IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
FAST CMOS
QUAD 2-INPUT
MULTIPLEXER
FEATURES:
•
•
•
•
IDT54/74FCT257T/AT/CT/DT
DESCRIPTION:
•
•
•
•
•
Std., A, C, and D grades
Low input and output leakage
≤
1µA (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
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
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
1
JUNE 2001
DSC-5500/2
© 2002 Integrated Device Technology, Inc.
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
PIN CONFIGURATION
NC
OE
19
18
17
16
15
14
9
10
11
12
13
I
0A
S
I
0A
I
1A
Z
A
I
0B
I
1B
Z
B
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
OE
I
0C
I
1C
Z
C
I
0D
I
1D
Z
D
GND
NC
Z
D
I
1D
Z
B
3
2
1
20
I
1A
Z
A
NC
I
0B
I
1B
S
INDEX
V
CC
4
5
6
7
8
I
0C
I
1C
NC
Z
C
I
0D
CERDIP/ SOIC/ QSOP
TOP VIEW
LCC
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max
–0.5 to +7
–0.5 to V
CC
+0.5
–65 to +150
–60 to +120
Unit
V
V
°C
mA
V
TERM
(2)
Terminal Voltage with Respect to GND
V
TERM
(3)
Terminal Voltage with Respect to GND
T
STG
I
OUT
Storage Temperature
DC Output Current
PIN DESCRIPTION
Pin Names
I
0A
–I
0D
I
1A
–I
1D
OE
S
Z
A
–Z
D
Source 0 Data Inputs
Source 1 Data Inputs
Output Enable (Active LOW)
Select Input
Outputs
Description
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.
FUNCTION TABLE
(1)
Inputs
OE
H
L
S
X
H
H
L
L
I
0
X
X
X
L
H
I
1
X
L
H
X
X
Output Zx
Z
L
H
L
H
CAPACITANCE
(T
A
= +25°C, F = 1.0MHz)
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
L
L
L
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
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
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
CC
= Max.
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
µA
µA
OUTPUT DRIVE CHARACTERISTICS
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
Unit
V
V
mA
µA
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, +25°C 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 ±5µA 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)
V
CC
= Max.
V
IN
= 3.4V
(3)
V
CC
= Max.
Outputs Open
OE
= GND
One Input 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
V
IN
= V
CC
V
IN
= GND
Test Conditions
(1)
Min.
—
—
Typ.
(2)
0.5
0.15
Max.
2
0.25
Unit
mA
mA/
MHz
I
C
Total Power Supply Current
(6)
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
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 Min. or Max., 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
∆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.
4
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - INDUSTRIAL
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Propagation Delay
Ix to Zx
Propagation Delay
S to Zx
Output Enable Time
Output Disable Time
Condition
(1)
C
L
= 50pF
R
L
= 500Ω
FCT257AT
Min.
(2)
Max.
1.5
5
1.5
1.5
1.5
7
7
5.5
FCT275CT
Min.
(2)
1.5
1.5
1.5
1.5
Max.
4.3
5.2
6
5
Min.
(2)
FCT275DT
Max.
1.5
3.9
4.4
4.4
4.4
Unit
ns
ns
ns
ns
1.5
1.5
1.5
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - MILITARY
FCT257T
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Propagation Delay
Ix to Zx
Propagation Delay
S to Zx
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
FCT275AT
Min.
(2)
1.5
1.5
1.5
1.5
Max.
5.8
8.1
8
5.8
FCT275CT
Min.
(2)
Max.
1.5
5
1.5
1.5
1.5
6
6.8
5.3
Unit
ns
ns
ns
ns
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
5
创意市集
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
