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MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
1
JUNE 2001
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
2002 Integrated Device Technology, Inc.
DSC-5500/2
FEATURES:
Std., A, C, and D grades
Low input and output leakage
1A (max.)
CMOS power levels
True TTL input and output compatibility:
V
OH
= 3.3V (typ.)
V
OL
= 0.3V (typ.)
High Drive outputs (-15mA I
OH
, 48mA I
OL
)
Meets or exceeds JEDEC standard 18 specifications
Military product compliant to MIL-STD-883, Class B and DESC
listed (dual marked)
Power off disable outputs permit "live insertion"
Available in the following packages:
Industrial: SOIC, QSOP
Military: CERDIP, LCC
FUNCTIONAL BLOCK DIAGRAM
IDT54/74FCT257T/AT/CT/DT
FAST CMOS
QUAD 2-INPUT
MULTIPLEXER
DESCRIPTION:
The FCT257T is a high-speed quad 2-input multiplexer built using an
advanced dual metal CMOS technology. Four bits of data from two sources
can be selected using the common select input. The four buffered outputs
present the selected data in the true (non-inverting) form.
The FCT257T has a common Output Enable (OE) input. When OE is
high, all outputs are switched to a high-impedance state allowing the outputs
to interface directly with bus-oriented systems.
Three other multiplexers
OE
Z
A
Z
B
Z
D
S
I
1B
I
1D
I
0B
I
0D
I
1A
I
0A
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
2
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
PIN CONFIGURATION
Symbol
Description
Max
Unit
V
TERM
(2)
Terminal Voltage with Respect to GND
0.5 to +7
V
V
TERM
(3)
Terminal Voltage with Respect to GND
0.5 to V
CC
+0.5
V
T
STG
Storage Temperature
65 to +150
C
I
OUT
DC Output Current
60 to +120
mA
ABSOLUTE MAXIMUM RATINGS
(1)
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability. No terminal voltage may exceed
Vcc by +0.5V unless otherwise noted.
2. Inputs and Vcc terminals only.
3. Output and I/O terminals only.
Symbol
Parameter
(1)
Conditions
Typ.
Max.
Unit
C
IN
Input Capacitance
V
IN
= 0V
6
10
pF
C
OUT
Output Capacitance
V
OUT
= 0V
8
12
pF
CAPACITANCE
(T
A
= +25C, F = 1.0MHz)
NOTE:
1. This parameter is measured at characterization but not tested.
CERDIP/ SOIC/ QSOP
TOP VIEW
PIN DESCRIPTION
Pin Names
Description
I
0A
I
0D
Source 0 Data Inputs
I
1A
I
1D
Source 1 Data Inputs
OE
Output Enable (Active LOW)
S
Select Input
Z
A
Z
D
Outputs
FUNCTION TABLE
(1)
Inputs
OE
S
I
0
I
1
Output Zx
H
X
X
X
Z
L
H
X
L
L
L
H
X
H
H
L
L
L
X
L
L
L
H
X
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
LCC
TOP VIEW
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
S
I
0A
GND
Z
B
I
0B
I
1B
I
1A
OE
I
0C
I
1C
Z
C
I
0D
I
1D
Z
D
V
CC
Z
A
1
2
3
4
5
7
9
6
8
10
11
12
13
14
15
16
17
18
19
20
NC
I
0C
I
1C
Z
C
I
0D
I
0
A
S
Z
B
G
N
D
N
C
Z
D
I
1
D
N
C
V
C
C
O
E
INDEX
I
1A
Z
A
I
1B
NC
I
0B
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
3
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
V
IH
Input HIGH Level
Guaranteed Logic HIGH Level
2
--
--
V
V
IL
Input LOW Level
Guaranteed Logic LOW Level
--
--
0.8
V
I
IH
Input HIGH Current
(4)
V
CC
= Max.
V
I
= 2.7V
--
--
1
A
I
IL
Input LOW Current
(4)
V
CC
= Max.
V
I
= 0.5V
--
--
1
A
I
OZH
High Impedance Output Current
V
CC
= Max
V
O
= 2.7V
--
--
1
A
I
OZL
(3-State output pins)
(4)
V
O
= 0.5V
--
--
1
I
I
Input HIGH Current
(4)
V
CC
= Max., V
I
= V
CC
(Max.)
--
--
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min, I
IN
= -18mA
--
0.7
1.2
V
V
H
Input Hysteresis
--
--
200
--
mV
I
CC
Quiescent Power Supply Current
V
CC
= Max., V
IN
= GND or V
CC
--
0.01
1
mA
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= 40C to +85C, V
CC
= 5.0V 5%; Military: T
A
= 55C to +125C, V
CC
= 5.0V 10%
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. The test limit for this parameter is 5A at T
A
= 55C.
5. This parameter is guaranteed but not tested.
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
= Min
I
OH
= 8mA
2.4
3.3
--
V
V
IN
= V
IH
or V
IL
I
OH
= 15mA
2
3
--
V
OL
Output LOW Voltage
V
CC
= Min
I
OL
= 48mA
--
0.3
0.5
V
V
IN
= V
IH
or V
IL
I
OS
Short Circuit Current
V
CC
= Max., V
O
= GND
(3)
60
120
225
mA
I
OFF
Input/Output Power Off Leakage
(5)
V
CC
= 0V, V
IN
or V
O
4.5V
--
--
1
A
OUTPUT DRIVE CHARACTERISTICS
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
4
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
I
CC
Quiescent Power Supply Current
V
CC
= Max.
--
0.5
2
mA
TTL Inputs HIGH
V
IN
= 3.4V
(3)
I
CCD
Dynamic Power Supply
V
CC
= Max.
V
IN
= V
CC
--
0.15
0.25
mA/
Current
(4)
Outputs Open
V
IN
= GND
MHz
OE = GND
One Input Toggling
50% Duty Cycle
I
C
Total Power Supply Current
(6)
V
CC
= Max.
V
IN
= V
CC
--
1.5
3.5
mA
Outputs Open
V
IN
= GND
fo = 10MHz
50% Duty Cycle
V
IN
= 3.4V
--
1.8
4.5
OE = GND
V
IN
= GND
One Bit Toggling
V
CC
= Max.
V
IN
= V
CC
--
1.5
3.5
(5)
Outputs Open
V
IN
= GND
fo = 2.5MHz
50% Duty Cycle
V
IN
= 3.4V
--
2.5
7.5
(5)
OE = GND
V
IN
= GND
Four Bits Toggling
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25C 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
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 Input 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.
POWER SUPPLY CHARACTERISTICS
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
5
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
FCT257AT
FCT275CT
FCT275DT
Symbol
Parameter
Condition
(1)
Min.
(2)
Max.
Min.
(2)
Max.
Min.
(2)
Max.
Unit
t
PLH
Propagation Delay
C
L
= 50pF
1.5
5
1.5
4.3
1.5
3.9
ns
t
PHL
Ix to Zx
R
L
= 500
t
PLH
Propagation Delay
1.5
7
1.5
5.2
1.5
4.4
ns
t
PHL
S to Zx
t
PZH
Output Enable Time
1.5
7
1.5
6
1.5
4.4
ns
t
PZL
t
PHZ
Output Disable Time
1.5
5.5
1.5
5
1.5
4.4
ns
t
PLZ
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - INDUSTRIAL
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
FCT257T
FCT275AT
FCT275CT
Symbol
Parameter
Condition
(1)
Min.
(2)
Max.
Min.
(2)
Max.
Min.
(2)
Max.
Unit
t
PLH
Propagation Delay
C
L
= 50pF
1.5
7
1.5
5.8
1.5
5
ns
t
PHL
Ix to Zx
R
L
= 500
t
PLH
Propagation Delay
1.5
12
1.5
8.1
1.5
6
ns
t
PHL
S to Zx
t
PZH
Output Enable Time
1.5
10
1.5
8
1.5
6.8
ns
t
PZL
t
PHZ
Output Disable Time
1.5
8
1.5
5.8
1.5
5.3
ns
t
PLZ
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - MILITARY
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