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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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NSC800 数据表(PDF) 4 Page - National Semiconductor (TI) |
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NSC800 数据表(HTML) 4 Page - National Semiconductor (TI) |
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4 / 76 page  40 AC Electrical Characteristics VCC e 5V g10% GND e 0V unless otherwise specified Symbol Parameter NSC800-1 NSC800-3 NSC800-35 NSC800-4 Units Notes Min Max Min Max Min Max Min Max tX Period at XIN and XOUT 500 3333 200 3333 142 3333 125 3333 ns Pins T Period at Clock Output 1000 6667 400 6667 284 6667 250 6667 ns (e2tX) tR Clock Rise Time 110 110 90 80 ns Measured from 10% – 90% of signal tF Clock Fall Time 70 60 55 50 ns Measured from 10% – 90% of signal tL Clock Low Time 435 150 90 80 ns 50% duty cycle square wave input on XIN tH Clock High Time 450 145 85 75 ns 50% duty cycle square wave input on XIN tACC(OP) ALE to Valid Data 1340 490 340 300 ns Add t for each WAIT STATE tACC(MR) ALE to Valid Data 1875 620 405 360 ns Add t for each WAIT STATE tAFR AD(0 – 7) Float after 0 0 0 0 ns RD Falling tBABE BACK Rising to Bus 1000 400 300 250 ns Enable tBABF BACK Falling to 50 50 50 50 ns Bus Float tBACL BACK Fall to CLK 425 125 60 55 ns Falling tBRH BREQ Hold Time 0 0 0 0 ns tBRS BREQ Set-Up Time 100 50 50 45 ns tCAF Clock Falling ALE 0 70 0 65 0 60 0 55 ns Falling tCAR Clock Rising to ALE 0 100 0 100 0 90 0 80 ns Rising tCRD Clock Rising to 100 90 90 80 ns Read Rising tCRF Clock Rising to 80 70 70 65 ns Refresh Falling tDAI ALE Falling to INTA 445 160 95 85 ns Falling tDAR ALE Falling to 400 575 160 250 100 180 90 160 ns RD Falling tDAW ALE Falling to 900 1010 350 420 225 300 200 265 ns WR Falling tD(BACK)1 ALE Falling to BACK 2460 975 635 560 ns Add t for each WAIT state Falling Add t for opcode fetch cycles tD(BACK)2 BREQ Rising to BACK 500 1610 200 700 140 540 125 475 ns Rising tD(I) ALE Falling to INTR 1360 475 284 250 ns Add t for each WAIT state NMI RSTA-C PS Add t for opcode fetch cycles BREQ Inputs Valid tDPA Rising PS to 500 1685 200 760 140 580 125 510 ns See Figure 14 also Falling ALE tD(WAIT) ALE Falling to 550 250 170 125 ns WAIT Input Valid OP Opcode Fetch MR Memory Read 4 |
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