LOW-VOLTAGE 20-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
LOW-VOLTAGE 20-BIT
BUS SWITCH WITH
PRECHARGED OUTPUTS
FEATURES:
•
•
•
•
•
•
IDT74CBTLV16800
5Ω A/B bi-directional switch
Ω
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, TSSOP, and TVSOP packages
DESCRIPTION:
APPLICATIONS:
• 3.3V High Speed Bus Switching and Bus Isolation
The CBTLV16800 provides 20-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 CBTLV16800 is organized as dual 10-bit bus switches with two
different output-enable (OE) control inputs. When
OE
is low, the corre-
sponding 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-kΩ 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.
FUNCTIONAL BLOCK DIAGRAM
1
1A1
2
SW
SIMPLIFIED SCHEMATIC, EACH
SWITCH
BIASV
1B1
46
1A10
12
SW
36
1B10
A
B
1OE
48
2A1
13
SW
35
2B1
OE
2A10
24
SW
25
2B10
2OE
1
INDUSTRIAL TEMPERATURE RANGE
1
c
2002 Integrated Device Technology, Inc.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
AUGUST 2002
DSC-5886/6
IDT74CBTLV16800
LOW-VOLTAGE 20-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
Description
Supply Voltage Range
Bias Voltage Range, V
I
Input Voltage Range
Continuous Channel Current
I
IK
T
STG
Input Clamp Current, V
I/O
< 0
Storage Temperature Range
Max.
–0.5 to 4.6
–0.5 to 4.6
–0.5 to 4.6
128
–50
–65 to +150
Unit
V
V
V
mA
mA
°C
BIASV
1
A
1
1
A
2
1
A
3
1
A
4
1
A
5
1
A
6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
1OE
2OE
1
B
1
1
B
2
1
B
3
1
B
4
1
B
5
BIASV
V
I
GND
1
A
7
1
A
8
1
A
9
1
A
10
2
A
1
2
A
2
GND
1
B
6
1
B
7
1
B
8
1
B
9
1
B
10
2
B
1
2
B
2
2
B
3
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.
V
CC
2
A
3
FUNCTION TABLE
(EACH 10-BIT BUS SWITCH)
(1)
Input
OE
L
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
Inputs/Outputs
A-Port = B-Port
A-Port = Z
B-Port = BIASV
GND
2
A
4
2
A
5
2
A
6
2
A
7
2
A
8
2
A
9
2
A
10
GND
2
B
4
2
B
5
2
B
6
2
B
7
2
B
8
2
B
9
2
B
10
SSOP/ TSSOP/ TVSOP
TOP VIEW
OPERATING CHARACTERISTICS
(1)
Symbol
V
CC
BIASV
V
IH
V
IL
T
A
Bias Voltage
High-Level Control Input Voltage
Low-Level Control Input Voltage
Operating Free-Air Temperature
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
NOTE:
1. All unused control inputs of the device must be held at V
CC
or GND to ensure proper device operation.
Parameter
Supply Voltage
Test Conditions
Min.
2.3
1.3
1.7
2
—
—
–40
Max.
3.6
V
CC
—
—
0.7
0.8
+85
Unit
V
V
V
V
°C
2
IDT74CBTLV16800
LOW-VOLTAGE 20-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
= –40°C to +85°C
Symbol
V
IK
I
I
I
OZ
I
OFF
I
O
I
CC
∆I
CC(1)
C
I
C
IO(OFF)
V
CC
= 2.3V
Typ. at V
CC
= 2.5V
R
ON
V
CC
= 3V
V
I
= 2.4V
V
I
= 1.7V
V
I
= 0
Control Inputs
Control Inputs
Parameter
Control Inputs, Data I/O
Control Inputs
Data I/O
A Port
Test Conditions
V
CC
= 3V, I
I
= –18mA
V
CC
= 3.6V, V
I
= V
CC
or GND
V
CC
= 3.6V, V
O
= 0V or 3.6V switch disabled
V
CC
= 0V, V
I
or V
O
= 0V or 3.6V
V
CC
= 3V, BIASV = 2.4V, V
O
= 0,
OE
= V
CC
V
CC
= 3.6V, I
O
= 0, V
I
= V
CC
or GND
V
CC
= 3.6V, one input at 3V, other inputs at V
CC
or GND
V
I
= 3V or 0
V
O
= 3V or 0, switch off, BIASV = open,
OE
= V
CC
V
I
= 0
I
I
= 64mA
I
I
= 24mA
I
I
= 15mA
I
I
= 64mA
I
I
= 24mA
I
I
= 15mA
Min.
—
—
—
—
| 0.25 |
—
—
—
—
—
—
—
—
—
—
Typ.
—
—
—
—
—
—
—
4
6.5
5
5
25
5
5
10
Max.
–1.2
±1
5
10
—
10
300
—
—
9
9
35
7
7
15
Ω
Unit
V
µA
µA
µA
mA
µA
µA
pF
pF
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
Symbol
t
PD(1)
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
A to B or B to A
BIASV = GND
OE
to A or B
BIASV = 3V
OE
to A or B
BIASV = GND
OE
to A or B
BIASV = 3V
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).
V
CC
= 3.3V ± 0.3V
Min.
—
2.2
2.1
2.6
1.5
Max.
0.25
5.5
5.3
7.6
5.1
Unit
ns
ns
ns
ns
ns
Parameter
Min.
—
2.9
2.8
1.4
1.3
Max.
0.15
7.7
6.4
6.8
4.2
3
IDT74CBTLV16800
LOW-VOLTAGE 20-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol
V
LOAD
V
IH
V
T
V
LZ
V
HZ
C
L
V
CC(1)
= 3.3V±0.3V
6
3
1.5
300
300
50
V
CC(2)
= 2.5V±0.2V
2 x Vcc
Vcc
Vcc / 2
150
150
30
Unit
V
V
V
mV
mV
pF
OPPOSITE PHASE
INPUT TRANSITION
SAME PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
t
PHL
t
PH L
V
IH
V
T
0V
V
OH
V
T
V
OL
V
IH
V
T
0V
Propagation Delay
V
CC
500
Ω
Pulse
Generator
(1, 2)
V
LOAD
ENABLE
Open
GND
CONTROL
INPUT
t
PZL
OUTPUT
SW ITCH
NORMALLY
CLO SED
LOW
t
PZH
OUTPUT
SW ITCH
NORMALLY
O PEN
HIGH
V
LO AD/2
V
T
DISABLE
V
IH
V
T
0V
V
LOAD/2
V
OL +
V
LZ
V
OL
V
OH
V
OH -
V
HZ
0V
V
IN
D.U.T.
V
OUT
t
PLZ
R
T
500
Ω
C
L
t
PHZ
V
T
0V
Test Circuits for All Outputs
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.
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
Enable and Disable Times
SWITCH POSITION
Test
t
PLZ
/t
PZL
t
PHZ
/t
PZH
t
PD
Switch
V
LOAD
GND
Open
4
IDT74CBTLV16800
LOW-VOLTAGE 20-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
CBTLV
XXX
XX
IDT
XX
Temp. Range
Device Type Package
PV
PA
PF
Shrink Small Outline Package
Thin Shrink Small Outline Package
Thin Very Small Outline Package
16800 Low-Voltage 20-Bit Bus Switch with Precharged Outputs
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