HD74HC251 Datasheet, PDF (5/9 Pages) Hitachi Semiconductor – 1 of 8 Data Selectors/Multiplexers (with 3-state outputs)

HD74HC251
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
— — 205 —
— 20 41 —
— — 35 —
Max Unit
255 ns
51
43
t _PLH
2.0
— — 205 — 255 ns
t _PHL
4.5
— 20 41 — 51
6.0
— — 35 — 43
t _PLH
2.0
— — 195 — 245 ns
t _PHL
4.5
— 17 39 — 49
6.0
— — 33 — 42
t _PLH
2.0
— — 185 — 230 ns
t _PHL
4.5
— 17 37 — 46
6.0
— — 31 — 39
Output enable
t _ZH
time
t _ZL
2.0
— — 150 — 190 ns
4.5
— 11 30 — 38
6.0
— — 26 — 33
t _ZH
2.0
— — 145 — 180 ns
t _ZL
4.5
— 11 29 — 36
6.0
— — 25 — 31
Output disable
t _HZ
time
t _LZ
2.0
— — 220 — 275 ns
4.5
— 12 44 — 55
6.0
— — 37 — 47
t _HZ
2.0
— — 195 — 245 ns
t _LZ
4.5
— 12 39 — 49
6.0
— — 33 — 42
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
A, B or C to Y
A, B or C to W
Data to Y
Data to W
strobe to W R_L = 1 kΩ
strobe to Y R_L = 1 kΩ
strobe to W R_L = 1 kΩ
strobe to Y R_L = 1 kΩ
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