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
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply Current
(4)
Test Conditions
(1)
V
CC
= Max.
V
IN
= 3.4
(3)
V
CC
= Max.
Outputs Open
E
or
OE
= GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
f
O
= 10MHz
50% Duty Cycle
E
Min.
—
FCTxxxT
—
Typ.
(2)
0.5
0.15
Max.
2.0
0.25
Unit
mA
mA/
MHz
V
IN
= V
CC
V
IN
= GND
FCT2xxxT
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4
V
IN
= GND
FCTxxxT
FCT2xxxT
FCTxxxT
FCT2xxxT
FCTxxxT
FCT2xxxT
FCTxxxT
FCT2xxxT
—
—
—
—
0.06
1.5
0.6
1.8
0.9
0.12
3.5
2.2
4.5
3.2
3.5
(5)
2.2
(5)
7.5
(5)
6.2
(5)
2537 tbl 06
I
C
Total Power Supply Current
(6)
mA
or
OE
= GND
—
1.5
0.6
2.5
1.6
One Bit Toggling
V
CC
= Max.
Outputs Open
f
O
= 2.5MHz
50% Duty Cycle
E
or
OE
= GND
Four Bits Toggling
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 V
CC
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at V
CC
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 I
CC
formula. These limits are guaranteed but not tested.
6. I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
o
N
o
)
I
CC
= Quiescent Current
∆I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Output Transition Pair (HLH or LHL)
f
o
= Output Frequency
N
o
= Number of Outputs at f
o
All currents are in milliamps and all frequencies are in megahertz.
6.6
4
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
