1
IDT74CBTLV3251
LOW-VOLTAGE 8:1 MULTIPLEXER/DEMULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
APRIL 2001
2001 Integrated Device Technology, Inc.
DSC-5403/-
c
IDT74CBTLV3251
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
LOW-VOLTAGE
8:1 MULTIPLEXER/
DEMULTIPLEXER
A
B2
B6
B1
B5
B3
B4
B7
B8
SW
SW
SW
SW
SW
SW
SW
SW
4
3
12
13
S0
S1
S2
OE
11
10
9
7
5
2
1
15
14
DESCRIPTION:
The CBTLV3251 is a 1-of-8 high-speed multiplexer/demultiplexer. The
low on-state resistance of the switch allows connections to be made with
minimal propagation delay.
The select input (S0, S1, S2) controls the data flow. The multiplexer/
demultiplexer switches are disabled when the output-enable (
OE) input is
high.
To ensure that the device is in 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.
FEATURES:
-
Functionally equivalent to QS3251
-
5
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
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
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INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLV3251
LOW-VOLTAGE 8:1 MULTIPLEXER/DEMULTIPLEXER
PIN CONFIGURATION
QSOP/ SSOP/ TSSOP
TOP VIEW
V
C C
B4
B6
B2
B7
B1
B8
A
S0
NC
S1
OE
B3
B5
GND
S2
SO16-7
SO16-9
SO16-10
16
1
3
14
4
13
5
12
6
11
7
10
2
15
9
8
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 operation.
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
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)
Inputs
OE
S2
S1
S0
Function
L
L
L
L
A Port = B1 Port
L
L
L
H
A Port = B2 Port
L
L
H
L
A Port = B3 Port
L
L
H
H
A Port = B4 Port
L
H
L
L
A Port = B5 Port
L
H
L
H
A Port = B6 Port
L
H
H
L
A Port = B7 Port
L
H
H
H
A Port = B8 Port
H
X
X
X
Disconnect
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
SIMPLIFIED SCHEMATIC, EACH
SWITCH
C O N TR O L
C IR C U ITR Y
A
B
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IDT74CBTLV3251
LOW-VOLTAGE 8:1 MULTIPLEXER/DEMULTIPLEXER
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.
(1)
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
= 0 or 3.6V, switch disabled
--
--
20
A
I
OFF
V
CC
= 0, V
I
or V
O
= 0 to 3.6V
--
--
50
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)
A port
V
O
= 3V or 0,
OE = V
CC
= 3.3V
--
40.5
--
pF
B port
--
6
--
Max at V
CC
= 2.3V
V
I
= 0
I
O
= 64mA
--
5
8
Typ at V
CC
= 2.5V
I
O
= 24ma
--
5
8
R
ON
(3)
V
I
= 1.7V
I
O
= 15mA
--
27
40
V
I
= 0
I
O
= 64mA
--
5
7
V
CC
= 3V
I
O
= 24mA
--
5
7
V
I
= 2.4V
I
O
= 15mA
--
10
15
NOTES:
1. Typical values are at V
CC
= 3.3V, +25C ambient.
2. The increase in supply current is attributable to each output 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
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
SEL
Select Time
S to A or B
1
4.8
1
4.5
ns
t
EN
Enable Time
S to B
1
4.8
1
4.5
ns
t
DIS
Disable Time
S to B
1
5.1
1
5.3
ns
t
EN
Enable Time
OE to A or B
1
5
1
4.8
ns
t
DIS
Disable Time
OE to A or B
1
5.5
1
6
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).
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INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLV3251
LOW-VOLTAGE 8:1 MULTIPLEXER/DEMULTIPLEXER
Open
V
LO AD
GND
V
C C
Pulse
Generator
D.U.T.
500
500
C
L
R
T
V
IN
V
O U T
(1, 2)
SAME PHASE
INPUT TRANSITION
OPPOSITE PHASE
INPUT TRANSITION
0V
0V
V
OH
V
O L
t
PLH
t
PH L
t
PH L
t
PLH
OUTPUT
V
IH
V
T
V
T
V
IH
V
T
CONTROL
INPUT
t
PLZ
0V
OUTPUT
NORMALLY
LOW
t
P Z H
0V
SW ITCH
CLO SE D
OUTPUT
NORMALLY
HIGH
ENABLE
DISABLE
SW ITCH
O P E N
t
PH Z
0V
V
O L +
V
LZ
V
O H
V
T
V
T
t
PZL
V
LO AD /2
V
LO AD /2
V
IH
V
T
V
O L
V
O H -
V
H Z
TEST CIRCUITS AND WAVEFORMS
PROPAGATION DELAY/ SELECT TIME
TEST CIRCUITS FOR ALL OUTPUTS
ENABLE AND DISABLE TIMES
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
SWITCH POSITION
Test
Switch
t
PLZ
/ t
PZL
V
LOAD
t
PHZ
/ t
PZH
GND
t
PD
Open
t
SEL
Open
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.
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IDT74CBTLV3251
LOW-VOLTAGE 8:1 MULTIPLEXER/DEMULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XX
C BTLV
XXX
XX
Package
D evice Type
Tem p. R ange
Q
PY
PG
74
Quarter-Size S mall Outline Package (SO 16-7)
Shrink Sm all Outline Package (S O16-9)
Thin S hrink Sm all Outline Package (SO16-10)
Low -Voltage 1-of-8 M ultiplexer/Dem ultiplexer
40C to +85C
3251
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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