4
Quiescent Device
Current
ICC
VCC or
GND
0
6
-
2
-
20
-
40
A
HCT TYPES
High Level Input
Voltage
VIH
-
4.5 to
5.5
2-
-
2
-
2
-
V
Low Level Input
Voltage
VIL
-
4.5 to
5.5
-
0.8
-
0.8
-
0.8
V
High Level Output
Voltage
CMOS Loads
VOH
VIH or
VIL
-0.02
4.5
4.4
-
4.4
-
4.4
-
V
High Level Output
Voltage
TTL Loads
-4
4.5
3.98
-
3.84
-
3.7
-
V
Low Level Output
Voltage
CMOS Loads
VOL
VIH or
VIL
0.02
4.5
-
0.1
-
0.1
-
0.1
V
Low Level Output
Voltage
TTL Loads
4
4.5
-
0.26
-
0.33
-
0.4
V
Input Leakage
Current
II
VCC
and
GND
0
5.5
-
±0.1
-
±1-
±1
A
Quiescent Device
Current
ICC
VCC or
GND
0
5.5
-
2
-
20
-
40
A
Additional Quiescent
Device Current Per
Input Pin: 1 Unit Load
ICC
(Note 2)
VCC
-2.1
-
4.5 to
5.5
-
100
360
-
450
-
490
A
NOTE:
2. For dual-supply systems theoretical worst case (VI = 2.4V, VCC = 5.5V) specification is 1.8mA.
DC Electrical Specications (Continued)
PARAMETER
SYMBOL
TEST
CONDITIONS
VCC (V)
25oC
-40oC TO 85oC
-55oC TO 125oC
UNITS
VI (V)
IO (mA)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
HCT Input Loading Table
INPUT
UNIT LOADS
All
1
NOTE: Unit Load is
ICC limit specied in DC Electrical
Specications table, e.g. 360
A max at 25oC.
Switching Specications 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, Input to
Output (Figure 1)
tPLH, tPHL CL = 50pF
2
-
110
-
140
-
165
ns
4.5
-
22
-
28
-
33
ns
6
-
19
-
24
-
28
ns
Propagation Delay, Data Input to
Output Y
tPLH, tPHL CL = 15pF
5
-
9
-
----
ns
CD54HC21, CD74HC21, CD74HCT21