HD74HC148 Datasheet, PDF (4/8 Pages) Hitachi Semiconductor – 8-to-3-line Octal Priority Encoder

HD74HC148
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
— — 230 —
— 15 46 —
— — 39 —
Max Unit
290 ns
58
49
t _PLH
2.0
— — 250 — 315 ns
t _PHL
4.5
— 16 50 — 63
6.0
— — 43 — 54
t _PLH
2.0
— — 270 — 340 ns
t _PHL
4.5
— 18 54 — 68
6.0
— — 46 — 58
t _PLH
2.0
— — 230 — 290 ns
t _PHL
4.5
— 12 46 — 58
6.0
— — 39 — 49
t _PLH
2.0
— — 250 — 315 ns
t _PHL
4.5
— 12 50 — 63
6.0
— — 43 — 54
t _PLH
2.0
— — 270 — 340 ns
t _PHL
4.5
— 12 54 — 68
6.0
— — 46 — 58
Output rise/fall
t _TLH
time
t _THL
2.0
— — 75 — 90 ns
4.5
— 5 15 — 19
6.0
— — 13 — 16
Input capacitance Cin
—
— 5 10 — 10 pF
Test Conditions
0 - 7 to A₀ - A₂
0 - 7 to EO
0 - 7 to GS
EI to A₀ - A₂
EI to GS
EI to EO
4