IDT74FCT157T/AT/CT/DT
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
A, C and D speed grades
High drive outputs (-15mA I
OH
, 48mA I
OL
)
Power off disable outputs permit “live insertion”
Available in SOIC and QSOP packages
IDT74FCT157T/AT/CT/DT
DESCRIPTION:
The FCT157T 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 FCT157T has a common, active-low, enable input. When the
enable input is not active, all four outputs are held low. A common application
of FCT157T is to move data from two different groups of registers to a
common bus. Another application is as a function generator. The FCT157T
can generate any four of the 16 different functions of two variables with one
variable common.
FUNCTIONAL BLOCK DIAGRAM
S
E
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.
AUGUST 2000
DSC-5502/-
IDT74FCT157T/AT/CT/DT
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
E
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
Storage Temperature
DC Output Current
Max.
–0.5 to +7
–65 to +150
–65 to +120
Unit
V
V
°C
mA
Terminal Voltage with Respect to GND –0.5 to V
CC
+0.5
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
E
S
Z
A
–Z
D
Description
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input (Active LOW)
Select Input
Outputs
FUNCTION TABLE
(1)
Inputs
E
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
N
L
L
H
L
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedance
2
IDT74FCT157T/AT/CT/DT
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
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
Unit
V
V
V
mA
µA
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
IDT74FCT157T/AT/CT/DT
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
E
= GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
fo = 10MHz
50% Duty Cycle
E
= GND
One Bit Toggling
V
CC
= Max.
Outputs Open
fo = 2.5MHz
50% Duty Cycle
E
= 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.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT157T
Symbol
FCT157AT
Min
.
(2)
1.5
1.5
1.5
Max.
5
6
7
FCT157CT
Min
.
(2)
1.5
1.5
1.5
Max.
4.3
4.8
5.2
FCT157DT
Min
.
(2)
1.5
1.5
1.5
Max.
3.9
4.4
4.6
Unit
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Parameter
Propagation Delay I
N
to Z
N
Propagation Delay
E
to Z
N
Propagation Delay S to Z
N
Condition
(1)
C
L
= 50pF
R
L
= 500Ω
Min
.
(2)
1.5
1.5
1.5
Max.
6
10.5
10.5
ns
ns
ns
NOTES:
1. See test circuits and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delay.
4
IDT74FCT157T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
V
CC
500
Ω
V
IN
Pulse
Generator
D.U.T.
50pF
R
T
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
All Other Tests
Open
8-link
7.0V
Switch
Closed
V
OUT
500
Ω
C
L
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse
Generator.
O ctal lin k
SET-UP, HOLD, AND RELEASE TIMES
DATA
INPUT
t
SU
TIM ING
INPUT
ASYNCHRONOUS C ONTROL
PRES ET
CLEAR
ETC.
SYNCHRO NOUS CONTRO L
PRES ET
CLEAR
CLOCK ENABLE
ETC.
t
REM
t
H
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
O ctal lin k
PULSE WIDTH
LO W -HIGH-LOW
PULSE
t
W
HIGH-LOW -HIGH
PULSE
O ctal lin k
1.5V
1.5V
t
SU
t
H
PROPAGATION DELAY
SAM E PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
OPPOSITE P HASE
INPUT TRANSITION
t
PH L
t
PH L
3V
1.5V
0V
V
OH
1.5V
V
OL
3V
1.5V
0V
O ctal lin k
ENABLE AND DISABLE TIMES
ENAB LE
DISA BLE
3V
CO NTROL
INPUT
t
PZL
OUTPUT
NO RM A LLY
LO W
SW ITCH
CLOSE D
t
PZH
OUTPUT
NO RM A LLY
HIGH
SW ITCH
OPEN
3.5V
1.5V
0.3V
t
PHZ
0.3V
1.5V
0V
0V
O ctal lin k
1.5V
t
PLZ
0V
3.5V
V
OL
V
OH
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-
HIGH
2. Pulse Generator for All Pulses: Rate
≤
1.0MHz; t
F
≤
2.5ns; t
R
≤
2.5ns
5
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