1
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLVR3861
LOW-VOLTAGE 10-BIT BUS SWITCH
AUGUST 2002
2002 Integrated Device Technology, Inc.
DSC-5392/9
c
INDUSTRIAL TEMPERATURE RANGE
APPLICATIONS:
3.3V High Speed Bus Switching and Bus Isolation
FEATURES:
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
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
IDT74CBTLVR3861
PRELIMINARY
FUNCTIONAL BLOCK DIAGRAM
SIMPLIFIED SCHEMATIC, EACH
SWITCH
LOW-VOLTAGE 10-BIT
BUS SWITCH
DESCRIPTION:
The CBTLVR3861 is a ten bit high-speed bus switch. It adds an internal
series resistor with each switch to reduce reflection noise in high-speed
applications. When closed, the switch acts as a source (series) termination
for the driver connected to it.
The device is organized as one 10-bit bus switch. When output enable
(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.
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.
2
11
23
A1
A10
OE
SW
SW
B10
B1
22
13
OE
A
B
2
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLVR3861
LOW-VOLTAGE 10-BIT BUS SWITCH
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max.
Unit
V
CC
Supply Voltage Range
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 Range
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.
PIN CONFIGURATION
OPERATING CHARACTERISTICS
(1)
Symbol
Parameter
Test Conditions
Min.
Max.
Unit
V
CC
Supply Voltage
2.3
3.6
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.
SSOP/ QSOP/ TSSOP
TOP VIEW
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
FUNCTION TABLE
(1)
Input
OE
Function
L
A Port = B Port
H
Disconnect
A
10
11
B
9
14
A
9
10
B
8
15
GND
12
B
10
13
V
CC
24
1
NC
OE
A
1
2
23
B
1
A
2
3
22
B
2
A
3
4
21
B
3
A
4
5
20
B
4
A
5
6
19
B
5
A
6
7
18
B
6
A
7
8
17
B
7
A
8
9
16
3
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLVR3861
LOW-VOLTAGE 10-BIT BUS SWITCH
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= 40C to +85C
NOTES:
1. Typical values are at 3.3V, +25C ambient.
2. The increase in supply current is attributable to each input that is at the specified voltage level rather than V
CC
or GND.
3. 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.
Symbol
Parameter
Test Conditions
Min.
Typ.
(1)
Max.
Unit
V
IK
Control Inputs, Data I/O
V
CC
= 3V, I
I
= 18mA
--
--
1.2
V
I
I
Control Inputs
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
--
--
5
A
I
OFF
V
CC
= 0V, V
I
or V
O
= 0V to 3.6V
--
--
10
A
I
CC
V
CC
= 3.6V, I
O
= 0, V
I
= V
CC
or GND
--
--
10
A
I
CC(2)
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, OE = V
CC
--
8
--
pF
V
CC
= 2.3V
V
I
= 0
I
O
= 64mA
--
30
47
Typ. at V
CC
= 2.5V
I
O
= 24mA
--
30
47
R
ON(3)
V
I
= 1.7V
I
O
= 15mA
--
36
80
V
I
= 0
I
O
= 64mA
--
30
42
V
CC
= 3V
I
O
= 24mA
--
30
42
V
I
= 2.4V
I
O
= 15mA
--
32
47
V
CC
= 2.5V 0.2V
V
CC
= 3.3V 0.3V
Symbol
Parameter
Min.
Max.
Min.
Max.
Unit
t
PD(1)
Propagation Delay
--
0.9
--
1.5
ns
A to B or B to A
t
EN
Output Enable Time
1
6
1
5.3
ns
OE to A or B
t
DIS
Output DisableTime
1
5.5
1
5.5
ns
OE to A or B
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).
SWITCHING CHARACTERISTICS
4
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLVR3861
LOW-VOLTAGE 10-BIT BUS SWITCH
Open
V
LOAD
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
OL
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
SWITCH
CLOSED
OUTPUT
NORMALLY
HIGH
ENABLE
DISABLE
SWITCH
OPEN
t
PHZ
0V
V
OL +
V
LZ
V
OH
V
T
V
T
t
PZL
V
LOAD/2
V
LOAD/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
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
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.
Test
Switch
t
PLZ
/t
PZL
V
LOAD
t
PHZ
/t
PZH
GND
t
PD
Open
SWITCH POSITION
Symbol
V
CC(1)
= 3.3V0.3V
V
CC(2)
= 2.5V0.2V
Unit
V
LOAD
6
2 x Vcc
V
V
IH
3
Vcc
V
V
T
1.5
Vcc
/ 2
V
V
LZ
300
150
mV
V
HZ
300
150
mV
C
L
50
30
pF
TEST CONDITIONS
5
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLVR3861
LOW-VOLTAGE 10-BIT BUS SWITCH
ORDERING INFORMATION
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
IDT
XX
CBTLV
XXX
XX
Package
Device Type
Temp. Range
PY
Q
PG
74
Shrink Small Outline Package
Quarter-size Small Outline Package
Thin Shrink Small Outline Package
Low-Voltage 10-Bit Bus Switch
40C to +85C
3861
Family
X
25
series dampening resistors on A and B ports
R
PDF 
ZIP