HEF4556BP 查看數據表（PDF） - Philips Electronics
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HEF4556BP Datasheet PDF : 4 Pages
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Philips Semiconductors
Dual 1-of-4 decoder/demultiplexer
Product specification
HEF4556B
MSI
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL MIN. TYP. MAX.
Propagation delays
An → On
HIGH to LOW
LOW to HIGH
En → 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
tPHL
15
5
10
tPLH
15
5
10
tTHL
15
5
10
tTLH
15
130 255 ns
50 100 ns
35 65 ns
105 210 ns
40 85 ns
30 60 ns
120 240 ns
45 90 ns
30 60 ns
105 205 ns
40 80 ns
30 60 ns
60 120 ns
30 60 ns
20 40 ns
60 120 ns
30 60 ns
20 40 ns
TYPICAL EXTRAPOLATION
FORMULA
103 ns + (0,55 ns/pF) CL
39 ns + (0,23 ns/pF) CL
27 ns + (0,16 ns/pF) CL
78 ns + (0,55 ns/pF) CL
29 ns + (0,23 ns/pF) CL
22 ns + (0,16 ns/pF) CL
93 ns + (0,55 ns/pF) CL
34 ns + (0,23 ns/pF) CL
22 ns + (0,16 ns/pF) CL
78 ns + (0,55 ns/pF) CL
29 ns + (0,23 ns/pF) CL
22 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
4400 fi + ∑ (foCL) × VDD2
where
10
18 000 fi + ∑ (foCL) × VDD2
fi = input freq. (MHz)
15
43 300 fi + ∑ (foCL) × VDD2
fo = output freq. (MHz)
CL = load capacitance (pF)
∑ (foCL) = sum of outputs
VDD = supply voltage (V)
APPLICATION INFORMATION
Some examples of applications for the HEF4556B are:
• Code conversion.
• Address decoding.
• Demultiplexing: when using the enable input as data input.
January 1995
4
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