CY54/74FCT138T
3
Capacitance[6]
Parameter
Description
Typ.[5]
Max.
Unit
CIN
Input Capacitance
5
10
pF
COUT
Output Capacitance
9
12
pF
Power Supply Characteristics
Parameter
Description
Test Conditions
Typ.[5]
Max.
Unit
ICC
Quiescent Power Supply Current
VCC=Max., VIN<0.2V,
VIN > VCC–0.2V
0.1
0.2
mA
∆I
CC
Quiescent Power Supply Current
(TTL inputs)
VCC=Max., VIN=3.4V,
[8]
f1=0, Outputs Open
0.5
2.0
mA
ICCD
Dynamic Power Supply
Current[9]
VCC=Max., One Input Toggling,
50% Duty Cycle, Outputs Open,
VIN < 0.2V or VIN > VCC–0.2V
0.06
0.12
mA/MHz
IC
Total Power Supply Current[10]
VCC=Max., f1=10 MHz,
50% Duty Cycle, Outputs Open, Toggle
E1, E2, or E3, One Output Toggling,
VIN < 0.2V or VIN > VCC–0.2V
0.7
1.4
mA
VCC=Max., f1=10 MHz,
50% Duty Cycle, Outputs Open, Toggle
E1, E2, or E3, One Output Toggling,
VIN=3.4V or VIN=GND
1.0
2.4
mA
Notes:
8.
Per TTL driven input (VIN=3.4V); all other inputs at VCC or GND.
9.
This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
10. IC
=IQUIESCENT + IINPUTS + IDYNAMIC
IC
=ICC+∆ICCDHNT+ICCD(f0/2 + f1N1)
ICC
=
Quiescent Current with CMOS input levels
∆I
CC =
Power Supply Current for a TTL HIGH input (VIN=3.4V)
DH
=
Duty Cycle for TTL inputs HIGH
NT
=
Number of TTL inputs at DH
ICCD = Dynamic Current caused by an input transition pair (HLH or LHL)
f0
=
Clock frequency for registered devices, otherwise zero
f1
=
Input signal frequency
N1
=
Number of inputs changing at f1
All currents are in milliamps and all frequencies are in megahertz.
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