CBT3245A
Octal bus switch
Rev. 4 — 30 April 2019
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.
2. Features and benefits
•
•
•
•
•
5 Ω 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
Specified from -40 °C to +85 °C
•
3. Ordering information
Table 1. Ordering information
Type number
Package
Temperature range
CBT3245AD
CBT3245ADB
CBT3245APW
CBT3245ABQ
-40 °C to +85 °C
-40 °C to +85 °C
-40 °C to +85 °C
-40 °C to +85 °C
Name
SO20
SSOP20
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
Version
SOT163-1
SOT339-1
plastic thin shrink small outline package; 20 leads; SOT360-1
body width 4.4 mm
plastic dual-in-line compatible thermal enhanced
SOT764-1
very thin quad flat package; no leads; 20 terminals;
body 2.5 x 4.5 x 0.85 mm
Nexperia
CBT3245A
Octal bus switch
4. Functional diagram
A1
2
18
B1
A8
OE
9
19
11
B8
001aao117
Fig. 1.
Logic diagram
5. Pinning information
5.1. Pinning
CBT3245A
terminal 1
index area
A1
A2
A3
A4
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
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
A5
A6
A7
A8
aaa-001833
Transparent top view
GND 10
Fig. 2.
Pin configuration for SOT163-1 (SO20),
SOT339-1 (SSOP20) and SOT360-1 (TSSOP20)
(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. 3.
Pin configuration for SOT764-1 (DHVQFN20)
5.2. Pin description
Table 2. Pin description
Symbol
n.c.
A1 to A8
GND
B1 to B8
OE
V
CC
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
CBT3245A
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 4 — 30 April 2019
2 / 13
Nexperia
CBT3245A
Octal bus switch
6. Functional description
Table 3. Functional description
H = HIGH voltage level; L = LOW voltage level; Z = high-impedance OFF-state.
Input
OE
L
H
Input/output
An, Bn
An = Bn
Z
7. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
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
[1]
V
O
< 0 V
[1]
V
O
< 0 V
V
I
< 0 V
Min
-0.5
-0.5
-50
-0.5
-
-50
-65
Max
+7.0
+7.0
-
+7.0
±128
-
+150
Unit
V
V
mA
V
mA
mA
°C
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. Recommended 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
CBT3245A
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 4 — 30 April 2019
3 / 13
Nexperia
CBT3245A
Octal bus switch
9. Static characteristics
Table 6. Static characteristics
Voltages are referenced to GND (ground = 0 V).
Symbol
V
IK
I
I
I
CC
ΔI
CC
C
I
C
io(off)
R
ON
Parameter
input clamping 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
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
[2]
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
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]
T
amb
= -40 °C to +85 °C
Min
-
-
-
-
-
-
[3]
[3]
[3]
-
-
-
Typ[1]
-
-
1
-
3.2
6.6
5
5
10
Max
-1.2
±5
3
3.5
-
-
7
7
15
Unit
V
μA
μA
mA
pF
pF
Ω
Ω
Ω
All typical values are measured at V
CC
= 5 V and 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.
10. Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V). For test circuit see
Fig. 6.
Symbol
t
pd
t
en
t
dis
Parameter
propagation delay
enable time
disable time
Conditions
An, Bn to Bn, An; see
Fig. 4
V
CC
= 5.0 V ± 0.5 V
OE to An or Bn; see
Fig. 5
V
CC
= 5.0 V ± 0.5 V
OE to An or Bn; see
Fig. 5
V
CC
= 5.0 V ± 0.5 V
[1]
[2]
T
amb
= -40 °C to +85 °C
Min
[1][2]
-
[2]
1.0
[2]
1.0
6.0
5.9
0.25
Max
Unit
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.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 4 — 30 April 2019
4 / 13
Nexperia
CBT3245A
Octal bus switch
10.1. Waveforms and test circuit
V
I
An, Bn input
GND
t
PHL
V
OH
Bn, An output
V
OL
V
M
001aam475
V
M
t
PLH
Measurement points are given in
Table 8.
Logic levels: V
OL
and V
OH
are typical output voltage levels that occur with the output load.
Fig. 4.
The data input (An, Bn) to output (Bn, An) propagation delay times
V
I
OE input
GND
t
PLZ
output
LOW-to-OFF
OFF-to-LOW
3.5 V
V
M
V
OL
t
PHZ
output
HIGH-to-OFF
OFF-to-HIGH
V
OH
V
Y
V
M
GND
outputs
enabled
outputs
disabled
outputs
enabled
001aam476
V
M
t
PZL
V
X
t
PZH
Measurement points are given in
Table 8.
Logic levels: V
OL
and V
OH
are typical output voltage levels that occur with the output load.
Fig. 5.
Enable and disable times
Table 8. Measurement points
Supply voltage
Input
V
CC
V
I
V
M
1.5 V
V
CC
= 5.0 V ± 0.5 V GND to 3.0 V
Output
V
M
1.5 V
V
X
V
OL
+ 0.3 V
V
Y
V
OH
- 0.3 V
CBT3245A
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 4 — 30 April 2019
5 / 13
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