CBT3244A
Octal bus switch with quad output enables
Rev. 3 — 8 September 2017
Product data sheet
1
General description
The CBT3244A provides eight bits of high-speed TTL-compatible bus switching in
a standard '244 device pinout. The low ON-state resistance of the switch allows
connections to be made with minimal propagation delay.
The CBT3244A device is organized as two 4-bit low-impedance switches with separate
output-enable (OE) inputs. When OE is LOW, the switch is on and data can flow from
port A to port B, or vice versa. When OE is HIGH, the switch is open and high-impedance
state exists between the two ports.
The CBT3244A is characterized for operation from -40 °C to +85 °C.
2
Features and benefits
•
•
•
•
•
Standard '244-type pinout
5 Ω switch connection between two ports
TTL compatible control input levels
Latch-up protection exceeds 500 mA per JESD78
ESD protection:
–
HBM JESD22-A114 exceeds 2000 V
–
MM JESD22-A115 exceeds 200 V
–
CDM JESD22-C101 exceeds 1000 V
3
Ordering information
Package
Temperature
range
Name
Description
Version
SOT764-1
Table 1. Ordering information
Type number
CBT3244ABQ
-40 °C to + 85 °C
DHVQFN20 plastic dual in-line compatible thermal enhanced
very thin quad flat package; no leads; 20 terminals;
body 2.5 × 4.5 × 0.85 mm
TSSOP20
SSOP20
SO20
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
plastic shrink small outline package; 20 leads;
body width 5.3 mm
plastic small outline package; 20 leads;
body width 7.5 mm
CBT3244APW
CBT3244ADB
CBT3244AD
-40 °C to + 85 °C
-40 °C to + 85 °C
-40 °C to + 85 °C
SOT360-1
SOT339-1
SOT163-1
Nexperia
Octal bus switch with quad output enables
CBT3244A
4
Marking
Marking code
CT3244A
CT3244A
CT3244A
CBT3244AD
Table 2. Marking codes
Type number
CBT3244ABQ
CBT3244APW
CBT3244ADB
CBT3244AD
5
Functional diagram
CBT3244A
1A1
1A4
1OE
2A1
2A4
2OE
2B1
2B4
1B1
1B4
002aab655
Figure 1. Logic diagram
CBT3244A
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2017. All rights reserved.
Product data sheet
Rev. 3 — 8 September 2017
2 / 16
Nexperia
Octal bus switch with quad output enables
CBT3244A
6
Pinning information
6.1 Pinning
1OE
1A1
2B4
1A2
2B3
1A3
2B2
1A4
2B1
1
2
3
4
5
6
7
8
9
20 V
CC
19 2OE
18 1B1
17 2A4
16 1B2
15 2A3
14 1B3
13 2A2
12 1B4
11 2A1
002aab651
1OE
1A1
2B4
1A2
2B3
1A3
2B2
1A4
2B1
1
2
3
4
5
6
7
8
9
20 V
CC
19 2OE
18 1B1
17 2A4
16 1B2
15 2A3
14 1B3
13 2A2
12 1B4
11 2A1
002aab654
CBT3244APW
CBT3244AD
GND 10
GND 10
Figure 2. Pin configuration for TSSOP20
Figure 3. Pin configuration for SO20
CBT3244ABQ
1OE
2
3
4
5
6
7
8
9
GND 10
2A1 11
GND
(1)
1
terminal 1
index area
1A1
2B4
1A2
2B3
1A3
20 V
CC
19 2OE
18 1B1
17 2A4
16 1B2
15 2A3
14 1B3
13 2A2
12 1B4
1OE
1A1
2B4
1A2
2B3
1A3
2B2
1A4
2B1
1
2
3
4
5
6
7
8
9
20 V
CC
19 2OE
18 1B1
17 2A4
16 1B2
15 2A3
14 1B3
13 2A2
12 1B4
11 2A1
002aab653
2B2
1A4
2B1
CBT3244ADB
002aab650
Transparent top view
GND 10
(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.
Figure 5. Pin configuration for DHVQFN20
Figure 4. Pin configuration for SSOP20
CBT3244A
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2017. All rights reserved.
Product data sheet
Rev. 3 — 8 September 2017
3 / 16
Nexperia
Octal bus switch with quad output enables
CBT3244A
6.2 Pin description
Table 3. Pin description
Symbol
1OE, 2OE
1A1, 1A2, 1A3, 1A4, 2A1, 2A2, 2A3, 2A4
1B1, 1B2, 1B3, 1B4, 2B1, 2B2, 2B3, 2B4
GND
V
CC
Pin
1, 19
2, 4, 6, 8, 11, 13, 15, 17
18, 16, 14, 12, 9, 7, 5, 3
10
20
Description
output enable (active LOW)
inputs
outputs
ground (0 V)
positive supply voltage
7
Functional description
[1]
Table 4. Function selection
Inputs
1OE
L
L
H
H
[1]
Outputs
2OE
L
H
L
H
1An, 1Bn
1An = 1Bn
1An = 1Bn
Z
Z
2An, 2Bn
2An = 2Bn
Z
2An = 2Bn
Z
H = HIGH voltage level; L = LOW voltage level; Z = high-impedance OFF state
8
Limiting values
Table 5. Limiting values
[1]
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
V
CC
V
I
V
O
I
IK
I
OK
I
O
T
stg
[1]
[2]
Conditions
[2]
Min
-0.5
-1.2
-0.5
-
-
-
-65
Max
+7.0
+7.0
+7.0
-18
-50
128
+150
Unit
V
V
V
mA
mA
mA
°C
supply voltage
input voltage
output voltage
input clamping current
output clamping current
output current
storage temperature
output in OFF or HIGH state
V
I
< 0 V
V
O
< 0 V
output in LOW state
[2]
The performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction temperatures which
are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150 °C.
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
CBT3244A
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2017. All rights reserved.
Product data sheet
Rev. 3 — 8 September 2017
4 / 16
Nexperia
Octal bus switch with quad output enables
CBT3244A
9
Recommended operating conditions
Table 6. Operating conditions
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
V
CC
T
amb
supply voltage
ambient temperature
Conditions
operating in free-air
Min
4.5
-40
Typ
-
-
Max
5.5
+85
Unit
V
°C
10 Static characteristics
Table 7. Static characteristics
T
amb
= -40 °C to +85 °C. Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
V
IK
V
IH
V
IL
I
I
I
CC
ΔI
CC
C
i
C
I/O
R
on
input clamping
voltage
HIGH-state input
voltage
LOW-state input
voltage
Conditions
V
CC
= 4.5 V; I
I
= -18 mA
Min
-
2.0
-
-
-
[2]
Typ
-
-
-
-
1
-
3
3
4
4
8
[1]
Max
-1.2
-
0.8
±1
3
2.5
-
-
7
7
15
Unit
V
V
V
μA
μA
mA
pF
pF
Ω
Ω
Ω
input leakage current V
CC
= 5.5 V; V
I
= V
CC
or GND
supply current
additional supply
current
input capacitance
input/output
capacitance
ON-state resistance
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; nOE = V
CC
nOE = V
CC
= 5.0 V
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
[3]
-
-
-
-
-
-
[1]
[2]
[3]
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 level 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.
CBT3244A
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2017. All rights reserved.
Product data sheet
Rev. 3 — 8 September 2017
5 / 16
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