CBT3251
1-of-8 FET multiplexer/demultiplexer
Rev. 3 — 16 March 2016
Product data sheet
1. General description
The CBT3251 is a 1-of-8 high-speed TTL-compatible FET 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.
When output enable (OE) is LOW, the CBT3251 is enabled. S0, S1 and S2 select one of
the Bn outputs for the A input data.
The CBT3251 is characterized for operation from
40 C
to +85
C.
2. Features and benefits
5
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-A114E exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
CDM JESD22-C101C exceeds 1000 V
Multiple package options
Specified from
40 C
to +85
C
3. Ordering information
Table 1.
Ordering information
Temperature range
40 C
to +85
C
40 C
to +85
C
40 C
to +85
C
Package
Name
CBT3251D
CBT3251DB
CBT3251PW
SO16
SSOP16
TSSOP16
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 thin shrink small outline package; 16 leads;
body width 4.4 mm
Version
SOT109-1
SOT338-1
SOT403-1
Type number
Nexperia
CBT3251
1-of-8 FET multiplexer/demultiplexer
4. Functional diagram
Fig 1.
Logic diagram
CBT3251
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 3 — 16 March 2016
2 of 14
Nexperia
CBT3251
1-of-8 FET multiplexer/demultiplexer
5. Pinning information
5.1 Pinning
Fig 2.
Pin configuration SOT109-1 (SO16)
Fig 3.
Pin configuration SOT338-1 (SSOP16) and
SOT403-1 (TSSOP16)
5.2 Pin description
Table 2.
Symbol
B1, B2, B3, B4, B5, B6, B7, B8
A
n.c.
OE
S2, S1, S0
GND
V
CC
Pin description
Pin
1, 2, 3, 4, 12, 13, 14, 15
5
6
7
9, 10, 11
8
16
Description
B outputs/inputs
A input/output
not connected
output enable (active LOW)
select control input
ground (0 V)
positive supply voltage
CBT3251
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 3 — 16 March 2016
3 of 14
Nexperia
CBT3251
1-of-8 FET multiplexer/demultiplexer
6. Functional description
Table 3.
Function selection
H = HIGH voltage level; L = LOW voltage level; X = Don’t care.
Inputs
OE
L
L
L
L
L
L
L
L
H
S2
L
L
L
L
H
H
H
H
X
S1
L
L
H
H
L
L
H
H
X
S0
L
H
L
H
L
H
L
H
X
A to B1
A to B2
A to B3
A to B4
A to B5
A to B6
A to B7
A to B8
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
I
IK
T
stg
P
tot
supply voltage
input voltage
switch current
input clamping current
storage temperature
total power dissipation
T
amb
=
40 C
to +85
C
SO16 package
SSOP16 package
TSSOP16 package
[1]
[2]
[3]
[2]
[3]
[3]
[1]
Conditions
Min
0.5
0.5
-
50
65
-
-
-
Max
+7.0
+7.0
128
-
+150
500
500
500
Unit
V
V
mA
mA
C
mW
mW
mW
continuous current through each switch
V
I
< 0 V
The input and output negative voltage ratings may be exceeded if the input and output clamp current ratings are observed.
For SO16 package: P
tot
derates linearly with 8 mW/K above 70
C.
For SSOP16 and TSSOP16 package: P
tot
derates linearly with 5.5 mW/K above 70
C.
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
CBT3251
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 3 — 16 March 2016
4 of 14
Nexperia
CBT3251
1-of-8 FET multiplexer/demultiplexer
9. Static characteristics
Table 6.
Static characteristics
T
amb
=
40
C to +85
C.
Symbol
V
IK
V
pass
I
I
I
CC
I
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 A
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
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 V
V
I
= 2.4 V; I
I
= 15 mA
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]
[4]
Typical value is measured at V
CC
= 5 V; T
amb
= 25
C.
Typical value is measured at V
CC
= 4 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 A and the Bn terminals at the indicated current through the switch. The lowest voltage of the
two (A or Bn) terminals determines the ON resistance.
[3]
[1]
Min
-
3.6
-
-
-
-
-
-
-
-
-
-
Typ
-
3.9
-
-
-
3.5
17.5
4.0
5
5
5
10
Max
1.2
4.2
1
3
2.5
-
-
-
20
7
7
15
Unit
V
V
A
A
mA
pF
pF
pF
[1]
[1]
[1]
[4]
[2]
[4]
[1]
[1]
[1]
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
Figure 6.
Symbol
t
pd
t
en
t
dis
Parameter
propagation delay
enable time
disable time
Conditions
A to Bn or Bn to A; see
Figure 4
Sn to A; see
Figure 4
OE to A or Bn; see
Figure 5
Sn to Bn; see
Figure 5
OE to A or Bn; see
Figure 5
Sn to Bn; see
Figure 5
[1]
[2]
[1][2]
[1][2]
[2]
[2]
[2]
[2]
Min
-
1.5
1.5
1.6
1.9
2.3
Max
0.25
5.5
5.6
5.8
6.4
6.2
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
.
CBT3251
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2017. All rights reserved
Product data sheet
Rev. 3 — 16 March 2016
5 of 14
