VS3125
Quad Bus Switch with
Individual Active Low Enables
Applications
•=
•=
•=
5v to 3.3V translation in mixed supply environment
Hot Swap interface
Video, audio switching
•=
•=
Clock gating
Logic replacement
General Description
The VS3125 contains a set of four high-speed, low-resistance bus switches. Each bus switch is individually
controlled by TTL-compatible, active-low control input (/xOE). The low ON resistance of VS3125 allows
inputs to be connected to outputs without adding propagation delay and without generating additional signal
noise.
The VS3125 is function and pinout compatible with QS3125. It enables 5V to 3.3V level translation when
used with an external diode in the power supply line. In addition, the high off-isolation between switch
terminals in the ‘disable’ mode, and the near-zero propagation delay in the ‘on’ state make the VS3V125 an
ideal interface element for hot-swapping applications.
Features
•=
•=
•=
•=
•=
Enhanced N-FET with no dc path to V
CC
or
GND in normal operating signal voltage range.
Low impedance bidirectional data flow
Pin-compatible with QS3125 & PI5C3125
switches
Zero added ground bounce or signal noise
TTL-compatible control signals
•=
•=
•=
•=
•=
Near-zero propagation delay
Undershoot clamp diodes on all
switch and control pins
ESD rating >2000V (Human Body
Model) or >200V (Machine Model)
Latch-up current >100mA
Available in 150-mil wide QSOP
package
Figure 1. Functional Block Diagram
Figure 2. Pin Configuration
1A
/1OE
/2OE
/3OE
/4OE
1Y
2A
3A
4A
QSOP
NC
/1OE
1A
1Y
/2OE
2A
2Y
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
/4OE
4A
4Y
/3OE
3A
3Y
NC
2Y
3Y
4Y
All Pins, Top View
NC= No Connect
2001-04-12
Vaishali Semiconductor
Page 1
www.vaishali.com
747 Camden Avenue, Suite C Campbell CA 95008
MDSS-0011-01
Ph. 408.377.6060
Fax 408.377.6063
VS3125
Table 1. Pin Description
Name
1A – 4A
1Y – 4Y
/1OE - /4OE
I/O
I/O
I/O
I
Description
Data Input or Output
Data Input or Output
Bus Switch Enable
Table 2. Function Table
/xOE
L
H
Path
xA <-> xY
High Impedance
Function
Enable switch
Disable switch
Table 3. Absolute Maximum Ratings
Supply Voltage to Ground………………………….…..-0.5V to +7.0V
DC Switch Voltage V
S
……………………….………….-0.5V to +7.0V
DC Input Voltage V
IN
…………………………… ……...-0.5V to +7.0V
AC Input Voltage (Pulse Width < 20ns)……………….…………-3.0V
DC Output Sink Current per Switch Pin…………………...…..120mA
Maximum Power Dissipation…………………………….…..0.5 Watts
Storage Temperature………………………………...-65 C to +150 C
Note
ABSOLUTE MAXIMUM CONTINUOUS RATINGS are those values beyond which damage to the device may
occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability.
Functional operation under absolute maximum rated conditions is not implied.
o
o
Table 4. Capacitance
T
A
= 25 C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V
o
QSOP
Pins
Control Inputs
VSwitch Channels ( Switch OFF )
Typ
4
5
Max
5
7
Unit
pF
pF
Note
Capacitance is guaranteed, but not production tested. Total capacitance of a path, when the switch is closed, is
the sum of the switch terminal capacitances.
Table 5. Recommended Operating Conditions
Symbol
V
CC
V
IL
Parameter
Power supply voltage
Low level input voltage
(Control inputs)
Min
4.5
-0.5
Typ
Max
5.5
0.8
Units
V
V
V
IH
High level input voltage
(Control inputs)
2.0
5.5
V
o
T
A
2001-04-12
Operating free-air temperature
-40
85
C
MDSS-0011-01
Ph. 408.377.6060
Fax 408.377.6063
Note: All unused control inputs of the device must be held at Vcc or GND, to ensure proper device operation
Page 2
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747 Camden Avenue, Suite C Campbell CA 95008
Vaishali Semiconductor
VS3125
Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range
Symbol
V
IK
Parameter
Clamp Voltage
Test Conditions
Control Inputs
Switch I/O
V
CC
= Min., I
IK
= -18mA
Min
Typ
(1)
Max
-1.5
-1.5
Units
V
V
OH
Logic High Voltage
V
CC
= 4.3V,V
IN
= 5V
Switch I/O
V
IN
= V
CC
= 5V, I
OUT
= -5µA
V
CC
= 4.3V,V
IN
= 5V,
I
OUT
= -100µA
3.7
3.0
3.9
3.3
4.1
3.6
V
|I
I
|
|
OFF
|
Input Leakage
Current
Power OFF Leakage
Current
OFF State Leakage
Current
Switch I/O Drive
Current (Logic LOW)
Switch I/O Drive
Current (Logic HIGH)
Switch ON
(2)
Resistance
Control Inputs
Control Inputs
Switch I/O
Switch I/O
V
CC
= Max., V
I
= V
CC
or GND
V
CC
= 0, V
I
or V
O
= V
CC
or GND.
1
1
µA
µA
µA
|I
OZ
|
V
CC
= Max., V
I/O
= V
CC
,
/xOE= V
CC
1
I
ODL
I
ODH
V
CC
= Min, V
IN
= 0, V
OUT
= 0.4V
V
CC
= Min, V
IN
= V
CC
, V
OUT
= 2.4V
50
-50
(2)
mA
mA
R
ON
V
CC
= 3.0V, V
IN
= 0, I
OUT
= 15mA
5
7
Ω
Notes:
1.
2.
Typical value is specified at V
CC
= 5V and T
A
= 25 C.
R
ON
is measured by forcing specified current into the ‘output’ node of the switch with the ‘input’ node of the switch
at the specified voltage.
o
Table 7. Power Supply Characteristics Over Recommended Operating Free-air Temperature Range
Symbol
I
CCQ
∆I
CC
Parameter
Quiescent Power Supply Current
Power Supply Current per Input
(2)
High
Dynamic Power Supply Current
(3)
Test Conditions
(1)
Max
1
1.5
Units
µA
mA
V
CC
= Max.,/xOE = V
CC
or GND, f = 0
V
CC
= Max, V
IN
= 3.4V, f = 0
Q
CCD
V
CC
= Max, Switch pins open, Control Inputs
toggling at 50% duty cycle
0.25
mA/MHz
Notes:
1.
2.
3.
For conditions shown as Min or Max, use the appropriate values specified under Recommended Operating
Conditions.
Per control input. All other control inputs at GND. Switch I/O pins do not contribute to
∆I
CC
.
This parameter represents the average dc current resulting from the switching of internal nodes of the device at a
given frequency. The switch I/O pins make insignificant contribution to the dynamic power supply current of the
device. This parameter is guaranteed, but not production tested.
2001-04-12
Vaishali Semiconductor
Page 3
www.vaishali.com
747 Camden Avenue, Suite C Campbell CA 95008
MDSS-0011-01
Ph. 408.377.6060
Fax 408.377.6063
VS3125
Figure 3. VOLTAGE TRANSLATION
Figure 4. VOH CHARACTERISTICS
5
4
3
2
1
0
0
VCC = 4.3V
VOH
4.5
4.0
3.5
3.0
2.5
2.0
1
2
Vin (V)
3
4
5
4.5
4.75
5.0
5.25
5.5
TA = 85°C
TA = 25°C
TA = - 40°C
Vout
(V)
Output Voltage
(V)
VCC – Supply Voltage (V)
Figure 5. Voltage Translation. Application
V
CC
= 5V
1N4148
or equivalent
10K
V
CC
5V
DEVICE
I/O
VS3125
I/O
3.3V
DEVICE
/E
2001-04-12
Vaishali Semiconductor
Page 4
www.vaishali.com
747 Camden Avenue, Suite C Campbell CA 95008
MDSS-0011-01
Ph. 408.377.6060
Fax 408.377.6063
VS3125
Table 8. Switching Characteristics Over Operating Range
T
A
= -40 C to +85 C, V
CC
= 5V + 10%
C
LOAD
= 50pF, R
LOAD
= 500Ω unless otherwise stated.
o
o
Symbol
t
PLH
, t
PHL
t
PZH
, t
PZL
t
PLZ
, t
PHZ
Description
(1)
Min
-
1.5
1.5
(3)
Max
0.25
6.5
5.5
Units
ns
ns
ns
Data Propagation Delay
(2,3)
through the switch
Switch Turn-on Delay, /xOE to xA or xY
Switch Turn-off Delay
(3)
,
/xOE to xA or xY
Notes:
1.
2.
See test circuits and waveforms.
This parameter is the calculated theoretical RC time constant of ON-state resistance of the switch and the
specified load capacitance when driven by an ideal voltage source (zero source impedance). This time-constant is
of the order of 0.25ns for VS3125. Since this time-constant is much smaller than rise/fall times of typical driving
signals, it adds very little propagation delay to the system.
This parameter is guaranteed, but not production tested.
3.
Figure 6. AC Test Circuit and Switching Waveforms
AC Test Circuit
S
1
7V
Load Switch Position
TEST
t
PLH
, t
PHL
t
PLZ
, t
PZL
S1
Open
Closed
Open
Pulse
Generator
50
Ω
V
IN
DUT
V
OUT
500Ω
R
L
450Ω
t
PHZ
, t
PZH
Input Conditions
50Ω=Coax to
Oscilloscope
C
L
1. Input voltage = 0 V to 3.0 V
2. t
r
= t
f
= 2.5ns (10% to 90%)
2001-04-12
Vaishali Semiconductor
Page 5
www.vaishali.com
747 Camden Avenue, Suite C Campbell CA 95008
MDSS-0011-01
Ph. 408.377.6060
Fax 408.377.6063
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