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IDT70V25 Datasheet(PDF) 13 Page - Integrated Device Technology |
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IDT70V25 Datasheet(HTML) 13 Page - Integrated Device Technology |
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13 / 22 page  6.42 IDT70V25S/L High-Speed 8K x 16 Dual-Port Static RAM Industrial and Commercial Temperature Ranges 13 AC Electrical Characteristics Over the Operating Temperature and Supply Voltage Range(6) NOTES: 1. Port-to-port delay through SRAM cells from writing port to reading port, refer to "TIMING WAVEFORM OF WRITE PORT-TO-PORT READ AND BUSY (M/S = VIH)". 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 the write cycle is inhibited during contention. 5. To ensure that a write cycle is completed after contention. 6. 'X' in part number indicates power rating (S or L). 70V25X15 Com'l Ony 70V25X20 Com'l & Ind 70V25X25 Com'l & Ind Symbol Parameter Min. Max. Min. Max. Min. Max. Unit BUSY TIMING (M/S = VIH) tBAA BUSY Access Time from Address Match ____ 15 ____ 20 ____ 20 ns tBDA BUSY Disable Time from Address Not Matched ____ 15 ____ 20 ____ 20 ns tBAC BUSY Access Time from Chip Enable LOW ____ 15 ____ 20 ____ 20 ns tBDC BUSY Disable Time from Chip Enable HIGH ____ 15 ____ 17 ____ 17 ns tAPS Arbitration Priority Set-up Time(2) 5 ____ 5 ____ 5 ____ ns tBDD BUSY Disable to Valid Data(3) ____ 18 ____ 30 ____ 30 ns tWH Write Hold After BUSY(5) 12 ____ 15 ____ 17 ____ ns BUSY TIMING (M/S = VIL) tWB BUSY Input to Write(4) 0 ____ 0 ____ 0 ____ ns tWH Write Hold After BUSY(5) 12 ____ 15 ____ 17 ____ ns PORT-TO-PORT DELAY TIMING tWDD Write Pulse to Data Delay(1) ____ 30 ____ 45 ____ 50 ns tDDD Write Data Valid to Read Data Delay(1) ____ 25 ____ 35 ____ 35 ns 2944 tbl 13a 70V25X35 Com'l & Ind 70V25X55 Com'l & Ind Symbol Parameter Min. Max. Min. Max. Unit BUSY TIMING (M/S = VIH) tBAA BUSY Access Time from Address Match ____ 20 ____ 45 ns tBDA BUSY Disable Time from Address Not Matched ____ 20 ____ 40 ns tBAC BUSY Access Time from Chip Enable LOW ____ 20 ____ 40 ns tBDC BUSY Disable Time from Chip Enable HIGH ____ 20 ____ 35 ns tAPS Arbitration Priority Set-up Time(2) 5 ____ 5 ____ ns tBDD BUSY Disable to Valid Data(3) ____ 35 ____ 40 ns tWH Write Hold After BUSY(5) 25 ____ 25 ____ ns BUSY TIMING (M/S = VIL) tWB BUSY Input to Write(4) 0 ____ 0 ____ ns tWH Write Hold After BUSY(5) 25 ____ 25 ____ ns PORT-TO-PORT DELAY TIMING tWDD Write Pulse to Data Delay(1) ____ 60 ____ 80 ns tDDD Write Data Valid to Read Data Delay(1) ____ 45 ____ 65 ns 2944 tbl 13b |
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