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HC49 Datasheet(PDF) 4 Page - Hitachi Semiconductor |
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HC49 Datasheet(HTML) 4 Page - Hitachi Semiconductor |
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4 / 8 page  HD74HC490 4 AC Characteristics (C L = 50 pF, Input tr = tf = 6 ns) Ta = 25 °C Ta = –40 to +85 °C Item Symbol V CC (V) Min Typ Max Min Max Unit Test Conditions Maximum clock f max 2.0 — — 4 — 3 MHz frequency 4.5 — — 20 — 16 6.0 — — 24 — 19 Propagation delay t PLH 2.0 — — 120 — 150 ns Clock to Q A time t PHL 4.5 — 13 24 — 30 6.0 — — 20 — 26 t PLH 2.0 — — 205 — 255 ns Clock to Q B QC t PHL 4.5 — 21 41 — 51 6.0 — — 35 — 43 t PLH 2.0 — — 280 — 350 ns Clock to Q C t PHL 4.5 — 23 56 — 70 6.0 — — 48 — 60 t PHL 2.0 — — 205 — 255 ns Clear to any output 4.5 — 18 41 — 51 6.0 — — 35 — 43 t PLH 2.0 — — 205 — 255 ns Set-to-9 to Q A, QD 4.5 — 13 41 — 51 6.0 — — 35 — 43 t PHL 2.0 — — 190 — 240 ns Set-to-9 to Q B, QC 4.5 — 17 38 — 48 6.0 — — 32 — 41 Pulse width t w 2.0 80 — — 100 — ns 4.5 16 6 — 20 — 6.0 14 — — 17 — Setup time t su 2.0 100 — — 125 — ns 4.5 20 1 — 25 — 6.0 17 — — 21 — Output rise/fall t TLH 2.0 — — 75 — 95 ns time t THL 4.5 — 5 15 — 19 6.0 — — 13 — 16 Input capacitance Cin — — 5 10 — 10 pF |
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