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HD74HC78 Datasheet(PDF) 4 Page - Renesas Technology Corp |
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HD74HC78 Datasheet(HTML) 4 Page - Renesas Technology Corp |
4 / 7 page HD74HC78 Rev.2.00, Oct 06, 2005 page 4 of 6 Switching Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = 25 °C Ta = –40 to +85 °C Item Symbol VCC (V) Min Typ Max Min Max Unit Test Conditions 2.0 — — 6 — 5 4.5 — — 30 — 24 Maximum clock frequency fmax 6.0 — — 35 — 28 MHz 2.0 — — 150 — 190 4.5 — 20 30 — 38 6.0 — — 26 — 33 ns Clock to Q or Q 2.0 — — 140 — 175 4.5 — 18 28 — 35 6.0 — — 24 — 30 ns Clear to Q or Q 2.0 — — 140 — 175 4.5 — 18 28 — 35 Propagation delay time tPLH, tPHL 6.0 — — 24 — 30 ns Preset to Q or Q 2.0 80 — — 100 — 4.5 16 8 — 20 — Pulse width tw 6.0 14 — — 17 — ns Preset, Clear, Clock 2.0 100 — — 125 — 4.5 20 2 — 25 — Setup time tsu 6.0 17 — — 21 — ns J or K to Clock 2.0 5 — — 5 — 4.5 5 –1 — 5 — Hold time th 6.0 5 — — 5 — ns Clock to J or K 2.0 100 — — 125 — 4.5 20 0 — 25 — Removal time trem 6.0 17 — — 21 — ns Preset or Clear to Clock 2.0 — — 75 — 95 4.5 — 5 15 — 19 Output rise/fall time tTLH, tTHL 6.0 — — 13 — 16 ns Input capacitance Cin — — 5 10 — 10 pF Test Circuit VCC Clock VCC Zout = 50 Ω Input Clear Zout = 50 Ω Input CL = 50 pF Output CL = 50 pF Output Q Q J K Note: C includes the probe and jig capacitance. L Pulse generator Pulse generator Preset |
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