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FM21L16 Datasheet(PDF) 3 Page - Cypress Semiconductor |
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FM21L16 Datasheet(HTML) 3 Page - Cypress Semiconductor |
3 / 22 page FM21L16 Document Number: 001-86191 Rev. *D Page 3 of 22 Pinout Figure 1. 44-pin TSOP II pinout Pin Definitions Pin Name I/O Type Description A16–A0 Input Address inputs : The 17 address lines select one of 128K words in the F-RAM array. The lowest two address lines A1–A0 may be used for page mode read and write operations. DQ15–DQ0 Input/Output Data I/O Lines: 16-bit bidirectional data bus for accessing the F-RAM array. WE Input Write Enable : A write cycle begins when WE is asserted. The rising edge causes the FM21L16 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. CE Input Chip Enable : The device is selected and a new memory access begins on the falling edge of CE. The entire address is latched internally at this point. Subsequent changes to the A1–A0 address inputs allow page mode operation. OE Input Output Enable : When OE is LOW, the FM21L16 drives the data bus when the valid read data is available. Deasserting OE HIGH tristates the DQ pins. UB Input Upper Byte Select : Enables DQ15–DQ8 pins during reads and writes. These pins are HI-Z if UB is HIGH. If the user does not perform byte writes and the device is not configured as a 256 K × 8, the UB and LB pins may be tied to ground. LB Input Lower Byte Select : Enables DQ7–DQ0 pins during reads and writes. These pins are HI-Z if LB is HIGH. If the user does not perform byte writes and the device is not configured as a 256 K × 8, the UB and LB pins may be tied to ground. ZZ Input Sleep : When ZZ is LOW, the device enters a low-power sleep mode for the lowest supply current condition. ZZ must be HIGH for a normal read/write operation. If unused, tie ZZ pin to VDD. VSS Ground Ground for the device. Must be connected to the ground of the system. VDD Power supply Power supply input to the device. NC No connect No connect. This pin is not connected to the die. VSS DQ6 DQ5 DQ4 VDD A9 DQ3 A10 DQ2 DQ1 DQ0 LB A12 CE A3 A2 A1 A0 A16 A15 A14 A13 A11 NC A8 UB OE A7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 44-pin TSOP II Top View (not to scale) WE DQ7 A4 VSS VDD DQ15 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8 (× 16) ZZ A6 A5 |
Similar Part No. - FM21L16 |
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Similar Description - FM21L16 |
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