UNISONIC TECHNOLOGIES CO., LTD
U74CBT3257
4-BIT 1-OF-2 FET
MULTIPLEXER/
DEMULTIPLEXER
DESCRIPTION
The
U74CBT3257
is a 4-bit 1-of-2 high-speed TTL-compatible
FET multiplexer/demultiplexer. The low on-state resistance of the
switch allows connections to be made with minimal propagation
delay.
Output-enable (
OE
) and select-control (S) inputs select the
appropriate B1 and B2 outputs for the A-input data.
CMOS IC
FEATURES
* V
CC
Operating Range From 4V to 5.5V
* Bidirectional Data Flow, With minimal Propagation Delay
* Low ON-State Resistance (R
ON
) Characteristics (R
ON
=5Ω Typ.)
* Low Power Consumption I
CC
=3μA (Max)
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
U74CBT3257L-R16-T
U74CBT3257G-R16-T
U74CBT3257L-R16-R
U74CBT3257G-R16-R
U74CBT3257L-P16-T
U74CBT3257G-P16-T
U74CBT3257L-P16-R
U74CBT3257G-P16-R
Package
SSOP-16
SSOP-16
TSSOP-16
TSSOP-16
Packing
Tube
Tape Reel
Tube
Tape Reel
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QW-R502-922, A
U74CBT3257
PIN CONFIGURATION
Advance
CMOS IC
FUNCTION TABLE
INPUT
OE
S2
L
H
X
INPUT/OUTPUT
A
B1
B2
Z
FUNCTION
A port=B1 port
A port=B2 port
Disconnect
L
L
H
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U74CBT3257
LOGIC DIAGRAM
Advance
CMOS IC
1A
SW
SW
1B1
1B2
2B1
SW
2B2
3B1
SW
3B2
4B1
SW
4B2
2A
SW
3A
SW
4A
SW
S
OE
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U74CBT3257
PARAMETER
Advance
CMOS IC
ABSOLUTE MAXIMUM RATING
(T
A
=25°C, unless otherwise specified)
SYMBOL
RATINGS
UNIT
Supply Voltage
V
CC
-0.5 ~ 7
V
DC Input Voltage(see Note 2,3)
V
IN
-0.5 ~ 7
V
V
IN(SW)
-0.5 ~7
V
DC Switch Voltage(see Note 2,3)
V
OUT(SW)
Control Input Clamp Current
I
IK
-50
mA
DC V
CC
or GND Current
I
CC
±100
mA
I
IN(SW)
±128
mA
ON-State Switch Current
I
OUT(SW)
Storage Temperature
T
STG
-65~+150
°C
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. All voltages are with respect to ground
3. The input and output voltage ratings may be exceeded if the input and output clamp-current ratings are
observed.
THERMAL DATA
PARAMETER
Junction to Ambient
SSOP-16
TSSOP-16
SYMBOL
θ
JA
RATINGS
73
108
UNIT
°C/W
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
High-Level Control Input Voltage
Low-Level Control Input Voltage
Data Input Voltage
Operating Temperature
SYMBOL
V
CC
V
IH
V
IL
V
IN
T
A
MIN
4
2
0
0
-40
TYP
MAX
5.5
5.5
0.8
5.5
85
UNIT
V
V
V
V
°C
ELECTRICAL CHARACTERISTICS
(T
A
=25°C, unless otherwise specified)
PARAMETER
Control Input Clamp Voltage
Input Leakage Current
Quiescent Supply Current
Additional Quiescent Supply
Current
Control Input Capacitance
A Port Input Capacitance
B Port Input Capacitance
ON-Resistance
SYMBOL
V
IK
I
I(LEAK)
I
CC
ΔI
CC
C
IN
C
IO(OFF)
TEST CONDITIONS
V
CC
=4.5V, I
IN
= -18mA
V
CC
=5.5V, V
IN
=V
CC
or GND
V
CC
=5.5 V, I
IN
/I
OUT
=0
V
IN
=V
CC
or GND, Switch ON or OFF
V
CC
=5.5V, One input at 3.4V,
Other inputs at V
CC
or GND
V
IN
=3V or 0 V
CC
=5V
V
IN
/V
OUT
=3V or 0, V
CC
=5V
V
IN
=V
CC
or GND, Switch OFF
V
CC
=4V, V
IN
=2.4V,I
OUT
= -15mA
I
OUT
=64mA
V
CC
=4.5V, V
IN
=0
I
OUT
=30mA
V
CC
=4.5V, V
IN
=2.4V
I
OUT
=-15mA
MIN TYP MAX UNIT
-1.2
V
±1
µA
3
2.5
3.5
6.5
4
14
5
5
10
µA
mA
pF
pF
pF
Ω
Ω
Ω
Ω
R
ON
20
7
7
15
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QW-R502-922.A
U74CBT3257
PARAMETER
Advance
CMOS IC
SWITCHING CHARACTERISTICS
(C
L
=50pF, R
L
=500Ω, see TEST CIRCUIT AND WAVEFORMS)
TEST CONDITIONS
MIN TYP MAX UNIT
0.35 ns
V
CC
=4V
From input (A or B) to output (B or A) (Note)
t
pd
V
CC
= 5V±0.5V
0.25 ns
V
CC
=4V
5.5
ns
From input S to output A
t
pd(s)
V
CC
= 5V±0.5V
1.6 5..0
ns
V
CC
=4V
5.7
ns
From input S to output B
V
CC
= 5V±0.5V
1.6
5.2 ns
t
en
5.6
ns
V
CC
=4V
From input
OE
to output (A or B)
V
CC
= 5V±0.5V
1.8 5.1
ns
V
CC
=4V
5.2
ns
From input S to output B
V
CC
= 5V±0.5V
1.0 5.0
ns
t
dis
V
CC
=4V
5.5
ns
From input
OE
to output (A or B)
V
CC
= 5V±0.5V
2.2 5.5
ns
Note: The propagation delay is the calculated RC time constant of the typical ON-state resistance of the switch and
the specified load capacitance, when driven by an ideal voltage source (zero output impedance).
SYMBOL
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QW-R502-922.A
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