HD74HC149 Datasheet, PDF (5/9 Pages) Hitachi Semiconductor – 8-to-8-line Priority Encoder

HD74HC149
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
— — 140 —
— 16 28 —
— — 24 —
Max Unit
175 ns
35
30
t _PLH
2.0
— — 155 — 195 ns
t _PHL
4.5
— 13 31 — 39
6.0
— — 26 — 33
Output rise/fall
t _TLH
time
t _THL
2.0
— — 75 — 95 ns
4.5
— 5 15 — 19
6.0
— — 13 — 16
Input capacitance Cin
—
— 5 10 — 10 pF
Test Conditions
0 - 7 to Y, P
E to Y, P
5