Datasheet VS3244QX, VS3244Q, VS32244QX, VS32244Q Datasheet (Vaishali Semiconductor)

VS3244 / VS32244

A

0

/

CC

5 6

/

High Speed CMOS VSwitch

Dual 4-Bit Bus Switches

Applications

•= 5V to 3.3V translation in mixed-supply environment

•= Hot-swap interface

General Description

The VS3244 and VS32244 are high-speed TT L–compatible dual 4-bit bus switches. The VS3244 contains
two banks of 4-bit switches, with one com mon active low enable (/G) per bank. The low ON resistance of the
VS3244 allows inputs to be connected to outputs, without adding propagation delay and without generating
additional signal noise. The VS32244 has 25Ω resistors in series with the switches to r educe gr ound-bounc e
noise and signal reflection.

The VS3244 and VS32244 bus switches are function and pinout compatible with QS3244 and CBT3244
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 VS3244 and VS32244 ideal interface elements for hot-swap
applications.

•= Logic replacement

•= Bus isolation

/1G

Features

•= Enhanced N-FET with no DC path to VCC
or GND in normal operating signal voltage
range.

•= Low impedance bidirectional data flow:
5Ω (VS3244) and 25Ω (VS32244)

•= Pin-compatible with QS3244 and CBT3244
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- Available in 150-mil wide QSOP

package

Figure 1. Functional Block Diagram Figure 2. Pin Configuration

(All Pins Top View)

/1G

1A1

2B4

1A2
2B3
1A3
2B2

1A4

2B1

GND

1
2

3
4

7
8
9

10

1A2
1A3

1A4

2G

1B1

1B4

2A2
2A3

2A4

2B1

2B4

QSOP

20
19
18

17
16

14
13

12
11

15

V

2G
1B1
2A4
1B2

2A3
1B3

2A2
1B4

2A1

2001-04-12 Page 1 MDSS-0008-02

Vaishali Semic onductor  747 Camden Avenue, Suite C  Campbell  CA 95008  Ph. 408.377.6060  Fax [phone]

www.vishali.com

VS3244/VS32244

Table 1. Pin Description

Name I/O Description

1A1 – 1A4
2A1 – 2A4
/1G, /2G I Enable Input
1B1 – 1B4
2B1 – 2B4

I/O Data Input or Output

I/O Data Output or Input

Table 2. Function Table ( Each 4-bit bus switch)

Input Path Function

/nG
H Hi Impedance Disable all switches
L Switch Closed A port = B port

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

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-0008-02

www.vaishali.com

Vaishali Semic onductor  747 Camden Avenue, Suite C  Campbell  CA 95008  Ph. 408.377.6060  Fax [phone]

VS3244/VS32244

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

Symbol Parameter Test Conditions Min Typ

Control Input -1.5 VIK Clamp Voltage
Switch I/O

VOH Logic High Voltage Switch I/O

I

I

Input Leakage

Control Input VCC = Max, VI = VCC or GND 1

Current

| Power OFF Leakage

OFF

Current

|IOZ| OFF State Leakage

Control Input |
Switch I/O

Switch I/O VCC = Max, V

Current

Switch I/O Drive

ODL

Current (Logic LOW)

Switch I/O Drive

ODH

Current (Logic HIGH)

RON Switch ON

Resistance

(2)

VCC = Min, VIN = 0,

= 0.4V

V

OUT

VCC = Min, VIN = VCC,

= 2.4V

V

OUT

= Min, VIN = 0,

V

CC

= 30mA

I

OUT

VCC = Min, IIK = -18 mA

VIN = VCC = 5V, I

OUT

= -5µA

VCC = 4.3V, VN = 5V,

= -5µA

I

OUT

V

= 0,

CC

or VO = VCC or GND

V

I

= VCC,

I/O

/1G, /2G = V

CC

VS3244 50 mA I
VS32244 mA
VS3244 -50 mA I
VS32244 mA
VS3244 5 7
VS32244 20 28 40

-1.5

3.7 3.9 4.1

3.0 3.3 3.6

1

1

(1)

Max Units

Notes:

1. Typical values are specifi ed at V

2. R

is measured by forcing specified current into the ‘ out put’ 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, /1G, /2G = 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 contribut e to ∆ICC.

3. This parameter represents the average DC current resulting from the switching of internal nodes of t he devi ce 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 producti on t ested.

2001-04-12 Page 3 MDSS-0008-02

www.vaishali.com

Vaishali Semic onductor  747 Camden Avenue, Suite C  Campbell  CA 95008  Ph. 408.377.6060  Fax [phone]

VS3244/VS32244

Figure 3. VOLTAGE TRANSLATION

Figure 4. VOH CHARACTERISTICS

5

4.5

VOH
Output Voltage
(V)

4.0

3.5

Vout
(V)

4

3

VCC = 4.3V

2

3.0

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

Figure 5. Voltage Translation Application

VCC = 5V

1N4148
or equivalent

10K

VCC

5V

DEVICE

I/O

VS3244
VS32244

I/O

3.3V

DEVICE

/1G, /2G

TA = 85°C
TA = 25°C

TA = - 40°C

5.5

2001-04-12 Page 4 MDSS-0008-02

www.vaishali.com

Vaishali Semic onductor  747 Camden Avenue, Suite C  Campbell  CA 95008  Ph. 408.377.6060  Fax [phone]

VS3244/VS32244

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, /1G, /2G to A or B 0.5 5.6 0.5 6.6 ns

PZL

, t

Switch Turn-off Delay /1G, /2G to A or B 0.5 4.5 0.5 4.5 ns

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-stat e resistance of the switch and the specified load
capacitance when driven by an ideal voltage sourc e (zero source impedance). This time-constant is on the order of 0.25 ns for
VS3244 and 1.25 ns for VS32244. S i nce this time-cons tant is much smaller than rise/fall t i mes of typical driving si gnal s, 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)

VS3245

(3)

Min

Max

VS32245

(3)

Min

Max Units

Figure 5. AC Test Circuit and Switching Waveforms

AC Test Circuit Load Switch

Pulse

Generator

50

Ω

V

IN

DUT

C

V

L

OUT

500

450

S

1

7 V

Ω

R

L

Ω

50Ω=Coax to
Oscilloscope

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

2001-04-12 Page 5 MDSS-0008-02

www.vaishali.com

Vaishali Semic onductor  747 Camden Avenue, Suite C  Campbell  CA 95008  Ph. 408.377.6060  Fax [phone]

VS3244/VS32244
Switching Waveforms

3.0 V

Input

Switch Output

Control Input

tPLH tPHL

Propagation Delay

tPHZ

tPZH

1.5 V
0 V

V

1.5 V
V

3.0 V

1.5 V
0 V

OH

OL

VOH

1.5 V
0 V

3.5 V

1.5 V
V

OL

Switch Output

(Switch Input = 3.0 V)

Switch Output

(Switch Input = 0 V)

0.3 V

tPLZ

0.3 V

Switch ON Switch OFF

tPZL

Switch ON

Enable and Disable Times

Ordering Information

Part Number Marking Shipping/Packaging No. of Pins Package Temperature

VS3244Q VS3244Q Tubes 20 QSOP
VS3244QX VS3244Q Tape & Reel 20 QSOP
VS32244Q VS32244Q Tubes 20 QSOP
VS32244QX VS32244Q Tape & Reel 20 QSOP

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

2001-04-12 Page 6 MDSS-0008-02

www.vaishali.com

Vaishali Semic onductor  747 Camden Avenue, Suite C  Campbell  CA 95008  Ph. 408.377.6060  Fax [phone]