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DS2251T-128-16 Datasheet(PDF) 10 Page - Dallas Semiconductor |
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DS2251T-128-16 Datasheet(HTML) 10 Page - Dallas Semiconductor |
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10 / 20 page  DS2251T 10 of 20 PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Pin Capacitance CIN 10 pF 5 Reset Trip Point in Stop Mode w/BAT=3.0V w/BAT=3.3V 4.0 4.4 4.25 4.65 V1 AC CHARACTERISTICS: EXPANDED BUS MODE TIMING SPECIFICATIONS (tA=0˚C to70˚C; VCC=5V ± 10%) # PARAMETER SYMBOL MIN MAX UNITS 1 Oscillator Frequency 1/tCLK 1.0 16 (-16) MHz 2 ALE Pulse Width tALPW 2tCLK -40 ns 3 Address Valid to ALE Low tAVALL tCLK -40 ns 4 Address Hold After ALE Low tAVAAV tCLK -35 ns 5 ALE Low to Valid Instr. In @ 12 MHz @ 16 MHz tALLVI 4tCLK -150 4tCLK -90 ns 6 ALE Low to PSEN Low tALLPSL tCLK -25 ns 7 PSEN Pulse Width tPSPW 3tCLK -35 ns 8 PSEN Low to Valid Instr. In @ 12 MHz @ 16 MHz tPSLVI 3tCLK -150 3tCLK -90 ns ns 9 Input Instr. Hold after PSEN Going High tPSIV 0ns 10 Input Instr. Float after PSEN Going High tPSIX tCLK -20 ns 11 Address Hold after PSEN Going High tPSAV tCLK -8 ns 12 Address Valid to Valid Instr. In @ 12 MHz @ 16 MHz tAVVI 5tCLK -150 5tCLK -90 ns ns 13 PSEN Low to Address Float tPSLAZ 0ns 14 RD Pulse Width tRDPW 6tCLK -100 ns 15 WR Pulse Width tWRPW 6tCLK -100 ns 16 RD Low to Valid Data In @ 12 MHz @ 16 MHz tRDLDV 5tCLK -165 5tCLK -105 ns ns 17 Data Hold after RD High tRDHDV 0ns 18 Data Float after RD High tRDHDZ 2tCLK -70 ns 19 ALE Low to Valid Data In @ 12 MHz @ 16 MHz tALLVD 8CLK -150 8tCLK -90 ns ns 20 Valid Addr. to Valid Data In @ 12 MHz @ 16 MHz tAVDV 9tCLK -165 9tCLK -105 ns ns 21 ALE Low to RD or WR Low tALLRDL 3tCLK -50 3tCLK +50 ns 22 Address Valid to RD or WR Low tAVRDL 4tCLK -130 ns 23 Data Valid to WR Going Low tDVWRL tCLK -60 ns 24 Data Valid to WR High @ 12 MHz tDVWRH 7tCLK -150 ns |
Similar Part No. - DS2251T-128-16 |
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Similar Description - DS2251T-128-16 |
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