CBT3257A
Rev. 6 — 20 June 2019
Quad 1-of-2 multiplexer/demultiplexer
Product data sheet
1. General description
The CBT3257A is a quad 1-of-2 high-speed TTL-compatible multiplexer/demultiplexer. The low ON
resistance of the switch allows inputs to be connected to outputs without adding propagation delay
or generating additional ground bounce noise.
Output enable (OE) and select-control (S) inputs select the appropriate nB1 and nB2 outputs for
the nA input data.
The CBT3257A is characterized for operation from -40 °C to +85 °C.
2. Features and benefits
•
•
•
•
•
5 Ω switch connection between two ports
TTL-compatible input levels
Minimal propagation delay through the switch
Latch-up protection exceeds 100 mA per JEDEC standard JESD78 class II level A
ESD protection:
•
HBM JESD22-A114F exceeds 2000 V
•
MM JESD22-A115-A exceeds 200 V
•
CDM JESD22-C101E exceeds 1000 V
Multiple package options
Specified from -40 °C to +85 °C
•
•
3. Ordering information
Table 1. Ordering information
Type number
Temperature range
CBT3257AD
CBT3257ADB
CBT3257ADS
CBT3257APW
CBT3257ABQ
-40 °C to +85 °C
-40 °C to +85 °C
-40 °C to +85 °C
-40 °C to +85 °C
-40 °C to +85 °C
Package
Name
SO16
SSOP16
SSOP16[1]
TSSOP16
DHVQFN16
Description
plastic small outline package; 16 leads;
body width 3.9 mm
plastic shrink small outline package; 16 leads;
body width 5.3 mm
plastic shrink small outline package; 16 leads;
body width 3.9 mm; lead pitch 0.635 mm
plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
plastic dual in-line compatible thermal enhanced
very thin quad flat package; no leads; 16 terminals;
body 2.5 x 3.5 x 0.85 mm
Version
SOT109-1
SOT338-1
SOT519-1
SOT403-1
SOT763-1
[1]
Also known as QSOP16.
Nexperia
CBT3257A
Quad 1-of-2 multiplexer/demultiplexer
4. Functional diagram
1A
4
2
3
7
5
6
9
11
10
12
14
13
1B1
1B2
2B1
2B2
3B1
3B2
4B1
4B2
2A
3A
4A
S
1
OE
15
002aab779
Fig. 1.
Logic diagram
5. Pinning information
5.1. Pinning
CBT3257A
S
1B1
1B2
1A
2B1
2B2
2A
GND
1
2
3
4
5
6
7
8
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16 V
CC
15 OE
14 4B1
13 4B2
12 4A
11 3B1
10 3B2
9
3A
CBT3257A
S
1B1
1B2
1A
2B1
2B2
2A
GND
1
2
3
4
5
6
7
8
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16 V
CC
15 OE
14 4B1
13 4B2
12 4A
11 3B1
10 3B2
9
3A
Fig. 2.
Pin configuration SOT109-1 (SO16) and
SOT519-1 (SSOP16)
Fig. 3.
Pin configuration SOT338-1 (SSOP16) and
SOT403-1 (TSSOP16)
CBT3257A
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 20 June 2019
2 / 14
Nexperia
CBT3257A
Quad 1-of-2 multiplexer/demultiplexer
CBT3257A
terminal 1
index area
1B1
1B2
1A
2B1
2B2
2A
2
3
4
5
6
7
8
GND
3A
9
GND
(1)
16 V
CC
15 OE
14 4B1
13 4B2
12 4A
11 3B1
10 3B2
S
1
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Transparent top view
(1) This is not a ground pin. There is no electrical or mechanical requirement to solder the pad. In case soldered,
the solder land should remain floating or connected to GND.
Fig. 4.
Pin configuration SOT763-1 (DHVQFN16)
5.2. Pin description
Table 2. Pin description
Symbol
S
1B1, 2B1, 3B1, 4B1,
1B2, 2B2, 3B2, 4B2
1A, 2A, 3A, 4A
GND
OE
V
CC
Pin
1
2, 5, 11, 14
3, 6, 10, 13
4, 7, 9, 12
8
15
16
Description
select control input
B1 outputs/inputs
B2 outputs/inputs
A inputs/outputs
ground (0 V)
output enable (active LOW)
positive supply voltage
6. Functional description
Table 3. Function selection
H = HIGH voltage level; L = LOW voltage level; X = Don’t care.
Inputs
OE
L
L
H
S
L
H
X
nA to nB1
nA to nB2
switch off
Switch
7. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
V
CC
V
I
I
SW
supply voltage
input voltage
switch current
continuous current through each switch
[1]
Conditions
Min
-0.5
-0.5
-
Max
+7.0
+7.0
128
Unit
V
V
mA
CBT3257A
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 20 June 2019
3 / 14
Nexperia
CBT3257A
Quad 1-of-2 multiplexer/demultiplexer
Conditions
V
I
< 0 V
T
amb
= -40 °C to +85 °C
SO16, (T)SSOP16 and DHVQFN16 packages
-
500
mW
Min
-50
-65
Max
-
+150
Unit
mA
°C
Symbol Parameter
I
IK
T
stg
P
tot
input clamping current
storage temperature
total power dissipation
[1]
The input and output negative voltage ratings may be exceeded if the input and output clamp current ratings are observed.
8. Recommended operating conditions
Table 5. Operating conditions
All unused control inputs of the device must be held at V
CC
or GND to ensure proper device operation.
Symbol
V
CC
V
IH
V
IL
T
amb
Parameter
supply voltage
HIGH-level input voltage
LOW-level input voltage
ambient temperature
operating in free-air
Conditions
Min
4.5
2.0
-
-40
Max
5.5
-
0.8
+85
Unit
V
V
V
°C
9. Static characteristics
Table 6. Static characteristics
T
amb
= -40 °C to +85 °C.
Symbol
V
IK
V
pass
I
I
I
CC
ΔI
CC
C
I
C
io(off)
R
ON
Parameter
input clamping voltage
pass voltage
input leakage current
supply current
additional supply current
input capacitance
off-state input/output capacitance
ON resistance
Conditions
V
CC
= 4.5 V; I
I
= -18 mA
V
I
= V
CC
= 5.0 V; I
O
= -100 μA
V
CC
= 5.5 V; V
I
= GND or 5.5 V
V
CC
= 5.5 V; I
O
= 0 mA;
V
I
= V
CC
or GND
per input; V
CC
= 5.5 V; one input at
[2]
3.4 V, other inputs at V
CC
or GND
control pins; V
I
= 3 V or 0 V
A port; V
O
= 3 V or 0 V; OE = V
CC
B port; V
O
= 3 V or 0 V; OE = V
CC
V
CC
= 4.5 V
V
I
= 0 V; I
I
= 64 mA
V
I
= 0 V; I
I
= 30 mA
V
I
= 2.4 V; I
I
= 15 mA
[1]
[2]
[3]
Min
-
3.6
-
-
-
-
-
-
[3]
-
-
-
Typ[1]
-
3.9
-
-
-
3.3
9.9
6.4
5
5
10
Max
-1.2
4.2
±1
3
2.5
-
-
-
7
7
15
Unit
V
V
μA
μA
mA
pF
pF
pF
Ω
Ω
Ω
All typical values are measured at V
CC
= 5 V; T
amb
= 25 °C.
This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
CC
or GND.
Measured by the voltage drop between the nA and the nBn terminals at the indicated current through the switch. The lowest voltage of
the two (nA or nBn) terminals determines the ON resistance.
CBT3257A
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 20 June 2019
4 / 14
Nexperia
CBT3257A
Quad 1-of-2 multiplexer/demultiplexer
10. Dynamic characteristics
Table 7. Dynamic characteristics
T
amb
= -40 °C to +85 °C; V
CC
= 4.5 V to 5.5 V; for test circuit see
Fig. 7.
Symbol
t
pd
t
en
t
dis
Parameter
propagation delay
enable time
disable time
Conditions
nA to nBn or nBn to nA; see
Fig. 5
S to nA; see
Fig. 5
OE to nA or nBn; see
Fig. 6
S to nBn; see
Fig. 6
OE to nA or nBn; see
Fig. 6
S to nBn; see
Fig. 6
[1]
[2]
Min
[1][2]
[1][2]
[2]
[2]
[2]
[2]
-
1.4
1.5
1.4
2.2
1.0
Max
0.25
5.0
5.1
5.2
5.5
5.0
Unit
ns
ns
ns
ns
ns
ns
This parameter is warranted but not production tested. The propagation delay is based on the RC time constant of the typical ON
resistance of the switch and a load capacitance, when driven by an ideal voltage source (zero output impedance).
t
PLH
and t
PHL
are the same as t
pd
; t
PZL
and t
PZH
are the same as t
en
; t
PLZ
and t
PHZ
are the same as t
dis
.
10.1. Waveforms and test circuit
V
I
input
0V
t
PHL
V
OH
output
V
OL
V
M
V
M
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V
M
V
M
t
PLH
Measurement points are given in
Table 8.
V
OL
and V
OH
are typical voltage output levels that occur with the output load.
Fig. 5.
The input (nA; nBn) to output (nBn; nA) or input (S) to output (nA) propagation delay times
V
I
OE, S input
GND
t
PLZ
output
LOW-to-OFF
OFF-to-LOW
V
CC
V
M
V
OL
t
PHZ
V
OH
output
HIGH-to-OFF
OFF-to-HIGH
GND
outputs
enabled
V
Y
V
M
outputs
disabled
outputs
enabled
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V
M
t
PZL
V
X
t
PZH
Measurement points are given in
Table 8.
V
OL
and V
OH
are typical voltage output levels that occur with the output load.
Fig. 6.
Enable and disable times
CBT3257A
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 6 — 20 June 2019
5 / 14
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