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FM22LD16 データシート(PDF) 2 Page - Ramtron International Corporation |
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FM22LD16 データシート(HTML) 2 Page - Ramtron International Corporation |
2 / 14 page FM22LD16 - 256Kx16 FRAM Rev. 2.0 Dec. 2009 Page 2 of 14 Figure 1. Block Diagram Pin Description Pin Name Type Pin Description A(17:0) Input Address inputs: The 18 address lines select one of 262,144 words in the F-RAM array. The lowest two address lines A(1:0) may be used for page mode read and write operations. /CE Input Chip Enable input: The device is selected and a new memory access begins when /CE is low. The entire address is latched internally on the falling edge of /CE. Subsequent changes to the A(1:0) address inputs allow page mode operation when /CE is low. /WE Input Write Enable: A write cycle begins when /WE is asserted. The rising edge causes the FM22LD16 to write the data on the DQ bus to the F-RAM array. The falling edge of /WE latches a new column address for page mode write cycles. /OE Input Output Enable: When /OE is low, the FM22LD16 drives the data bus when valid read data is available. Deasserting /OE high tri-states the DQ pins. DQ(15:0) I/O Data: 16-bit bi-directional data bus for accessing the F-RAM array. /UB Input Upper Byte Select: Enables DQ(15:8) pins during reads and writes. Deasserting /UB high tri-states the DQ pins. If the user does not perform byte writes and the device is not configured as a 512Kx8, the /UB and /LB pins may be tied to ground. /LB Input Lower Byte Select: Enables DQ(7:0) pins during reads and writes. Deasserting /LB high tri- states the DQ pins. If the user does not perform byte writes and the device is not configured as a 512Kx8, the /UB and /LB pins may be tied to ground. VDD Supply Supply Voltage VSS Supply Ground |
同様の部品番号 - FM22LD16 |
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同様の説明 - FM22LD16 |
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