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IDT74FCT2257T/AT/CT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
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, and C speed grades
Resistor output
(-15mA I
OH
, 12mA I
OL
)
Reduced system switching noise
Available in SOIC and QSOP packages
IDT74FCT2257T/AT/CT
DESCRIPTION:
The FCT2257T 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 2257T 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.
The FCT2257T has balanced output drive with current limiting resistors.
This offers low ground bounce, minimal undershoot and controlled output
fall times-reducing the need for external series terminating resistors.
FCT2257T parts are plug-in replacements for FCT257T parts.
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
INDUSTRIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
JULY 2000
DSC-5501/-
IDT74FCT2257T/AT/CT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
S
I
0A
I
1A
Z
A
I
0B
I
1B
Z
B
GND
1
2
3
4
5
6
7
8
SO16-1
SO16-7
SO16-8
16
15
14
13
12
11
10
9
V
CC
OE
I
0C
I
1C
Z
C
I
0D
I
1D
Z
D
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
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.
CAPACITANCE
(T
A
= +25
O
C, f = 1.0MHz)
SOIC/ QSOP
TOP VIEW
Symbol
C
IN
C
OUT
Parameter
(1)
Input Capacitance
Output Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
6
8
Max.
10
12
Unit
pF
pF
8T-link
NOTE:
1. This parameter is measured at characterization but not tested.
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
FUNCTION TABLE
(1)
Inputs
OE
H
L
L
L
L
S
X
H
H
L
L
I
0
X
X
X
L
H
I
1
X
L
H
X
X
Outputs
Z
L
H
L
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedance
2
IDT74FCT2257T/AT/CT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
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%
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
8T-link
Unit
V
V
µA
OUTPUT DRIVE CHARACTERISTICS
Symbol
I
ODL
I
ODH
V
OH
V
OL
Parameter
Output LOW Current
Output HIGH Current
Output HIGH Voltage
Output LOW Voltage
Test Conditions
(1)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –15mA
I
OH
= 12mA
Min
.
16
–16
2.4
—
Typ
.
(2)
48
–48
3.3
0.3
Max.
—
—
—
0.5
Unit
mA
mA
V
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
IDT74FCT2257T/AT/CT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
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
0.06
Max.
2
0.12
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
—
0.6
2.2
mA
—
0.9
3.2
—
0.6
2.2
(5)
—
1.6
6.2
(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.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT2257T
Symbol
FCT2257AT
Min
.
(2)
1.5
1.5
1.5
1.5
Max.
5
7
7
5.5
FCT2257CT
Min
.
(2)
1.5
1.5
1.5
1.5
Max.
4.3
5.2
6
5
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
NOTES:
1. See test circuits and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delay.
4
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