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Philips
Semiconductors
CBT3244
Octal bus switch with Quad Output
Enables
Preliminary specification
1998 Dec 08
INTEGRATED CIRCUITS
Philips Semiconductors
Preliminary specification
CBT3244
Octal bus switch with Quad Output Enables
2
1998 Dec 08
FEATURES
Functionally equivalent to QS3244
Standard '244-type pinout
5
switch connection between two ports
TTL compatible control input levels
Package options include plastic small outline (D), shrink small
outline (DB), thin shrink small outline (TSSOP)
DESCRIPTION
The CBT3244 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 CBT3244 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 CBT3244 is characterized for operation from 40
C to 85
C.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
T
amb
= 25
C; GND = 0V
TYPICAL
UNIT
t
PLH
t
PHL
Propagation delay
An to Yn
C
L
= 50pF; V
CC
= 5V
ns
C
IO(OFF)
Pin capacitance (OFF state)
V
O
= 3V or 0V
6
pF
I
CCZ
Total supply current
Outputs disabled; V
CC
=5.5V
A
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
OUTSIDE NORTH AMERICA
NORTH AMERICA
DWG NUMBER
20-Pin plastic SO
40
C to 85
C
CBT3244 D
CBT3244 D
SOT163-1
20-Pin Plastic SSOP Type II
40
C to 85
C
CBT3244 DB
CBT3244 DB
SOT339-1
20-Pin Plastic TSSOP Type I
40
C to 85
C
CBT3244 PW
CBT3244PW DH
SOT360-1
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1OE
1A1
2B4
1A2
2B3
1A3
2B2
1A4
2B1
1B4
GND
2A2
1B3
2A3
1B2
2A4
1B1
2OE
VCC
2A1
SA00501
PIN DESCRIPTION
PIN NUMBER
SYMBOL
NAME AND FUNCTION
1, 19
1OE, 2OE
Output enable
2, 4, 6, 8
1A11A4
11, 13, 15, 17
2A12A4
18, 16, 14, 12
1B11B4
9, 7, 5, 3
2B12B4
10
GND
Ground (0V)
20
V
CC
Positive supply voltage
Philips Semiconductors
Preliminary specification
CBT3244
Octal bus switch with Quad Output Enables
1998 Dec 08
3
LOGIC SYMBOL
1A1
1A4
2A1
2A4
1B1
1B4
2B1
2B4
2
8
18
12
11
17
9
3
SA00503
19
1
2OE
1OE
FUNCTION TABLE
INPUTS
OUTPUTS
1OE
2OE
1A, 1B
2A, 2B
L
L
1A = 1B
2A = 2B
L
H
1A = 1B
Z
H
L
Z
2A = 2B
H
H
Z
Z
H = High voltage level
L
= Low voltage level
Z = High impedance "off " state
ABSOLUTE MAXIMUM RATINGS
1, 2
SYMBOL
PARAMETER
CONDITIONS
RATING
UNIT
V
CC
DC supply voltage
0.5 to +7.0
V
I
IK
DC input diode current
V
I
< 0
18
mA
V
I
DC input voltage
3
1.2 to +7.0
V
I
OK
DC output diode current
V
O
< 0
50
mA
V
OUT
DC output voltage
3
output in Off or High state
0.5 to +7
V
I
OUT
DC output current
output in Low state
128
mA
T
stg
Storage temperature range
65 to 150
C
NOTES:
1. 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 "recommended operating conditions" is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
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.
3. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
Philips Semiconductors
Preliminary specification
CBT3244
Octal bus switch with Quad Output Enables
1998 Dec 08
4
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
Min
Max
UNIT
V
CC
DC supply voltage
4.5
5.5
V
V
IH
High-level input voltage
2.0
V
V
IL
Low-level Input voltage
0.8
V
T
amb
Operating free-air temperature range
40
+85
C
DC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
T
amb
= 40
C to +85
C
UNIT
Min
Typ
1
Max
V
IK
Input clamp voltage
V
CC
= 4.5V; I
I
= 18mA
1.2
V
I
I
Input leakage current
V
CC
= 5.5V; V
I
= GND or 5.5V
5
A
I
CC
Quiescent supply current
2
V
CC
= 5.5V; I
O
= 0, V
I
= V
CC
or GND
50
A
I
CC
Additional supply current per
input pin
2
V
CC
= 5.5V, one input at 3.4V, other inputs at
V
CC
or GND
3.5
mA
C
I
Control pins
V
I
= 3V or 0, OE = V
CC
3
pF
C
IO(OFF)
Power-off leakage current
V
O
= 3V or 0
6
pF
3
V
CC
= 4.5V; V
1
= 0V; I
I
= 64mA
5
7
r
on
3
On-resistance
V
CC
= 4.5V; V
1
= 0V; I
I
= 30mA
5
7
V
CC
= 4.5V; V
1
= 0V; I
I
= 15mA
10
15
NOTES:
1. All typical values are at V
CC
= 5V, TA = 25 C
2. This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
CC
or GND
3. 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.
AC CHARACTERISTICS
GND = 0V; t
R;
C
L
= 50pF
74CBT3244
SYMBOL
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
T
amb
= 40
C to +85
V
CC
= +5.0V
0.5V
UNIT
Min
Max
t
pd
Propagation delay
1
A or B
B or A
.25
ns
t
en
Output enable time
to High and Low level
OE
A or B
1.0
8.9
ns
t
dis
Output disable time
from High and Low level
OE
A or B
1.0
7.4
ns
NOTES:
1. This parameter is warranted but not production tested. The propagation delay is based on the RC time constant of the typical on-state
resistance of the switch and a load capacitance of 50 pF, when driven by an ideal voltage source (zero output impedance).
Philips Semiconductors
Preliminary specification
CBT3244
Octal bus switch with Quad Output Enables
1998 Dec 08
5
AC WAVEFORMS
V
M
= 1.5V, V
IN
= GND to 3.0V
INPUT
1.5V
OUTPUT
t
PLH
t
PHL
SA00028
1.5V
1.5V
1.5V
3 V
0 V
V
OH
V
OL
Waveform 1. Input to Output Propagation Delays
Output Control
(Low-level
enabling
1.5 V
t
PZH
t
PHZ
V
OH
V
OL
t
PZL
t
PLZ
3.5V
0V
V
OL
+ 0.3V
V
OH
0.3V
SA00029
1.5 V
1.5 V
1.5 V
0V
3V
Output
Waveform 1
S1 at 7 V
(see Note)
Note:
Waveform 1 is for an output with internal conditions such that
the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that
the output is high except when disabled by the output control.
Output
Waveform 2
S1 at Open
(see Note)
Waveform 2. 3-State Output Enable and Disable Times
TEST CIRCUIT AND WAVEFORMS
C
L
= 50 pF
500
Load Circuit
DEFINITIONS
C
L
=
Load capacitance includes jig and probe capacitance;
see AC CHARACTERISTICS for value.
TEST
S1
t
pd
open
t
PLZ
/t
PZL
7 V
t
PHZ
/t
PZH
open
SA00012
500
From Output
Under Test
S1
7 V
Open
GND
NOTES:
1. All input pulses are supplied by generators having the following characteristics: PRR
10MHz, Z
O
= 50
, t
r
2.5 ns, t
f
2.5 ns.
2. The outputs are measured one at a time with one transition per measurement.
Philips Semiconductors
Preliminary specification
CBT3244
Octal bus switch with Quad Output Enables
1998 Dec 08
6
SO20:
plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
Philips Semiconductors
Preliminary specification
CBT3244
Octal bus switch with Quad Output Enables
1998 Dec 08
7
SSOP20:
plastic shrink small outline package; 20 leads; body width 5.3 mm
SOT339-1
Philips Semiconductors
Preliminary specification
CBT3244
Octal bus switch with Quad Output Enables
1998 Dec 08
8
TSSOP20:
plastic thin shrink small outline package; 20 leads; body width 4.4 mm
SOT360-1
Philips Semiconductors
Preliminary specification
CBT3244
Octal bus switch with Quad Output Enables
1998 Dec 08
9
NOTES
Philips Semiconductors
Preliminary specification
CBT3244
Octal bus switch with Quad Output Enables
yyyy mmm dd
10
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one
or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.
Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 940883409
Telephone 800-234-7381
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
print code
Date of release: 05-96
Document order number:
Philips
Semiconductors
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
[1]
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
Data sheet status
[1]
Please consult the most recently issued datasheet before initiating or completing a design.
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