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CD74HC14 Datasheet(PDF) 6 Page - Texas Instruments

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Part No. CD74HC14
Description  High Speed CMOS Logic Hex Inverting Schmitt Trigger
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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6
Switching Specifications Input tr, tf = 6ns
PARAMETER
SYMBOL
TEST
CONDITIONS
VCC
(V)
25oC
-40oC TO 85oC
-55oC TO 125oC
UNITS
MIN
TYP
MAX
MIN
MAX
MIN
MAX
HC TYPES
Propagation Delay,
A to Y
tPLH, tPHL CL = 50pF
2
-
-
135
-
170
-
205
ns
CL = 50pF
4.5
-
-
27
-
34
-
41
ns
CL = 15pF
5
-
11
-
----
ns
CL = 50pF
6
-
-
23
-
29
-
35
ns
Output Transition Times
tTLH, tTHL CL = 50pF
2
-
-
75
-
95
18
110
ns
4.5
-
-
15
-
19
-
22
ns
6
-
-
13
-
16
-
19
ns
Input Capacitance
CI
-
-
-
-
10
-
10
-
10
pF
Power Dissipation Capacitance
(Notes 5, 6)
CPD
-
5
-
20
-
----
pF
HCT TYPES
Propagation Delay,
A to Y
tPLH, tPHL CL = 50pF
4.5
-
-
38
-
48
-
57
ns
CL = 15pF
5
-
16
-
----
ns
Output Transition Times
tTLH, tTHL CL = 50pF
4.5
-
-
15
-
19
-
22
ns
Input Capacitance
CI
-
-
-
-
10
-
10
-
10
pF
Power Dissipation Capacitance
(Notes 5, 6)
CPD
-
5
-
20
-
----
pF
NOTES:
5. CPD is used to determine the dynamic power consumption, per inverter.
6. PD = VCC
2 f
i (CPD + CL) where fi = input frequency, CL = output load capacitance, VCC = supply voltage.
Test Circuits and Waveforms
FIGURE 4. HC TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
FIGURE 5. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
tPHL
tPLH
tTHL
tTLH
90%
50%
10%
50%
10%
INVERTING
OUTPUT
INPUT
GND
VCC
tr = 6ns
tf = 6ns
90%
tPHL
tPLH
tTHL
tTLH
2.7V
1.3V
0.3V
1.3V
10%
INVERTING
OUTPUT
INPUT
GND
3V
tr = 6ns
tf = 6ns
90%




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