1
IDT74CBTLV6800
LOW-VOLTAGE 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
2
11
A1
A10
23
14
SW
SW
B1
B10
BIA SV
13
1
OE
APRIL 2001
2001 Integrated Device Technology, Inc.
DSC-5739/-
c
IDT74CBTLV6800
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
LOW-VOLTAGE 10-BIT
BUS SWITCH WITH
PRECHARGED OUTPUTS
DESCRIPTION:
The CBTLV6800 provides 10-bits of high-speed bus switching with low
on-state resistance of the switch allowing connections to be made with
minimal propagation delay. The device also precharges the B port to a
user-selectable bias voltage (BIASV) to minimize live-insertion noise.
The CBTLV6800 is organized as a single 10-bit bus switch with a single
output-enable (
OE) input. When OE is low, the 10-bit bus switch is on and
port A is connected to port B. When
OE is high, the switch is open, and a
high impedance state exists between the two ports, and port B is precharged
to BIASV through the equivalent of a 10-k
resistor.
To ensure the high-impedance state during power up or power down,
OE should be tied to V
CC
through a pullup resistor; the minimum value of
the resistor is determined by the current-sinking capability of the driver.
OE
A
B
SIMPLIFIED SCHEMATIC, EACH
SWITCH
FEATURES:
-
Functionally equivalent to QS3800
-
5
A/B bi-directional switch
-
Isolation Under Power-Off Conditions
-
Over-voltage tolerant
-
Latch-up performance exceeds 100mA
-
V
CC
= 2.3V - 3.6V, normal range
-
ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
-
Available in SSOP, QSOP, and TSSOP packages
APPLICATIONS:
-
3.3V High Speed Bus Switching and Bus Isolation
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
2
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLV6800
LOW-VOLTAGE 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
PIN CONFIGURATION
SSOP/ QSOP/ TSSOP
TOP VIEW
V
C C
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
A
1
A
2
A
3
A
4
A
6
A
7
A
8
A
9
A
10
OE
B
10
BIASV
A
5
GND
B
1
2
3
4
5
6
7
8
9
10
1
11
12
13
14
15
16
17
18
19
20
21
22
23
24
SO24-7
SO24-8
SO24-9
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max.
Unit
V
CC
Supply Voltage Range
0.5 to 4.6
V
BIASV
Bias Voltage Range, V
I
0.5 to 4.6
V
V
I
Input Voltage Range
0.5 to 4.6
V
Continuous Channel Current
128
mA
I
IK
Input Clamp Current, , V
I/O
< 0
50
mA
T
STG
Storage Temperature
65 to +150
C
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM
RATINGS may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these or
any other conditions above those indicated in the operational sections
of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability.
FUNCTION TABLE
(1)
Input OE
Inputs/Outputs
L
A Port = B Port
H
A Port = Z
B Port = BIASV
OPERATING CHARACTERISTICS
Symbol
Parameter
Test Conditions
Min.
Max.
Unit
V
CC
Supply Voltage
2.3
3.6
V
BIASV
Bias Voltage
1.3
V
CC
V
V
IH
High-Level Control Input Voltage
V
CC
= 2.3V to 2.7V
1.7
--
V
V
CC
= 2.7V to 3.6V
2
--
V
IL
Low-Level Control Input Voltage
V
CC
= 2.3V to 2.7V
--
0.7
V
V
CC
= 2.7V to 3.6V
--
0.8
T
A
Operating Free-Air Temperature
-
40
+85
C
NOTE:
1. All unused control inputs of the device must be held at V
CC
or GND to ensure proper device operation.
3
IDT74CBTLV6800
LOW-VOLTAGE 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= 40C to +85C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
IK
Control Inputs, Data I/O
V
CC
= 3V, I
I
=
-
18mA
--
--
1.2
V
I
I
Control Inputs, Data I/O
V
CC
= 3.6V, V
I
= V
CC
or GND
--
--
1
A
I
OZ
Data I/O
V
CC
= 3.6V, V
O
= 0V or 3.6V switch disabled
--
--
20
A
I
OFF
V
CC
= 0, V
I
or V
O
= 0 to 3.6V
--
--
50
A
|I
O
|
V
CC
= 3V, BIASV = 2.4V, V
O
= 0,
OE
= V
CC
0.25
--
--
mA
I
CC
V
CC
= 3.6V, I
O
= 0, V
I
= V
CC
or GND
--
--
10
A
I
CC
(1)
Control Inputs
V
CC
= 3.6V, One input at 3V
,
Other inputs at V
CC
or GND
--
--
300
A
C
I
Control Inputs
V
I
= 3V or 0
--
4
--
pF
C
IO(OFF)
V
O
= 3V or 0, Switch Off, BIASV = Open,
OE
= V
CC
--
7
--
pF
V
CC
= 2.3V
V
I
= 0
I
I
= 64mA
--
5
8
Typ at V
CC
= 2.5V
I
I
= 24mA
--
5
8
R
ON
(2)
V
I
= 1.7V
I
I
= 15mA
--
27
40
V
I
= 0
I
I
= 64mA
--
5
7
V
CC
= 3V
I
I
= 24mA
--
5
7
V
I
= 2.4V
I
I
= 15mA
--
10
15
NOTES:
1. The increase in supply current is attributable to each input that is at the specified voltage level rather than V
CC
or GND.
2. This is measured by the voltage drop between the A and B terminals at the indicated current through the switch. On-state resistance is determined
by the lower of the voltages of the two (A or B) terminals.
SWITCHING CHARACTERISTICS
V
CC
= 2.5V 0.2V
V
CC
= 3.3V 0.3V
Symbol
Parameter
Min.
Max.
Min.
Max.
Unit
t
PD(1)
Propagation Delay
A to B or B to A
--
0.15
--
0.25
ns
t
PZH
BIASV = GND
OE
to A or B
1
4.8
1
4.5
ns
t
PZL
BIASV = 3V
OE
to A or B
1
4.8
1
4.5
ns
t
PHZ
BIASV = GND
OE
to A or B
1
5.6
1
5.5
ns
t
PLZ
BIASV = 3V
OE
to A or B
1
5.6
1
5.5
ns
NOTE:
1. The propagation delay is the calculated RC time constant of the typical on-state resistance of the switch and the specified load capacitance when
driven by an ideal voltage source (zero output impededance).
4
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLV6800
LOW-VOLTAGE 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
Open
V
LOA D
GND
V
CC
Pulse
Generator
D.U.T.
500
500
C
L
R
T
V
IN
V
OUT
(1, 2)
SAME PHASE
INPUT TRANSITION
OPPOSITE PHASE
INPUT TRANSITION
0V
0V
V
OH
V
O L
t
PLH
t
PHL
t
PHL
t
PLH
OUTPUT
V
IH
V
T
V
T
V
IH
V
T
CONTROL
INPUT
t
PLZ
0V
OUTPUT
NORMALLY
LOW
t
PZH
0V
SW ITCH
CL O SE D
OUTPUT
NORMALLY
HIGH
ENABLE
DISABLE
SW ITCH
O P E N
t
PHZ
0V
V
OL +
V
LZ
V
OH
V
T
V
T
t
PZL
V
LOA D/2
V
LOA D/2
V
IH
V
T
V
OL
V
OH -
V
HZ
TEST CIRCUITS AND WAVEFORMS
PROPAGATION DELAY
TEST CIRCUITS FOR ALL OUTPUTS
ENABLE AND DISABLE TIMES
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse
Generator.
NOTES:
1. Pulse Generator for all pulses: Rate
10MHz; t
F
2.5ns; t
R
2.5ns.
2. Pulse Generator for all pulses: Rate
10MHz; t
F
2ns; t
R
2ns.
SWITCH POSITION
Test
Switch
t
PLZ
/t
PZL
V
LOAD
t
PHZ/
t
PZH
GND
t
PD
Open
NOTE:
1. Diagram shown for input control Enable-LOW and input Control
Disable-HIGH.
TEST CONDITIONS
Symbol
V
CC
(1)
= 3.3V 0.3V
V
CC
(2)
= 2.5V 0.2V
Unit
V
LOAD
6
2 x Vcc
V
V
IH
3
Vcc
V
V
T
1.5
V
CC
/2
V
V
LZ
300
150
mV
V
HZ
300
150
mV
C
L
50
30
pF
5
IDT74CBTLV6800
LOW-VOLTAGE 10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XX
CBTLV
XXX
XX
Package
Device Type
Tem p. R ange
PY
Q
PG
74
Shrink S m all Outline Package (S O20-7)
Quarter-size Sm all Outline Package (SO20-8)
Thin Shrink Sm all Outline Package (SO20-9)
Low -Voltage 10-Bit Bus Switch with Precharged Outputs
40C to +85C
6800
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
2975 Stender Way
800-345-7015 or 408-727-6116
logichelp@idt.com
Santa Clara, CA 95054
fax: 408-492-8674
(408) 654-6459
www.idt.com
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