2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
®
PRODUCTS 2.5V
/ 3.3V 8:1 MUX/DEMUX HIGH
BANDWIDTH BUS SWITCH
FEATURES:
DESCRIPTION:
IDTQS3VH251
• N channel FET switches with no parasitic diode to V
CC
– Isolation under power-off conditions
– No DC path to V
CC
or GND
– 5V tolerant in OFF and ON state
• 5V tolerant I/Os
Ω
• Low R
ON
- 4Ω typical
• Flat R
ON
characteristics over operating range
• Rail-to-rail switching 0 - 5V
• Bidirectional dataflow with near-zero delay: no added ground
bounce
• Excellent R
ON
matching between channels
• V
CC
operation: 2.3V to 3.6V
• High bandwidth - up to 500MHz
• LVTTL-compatible control Inputs
• Undershoot Clamp Diodes on all switch and control Inputs
• Low Demux capacitance, 4pF typical
• Available in QSOP and TSSOP packages
The QS3VH251 HotSwitch Quad 2:1 multiplexer/demultiplexer is a high
bandwidth bus switch. The QS3VH251 has very low ON resistance, resulting
in under 250ps propagation delay through the switch. The Select (Sx) input
controls the data flow. The multiplexers/demultiplexers are enabled when the
Enable (E) input is low. In the ON state, the switches can pass signals up to 5V.
In the OFF state, the switches offer very high impedence at the terminals.
The combination of near-zero propagation delay, high OFF impedance, and
over-voltage tolerance makes the QS3VH251 ideal for high performance
comminucation applications.
The QS3VH251 is characterized for operation from -40°C to +85°C.
APPLICATIONS:
•
•
•
•
•
Hot-swapping
Multiplexing/demultiplexing
Low distortion analog switch
Replaces mechanical relay
ATM 25/155 switching
FUNCTIONAL BLOCK DIAGRAM
S0
S1
S2
E
I0
I1
I2
Y
I3
I4
I5
I6
I7
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2002 Integrated Device Technology, Inc.
AUGUST 2002
DSC-5944/7
IDTQS3VH251
2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max
V
TERM
(2)
V
TERM
(3)
V
TERM
(3)
V
AC
I
OUT
T
STG
SupplyVoltage to Ground
DC Switch Voltage V
S
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤20ns)
DC Output Current (max. sink current/pin)
Storage Temperature
–0.5 to +4.6
–0.5 to +5.5
–0.5 to +5.5
–3
120
–65 to +150
Unit
V
V
V
V
mA
°C
I
3
I
2
I
1
I
0
Y
NC
E
GND
1
2
3
4
5
6
7
8
QSOP/ TSSOP
TOP VIEW
16
15
14
13
12
11
10
9
V
CC
I
4
I
5
I
6
I
7
S
0
S
1
S
2
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.
2. V
CC
terminals.
3. All terminals except V
CC
.
CAPACITANCE
(T
A
= +25°C, F = 1MHz, V
IN
= 0V, V
OUT
= 0V)
Symbol
C
IN
C
I/O
C
I/O
Parameter
(1)
Control Inputs
Quickswitch Channels
(Switch OFF)
Quickswitch Channels
(Switch ON)
Demux
Mux
Demux
Mux
Typ.
3
4
19
20
20
Max.
5
6
25
28
28
pF
Unit
pF
pF
NOTE:
1. This parameter is guaranteed but not production tested.
FUNCTION TABLE
(1)
Select
E
H
L
L
L
L
L
L
L
L
S
2
X
L
L
L
L
H
H
H
H
S
1
X
L
L
H
H
L
L
H
H
S
0
X
L
H
L
H
L
H
L
H
Y
Z
I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
Function
Disable
S
2
- S
0
= 0
S
2
- S
0
= 1
S
2
- S
0
= 2
S
2
- S
0
= 3
S
2
- S
0
= 4
S
2
- S
0
= 5
S
2
- S
0
= 6
S
2
- S
0
= 7
PIN DESCRIPTION
Pin Names
I
0
- I
7
S
0
- S
2
E
Y
I/O
I
I
I
O
Description
Data Inputs
Select Input
Enable Input
Data Outputs
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedence
2
IDTQS3VH251
2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= –40°C to +85°C, V
CC
= 3.3V ±0.3V
Symbol
V
IH
V
IL
I
IN
I
OZ
I
OFF
R
ON
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Leakage Current (Control Inputs)
Off-State Current (Hi-Z)
Data Input/Output Power Off Leakage
Switch ON Resistance
for Control Inputs
Guaranteed Logic LOW
for Control Inputs
0V
≤
V
IN
≤
V
CC
0V
≤
V
OUT
≤
5V, Switches OFF
V
IN
or V
OUT
0V to 5V, V
CC
= 0V
V
CC
= 2.3V
Typical at V
CC
= 2.5V
V
CC
= 3V
NOTE:
1. Typical values are at V
CC
= 3.3V and T
A
= 25°C.
Test Conditions
Guaranteed Logic HIGH
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
Min.
1.7
2
—
—
—
—
—
Typ.
(1)
Max.
—
—
—
—
—
—
—
6
7
4
5
—
—
0.7
0.8
±1
±1
±1
8
9
6
8
Unit
V
V
µA
µA
µA
Ω
V
IN
= 0V
V
IN
= 1.7V
V
IN
= 0V
V
IN
= 2.4V
I
ON
= 30mA
I
ON
= 15mA
I
ON
= 30mA
I
ON
= 15mA
—
—
—
—
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 3.3V
16
14
R
ON
(ohms)
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
V
IN
(Volts)
3
IDTQS3VH251
2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current
(2,3)
per Input HIGH
Dynamic Power Supply Current
(4)
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
V
CC
= Max., V
IN
= 3V, f = 0 per Control Input
V
CC
= 3.3V, A and B Pins Open, Control Inputs
Toggling @ 50% Duty Cycle
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per input driven at the specified level. Mux/demux pins do not contribute to
∆Icc.
3. This parameter is guaranteed but not tested.
4. This parameter represents the current required to switch internal capacitance at the specified frequency. The mux/demux inputs do not contribute to the Dynamic Power Supply
Current. This parameter is guaranteed but not production tested.
Min.
—
—
Typ.
1
—
Max.
4
30
Unit
mA
µA
See Typical I
CCD
vs Enable Frequency graph below
TYPICAL I
CCD
vs ENABLE FREQUENCY CURVE AT V
CC
= 3.3V
6
4
I
CCD
(mA)
2
0
0
2
4
6
8
10
12
14
16
18
20
ENABLE FREQUENCY (MHz)
4
IDTQS3VH251
2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40°C to +85°C
V
CC
= 2.5 ± 0.2V
(1)
Symbol
t
PLH
t
PHL
t
SEL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
f
EorSx
Parameter
Data Propagation Delay
(2,3)
Y to Ix or Ix to Y
Select Time
Sx to Y
Enable Time
S to Ix
Disable Time
S to Ix
Enable Time
E
to Y or Ix
Disable Time
E
to Y or Ix
Operating Frequency - Enable
(2,5)
Min
.
(4)
V
CC
= 3.3 ± 0.3V
(1)
Min
.
(4)
⎯
1.5
1.5
1.5
1.5
1.5
Max.
0.2
8
9
8
8
8
20
Unit
ns
ns
ns
ns
ns
ns
MHz
Max.
0.2
9
9
8
9
8
10
⎯
1.5
1.5
1.5
1.5
1.5
⎯
⎯
NOTES:
1. See Test Conditions under TEST CIRCUITS AND WAVEFORMS.
2. This parameter is guaranteed but not production tested.
3. The bus switch contributes no propagation delay other than the RC delay of the ON resistance of the switch and the load capacitance. The time constant for the switch alone
is of the order of 0.2ns at C
L
= 50pF. Since this time constant is much smaller than the rise and fall times of typical driving signals, it adds very little propagation delay to the
system. Propagation delay of the bus switch, when used in a system, is determined by the driving circuit on the driving side of the switch and its interaction with the load on
the driven side.
4. Minimums are guaranteed but not production tested.
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