MC74HCT244A 查看數據表（PDF） - ON Semiconductor
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MC74HCT244A
ON Semiconductor
MC74HCT244A Datasheet PDF : 8 Pages
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MC74HCT244A
AC ELECTRICAL CHARACTERISTICS (VCC = 5.0 V ± 10%, CL = 50 pF, Input tr = tf = 6 ns)
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Guaranteed Limit
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Symbol
Parameter
– 55 to 25_C v 85_C v 125_C Unit
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH,
tPHL
Maximum Propagation Delay, A to YA or B to YB
(Figures 1 and 3)
20
25
30
ns
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLZ,
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPHZ
Maximum Propagation Delay, Output Enable to YA or YB
(Figures 2 and 4)
26
33
39
ns
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPZL,
tPZH
Maximum Propagation Delay, Output Enable to YA or YB
(Figures 2 and 4)
22
28
33
ns
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tTLH,
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tTHL
Maximum Output Transition Time, Any Output
(Figures 1 and 3)
12
15
18
ns
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Cin Maximum Input Capacitance
10
10
10
pF
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Cout Maximum Three−State Output Capacitance
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ (Output in High−Impedance State)
15
15
15
pF
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ NOTE:For propagation delays with loads other than 50 pF, and information on typical parametric values, see Chapter 2 of the ON
Semiconductor High−Speed CMOS Data Book (DL129/D).
Typical @ 25°C, VCC = 5.0 V
CPD Power Dissipation Capacitance (Per Enabled Output)*
55
pF
* Used to determine the no−load dynamic power consumption: PD = CPD VCC2f + ICC VCC. For load considerations, see Chapter 2 of the
ON Semiconductor High−Speed CMOS Data Book (DL129/D).
SWITCHING WAVEFORMS
tr
INPUT
A OR B
tPLH
OUTPUT
YA OR YB
2.7 V
1.3 V
0.3 V
90%
1.3 V
10%
tTLH
Figure 2.
tf
3V
GND
tPHL
tTHL
ENABLE
A OR B
OUTPUT Y
OUTPUT Y
1.3 V
tPZL
tPLZ
1.3 V
tPZH tPHZ
1.3 V
Figure 3.
3V
GND
HIGH
IMPEDANCE
10% VOL
90% VOH
HIGH
IMPEDANCE
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