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SN74LS490 Datasheet(PDF) 6 Page - Texas Instruments |
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SN74LS490 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 8 page SN54LS490, SN74LS490 DUAL 4-BIT DECADE COUNTERS SDLS125A – OCTOBER 1976 – REVISED JULY 1998 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS† SN74LS490 SN74LS490 UNIT PARAMETER TEST CONDITIONS† MIN TYP‡ MAX MIN TYP‡ MAX UNIT VIH High-level input voltage 2 2 V VIL Low-level input voltage 0.7 0.8 V VIK Input clamp voltage VCC = MIN, II = –18 mA –1.5 –1.5 V VOH High-level output voltage VCC = MIN, VIH = 2 V, VIL = VILmax 2.5 3.4 2.7 3.4 V VOL Low level output voltage VCC = MIN, VIH 2V IOL = 4 mA 0.25 0.4 0.25 0.4 V VOL Low-level output voltage VIH = 2 V, VIL = VILmax IOL = 8 mA 0.35 0.5 V II Input current at maximum CLR, SET9 VCC = MAX, VI = 7 V 0.1 0.1 mA II at maximum input voltage CLK VCC = MAX, VI = 5.5 V 0.2 0.2 mA IIH High-level CLR, SET9 VCC = MAX VI =2 7V 20 20 µA IIH g input current CLK VCC = MAX, VI = 2.7 V 100 100 µA IIL Low-level CLR, SET9 VCC = MAX VI =0 4V –0.4 –0.4 mA IIL input current CLK VCC = MAX, VI = 0.4 V –1.6 –1.6 mA IOS§ Short-circuit output current VCC = MAX –20 –100 –20 –100 mA ICC Supply current VCC = MAX, See Note 3 15 26 15 26 mA † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. ‡ All typical values are at VCC = 5 V, TA = 25°C. § Not more than one output should be shorted at a time, and duration of the short circuit should not exceed one second. NOTE 3: ICC is measured with all outputs open, both CLR inputs grounded following momentary connection to 4.5 V, and all other inputs grounded. switching characteristics, VCC = 5 V, TA = 25°C (see Figures 1 and 2) PARAMETER FROM TO TEST CONDITIONS MIN TYP MAX UNIT PARAMETER (INPUT) (OUTPUT) TEST CONDITIONS MIN TYP MAX UNIT fmax CLK QA CL = 15 pF, RL = 2 kΩ 25 35 MHz tPLH CLK QA CL =15 pF RL =2kΩ 12 20 ns tPHL CLK QA CL = 15 pF, RL = 2 kΩ 13 20 ns tPLH CLK QB QD CL =15 pF RL =2kΩ 24 39 ns tPHL CLK QB, QD CL = 15 pF, RL = 2 kΩ 26 39 ns tPLH CLK QC CL =15 pF RL =2kΩ 32 54 ns tPHL CLK QC CL = 15 pF, RL = 2 kΩ 36 54 ns tPHL CLR Any CL = 15 pF, RL = 2 kΩ 24 39 ns tPLH SET9 QA, QD CL =15 pF RL =2kΩ 24 39 ns tPHL SET9 QB, QC CL = 15 pF, RL = 2 kΩ 20 36 ns |
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