the DataFlash will be used for all data transfers, and the 8-bit port (I/O7 - I/O0) will be in a high impedance state. Any data presented on the 8-bit port while SER/BYTE is held high will be ignored. When the SER/BYTE is held low, the 8-bit port will be used for all data transfers, and the SO pin of the serial port will be in a high impedance state. While SER/BYTE is low, any data presented on the SI pin will be ignored. Switching between the serial port and 8-bit port should only be done while the CS pin is high and the device is not busy in an internally self-timed operation. The SER/BYTE pin is internally pulled high; therefore, if the 8-bit port is never to be used, then connection of the SER/BYTE pin is not necessary. In addition, if the SER/BYTE pin is not connected or if the SER/BYTE pin is always driven high externally, then the 8-bit input/output pins (I/O7-I/O0), the VCCP pin, and the GNDP pin should be treated as “no connect”. Low Input V CC Device Power Supply: The VCC pin is used to supply the source voltage to the device. Operations at invalid VCC voltages may produce spurious results and should not be attempted. –Power GND Ground: The ground reference for the power supply. GND should be connected to the system ground. – Ground V CCP 8-bit Port Supply Voltage: The VCCP pin is used to supply power for the 8-bit input/output pins (I/O7-I/O0). The VCCP pin needs to be used if the 8-bit port is to be utilized; however, this pin should be treated as “no connect” if the SER/BYTE pin is not connected or if the SER/BYTE pin is always driven high externally. –Power GNDP 8-bit Port Ground: The GNDP pin is used to provide ground for the 8-bit input/output pins (I/O7- I/O0). The GNDP pin needs to be used if the 8-bit port is to be utilized; however, this pin should be treated as “no connect” if the SER/BYTE pin is not connected or if the SER/BYTE pin is always driven high externally. – Ground Table 2-1. Pin Configurations (Continued) Symbol Name and Function Asserted State Type Figure 2-1. TSOP Top View: Type 1 Figure 2-2. DataFlash Card (1) Note: 1. See AT45DCB008D Datasheet. Figure 2-3. CASON Top View through Package 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 RDY/BUSY RESET WP NC NC VCC GND NC NC NC CS SCK/CLK SI SO NC NC I/O7 I/O6 I/O5 I/O4 VCCP GNDP I/O3 I/O2 I/O1 I/O0 SER/BYTE NC 76 54321 SI SCK RESET CS SO GND VCC WP 8 7 6 5 1 2 3 4 |
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