74LCX139_06 Datasheet, PDF (8/17 Pages) STMicroelectronics – Low voltage CMOS Dual 2 to 4 decoder / demultiplexer

Electrical characteristics
74LCX139
Table 7. AC electrical characteristics
Test condition
Value
Symbol
Parameter
V_CC
C_L
R_L
t_s = t_r ^{-40 to 85 °C Unit}
(V)
(pF)
(Ω)
(ns)
Min Max
t_PLH t_PHL Propagation
2.7
50
500
2.5
7.3 ns
Delay Time A, B
to Y
3.0 to 3.6
1.0 6.2
t_PLH t_PHL Propagation
2.7
50
500
2.5
5.8 ns
Delay Time G to Y _{3.0 to 3.6}
1.0 5.3
t_OSLH Output To Output 3.0 to 3.6
50
500
2.5
t_OSHL Skew Time ^{(1) (2)}
1.0 ns
1. Skew is defined as the absolute value of the difference between the actual propagation delay for any two
outputs of the same device switching in the same direction, either HIGH or LOW (t_OSLH = | t_PLHm - t_PLHn|,
t_OSHL = | t_PHLm - t_PHLn|)
2. Parameter guaranteed by design
Table 8. Capacitive characteristics
Test condition
Symbol
Parameter
V_CC
(V)
C_IN Input capacitance
Power dissipation
C_{PD capacitance (1)}
3.3
V_IN = 0 to V_CC
3.3
f_IN = 10MHz
V_IN = 0 or V_CC
Value
T_A = 25 °C
Unit
Min Typ Max
6
pF
26
pF
1. C_PD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the
operating current consumption without load. (Refer to Test Circuit). Average operating current can be
obtained by the following equation. I_CC(opr) = C_PD x V_CC x f_IN + I_CC
8/17