HD74HC640 Datasheet, PDF (7/11 Pages) Hitachi Semiconductor – Octal Bus Transceivers (with 3-state outputs)

HD74HC640/HD74HC643
AC Characteristics (C_L = 50 pF, Input t_r = t_f = 6 ns)
Ta = 25°C
Ta = –40 to
+85°C
Item
Symbol
Propagation delay t_PLH
time
t _PHL
V_CC (V)
2.0
4.5
6.0
Min Typ Max Min
— — 90 —
— 12 18 —
— — 15 —
Max Unit
115 ns
23
20
Output enable
t _ZH
time
t _ZL
2.0
— — 230 — 290 ns
4.5
— 15 46 — 58
6.0
— — 39 — 49
Output disable
t _HZ
time
t _LZ
2.0
— — 215 — 270 ns
4.5
— 17 43 — 54
6.0
— — 37 — 46
Output rise/fall
t _TLH
time
t _THL
2.0
— — 60 — 75 ns
4.5
— 4 12 — 15
6.0
— — 10 — 13
Input capacitance Cin
—
— 5 10 — 10 pF
Test Conditions
7