Datasheet

January 1995 4
Philips Semiconductors Product specification
Dual 1-of-4 decoder/demultiplexer
HEF4555B
MSI
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
=25°C; C
L
= 50 pF; input transition times 20 ns
APPLICATION INFORMATION
Some examples of applications for the HEF4555B are:
Code conversion.
Address decoding.
Demultiplexing: when using the enable input as data input.
V
DD
V
SYMBOL MIN. TYP. MAX.
TYPICAL EXTRAPOLATION
FORMULA
Propagation delays
A
n
O
n
5 115 230 ns 88 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
45 90 ns 34 ns + (0,23 ns/pF) C
L
15 30 65 ns 22 ns + (0,16 ns/pF) C
L
5 140 280 ns 113 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
55 105 ns 44 ns + (0,23 ns/pF) C
L
15 40 75 ns 32 ns + (0,16 ns/pF) C
L
E
n
O
n
5 125 250 ns 98 ns + (0,55 ns/pF) C
L
HIGH to LOW 10 t
PHL
50 95 ns 39 ns + (0,23 ns/pF) C
L
15 30 65 ns 22 ns + (0,16 ns/pF) C
L
5 150 295 ns 123 ns + (0,55 ns/pF) C
L
LOW to HIGH 10 t
PLH
55 110 ns 44 ns + (0,23 ns/pF) C
L
15 40 75 ns 32 ns + (0,16 ns/pF) C
L
Output transition times 5 60 120 ns 10 ns + ((1,0 ns/pF) C
L
HIGH to LOW 10 t
THL
30 60 ns 9 ns + (0,42 ns/pF) C
L
15 20 40 ns 6 ns + (0,28 ns/pF) C
L
5 60 120 ns 10 ns + (1,0 ns/pF) C
L
LOW to HIGH 10 t
TLH
30 60 ns 9 ns + (0,42 ns/pF) C
L
15 20 40 ns 6 ns + (0,28 ns/pF) C
L
V
DD
V
TYPICAL FORMULA FOR P (µW)
Dynamic power 5 4500 f
i
+∑(f
o
C
L
) × V
DD
2
where
dissipation per 10 18 800 f
i
+∑(f
o
C
L
) × V
DD
2
f
i
= input freq. (MHz)
package (P) 15 45 700 f
i
+∑(f
o
C
L
) × V
DD
2
f
o
= output freq. (MHz)
C
L
= load capacitance (pF)
(f
o
C
L
) = sum of outputs
V
DD
= supply voltage (V)