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IDT72021L35DB Datasheet(PDF) 2 Page - Integrated Device Technology |
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IDT72021L35DB Datasheet(HTML) 2 Page - Integrated Device Technology |
2 / 14 page 5.09 2 MILITARY AND COMMERCIAL TEMPERATURE RANGES IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT 1K x 9, 2K x 9, 4K x 9 PIN CONFIGURATIONS PIN DESCRIPTIONS Symbol Name I/O Description D0–D8 Inputs I Data inputs for 9-bit wide data. RS Reset I When RS is set LOW, internal READ and WRITE pointers are set to the first location of the RAM array. HF and FF go HIGH, and AEF and EF go LOW. A reset is required before an initial WRITE after power-up. R and W must be HIGH during RS cycle. W Write I When WRITE is LOW, data can be written into the RAM array sequentially, independent of READ. In order for WRITE to be active, FF must be HIGH. When the FIFO is full (FF-LOW), the internal WRITE operation is blocked. R Read I When READ is LOW, data can be read from the RAM array sequentially, independent of WRITE. In order for READ to be active, EF must be HIGH. When the FIFO is empty (EF-LOW), the internal READ operation is blocked. The three-state output buffer is controlled by the read signal and the external output control (OE). FL/RT First Load/ I This is a dual-purpose input. In the single device configuration ( XI grounded), activating retransmit ( FL/RT-LOW) will set the internal READ pointer to the first location. There is no effect on the WRITE pointer. R and W must be HIGH before setting FL/RT LOW. Retransmit is not compatible with depth expansion. In the depth expansion configuration, FL/RT-LOW indicates the first activated device. XI Expansion In I In the single device configuration, XI is grounded. In depth expansion or daisy chain expansion, XI is connected to XO (expansion out) of the previous device. OE Output Enable I When OE is set HIGH, the data flow through the three-state output buffer is inhibited regardless of an active READ operation. A read operation does increment the read pointer in this situation. When OE is set LOW, Q0-Q8 are still in a HIGH impedance condition if no READ occurs. For a complete READ operation with data appearing on Q0-Q8, both R and OE should be asserted LOW. FF Full Flag O When FF goes LOW, the device is full and further WRITE operations are inhibited. When FF is HIGH, the device is not full. EF Empty Flag O When EF goes LOW, the device is empty and further READ operations are inhibited. When EF is HIGH, the device is not empty. AEF Almost-Empty/ O When AEF is LOW, the device is empty to 1/8 full or 7/8 to completely full. When AEF is HIGH, the device is greater than 1/8 full, but less than 7/8 full. XO/HF Expansion Out/ O This is a dual purpose output. In the single device configuration ( XI grounded), the device is more than half full when HF is LOW. In the depth expansion configuration (XO connected to XI of the next device), a pulse is sent from XO to XI when the last location in the RAM array is filled. Q0–Q8 Outputs O Data outputs for 9-bit wide data. Retransmit Almost-Full Flag Half-Full Flag 2677 tbl 01 PLCC TOP VIEW DIP TOP VIEW D2 5 D1 6 D0 7 XI 8 AEF 9 FF 10 Q0 11 Q1 12 Q2 13 D6 D7 FL/RT RS OE EF XO/HF Q7 Q6 29 28 27 26 25 24 23 22 21 4 3 2 1 32 31 30 14 15 16 17 18 19 20 INDEX J32-1 2677 drw 03 VCC D4 D5 D6 D7 FL/RT RS OE XO/HF EF Q7 Q6 Q5 Q4 R GND VCC W D8 D3 D2 D1 D0 XI AEF FF Q0 Q1 Q2 Q3 Q8 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 D32-1 2677 drw 02 |
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