HEF4078 查看數據表（PDF） - Philips Electronics
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HEF4078 Datasheet PDF : 3 Pages
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Philips Semiconductors
8-input NOR gate
Product specification
HEF4078B
gates
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL TYP. MAX.
Propagation delays
In → On
HIGH to LOW
LOW to HIGH
Output transition
times
HIGH to LOW
LOW to HIGH
5
10
tPHL
15
5
10
tPLH
15
5
10
tTHL
15
5
10
tTLH
15
80
160 ns
35
70 ns
25
50 ns
80
160 ns
35
70 ns
25
50 ns
60
120 ns
30
60 ns
20
40 ns
60
120 ns
30
60 ns
20
40 ns
TYPICAL EXTRAPOLATION
FORMULA
53 ns + (0,55 ns/pF) CL
24 ns + (0,23 ns/pF) CL
17 ns + (0,16 ns/pF) CL
53 ns + (0,55 ns/pF) CL
24 ns + (0,23 ns/pF) CL
17 ns + (0,16 ns/pF) CL
10 ns + (1,0 ns/pF) CL
9 ns + (0,42 ns/pF) CL
6 ns + (0,28 ns/pF) CL
10 ns + (1,0 ns/pF) CL
9 ns + (0,42 ns/pF) CL
6 ns + (0,28 ns/pF) CL
Dynamic power
dissipation per
package (P)
VDD
V
TYPICAL FORMULA FOR P (µW)
5
750 fi + ∑ (foCL) × VDD 2
where
10
2800 fi + ∑ (foCL) × VDD 2
fi = input freq. (MHz)
15
7500 fi + ∑ (foCL) × VDD 2
fo = output freq. (MHz)
CL = load capacitance (pF)
∑ (foCL) = sum of outputs
VDD = supply voltage (V)
January 1995
3
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