IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
FAST CMOS
QUAD 2-INPUT
MULTIPLEXER
FEATURES:
−
−
−
−
−
−
−
−
Low input and output leakage
≤1µ
A (max.)
CMOS power levels
True TTL input and output compatibility
•
V
OH
= 3.3V (typ.)
•
V
OL
= 0.3V (typ.)
Meets or exceeds JEDEC standard 18 specifications
Std., A, C and D speed grades
High drive outputs (-15mA I
OH
, 48mA I
OL
)
Power off disable outputs permit “live insertion”
Available in the following packages:
•
Industrial: SOIC, QSOP
•
Military: CERDIP, LCC, CERPACK
IDT54/74FCT257T/AT/CT/DT
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.
FUNCTIONAL BLOCK DIAGRAM
S
Three other multiplexers
I
1B
I
0B
I
1D
I
0D
Z
B
Z
D
I
1A
I
0A
Z
A
OE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
1
c
2001 Integrated Device Technology, Inc.
MAY 2001
DSC-5500/-
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
PIN CONFIGURATION
NC
I
0A
OE
19
18
17
INDEX
S
I
0A
I
1A
Z
A
I
0B
I
1B
Z
B
GND
1
2
3
4
5
6
7
8
D16-1
SO16-1
SO16-7
16
15
14
13
12
11
10
9
V
CC
OE
I
0C
I
1C
Z
C
I
0B
I
0D
I
1D
Z
D
I
1B
7
8
3
S
2
1
20
I
1A
Z
A
NC
V
CC
4
5
6
I
0C
I
1C
NC
Z
C
I
0D
L20-2
16
15
14
9
10
11
12
13
Z
B
GND
CERDIP/ SOIC/ QSOP/ CERPACK
TOP VIEW
LCC
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
T
STG
I
OUT
Rating
Terminal Voltage with Respect to GND
Terminal Voltage with Respect to GND
Storage Temperature
DC Output Current
Max.
–0.5 to +7
–0.5 to V
CC
+0.5
–65 to +150
–60 to +120
Unit
V
V
°C
mA
8T-link
PIN DESCRIPTION
Pin Names
I
0A
–I
0D
I
1A
–I
1D
OE
S
Z
A
–Z
D
Description
Source 0 Data Inputs
Source 1 Data Inputs
Output Enable (Active LOW)
Select Input
Outputs
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. Outputs and I/O terminals only.
FUNCTION TABLE
(1)
Inputs
OE
H
L
L
S
X
H
H
L
L
I
0
X
X
X
L
H
I
1
X
L
H
X
X
Z
L
H
L
H
Output Z
N
CAPACITANCE
(T
A
=
Symbol
C
IN
C
OUT
Parameter
(1)
Input Capacitance
Output Capacitance
+25
O
C,
f = 1.0MHz)
Typ.
6
8
Max.
10
12
Unit
pF
pF
8T-link
L
L
Conditions
V
IN
= 0V
V
OUT
= 0V
NOTE:
1. This parameter is measured at characterization but not tested.
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedance
2
NC
I
1D
Z
D
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= -40°C to +85°C, V
CC
= 5.0V ± 5%; Military: T
A
= -55°C to +125°C, V
CC
= 5.0V ± 10%
Symbol
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
I
I
V
IK
V
H
I
CC
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current
(4)
Input LOW Current
(4)
High Impedance Output Current
(3-State Output pins)
(4)
Input HIGH Current
(4)
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= Max., V
I
= V
CC
(Max.)
V
CC
= Min., I
IN
= –18mA
—
V
CC
= Max., V
IN
= GND or V
CC
V
CC
= Max.
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
I
= 2.7V
V
I
= 0.5V
V
O
= 2.7V
V
O
= 0.5V
Min.
2
—
—
—
—
—
—
—
—
—
Typ.
(2)
—
—
—
—
—
—
—
–0.7
200
0.01
Max.
—
0.8
±1
±1
±1
±1
±1
–1.2
—
1
µA
V
mV
mA
Unit
V
V
µA
OUTPUT DRIVE CHARACTERISITICS
Symbol
V
OH
V
OL
I
OS
I
OFF
Parameter
Output HIGH Voltage
Output LOW Voltage
Short Circuit Current
Input/Output Power Off Leakage
(5)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Max., V
O
= GND
(3)
V
CC
= 0V, V
IN
or V
O
≤
4.5V
Test Conditions
(1)
I
OH
= –8mA
I
OH
= –15mA
I
OL
= 48mA
Min.
2.4
2
—
–60
—
Typ
.
(2)
3.3
3
0.3
–120
—
Max.
—
—
0.5
–225
±1
V
mA
µA
Unit
V
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. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.
4. The test limit for this parameter is ±5µ A at T
A
= –55°C.
5. This parameter is guaranteed but not tested.
3
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND INDUSTRIAL 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
OE
= GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
fo = 10MHz
50% Duty Cycle
OE
= GND
One Bit Toggling
V
CC
= Max.
Outputs Open
fo = 2.5MHz
50% Duty Cycle
OE
= GND
Four Bits Toggling
Min
.
—
—
Typ
.
(2)
0.5
0.15
Max.
2
0.25
Unit
mA
mA/
MHz
V
IN
= V
CC
V
IN
= GND
I
C
Total Power Supply Current
(6)
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
—
1.5
3.5
mA
—
1.8
4.5
—
1.5
3.5
(5)
—
2.5
7.5
(5)
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.
4
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - INDUSTRIAL
FCT257T
Symbol
FCT257AT
Min
.
(2)
1.5
1.5
1.5
1.5
Max.
5
7
7
5.5
FCT257CT
Min
.
(2)
1.5
1.5
1.5
1.5
Max.
4.3
5.2
6
5
FCT257DT
Min
.
(2)
1.5
1.5
1.5
1.5
Max.
3.9
4.4
4.4
4.4
Unit
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Propagation Delay I
N
to Z
N
Propagation Delay S to Z
N
Output Enable Time
Output Disable Time
Condition
(1)
C
L
= 50pF
R
L
= 500Ω
Min
.
(2)
1.5
1.5
1.5
1.5
Max.
6
10.5
8.5
6
ns
ns
ns
ns
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - MILITARY
FCT257T
Symbol
FCT257AT
Min
.
(2)
1.5
1.5
1.5
1.5
Max.
5.8
8.1
8
5.8
FCT257CT
Min
.
(2)
1.5
1.5
1.5
1.5
Max.
5
6
6.8
5.3
Unit
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Propagation Delay I
N
to Z
N
Propagation Delay S to Z
N
Output Enable Time
Output Disable Time
Condition
(1)
C
L
= 50pF
R
L
= 500Ω
Min
.
(2)
1.5
1.5
1.5
1.5
Max.
7
12
10
8
ns
ns
ns
ns
NOTES:
1. See test circuits and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delay.
5
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