IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT- 2257T/AT/CT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Test Conditions(1)
Min. Typ.(2) Max.
Unit
∆ICC
VCC = Max.
VIN = 3.4(3)
—
0.5
2.0
mA
ICCD
Dynamic Power Supply Current(4) VCC = Max.
VIN = VCC
VIN = GND
FCTxxxT
—
0.15
0.25
mA/
MHz
Outputs Open
E or OE = GND
One Bit Toggling
50% Duty Cycle
VCC = Max.
FCT2xxxT
FCTxxxT
—
0.06
0.12
IC
Total Power Supply Current(6)
VIN = VCC
—
—
1.5
0.6
3.5
2.2
mA
Outputs Open
fO = 10MHz
VIN = GND FCT2xxxT
50% Duty Cycle
E or OE = GND
One Bit Toggling
VCC = Max.
VIN = 3.4
FCTxxxT
—
—
1.8
4.5
VIN = GND FCT2xxxT
VIN = VCC FCTxxxT
VIN = GND FCT2xxxT
0.9
1.5
0.6
3.2
3.5(5)
2.2(5)
Outputs Open
fO = 2.5MHz
50% Duty Cycle
E or OE = GND
Four Bits Toggling
VIN = 3.4
FCTxxxT
2.5
1.6
7.5(5)
6.2(5)
VIN = GND FCT2xxxT
2537 tbl 06
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Per TTL driven input (VIN = 3.4V); all other inputs at VCC or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
5. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (foNo)
ICC = Quiescent Current
∆ICC = 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 Output Transition Pair (HLH or LHL)
fo = Output Frequency
No = Number of Outputs at fo
All currents are in milliamps and all frequencies are in megahertz.
6.6
4
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