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71421SA35JGI Datasheet(PDF) 11 Page - Integrated Device Technology |
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71421SA35JGI Datasheet(HTML) 11 Page - Integrated Device Technology |
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11 / 17 page  6.42 IDT71321SA/LA and IDT71421SA/LA High Speed 2K x 8 Dual-Port Static RAM with Interrupts Industrial and Commercial Temperature Ranges 11 AC Electrical Characteristics Over the Operating Temperature and Supply Voltage Range(6) NOTES: 1. Port-to-port delay through RAM cells from the writing port to the reading port, refer to “Timing Waveform of Write with Port-to-Port Read and BUSY." 2. To ensure that the earlier of the two ports wins. 3. tBDD is a calculated parameter and is the greater of 0, tWDD – tWP (actual) or tDDD – tDW (actual). 4. To ensure that a write cycle is inhibited on port "B" during contention on port "A". 5. To ensure that a write cycle is completed on port "B" after contention on port "A". 6. 'X' in part numbers indicates power rating (SA or LA).. 71321X20 71421X20 Com'l Only 71321X25 71421X25 Com'l & Ind Symbol Parameter Min.Max.Min.Max. Unit BUSY TIMING (For MASTER 71321) tBAA BUSY Access Time from Address ____ 20 ____ 20 ns tBDA BUSY Disable Time from Address ____ 20 ____ 20 ns tBAC BUSY Access Time from Chip Enable ____ 20 ____ 20 ns tBDC BUSY Disable Time from Chip Enable ____ 20 ____ 20 ns tWH Write Hold After BUSY(5) 12 ____ 15 ____ ns tWDD Write Pulse to Data Delay(1) ____ 50 ____ 50 ns tDDD Write Data Valid to Read Data Delay (1) ____ 35 ____ 35 ns tAPS Arbitration Priority Set-up Time (2) 5 ____ 5 ____ ns tBDD BUSY Disable to Valid Data(3) ____ 25 ____ 35 ns BUSY INPUT TIMING (For SLAVE 71421) tWB Write to BUSY Input(4) 0 ____ 0 ____ ns tWH Write Hold After BUSY(5) 12 ____ 15 ____ ns tWDD Write Pulse to Data Delay(1) ____ 40 ____ 50 ns tDDD Write Data Valid to Read Data Delay (1) ____ 30 ____ 35 ns 2691 tbl 10a 71321X35 71421X35 Com'l Only 71321X55 71421X55 Com'l & Ind Symbol Parameter Min.Max.Min.Max. Unit BUSY TIMING (For MASTER 71321) tBAA BUSY Access Time from Address ____ 20 ____ 30 ns tBDA BUSY Disable Time from Address ____ 20 ____ 30 ns tBAC BUSY Access Time from Chip Enable ____ 20 ____ 30 ns tBDC BUSY Disable Time from Chip Enable ____ 20 ____ 30 ns tWH Write Hold After BUSY(5) 20 ____ 20 ____ ns tWDD Write Pulse to Data Delay(1) ____ 60 ____ 80 ns tDDD Write Data Valid to Read Data Delay(1) ____ 35 ____ 55 ns tAPS Arbitration Priority Set-up Time(2) 5 ____ 5 ____ ns tBDD BUSY Disable to Valid Data(3) ____ 35 ____ 50 ns BUSY INPUT TIMING (For SLAVE 71421) tWB Write to BUSY Input(4) 0 ____ 0 ____ ns tWH Write Hold After BUSY(5) 20 ____ 20 ____ ns tWDD Write Pulse to Data Delay(1) ____ 60 ____ 80 ns tDDD Write Data Valid to Read Data Delay(1) ____ 35 ____ 55 ns 2691 tbl 10b |
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