MC74HC242 查看數據表（PDF） - Motorola => Freescale
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MC74HC242 Datasheet PDF : 5 Pages
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MC74HC242
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, A to B or B to A
(Figures 2 and 4)
2.0
100
4.5
20
6.0
17
125
150
ns
25
30
21
26
tPLZ,
Maximum Propagation Delay, Output Enable to Output A or B
2.0
150
tPHZ
(Figures 3 and 5)
4.5
30
6.0
26
190
225
ns
38
45
33
38
tPZL,
Maximum Propagation Delay, Output Enable to Output A or B
2.0
150
tPZH
(Figures 3 and 5)
4.5
30
6.0
26
190
225
ns
38
45
33
38
tTLH,
tTHL
Maximum Output Transition Time, Any Output
(Figures 2 and 4)
2.0
60
4.5
12
6.0
10
75
90
ns
15
18
13
15
Cin
Maximum Input Capacitance
10
10
10
pF
Cout
Maximum Three–State Output Capacitance (Output in High Impedance
15
State)
15
15
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 Transceiver)*
31
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).
PIN DESCRIPTIONS
DATA PORTS
A1–A4 (Pins 3,4,5,6) and B1–B4 (Pins 11,10,9,8)
Data on these pins may be transferred between data
buses. Depending upon the states of the Output Enables,
these pins may be inputs, outputs or open circuits (high–im-
pedance).
CONTROL INPUTS
A–to–B Enable (Pin 1) and B–to–A Enable (Pin 13)
Data on these Output Enables determine both the direc-
tion of the data flow (from A to B or from B to A) and the
states of the outputs (standard or high impedance), accord-
ing to the Function Table.
High–Speed CMOS Logic Data
3
DL129 — Rev 6
MOTOROLA
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