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SN74F168 Datasheet(PDF) 7 Page - Texas Instruments |
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SN74F168 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 9 page SN74F168 SYNCHRONOUS 4-BIT UP/DOWN DECADE COUNTER SDFS057A – D2932, MARCH 1987 – REVISED OCTOBER 1993 2–7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 timing requirements over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) VCC = 5 V, TA = 25°C MIN MAX UNIT MIN MAX fclock Clock frequency 0 100 0 90 MHz tw Pulse duration CLK high or low 5 5.5 ns Data before CLK ↑ High or low 4 4.5 LOAD before CLK ↑ High or low 8 9 tsu Setup time ENP and ENT before CLK ↑ High or low 5 6 ns U/D before CLK ↑ High 11 12.5 U/D before CLK ↑ Low 16.5 18 Data after CLK ↑ High or low 3 3.5 th Hold time LOAD after CLK ↑ High or low 0 0 ns th Hold time ENP and ENT after CLK ↑ High or low 0 0 ns U/D after CLK ↑ High or low 0 0 switching characteristics (see Note 3) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 5 V, CL = 50 pF, RL = 500 Ω, TA = 25°C VCC = 4.5 V to 5.5 V, CL = 50 pF, RL= 500 Ω, TA = MIN to MAX† UNIT MIN TYP MAX MIN MAX fmax 100 115 90 MHz tPLH CLK Q 2.2 6.1 8.5 2.2 9.5 ns tPHL CLK Q 3.2 8.6 11.5 3.2 13 ns tPLH CLK RCO 4.7 11.6 15.5 4.7 17 ns tPHL CLK RCO 3.2 8.1 11 3.2 12.5 ns tPLH ENT RCO 1.7 4.1 6 1.7 7 ns tPHL ENT RCO 1.7 5.6 8 1.7 9 ns tPLH U/D RCO 2.7 8.1 11 2.7 12.5 ns tPHL U/D RCO 3.2 12.1 16 3.2 17.5 ns † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 3: Load circuits and waveforms are shown in Section 1. |
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