CBT3244A
Octal bus switch with quad output enables
Rev. 02 — 15 September 2005
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
s
s
s
s
Standard '244-type pinout
5
Ω
switch connection between two ports
TTL compatible control input levels
Package options include:
x
plastic small outline (SO20)
x
shrink small outline (SSOP20)
x
shrink small outline, QSOP (SSOP20)
x
thin shrink small outline (TSSOP20)
x
depopulated heatsink very thin quad flat package, no leads (DHVQFN20)
s
Latch-up protection exceeds 500 mA per JESD78
s
ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115 and 1000 V CDM per JESD22-C101
Philips Semiconductors
CBT3244A
Octal bus switch with quad output enables
3. Ordering information
Table 1:
Ordering information
T
amb
=
−
40
°
C to +85
°
C
Type number
Topside
mark
Package
Name
Description
Version
DHVQFN20 plastic dual in-line compatible thermal enhanced very thin quad flat SOT764-1
package; no leads; 20 terminals; body 2.5
×
4.5
×
0.85 mm
TSSOP20
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
SOT360-1
CBT3244ABQ CT3244A
CBT3244APW CT3244A
CBT3244ADS CT3244ADS SSOP20
[1]
CBT3244ADB CT3244A
CBT3244AD
[1]
plastic shrink small outline package; 20 leads; body width 3.9 mm; SOT724-1
lead pitch 0.635 mm
plastic shrink small outline package; 20 leads; body width 5.3 mm
plastic small outline package; 20 leads; body width 7.5 mm
SOT339-1
SOT163-1
SSOP20
CBT3244AD SO20
Also known as QSOP20.
Standard packing quantities and other packaging data are available at
www.standardics.philips.com/packaging.
4. Functional diagram
CBT3244A
1A1
1B1
1A4
1OE
2A1
1B4
2B1
2A4
2OE
2B4
002aab655
Fig 1. Logic diagram of CBT3244A
9397 750 13362
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 15 September 2005
2 of 18
Philips Semiconductors
CBT3244A
Octal bus switch with quad output enables
5. Pinning information
5.1 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
Fig 2. Pin configuration for TSSOP20
Fig 3. Pin configuration for SO20
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
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
CBT3244ADS
CBT3244ADB
GND 10
GND 10
002aab652
Fig 4. Pin configuration for SSOP20
(QSOP)
Fig 5. Pin configuration for SSOP20
9397 750 13362
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 15 September 2005
3 of 18
Philips Semiconductors
CBT3244A
Octal bus switch with quad output enables
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
2B2
1A4
2B1
20 V
CC
19 2OE
18 1B1
17 2A4
16 1B2
15 2A3
14 1B3
13 2A2
12 1B4
002aab650
Transparent top view
(1) The die substrate is attached to this pad using conductive die attach material. It cannot be
used as a supply pin or input.
Fig 6. Pin configuration for DHVQFN20
5.2 Pin description
Table 2:
Symbol
1OE
1A1, 1A2, 1A3, 1A4
2A1, 2A2, 2A3, 2A4
1B1, 1B2, 1B3, 1B4
2B1, 2B2, 2B3, 2B4
GND
2OE
V
CC
Pin description
Pin
1
2, 4, 6, 8
11, 13, 15, 17
18, 16, 14, 12
9, 7, 5, 3
10
19
20
Description
output enable (active LOW)
inputs
inputs
outputs
outputs
ground (0 V)
output enable (active LOW)
positive supply voltage
9397 750 13362
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 15 September 2005
4 of 18
Philips Semiconductors
CBT3244A
Octal bus switch with quad output enables
6. Functional description
Refer to
Figure 1 “Logic diagram of CBT3244A”.
6.1 Function table
Table 3:
Function selection
H = HIGH voltage level; L = LOW voltage level; Z = high-impedance OFF state
Inputs
1OE
L
L
H
H
2OE
L
H
L
H
Outputs
1An, 1Bn
1An = 1Bn
1An = 1Bn
Z
Z
2An, 2Bn
2An = 2Bn
Z
2An = 2Bn
Z
7. Limiting values
Table 4:
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
[1]
Symbol
V
CC
I
IK
V
I
I
OK
V
O
I
O
T
stg
[1]
Parameter
supply voltage
input clamping current
input voltage
output clamping current
output voltage
output current
storage temperature
Conditions
V
I
< 0 V
[2]
Min
−0.5
-
−1.2
-
[2]
Max
+7.0
−18
+7.0
−50
+7.0
128
+150
Unit
V
mA
V
mA
V
mA
°C
V
O
< 0 V
output in OFF or HIGH state
output in LOW state
−0.5
-
−65
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.
[2]
8. Recommended operating conditions
Table 5:
Symbol
V
CC
V
IH
V
IL
T
amb
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
9397 750 13362
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 15 September 2005
5 of 18
