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VS3245 / VS32245
High Speed CMOS VSwitch
8-Bit Bus Switches
Applications
•= 5V to 3.3V translation in mixed-supply environment
•= Hot-swap interface
General Description
The VS3245 and VS32245 are high-speed T TL–compatible 8-bit bus switches. The VS3245 contains eight
high-speed bus switches, with a comm on active low enable (/OE). The low ON resistance of the VS3245
allows inputs to be connected to outputs, without adding propagation delay and without generating additional
signal noise. The VS32245 has 25Ω resistor s in s er ies with the switches to r educ e ground- bounce noise and
signal reflection.
The VS3245 and VS32245 bus switches are function and pinout compatible with QS3245 and CBT3245
switches. They 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 VS3245 and VS32245 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 (VS3245) and 25Ω (VS32245)
•= Pin-compatible with QS3245 and CBT3245
switches.
•= 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
A0
A1 A2 A3 A4 A5 A6 A7
(All Pins Top View)
QSOP
/OE
B2
B3 B4 B5 B6
B7B0 B1
GND
NC
0
5
7
1
2
4
5
6
7
10
20
19
18
17
16
14
13
12
11
15
V
OE
B0
B1
B2
B3
B4
B5
B6
B7
2001-04-12 Page 1 MDSS-0007-02
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
VS3245/VS32245
Table 1. Pin Description
Name I/O Description
A0 - A7 I/O Data Input or Output
/OE I Enable Input
B0 – B7 I/O Data Output or Input
Table 2. Function Table
Input Path Function
/OE
H Hi Impedance Disable all switches
L An <-> Bn A
= 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 while 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.
5
7
pF
2001-04-12 Page 2 MDSS-0007-02
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