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INTEGRATED CIRCUITS
CBT3245
Octal bus switch with output enable
Preliminary specification
1998 Dec 08
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Philips Semiconductors Preliminary specification
CBT3245Octal bus switch with output enable
FEATURES
•Functionally equivalent to QS3245
•Standard ’245-type pinout
•5Ω 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 CBT3245 provides eight bits of high-speed TTL-compatible bus
switching in a standard ’245 device pinout. The low on-state
resistance of the switch allows connections to be made with minimal
propagation delay.
The CBT3245 device is organized as one 8-bit switch. When enable
(OE
) is low, the switch is on and port A is connected to port B.
When OE
exists between the two ports.
is high, the switch is open and a high-impedance state
The CBT3245 is characterized for operation from –40°C to 85°C.
QUICK REFERENCE DATA
SYMBOL PARAMETER
t
PLH
t
PHL
C
IO(OFF)
I
CCZ
Propagation delay
An to Yn
Pin capacitance (OFF state) VO = 3V or 0V 6 pF
Total supply current Outputs disabled; VCC =5.5V µA
CL = 50pF; VCC = 5V ns
CONDITIONS
T
= 25°C; GND = 0V
amb
TYPICAL UNIT
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER
20-Pin plastic SO –40°C to 85°C CBT3245 D CBT3245 D SOT163-1
20-Pin Plastic SSOP Type II –40°C to 85°C CBT3245 DB CBT3245 DB SOT339-1
20-Pin Plastic TSSOP Type I –40°C to 85°C CBT3245 PW CBT3245PW DH SOT360-1
PIN CONFIGURATION
1
NC
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8 B7
10 11
GND
20
V
OE
19
B1
18
B2
17
B3
16
B4
15
B5
14
B6
13
12
B8
SA00507
CC
PIN DESCRIPTION
PIN NUMBER SYMBOL NAME AND FUNCTION
1 NC No internal connection
19 OE Output enable input
2, 3, 4, 5, 6, 7, 8, 9 A1–A8
18, 17, 16, 15, 14,
13, 12, 11
10 GND Ground (0V)
20 V
B1–B8
CC
Positive supply voltage
1998 Dec 08
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Philips Semiconductors Preliminary specification
SYMBOL
PARAMETER
UNIT
CBT3245Octal bus switch with output enable
LOGIC SYMBOL
FUNCTION TABLE
INPUT INPUTS/OUTPUTS
A1
2
18
B1
OE A, B
L A = B
A8
9
11
B8
H = High voltage level
H Z
L = Low voltage level
Z = High impedance “off” state
19
OE
SA00508
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
CC
I
IK
V
I
I
OK
V
OUT
I
OUT
T
stg
DC supply voltage –0.5 to +7.0 V
DC input diode current V
DC input voltage
DC output diode current VO < 0 –50 mA
DC output voltage
DC output current output in Low state 128 mA
Storage temperature range –65 to 150 °C
PARAMETER CONDITIONS RATING UNIT
3
3
1, 2
< 0 –50 mA
I
–0.5 to +7.0 V
output in Off or High state –0.5 to +7 V
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 ju nction
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.
RECOMMENDED OPERATING CONDITIONS
V
CC
V
V
T
amb
1998 Dec 08
DC supply voltage 4.0 5.5 V
High-level input voltage 2.0 V
IH
Low-level Input voltage 0.8 V
IL
Operating free-air temperature range –40 +85 °C
LIMITS
Min Max
3
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Philips Semiconductors Preliminary specification
3
CBT3245Octal bus switch with output enable
DC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL PARAMETER TEST CONDITIONS T
V
I
∆I
C
IO(OFF)
I
CC
C
Input clamp voltage VCC = 4.5V; II = –18mA –1.2 V
IK
Input leakage current VCC = 5.5V; VI = GND or 5.5V ±5 µA
I
Quiescent supply current
Additional supply current per
CC
input pin
Control pins VI= 3V or 0, OE = V
I
2
2
VCC = 5.5V; IO = 0, VI = VCC or GND 50 µA
VCC = 5.5V , one input at 3.4V, other inputs at
V
or GND
CC
CC
Power-off leakage current VO = 3V or 0 6 pF
VCC = 4.5V; V1 = 0V; II = 64mA 5 7
r
on
On-resistance VCC = 4.5V; V1 = 0V; II = 30mA 5 7 Ω
VCC = 4.5V; V1 = 2.4V; II = 15mA 10 15
NOTES:
1. All typical values are at V
2. This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
= 5V, TA = 25 C
CC
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.
= –40°C to +85°C UNIT
amb
Min Typ
1
3 pF
or GND
CC
Max
3.5 mA
AC CHARACTERISTICS
GND = 0V; tR; CL = 50pF
74CBT3245
SYMBOL PARAMETER
t
pd
t
en
t
dis
Propagation delay
Output enable time
to High and Low level
Output disable time
from High and Low level
1
FROM
(INPUT)
A or B B or A .25 ns
OE A or B ns
OE A or B 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).
TO
(OUTPUT)
T
= –40°C to +85°C
amb
VCC = +5.0V ±0.5V
Min Max
UNIT
1998 Dec 08
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Philips Semiconductors Preliminary specification
CBT3245Octal bus switch with output enable
AC WAVEFORMS
VM = 1.5V, VIN = GND to 3.0V
INPUT
OUTPUT
1.5V
t
PLH
1.5V 1.5V
Waveform 1. Input to Output Propagation Delays
TEST CIRCUIT AND WAVEFORMS
1.5V
3 V
Output Control
(Low-level
0 V
t
PHL
V
OH
V
OL
SA00028
enabling
Output
Waveform 1
S1 at 7 V
(see Note)
Output
Waveform 2
S1 at Open
(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.
1.5 V 1.5 V
t
PZL
1.5 V
t
PZH
1.5 V
t
t
PHZ
PLZ
V
OL
V
OH
Waveform 2. 3-State Output Enable and Disable Times
+ 0.3V
– 0.3V
SA00029
3V
0V
3.5V
V
OL
V
OH
0V
From Output
Under Test
C
= 50 pF
L
DEFINITIONS
= Load capacitance includes jig and probe capacitance;
C
L
see AC CHARACTERISTICS for value.
500 Ω
500 Ω
Load Circuit
TEST S1
t
pd
t
PLZ/tPZL
t
PHZ/tPZH
open
7 V
open
7 V
S1
Open
GND
SA00012
NOTES:
1. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z
2. The outputs are measured one at a time with one transition per measurement.
= 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
O
1998 Dec 08
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Philips Semiconductors Preliminary specification
CBT3245Octal bus switch with output enable
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
1998 Dec 08
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Philips Semiconductors Preliminary specification
CBT3245Octal bus switch with output enable
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1
1998 Dec 08
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Philips Semiconductors Preliminary specification
CBT3245Octal bus switch with output enable
TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mm SOT360-1
1998 Dec 08
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Philips Semiconductors Preliminary specification
CBT3245Octal bus switch with output enable
NOTES
1998 Dec 08
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Philips Semiconductors Preliminary specification
CBT3245Octal bus switch with output enable
Data sheet status
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
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.
[1]
[1] Please consult the most recently issued datasheet before initiating or completing a design.
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 94088–3409
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: 9397-750-04607
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