Datasheet

UNISONIC TECHNOLOGIES CO., LTD
U74CBT3251
CMOS IC
1-OF-8 FET MULTIPLEXER/
DEMULTIPLEXER

DESCRIPTION
The U74CBT3251 is a 1-OF-8 high-speed TTL-compatible FET
multiplexer / demultiplexer. The low on-state resistance of the
switch allows connections to be made with minimal propagation
delay.
When output enable (OE) is low, the U74CBT3251 is enabled.
S0, S1, and S2 select one of the B outputs for the A-input data.

FEATURES
* VCC Operating Range From 4V to 5.5V
* Bidirectional Data Flow, With minimal Propagation Delay
* Low ON-State Resistance (RON) Characteristics (RON =5Ω Typ.)
* Low Power Consumption ICC=3μA (Max)

ORDERING INFORMATION
Ordering Number
U74CBT3251G-R16-R
U74CBT3251G-P16-R

Package
SSOP-16
TSSOP-16
Packing
Tape Reel
Tape Reel
MARKING
SSOP-16
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TSSOP-16
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U74CBT3251
CMOS IC

PIN CONFIGURATION

FUNCTION TABLE
INPUT
OE
S2
S1
S0
L
L
L
L
L
L
L
L
H
L
L
L
L
H
H
H
H
X
L
L
H
H
L
L
H
H
X
L
H
L
H
L
H
L
H
X
FUNCTION
A port=B1 port
A port=B2 port
A port=B3 port
A port=B4 port
A port=B5 port
A port=B6 port
A port=B7 port
A port=B8 port
Disconnect
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U74CBT3251

CMOS IC
LOGIC DIAGRAM
A
SW
B1
B2
SW
B3
SW
B4
SW
SW
B5
SW
B6
B7
SW
SW
B8
OE
S0
S1
S2
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U74CBT3251

CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified)
PARAMETER
Supply Voltage
DC Input Voltage(see Note 2,3)
Control Input Clamp Current
SYMBOL
RATINGS
UNIT
VCC
-0.5 ~ 7
V
VIN
-0.5 ~ 7
V
IIK
-50
mA
IIN(SW)
±128
mA
ON-State Switch Current
IOUT(SW)
Operating Temperature
TOPR
-40~+85
°C
Storage Temperature
TSTG
-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

SYMBOL
SSOP-16
TSSOP-16
θJA
UNIT
°C/W
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
High-Level Control Input Voltage
Low-Level Control Input Voltage
Data Input Voltage
Data Output Voltage
Operating Temperature

RATINGS
90
110
SYMBOL
VCC
VIH
VIL
VIN
VOUT
TA
MIN
4
2
0
0
0
-40
TYP
MAX
5.5
5.5
0.8
5.5
5.5
85
UNIT
V
V
V
V
V
°C
ELECTRICAL CHARACTERISTICS (Ta=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
VIK
II(LEAK)
ICC
∆ICC
CIN
CIO(OFF)
RON
TEST CONDITIONS
VCC =4.5V, IIN = -18mA
VCC =5.5V, VIN =VCC or GND
VCC=5.5 V, IIN /IOUT =0
VIN=VCC or GND, Switch ON or OFF
VCC=5.5V, One input at 3.4V,
Other inputs at VCC or GND
VIN=3V or 0
VCC=5V, VIN/VOUT=3V or 0
VIN=VCC or GND, Switch OFF
VCC=4V, VIN=2.4V, IOUT =-15mA
IOUT =64mA
VCC =4.5V, VIN =0
IOUT =30mA
VCC =4.5V, VIN =2.4V IOUT =-15mA
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MIN TYP MAX UNIT
-1.2
V
±1
µA
3.5
17.5
4
14
5
5
10
3
µA
2.5
mA
20
7
7
15
pF
pF
pF
Ω
Ω
Ω
Ω
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U74CBT3251

CMOS IC
SWITCHING CHARACTERISTICS (CL=50pF, RL=500Ω;see TEST CIRCUIT AND WAVEFORMS)
PARAMETER
From input (A or B) to output
(B or A) (Note)
From input S to output A
SYMBOL
tpd
tpd(s)
From input S to output B
From input OE to output
(A or B)
From input S to output B
ten
TEST CONDITIONS
VCC=4V
VCC= 5V±0.5V
VCC=4V
VCC= 5V±0.5V
VCC=4V
VCC= 5V±0.5V
VCC=4V
VCC= 5V±0.5V
VCC=4V
VCC= 5V±0.5V
VCC=4V
MIN TYP MAX UNIT
0.35 ns
0.25 ns
6.0
ns
2
5.5
ns
6.4
ns
1.5
5.6 ns
6.4
ns
1.6
5.8
ns
1.9
6.8
6.4
6.0
ns
ns
ns
tdis
From input OE to output
VCC= 5V±0.5V
2.3 6.2
ns
(A or B)
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).
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U74CBT3251

CMOS IC
TEST CIRCUIT AND WAVEFORMS
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
VCC
4V
5V±0.5V
4V
5V±0.5V
4V
5V±0.5V
VI
VCC or GND
VCC or GND
GND
GND
VCC
VCC
tR / tF
≤2.5ns
≤2.5ns
≤2.5ns
≤2.5ns
≤2.5ns
≤2.5ns
PROPAGATION DELAY TIMES
V∆
0.3V
0.3V
0.3V
0.3V
VEXT
Open
Open
7V
7V
Open
Open
CL
50pF
50pF
50pF
50pF
50pF
50pF
RL
500Ω
500Ω
500Ω
500Ω
500Ω
500Ω
ENABLE AND DISABLE TIMES
Notes: 1. CL includes probe and jig capacitance.
2. All input pulses are supplied by generators having the following characteristics: PRR≤10MHz,
ZO=50Ω, tr≤2.5ns, tf≤2.5 ns.
3. The outputs are measured one at a time with one transition per measurement.
4. tPLZ and tPHZ are the same as tdis.
5. tPZL and tPZH are the same as ten.
6. tPLH and tPHL are the same as tpd(s).
7. All parameters and waveforms are not applicable to all devices.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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