Page 1
VS3345 / VS32345
CC
3
8
5 6
9
A0A1A
A3A
A
A
A7/
High Speed CMOS VSwitch
8-Bit Bus Switches with
Active High & Low Enables
Applications
•= 5V to 3.3V translation in mixed-supply environment
•= Hot-swap interface
General Description
The VS3345 and VS32345 are high-speed TTL–compatible 8-bit bus switches. The VS3345 contains eight high-speed
bus switches, with common active low (/OE) and active high (OE) enables. The low ON resistance of the VS3345
allows inputs to be connected to outputs, without adding propagation delay and without generating additional signal
noise. The VS32345 has 25Ω resistors in series with the switches to reduce ground-bounce noise and signal reflection.
The VS3345 and VS32345 bus switches switches enable 5V to 3.3V translation when used with a diode in the power
supply line. In addition, the high off-isolation in the ‘disable’ mode makes VS3345 and VS32345 ideal interface
elements for hot-swap applications.
•= Logic replacement
•= Bus isolation
Features
•= Enhanced N-FET with no DC path to VCC
or GND in normal operating signal voltage
range.
•= Low impedance bidirectional data flow:
5Ω (VS3345) and 25Ω (VS32345)
•= Near-zero propagation delay
•= Zero added ground bounce or signal noise
•= TTL-compatible control signals
•= 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
(All Pins Top View)
A0
A1 A2 A3 A4 A5 A6 A7
QSOP
OE
/OE
B2
B3 B4 B5 B6
OE
1
2
4
2
4
5
7
6
B7B0 B1
GND
10
20
19
18
17
16
15
14
13
12
11
V
OE
B0
B1
B2
B3
B4
B5
B6
B7
2001-04-12 Page 1 MDSS-0010-01
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
www.vaishali.com
Page 2
VS3345/VS32345
Table 1. Pin Description
Name I/O Description
A0 - A7 I/O Data Input or Output
/OE I Active Low Enable Input
OE I Active High Enable Input
B0 – B7 I/O Data Output or Input
Table 2. Function Table
Input Path Function
/OE OE
H X Hi Impedance Disable all switches
X L Hi Impedance Disable all switches
L H An <-> Bn A
Note: X = Don’t care
= Bn
n
Table 3. Absolute Maximum Ratings
Supply Voltage to Ground………………………….…..-0.5V to +7.0V
DC Switch Voltage VS……………………….………….-0.5V to +7.0V
DC Input Voltage VIN………………………………… ...-0.5V to +7.0V
AC Input Voltage (Pulse Width < 20ns)……………….…………-3.0V
DC Output Sink Current per Switch Pin…………………...…..120 mA
Maximum Power Dissipation…………………………….…..0.5 Watts
Storage Temperature………………………………...-65oC to +150oC
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. Correct functional operation whiled operating in the absolute maximum rated conditions
is not implied.
Table 4. Capacitance
TA = 25oC, f = 1 MHz, VIN = 0V, V
OUT
= 0V
QSOP
Pins Typ Max Unit
Control Inputs 4 5 pF
VSwitch Channels
(Switch OFF)
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.
2001-04-12 Page 2 MDSS-0010-01
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
5
7
pF
www.vaishali.com
Page 3
VS3345/VS32345
Table 5. Recommended Operating Conditions
Symbol Parameter Conditions Min Typ Max Units
VCC Power supply voltage 4.5 5.5 V
VIL Low level input voltage -0.5 0.8 V
VIH High level input voltage 2.0 5.5 V
TA Operating free-air temperature -40 85
o
C
Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range
(1)
Symbol Parameter Test Conditions Min Typ
Control Input -1.5 VIK Clamp Voltage
Switch I/O
I
I
Input Leakage
Control Input VCC = Max, VI = VCC or GND 1
VCC = Min, IIK = -18 mA
VIN = VCC = 5V, I
V
= 4.3V, VIN = 5V,
CC
= -5µA
I
OUT
OUT
= -5µA
-1.5
3.7 3.9 4.1 VOH Logic High Voltage Switch I/O
3.0 3.3 3.6
Max Units
Current
| Power OFF Leakage
OFF
Current
|IOZ| OFF State Leakage
Current
Switch I/O Drive
ODL
Current (Logic LOW)
Switch I/O Drive
ODH
Current (Logic HIGH)
RON Switch ON
Resistance
(2)
Control Input |
Switch I/O
VCC = 0,
VI or VO = VCC or GND
Switch I/O VCC = Max, V
/OE = VCC or OE = GND
VCC = Min, VIN = 0,
V
= 0.4V
OUT
VCC = Min, VIN = VCC,
V
= 2.4V
OUT
= Min, VIN = 0,
V
CC
= 30mA
I
OUT
1
= VCC,
I/O
1
VS3345 50 mA I
VS32345 mA
VS3345 -50 mA I
VS32345 mA
VS3345 5 7
VS32345 20 28 40
Notes:
1. Typical values are specifi ed at V
2 R
is measured by forcing specified current into the ‘output ’ node of the switch with the ‘input’ node of the switch at the the
ON
specified voltage
= 5.0V and TA = 25oC.
CC
V
V
µA
µA
µA
Ω
Ω
Table 7. Power Supply Characteristics Over Recommended Operating Free-air Temperature Range
Symbol Parameter Test Conditions
I
Quiescent Power Supply Current VCC = Max, /OE, OE = VCC or GND, f = 0 1
CCQ
∆ICC
Q
Dynamic Power Supply Current
CCD
Power Supply Current per Input High
(Control Input)
(2)
= Max, VIN = 3.4V, f = 0 1.5 mA
V
CC
(3)
VCC = Max, Switch pins open,
Control Inputs toggling at 50% duty cycle
(1)
Max Units
µA
0.25 mA/MHz
Notes:
1. For conditions shown as Min or Max, use the appropriate values per Recommended Operating Conditions.
2. Per TTL-driven control input. All other control inputs at GND. Switch I /O pins do not contribute to ∆ICC.
3. 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 c urrent of the device. This paramete r
is guaranteed, but not producti on t ested.
2001-04-12 Page 3 MDSS-0010-01
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
www.vaishali.com
Page 4
VS3345/VS32345
Figure 3. VOLTAGE TRANSLATION
Figure 4. VOH CHARACTERISTICS
Vout
(V)
5
4
3
2
VCC = 4.3V
VOH
Output Voltage
(V)
4.5
4.0
3.5
3.0
TA = 85°C
TA = 25°C
TA = - 40°C
1
2.5
0
0
Vin (V)
3 2 1
4 5
2.0
4.75 5.25
4.5
VCC – Supply Voltage (V)
5.0
5.5
Figure 5. Voltage Translation Application
VCC = 5V
1N4148
or equivalent
10k
VCC
5V
DEVICE
10k
I/O
VS3345
VS32345
OE
I/O
3.3V
DEVICE
/OE
2001-04-12 Page 4 MDSS-0010-01
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
www.vaishali.com
Page 5
VS3345/VS32345
Table 8. Switching Characteristics Over Operating Range
TA = -40oC to +85oC, VCC = 5.0V + 10%
C
= 50pF, R
LOAD
Symbol
t
, t
Data Propagation Delay
PHL
, t
Switch Turn-on Delay: /OE, OE to An, Bn 0.5 5.6 0.5 6.6 ns
PZL
, t
Switch Turn-off Delay: /OE, OE to An, B
PHZ
t
t
PLH
PZH
PLZ
Notes:
1. See test circuit s and waveforms.
2. This parameter is the c al culated theoretical RC time constant of ON-state resistance of the switch and the specif i ed l oad
capacitance when driven by an ideal voltage sourc e (zero source impedance). This time-constant is on the order of 0. 25 ns for
VS3345 and 1.25 ns for VS32345. S i nce this time-constant is much smaller t han ri se/fall times of t ypical driving signals, it adds
very little propagation delay to the system.
3. This parameter is guaranteed, but not production tested.
= 500Ω unless otherwise stated.
LOAD
Description
(2,3)
through the switch 0.25 1.25 ns
(1)
0.5 4.5 0.5 4.5 ns
n
VS3245
(3)
Min
Max
VS32245
(3)
Min
Max Units
Figure 6. AC Test Circuit and Switching Waveforms
AC Test Circuit Load Switch
S
1
7 V
Ω
Pulse
Generator
50
Ω
V
IN
DUT
C
V
OUT
L
500
450
Ω
R
L
Ω=
50
Coax to
Oscilloscope
2001-04-12 Page 5 MDSS-0010-01
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
www.vaishali.com
t
PLH
t
PLZ
t
PHZ
Input Conditions
Input voltage = 0 V to 3.0 V
t
= tf = 2.5ns (10% to 90%)
r
Position
TEST S1
, t
Open
PHL
, t
Closed
PZL
, t
Open
PZH
Page 6
VS3345/VS32345
Switching Waveforms
3.0 V
Input
tPLH tPHL
Switch Output
Propagation Delay
1.5 V
0 V
V
OH
1.5 V
V
OL
Control Input
Switch Output
(Switch Input = 3.0 V)
Switch Output
(Switch Input = 0 V)
Ordering Information
tPHZ
0.3 V
tPLZ
0.3 V
Switch ON Switch OFF
Enable and Disable Times
tPZH
tPZL
3.0 V
1.5 V
3.5 V
1.5 V
Switch ON
0 V
VOH
1.5 V
0 V
V
OL
Part Number No. of Pins Package Temperature
VS3345Q 20 QSOP
VS32345Q 20 QSOP
2001-04-12 Page 6 MDSS-0010-01
www.vaishali.com
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
-40°C to +85°C
-40°C to +85°C
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