Philips
Semiconductors
1999 Oct 28
CBT6800
10-bit bus switch with precharged outputs
for live insertion
INTEGRATED CIRCUITS
Product specification
Supersedes data of 1999 Mar 18
Philips Semiconductors
Product specification
CBT6800
10-bit bus switch with precharged outputs
for live insertion
2
1999 Oct 28
8532182 22598
FEATURES
5
switch connection between two ports
TTL compatible input and output levels
Outputs are precharged by bias voltage to minimize signal
distortion during live insertion
Latch-up protection exceeds 100 mA per JESD78
ESD protection exceeds 2000 V HBM per JESD22-A114,
200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
DESCRIPTION
The CBT6800 provides ten bits of high-speed TTL-compatible bus
switching. The low on-state resistance of the switch allows
bi-directional connections to be made while adding near-zero
propagation delay. The device also precharges the B port to a
user-selectable bias voltage (BIASV) to minimize live-insertion noise.
The CBT6800 is organized as one 10-bit switch with a single enable
(ON) input. When ON is low, the switch is on and port A is
connected to port B. When ON is high, the switch between port A
and port B is open and the B port is precharged to BIASV through
the equivalent of a 10 k
resistor.
The CBT6800 is characterized for operation from 40
C to 85
C.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
T
amb
= 25
C; GND = 0 V
TYPICAL
UNIT
t
PLH
t
PHL
Propagation delay
An to Bn or Bn to An
C
L
= 50 pF; V
CC
= 5 V
250
ps
C
IN
Input capacitance control pin
V
I
= 0 V or V
CC
3.5
pF
C
OUT
Output capacitance I/O pins
Outputs disabled; V
O
= 0 V or V
CC
8.2
pF
I
CCZ
Total supply current
Outputs disabled; V
CC
=5.5 V
1
A
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
ORDER CODE
DWG NUMBER
24-Pin Plastic TSSOP Type I
40
C to +85
C
CBT6800 PW DH
SOT3551
PIN CONFIGURATION
SA00505
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
GND
OE
Vcc
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
BIASV
PIN DESCRIPTION
PIN NUMBER
SYMBOL
NAME AND FUNCTION
1
OE
Output enable
13
BIASV
Precharge bias voltage input
2, 3, 4, 5, 6,
7, 8, 9, 10, 11
A1A10
A-port I/O pins
23, 22, 21, 20, 19,
18, 17, 16, 15, 14
B1B10
B-port I/O pins with active pullup
12
GND
Ground (V)
24
V
CC
Positive supply voltage
Philips Semiconductors
Product specification
CBT6800
10-bit bus switch with precharged outputs
for live insertion
1999 Oct 28
3
LOGIC SYMBOL
BIASV
A1
A10
SA00536
B1
B10
OE
13
FUNCTION TABLE
OE
B1 B10
FUNCTION
L
A1 A10
Connect
H
BIASV
Precharge
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
50
mA
V
I
DC input voltage
3
1.2 to +7.0
V
I
SW
DC clamp diode current
V
O
< 0
50
mA
T
stg
Storage temperature range
65 to 150
C
BiasV
DC voltage range
0.5 to 6.0
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 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.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
Min
Max
UNIT
V
CC
DC supply voltage
4.5
5.5
V
BIASV
DC supply voltage
1.3
V
CC
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
Philips Semiconductors
Product specification
CBT6800
10-bit bus switch with precharged outputs
for live insertion
1999 Oct 28
4
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
= 4.5 V; I
I
= 18 mA
1.2
V
I
I
Input leakage current OE
V
CC
= 5.5 V; V
I
= GND or 5.5 V
5
A
I
O
Output bias current
V
CC
= 4.5 V; BiasV = 2.4 V; V
O
= 0
0.25
mA
I
CC
Quiescent supply current
V
CC
= 5.5 V; I
O
= 0, V
I
= V
CC
or GND
50
A
I
CC
Control pins
2
V
CC
= 5.5 V, one input at 3.4 V, other inputs at V
CC
or GND
2.5
mA
C
I
Control pins
V
I
= 3 V or 0
3.5
pF
C
O(OFF)
Off-state capacitance I/O pins
V
O
= 3 V or 0; switch off
8.2
pF
3
V
CC
= 4.5 V; V
I
= 0 V; I
I
= 64 mA
5
7
r
on
3
On-resistance
V
CC
= 4.5 V; V
I
= 0 V; I
I
= 30 mA
5
7
V
CC
= 4.5 V; V
I
= 2.4 V; I
I
= 15 mA
10
15
VP
Pass gate voltage
V
IN
= V
CC
= 5.0 V, I
OUT
= 100
A
3.4
3.6
3.9
V
NOTES:
1. All typical values are at V
CC
= 5 V, T
amb
= 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. Onstate resistance is
determined by the lowest voltage of the two (A or B) terminals.
Philips Semiconductors
Product specification
CBT6800
10-bit bus switch with precharged outputs
for live insertion
1999 Oct 28
5
AC CHARACTERISTICS
GND = 0 V; C
L
= 50 pF; t
r
= t
f
2.5 ns
FROM
TO
LIMITS
SYMBOL
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= +5.0 V
0.5 V
UNIT
(INPUT)
(OUTPUT)
Min
Max
t
pd
Propagation delay
1
A or B
B or A
.25
ns
t
PZH
T
PZL
BIASV = GND
BIASV = 3 V
ON
A or B
2.4
3.0
7.7
8.3
ns
t
PHZ
T
PLZ
BIASV = GND
BIASV = 3 V
ON
A or B
1.0
3.1
5.3
7.8
ns
NOTE:
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).
AC WAVEFORMS
V
M
= 1.5 V, V
IN
= GND to 3.0 V
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. Waveforms Showing the Input (An) to Output (Yn)
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. Waveforms Showing the 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
10 MHz, 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
Product specification
CBT6800
10-bit bus switch with precharged outputs
for live insertion
1999 Oct 28
6
TSSOP24:
plastic thin shrink small outline package; 24 leads; body width 4.4 mm
SOT355-1
Philips Semiconductors
Product specification
CBT6800
10-bit bus switch with precharged outputs
for live insertion
1999 Oct 28
7
NOTES
Philips Semiconductors
Product specification
CBT6800
10-bit bus switch with precharged outputs
for live insertion
1999 Oct 28
8
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 1999
All rights reserved. Printed in U.S.A.
Date of release: 10-99
Document order number:
9397 750 06552
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 changes 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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