Vaishali VS3245, VS32245 User Manual

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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

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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

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VS3245/VS32245

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

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

/OE = V

CC

VS3245 50 mA I VS32245 mA VS3245 -50 mA I VS32245 mA VS3245 5 7 VS32245 20 28 40

-1.5

3.7 3.9 4.1

3.0 3.3 3.6

1

(1)

Max Units

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

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 = 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.

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VS3245/VS32245

Figure 3. VOLTAGE TRANSLATION

Figure 4. VOH CHARACTERISTICS

5

4.5

Vout

(V)

4

3

2

VCC = 4.3V

VOH Output Voltage (V)

4.0

3.5

3.0

2.5

0

Vin (V)

5

2.0

4.75

4.5

VCC – Supply Voltage (V)

Figure 5. Voltage Translation Application

VCC = 5V

1N4148 or equivalent

10K

VCC

5V

DEVICE

I/O

VS3245 VS32245

I/O

3.3V

DEVICE

/OE

TA = 85°C TA = 25°C

TA = - 40°C

5.5

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VS3245/VS32245

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 to An, Bn 0.5 5.6 0.5 6.6 ns

PZL

, t

Switch Turn-off Delay /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 VS3245 and 1.25 ns for VS32245. 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

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

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VS3245/VS32245 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

VS3245Q VS3245Q Tubes 20 QSOP VS3245QX VS3245Q Tape & Reel 20 QSOP VS32245Q VS32245Q Tubes 20 QSOP VS32245QX VS32245Q Tape & Reel 20 QSOP

-40°C to +85°C

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