CBT3245A
Octal bus switch
Rev. 3 — 5 January 2012
Product data sheet
1. General description
The CBT3245A provides eight bits of high-speed TTL-compatible bus switching. The low
ON resistance of the switch allows connections to be made with minimal propagation
delay.
The CBT3245A is organized as one 8-bit bus switches with one output enable (OE) input.
When OE is LOW, the switch is on and port A is connected to the B port. When OE is
HIGH, each switch is disabled. The CBT3245A is characterized for operation from
40 C
to +85
C.
2. Features and benefits
5
switch connection between two ports
TTL-compatible control input levels
Multiple package options
Latch-up protection exceeds 500 mA per JESD78
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115B exceeds 150 V
CDM JESD22-C101C exceeds 1000 V
3. Ordering information
Table 1.
Ordering information
Package
Temperature
range
CBT3245AD
CBT3245ADB
CBT3245ADS
CBT3245APW
CBT3245ABQ
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
Name
SO20
SSOP20
SSOP20
[1]
TSSOP20
DHVQFN20
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic shrink small outline package; 20 leads;
body width 5.3 mm
plastic shrink small outline package; 20 leads; body
width 3.9 mm; lead pitch 0.635 mm
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
plastic dual-in-line compatible thermal enhanced very
thin quad flat package; no leads; 20 terminals; body
2.5
4.5
0.85 mm
Version
SOT163-1
SOT339-1
SOT724-1
SOT360-1
SOT764-1
Type number
[1]
Also known as QSOP20 package
NXP Semiconductors
CBT3245A
Octal bus switch
4. Functional diagram
2
18
A1
B1
9
A8
OE
19
11
B8
001aao117
Fig 1.
Logic diagram
5. Pinning information
5.1 Pinning
CBT3245A
CBT3245A
n.c.
A1
A2
A3
A4
A5
A6
A7
A8
1
2
3
4
5
6
7
8
9
20 V
CC
19 OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
aaa-001831
n.c.
A1
A2
A3
A4
A5
A6
A7
A8
1
2
3
4
5
6
7
8
9
20 V
CC
19 OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
GND 10
GND 10
aaa-001832
Fig 2.
Pin configuration for SOT163-1 (SO20),
SOT339-1 (SSOP20) and SOT360-1 (TSSOP20)
Fig 3.
Pin configuration for SOT724-1 (SSOP20)
CBT3245A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 3 — 5 January 2012
2 of 16
NXP Semiconductors
CBT3245A
Octal bus switch
CBT3245A
terminal 1
index area
A1
A2
A3
A4
A5
A6
A7
A8
2
3
4
5
6
7
8
9
GND 10
B8 11
GND
(1)
20 V
CC
19 OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
n.c.
1
aaa-001833
Transparent top view
(1) This is not a supply pin. The substrate is attached to this pad using conductive die attach material. There is no electrical or
mechanical requirement to solder this pad. However, if it is soldered, the solder land should remain floating or be connected to
GND.
Fig 4.
Pin configuration for SOT764-1 (DHVQFN20)
5.2 Pin description
Table 2.
Symbol
n.c.
A1 to A8
GND
B1 to B8
OE
V
CC
Pin description
Pin
1
2, 3, 4, 5, 6, 7, 8, 9
10
18, 17, 16, 15, 14, 13, 12, 11
19
20
Description
not connected
data input/output (A port)
ground (0 V)
data input/output (B port)
output enable input (active LOW)
positive supply voltage
6. Functional description
Table 3.
Input
OE
L
H
[1]
Function selection
[1]
Input/output
An, Bn
An = Bn
Z
H = HIGH voltage level; L = LOW voltage level; Z = high-impedance OFF-state.
CBT3245A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 3 — 5 January 2012
3 of 16
NXP Semiconductors
CBT3245A
Octal bus switch
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
[1]
T
amb
=
40
C to +85
C, unless otherwise specified.
Symbol
V
CC
V
I
I
OK
V
O
I
O
I
IK
T
stg
[1]
Parameter
supply voltage
input voltage
output clamping current
output voltage
output current
input clamping current
storage temperature
Conditions
[2]
Min
0.5
0.5
50
[2]
Max
+7.0
+7.0
-
+7.0
128
-
+150
Unit
V
V
mA
V
mA
mA
C
V
O
< 0 V
V
O
< 0 V
V
I
= 0 V
0.5
-
50
65
Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under
Section 8.
is not implied. Exposure to absolute-maximum-rated
conditions for extended periods may affect device reliability.
The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
[2]
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
4.0
2.0
-
40
Typ
-
-
-
-
Max
5.5
-
0.8
+85
Unit
V
V
V
C
9. Static characteristics
Table 6.
Static characteristics
Voltages are referenced to GND (ground = 0 V).
Symbol
V
IK
I
I
I
CC
I
CC
C
I
C
io(off)
Parameter
input clamping voltage
input leakage current
supply current
additional supply current
input capacitance
off-state input/output
capacitance
Conditions
V
CC
= 4.5 V; I
I
=
18
mA
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 pin; 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
port off; V
I
= 3 V or 0 V; OE = V
CC
[2]
T
amb
=
40 C
to +85
C
Min
-
-
-
-
-
-
Typ
[1]
-
-
1
-
3.2
6.6
Max
1.2
5
3
3.5
-
-
Unit
V
A
A
mA
pF
pF
CBT3245A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 3 — 5 January 2012
4 of 16
NXP Semiconductors
CBT3245A
Octal bus switch
Table 6.
Static characteristics
…continued
Voltages are referenced to GND (ground = 0 V).
Symbol
R
ON
Parameter
ON resistance
Conditions
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 An and the Bn terminals at the indicated current through the switch. ON resistance is
determined by the lowest voltage of the two (An or Bn) terminals.
[3]
[3]
[3]
T
amb
=
40 C
to +85
C
Min
-
-
-
Typ
[1]
5
5
10
Max
7
7
15
Unit
10. Dynamic characteristics
Table 7.
Dynamic characteristics
Voltages are referenced to GND (ground = 0 V). For test circuit see
Figure 7.
Symbol
t
pd
t
en
t
dis
Parameter
propagation delay
enable time
disable time
Conditions
An, Bn to Bn, An; see
Figure 5
V
CC
= 5.0 V
0.5 V
OE to An or Bn; see
Figure 6
V
CC
= 5.0 V
0.5 V
OE to An or Bn; see
Figure 6
V
CC
= 5.0 V
0.5 V
[1]
[2]
[2]
[2]
[1][2]
T
amb
=
40 C
to +85
C
Unit
Min
-
1.0
1.0
Max
0.25
5.9
6.0
ns
ns
ns
The propagation delay is the calculated RC time constant of the typical ON resistance of the switch and the specified load capacitance,
when driven by an ideal voltage source (zero output impedance).
t
pd
is the same as t
PLH
and t
PHL
.
t
en
is the same as t
PZL
and t
PZH
.
t
dis
is the same as t
PLZ
and t
PHZ
.
CBT3245A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 3 — 5 January 2012
5 of 16
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