IDT74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
LOW-VOLTAGE
QUAD 2:1MUX/DEMUX
BUS SWITCH
FEATURES:
−
−
−
−
−
−
−
−
Functionally equivalent to QS3257
5Ω Switch Connection between Two Ports
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
IDT74CBTLV3257
DESCRIPTION:
The CBTLV3257 is a quad 2:1 multiplexer/demultiplexer. The low on-
state resistance of the switch allows connections to be made with minimal
propagation delay.
The select (S) input controls the data flow. The multiplexers/demultiplexers
are enabled when the output-enable (OE) input is low.
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.
APPLICATIONS:
−
3.3V High Speed Bus Switching, Multiplexing, and Bus Isolation
FUNCTIONAL BLOCK DIAGRAM
SIMPLIFIED SCHEMATIC, EACH
SWITCH
1B1
1A
SW
SW
1B2
2A
SW
2B1
SW
2B2
A
B
3A
SW
3B1
SW
3B2
4A
SW
4B1
SW
4B2
FROM ENABLE
CIRCUITRY
S
OE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2001 Integrated Device Technology, Inc.
SEPTEMBER 2001
DSC-5744/1
IDT74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
Description
Supply Voltage Range
Input Voltage Range
Continuous Channel Current
I
IK
Input Clamp Current, V
I/O
< 0
Storage Temperature
T
STG
Max.
–0.5 to 4.6
–0.5 to 4.6
128
–50
–65 to +150
Unit
V
V
mA
mA
°C
S
1B1
1B2
1A
2B1
2B2
2A
GND
1
2
3
4
5
6
7
8
16
15
14
SO16-7 13
SO16-9
SO16-10 12
11
10
9
V
CC
OE
4B1
4B2
4A
3B1
3B2
3A
V
I
NOTES:
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.
QSOP/ SSOP/ TSSOP
TOP VIEW
FUNCTION TABLE
(1)
Inputs
OE
L
L
H
S
L
H
X
Function
A Port = B1 Port
A Port = B2 Port
Disconnect
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
OPERATING CHARACTERISTICS, T
A
= 25°C
Symbol
V
CC
V
IH
V
IL
T
A
Parameter
Supply 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 operation.
Test Conditions
Min.
2.3
1.7
2
—
—
−40
Max.
3.6
—
—
0.7
0.8
+85
Unit
V
V
V
°C
2
IDT74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
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
CC
∆I
CC
(2)
C
I
C
IO(OFF)
Control Inputs
Control Inputs
A port
B port
Max at V
CC
= 2.3V
Typ at V
CC
= 2.5V
R
ON
(3)
Parameter
Control Inputs, Data I/O
Control Inputs, Data I/O
Data I/O
Test Conditions
V
CC
= 3V, I
I
=
−18mA
V
CC
= 3.6V, V
I
= V
CC
or GND
V
CC
= 3.6V, V
O
= 0 or 3.6V, switch disabled
V
CC
= 0, V
I
or V
O
= 0 to 3.6V
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,
OE
= V
CC
= 3.3V
V
I
= 0
V
I
= 1.7V
V
I
= 0
I
O
= 64mA
I
O
= 24ma
I
O
= 15mA
I
O
= 64mA
I
O
= 24mA
V
I
= 2.4V
I
O
= 15mA
Min.
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
4
13
6
5
5
27
5
5
10
Max.
– 1.2
±1
20
50
10
300
—
—
—
8
8
40
7
7
15
Unit
V
µA
µA
µA
µA
µA
pF
pF
Ω
V
CC
= 3V
NOTES:
1. Typical values are at V
CC
= 3.3V, +25°C 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.
SWITCHING CHARACTERISTICS
V
CC
= 2.5V ± 0.2V
Symbol
t
PD(1)
t
SEL
t
EN
t
DIS
t
EN
t
DIS
Parameter
Propagation Delay
A to B or B to A
Select Time
S to A or B
Enable Time
S to B
Disable Time
S to B
Enable Time
OE
to A or B
Disable Time
OE
to A or B
Min.
−
1
1
1
1
1
Max.
0.15
6.1
6.1
4.8
5.6
5.5
V
CC
= 3.3V ± 0.3V
Min.
−
1
1
1
1
1
Max.
0.25
5.3
5.3
4.5
5
5.5
Unit
ns
ns
ns
ns
ns
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 impedance).
3
IDT74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
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
V
CC
/2
150
150
30
Unit
V
V
V
mV
mV
pF
OPPO SITE PHASE
INPUT TRANSITIO N
OUTPUT
t
PLH
t
PHL
PROPAGATION DELAY/ SELECT TIME
SAME PHASE
INPUT TRANSITIO N
t
PLH
t
PHL
V
IH
V
T
0V
V
OH
V
T
V
OL
V
IH
V
T
0V
TEST CIRCUITS FOR ALL OUTPUTS
V
CC
500
Ω
Pulse
Generator
(1, 2)
ENABLE AND DISABLE TIMES
ENABLE
DISABLE
V
IH
V
T
0V
V
LOAD/2
V
OL +
V
LZ
V
OL
V
OH
V
OH -
V
HZ
0V
V
LOAD
Open
GND
CONTROL
INPUT
t
PZL
OUTPUT
SW ITCH
NORMALLY
CLOSED
LOW
t
PZH
OUTPUT
SW ITCH
NORMALLY
OPEN
HIGH
V
LOAD/2
V
T
V
IN
D.U.T.
V
OUT
t
PLZ
R
T
500
Ω
C
L
t
PHZ
V
T
0V
DEFINITIONS:
C
L
= Load capacitance: includes jig and load 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.
SWITCH POSITION
Test
t
PLZ
/
t
PZL
t
PHZ/
t
PZH
t
PD
t
SEL
Switch
V
LOAD
GND
Open
Open
4
IDT74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XX
CBTLV
XXX
Device Type
XX
Package
Temp. Range
Q
PY
PG
Quarter-Size Small Outline Package (SO16-7)
Shrink Small Outline Package (SO16-9)
Thin Shrink Small Outline Package (SO16-10)
3257
Low-Voltage Quad 2:1 Mux/Demux Bus Switch
74
–40°C to +85°C
CORPORATE HEADQUARTERS
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Santa Clara, CA 95054
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800-345-7015 or 408-727-6116
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www.idt.com
for Tech Support:
logichelp@idt.com
(408) 654-6459
5
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