CBT3251
1-of-8 FET multiplexer/demultiplexer
Rev. 01 — 21 December 2005
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 B outputs for the A-input data.
The CBT3251 is characterized for operation from
−40 °C
to +85
°C.
2. Features
5
Ω
switch connection between two ports
TTL-compatible input levels
Minimal propagation delay through the switch
ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115 and 1000 V CDM per JESD22-C101
s
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
s
s
s
s
3. Ordering information
Table 1:
Ordering information
T
amb
=
−
40
°
C to +85
°
C.
Type number
CBT3251D
CBT3251DB
CBT3251DS
CBT3251PW
Topside mark Package
Name
CBT3251D
CT3251
CBT3251
CBT3251
SO16
SSOP16
SSOP16
[1]
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 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
Version
SOT109-1
SOT338-1
SOT519-1
SOT403-1
[1]
Also known as QSOP16.
Philips Semiconductors
CBT3251
1-of-8 FET multiplexer/demultiplexer
4. Functional diagram
CBT3251
A
5
4
3
2
1
15
14
13
12
B1
B2
B3
B4
B5
B6
B7
B8
OE
S0
S1
S2
7
11
10
9
002aab820
Fig 1. Logic diagram of CBT3251 (positive logic)
CBT3251_1
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 21 December 2005
2 of 16
Philips Semiconductors
CBT3251
1-of-8 FET multiplexer/demultiplexer
5. Pinning information
5.1 Pinning
B4
B3
B2
B1
A
n.c.
OE
GND
1
2
3
4
16 V
CC
15 B5
14 B6
13 B7
B4
B3
B2
B1
A
n.c.
1
2
3
4
5
6
7
8
002aab817
16 V
CC
15 B5
14 B6
13 B7
12 B8
11 S0
10 S1
9
S2
CBT3251D
5
6
7
8
002aab816
12 B8
11 S0
10 S1
9
S2
CBT3251DB
OE
GND
Fig 2. Pin configuration for SO16
Fig 3. Pin configuration for SSOP16
B4
B3
B2
B1
A
n.c.
OE
GND
1
2
3
4
5
6
7
8
002aab818
16 V
CC
15 B5
14 B6
13 B7
12 B8
11 S0
10 S1
9
S2
B4
B3
B2
B1
A
n.c.
OE
GND
1
2
3
4
5
6
7
8
002aab819
16 V
CC
15 B5
14 B6
13 B7
12 B8
11 S0
10 S1
9
S2
CBT3251DS
CBT3251PW
Fig 4. Pin configuration for SSOP16
(QSOP)
Fig 5. Pin configuration for TSSOP16
5.2 Pin description
Table 2:
Symbol
Pin description
Pin
Description
B outputs
[1]
A input
not connected
output enable (active LOW)
ground (0 V)
positive supply voltage
B1, B2, B3, B4, 1, 2, 3, 4,
B5, B6, B7, B8 12, 13, 14, 15
A
n.c.
OE
GND
V
CC
[1]
5
6
7
8
16
B outputs are inputs if A inputs are outputs.
CBT3251_1
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 21 December 2005
3 of 16
Philips Semiconductors
CBT3251
1-of-8 FET multiplexer/demultiplexer
6. Functional description
Refer to
Figure 1 “Logic diagram of CBT3251 (positive logic)”.
6.1 Function selection
Table 3:
Function selection
H = HIGH state; L = LOW state; 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 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
Function
7. Limiting values
Table 4:
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
V
CC
V
I
I
CCC
I
IK
T
stg
[1]
Parameter
supply voltage
input voltage
continuous current through
each V
CC
or GND pin
input clamping current
storage temperature
Conditions
Min
−0.5
[1]
−0.5
[1]
-
Max
+7.0
+7.0
128
−50
+150
Unit
V
V
mA
mA
°C
V
I
< 0 V
-
−65
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:
Symbol
V
CC
V
IH
V
IL
T
amb
[1]
Operating conditions
Parameter
supply voltage
HIGH-state input voltage
LOW-state input voltage
ambient temperature
operating in free air
Conditions
Min
4.5
2.0
-
−40
Typ
-
-
-
-
Max
5.5
-
0.8
+85
Unit
V
V
V
°C
All unused control inputs of the device must be held at V
CC
or GND to ensure proper device operation.
CBT3251_1
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 21 December 2005
4 of 16
Philips Semiconductors
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
LI
I
CC
∆I
CC
Parameter
input clamping voltage
pass voltage
input leakage current
quiescent supply current
additional quiescent supply
current
input capacitance
off-state input/output
capacitance
ON-state resistance
Conditions
V
CC
= 4.5 V; I
I
=
−18
mA
V
I
= V
CC
= 5.5 V; I
O
=
−100
mA
V
CC
= 5.5 V; V
I
= GND or 5.5 V
V
CC
= 5.5 V; I
O
= 0 mA;
V
I
= GND or 5.5 V
control inputs; 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
I
= 3 V or 0 V; OE = V
CC
B port; V
I
= 3 V or 0 V; OE = V
CC
V
CC
= 4 V; typ. at 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
CC
= 4.5 V; V
I
= 0 V; I
I
= 30 mA
V
CC
= 4.5 V; V
I
= 2.4 V; I
I
= 15 mA
[1]
[2]
[3]
All typical values are 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 A and the B terminals at the indicated current through the switch. ON-state resistance is
determined by the lowest voltage of the two (A or B) terminals.
[3]
[2]
Min
-
3.4
-
-
-
Typ
[1]
-
3.6
-
-
-
Max
−1.2
3.9
±1
3
2.5
Unit
V
V
µA
µA
mA
C
i
C
io(off)
R
on
-
-
-
-
-
-
-
3.5
17.5
4.0
14
5
5
10
-
-
-
20
7
7
15
pF
pF
pF
Ω
Ω
Ω
Ω
[3]
[3]
[3]
10. Dynamic characteristics
Table 7:
Dynamic characteristics
V
CC
= +5.0 V
±
0.5 V; T
amb
=
−
40
°
C to +85
°
C; unless otherwise specified.
Symbol
t
PD
t
en
t
dis
Parameter
propagation delay
enable time
[2]
disable time
[3]
Conditions
from input (A or Bn) to output (Bn or A)
from input (Sn) to output (A)
from input (Sn) to output (Bn)
from input (OE) to output (A or Bn)
from input (Sn) to output (Bn)
from input (OE) to output (A or Bn)
[1]
[2]
[3]
[1]
Min
-
2
1.5
1.6
1.9
2.3
Typ
-
-
-
-
-
-
Max
0.25
5.5
5.6
5.8
6.4
6.2
Unit
ns
ns
ns
ns
ns
ns
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).
Output enable time to HIGH and LOW level.
Output disable time from HIGH and LOW level.
CBT3251_1
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 21 December 2005
5 of 16
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