INTEGRATED CIRCUITS
CBT6800
10-bit bus switch with precharged outputs
for live insertion
Product specification
Supersedes data of 1999 Mar 18
1999 Oct 28
Philips
Semiconductors
Philips Semiconductors
Product specification
10-bit bus switch with precharged outputs
for live insertion
CBT6800
FEATURES
•
5
Ω
switch connection between two ports
•
TTL compatible input and output levels
•
Outputs are precharged by bias voltage to minimize signal
distortion during live insertion
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 kΩ resistor.
The CBT6800 is characterized for operation from –40°C to 85°C.
•
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
QUICK REFERENCE DATA
SYMBOL
t
PLH
t
PHL
C
IN
C
OUT
I
CCZ
PARAMETER
Propagation delay
An to Bn or Bn to An
Input capacitance – control pin
Output capacitance – I/O pins
Total supply current
CONDITIONS
T
amb
= 25°C; GND = 0 V
C
L
= 50 pF; V
CC
= 5 V
V
I
= 0 V or V
CC
Outputs disabled; V
O
= 0 V or V
CC
Outputs disabled; V
CC
=5.5 V
TYPICAL
250
3.5
8.2
1
UNIT
ps
pF
pF
µA
ORDERING INFORMATION
PACKAGES
24-Pin Plastic TSSOP Type I
TEMPERATURE RANGE
–40°C to +85°C
ORDER CODE
CBT6800 PW DH
DWG NUMBER
SOT355–1
PIN CONFIGURATION
PIN DESCRIPTION
PIN NUMBER
1
13
SYMBOL
OE
BIASV
A1–A10
B1–B10
GND
V
CC
NAME AND FUNCTION
Output enable
Precharge bias voltage input
A-port I/O pins
B-port I/O pins – with active pullup
Ground (V)
Positive supply voltage
OE
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Vcc
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
BIASV
2, 3, 4, 5, 6,
7, 8, 9, 10, 11
23, 22, 21, 20, 19,
18, 17, 16, 15, 14
12
24
SA00505
1999 Oct 28
2
853–2182 22598
Philips Semiconductors
Product specification
10-bit bus switch with precharged outputs
for live insertion
CBT6800
LOGIC SYMBOL
13
BIASV
FUNCTION TABLE
OE
L
H
B1 – B10
A1 – A10
BIASV
FUNCTION
Connect
Precharge
A1
B1
H = High voltage level
L = Low voltage level
Z = High impedance “off ” state
A10
B10
OE
SA00536
ABSOLUTE MAXIMUM RATINGS
1, 2
SYMBOL
V
CC
I
IK
V
I
I
SW
T
stg
BiasV
PARAMETER
DC supply voltage
DC input diode current
DC input voltage
3
DC clamp diode current
Storage temperature range
DC voltage range
V
O
< 0
CONDITIONS
RATING
–0.5 to +7.0
–50
–1.2 to +7.0
–50
–65 to 150
–0.5 to 6.0
UNIT
V
mA
V
mA
°C
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
V
CC
BIASV
V
IH
V
IL
T
amb
DC supply voltage
DC supply voltage
High-level input voltage
Low-level Input voltage
Operating free-air temperature range
–40
PARAMETER
LIMITS
Min
4.5
1.3
2.0
0.8
+85
Max
5.5
V
CC
UNIT
V
V
V
V
°C
1999 Oct 28
3
Philips Semiconductors
Product specification
10-bit bus switch with precharged outputs
for live insertion
CBT6800
DC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
V
IK
I
I
I
O
I
CC
∆I
CC
C
I
C
O(OFF)
r
on3
VP
PARAMETER
Input clamp voltage
Input leakage current – OE
Output bias current
Quiescent supply current
Control pins
2
Control pins
Off-state capacitance – I/O pins
On-resistance
Pass gate voltage
TEST CONDITIONS
V
CC
= 4.5 V; I
I
= –18 mA
V
CC
= 5.5 V; V
I
= GND or 5.5 V
V
CC
= 4.5 V; BiasV = 2.4 V; V
O
= 0
V
CC
= 5.5 V; I
O
= 0, V
I
= V
CC
or GND
V
CC
= 5.5 V, one input at 3.4 V, other inputs at V
CC
or GND
V
I
= 3 V or 0
V
O
= 3 V or 0; switch off
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
V
IN
= V
CC
= 5.0 V, I
OUT
= –100
µA
3.4
3.5
8.2
5
5
10
3.6
7
7
15
3.9
V
Ω
0.25
50
2.5
T
amb
= –40°C to +85°C
Min
Typ
1
Max
–1.2
±5
V
µA
mA
µA
mA
pF
pF
UNIT
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. On–state resistance is
determined by the lowest voltage of the two (A or B) terminals.
1999 Oct 28
4
Philips Semiconductors
Product specification
10-bit bus switch with precharged outputs
for live insertion
CBT6800
AC CHARACTERISTICS
GND = 0 V; C
L
= 50 pF; t
r
= t
f
≤
2.5 ns
LIMITS
SYMBOL
t
pd
t
PZH
T
PZL
t
PHZ
T
PLZ
PARAMETER
Propagation delay
1
BIASV = GND
BIASV = 3 V
BIASV = GND
BIASV = 3 V
FROM
(INPUT)
A or B
ON
ON
TO
(OUTPUT)
B or A
A or B
A or B
2.4
3.0
1.0
3.1
V
CC
= +5.0 V
±0.5
V
Min
Max
.25
7.7
8.3
5.3
7.8
ns
ns
ns
UNIT
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
3V
1.5V
INPUT
0V
t
PLH
t
PHL
V
OH
1.5V
OUTPUT
V
OL
1.5V
1.5V
TEST CIRCUIT AND WAVEFORMS
7V
From Output
Under Test
C
L
= 50 pF
500
Ω
S1
Open
GND
500
Ω
Load Circuit
TEST
t
pd
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
open
7V
open
SA00028
Waveform 1. Waveforms Showing the Input (An) to Output (Yn)
Propagation Delays
3V
Output Control
(Low-level
enabling
t
PZL
Output
Waveform 1
S1 at 7 V
(see Note)
t
PZH
Output
Waveform 2
S1 at Open
(see Note)
DEFINITIONS
Load capacitance includes jig and probe capacitance;
C
L
=
see AC CHARACTERISTICS for value.
SA00012
1.5 V
1.5 V
0V
3.5V
1.5 V
t
PHZ
V
OH
– 0.3V
1.5 V
0V
t
PLZ
NOTES:
1. All input pulses are supplied by generators having the following
characteristics: PRR
≤
10 MHz, Z
O
= 50
Ω,
t
r
≤
2.5 ns, t
f
≤
2.5 ns.
2. The outputs are measured one at a time with one transition per
measurement.
V
OL
+ 0.3V
V
OL
V
OH
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.
SA00029
Waveform 2. Waveforms Showing the 3-State Output Enable
and Disable Times
1999 Oct 28
5
