MC74HC158 查看數據表（PDF） - Motorola => Freescale
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MC74HC158 Datasheet PDF : 6 Pages
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MC54/74HC158
AC CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
VCC
Guaranteed Limit
V –55 to 25°C ≤85°C
≤125°C Unit
tPLH,
tPHL
Maximum Propagation Delay, Input A or B to Output Y
(Figures 3 and 5)
2.0
125
4.5
25
6.0
21
155
190
ns
31
38
26
32
tPLH,
tPHL
Maximum Propagation Delay, Select to Output Y
(Figures 3 and 5)
2.0
125
4.5
25
6.0
21
155
190
ns
31
38
26
32
tPLH,
tPHL
Maximum Propagation Delay, Output Enable to Output Y
(Figures 4 and 5)
2.0
115
4.5
23
6.0
20
145
175
ns
29
35
25
30
tTLH,
tTHL
Maximum Output Transition Time, Any Output
(Figures 2 and 5)
2.0
75
4.5
15
6.0
13
95
110
ns
19
22
16
19
Cin
Maximum Input Capacitance
10
10
10
pF
NOTE: For propagation delays with loads other than 50 pF, and information on typical parametric values, see Chapter 2 of the Motorola High–
Speed CMOS Data Book (DL129/D).
Typical @ 25°C, VCC = 5.0 V
CPD Power Dissipation Capacitance (Per Package)*
35
pF
* Used to determine the no–load dynamic power consumption: PD = CPD VCC2f + ICC VCC. For load considerations, see Chapter 2 of the
Motorola High–Speed CMOS Data Book (DL129/D).
SWITCHING WAVEFORMS
tr
Input Aor B
tPHL
Output Y
90%
50%
10%
90%
50%
10%
tTHL
Figure 1.
tf
VCC
GND
tPLH
tTLH
tr
Select
tPHL
Output Y
90%
50%
10%
90%
50%
10%
tTHL
tf
VCC
GND
tPLH
tTLH
Figure 2. Y versus Select, Inverted
tr
Output Enable
tPLH
Output Y
90%
50%
10%
90%
50%
10%
tTLH
Figure 3.
tf
VCC
GND
tPHL
tTHL
DEVICE
UNDER
TEST
TEST
POINT
OUTPUT
CL*
*Includes all probe and jig capacitance
Figure 4. Test Circuit
High–Speed CMOS Logic Data
3
DL129 — Rev 6
MOTOROLA
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