Datasheet VS3V125QX, VS3V125Q Datasheet (Vaishali Semiconductor)

Applications

•= 3.3v to 2.5V translation

•= 2.5V to 1.8V translation

•= Hot Swapping

•= Bus switching

VS3V125

3.3V Quad Bus Switch with

Individual Active Low Enables

•= Clock gating

•= Logic replacement

General Description

The VS3V125 contains a set of four high-speed, low-resistance bus switches. Each bus switch is individually
controlled by LVTTL-compatible, ac tive-low control input (/xOE) . The low ON resistance of VS3V125 allows
inputs to be connected to outputs without adding propagation delay and without generating additional signal
noise.

The VS3V125 is designed for 3.3V to 2.5V, or 2.5V to 1.8V level translation, without any external
components. In addition, the high off -is olation between switch terminals in the ‘disable’ mode, and the near­zero 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 VCC or
GND in normal operating signal voltage range.

•= Low impedance bidirectional data flow

•= Pin-compatible with CBTLV3215 switch

•= Zero added ground bounce or signal noise

•= LVTTL-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

/1OE

/2OE

/3OE

/4OE

1A 2A 3A 4A

QSOP

NC

1

/1OE

2

1A

3

1Y

4

/2OE

5

2A

6

2Y

7

GND

8

All Pins, Top View

NC= No Connect

16
15
14
13
12

11

10

V

CC

/4OE
4A
4Y
/3OE
3A
3Y

9

NC

1Y 2Y 3Y 4Y

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VS3V125

Table 1. Pin Description

Name I/O Description

1A – 4A I/O Data Input or Output
1Y – 4Y I/O Data Input or Output
/1OE - /4OE I Bus Switch Enable

Table 2. Function Table

/xOE Path Function

L xA <-> xY Enable switch
H High Impedance Disable switch

Table 3. Absolute Maximum Ratings

Supply Voltage to Ground………………………….…..-0.5V to +4.6V
DC Switch Voltage VS……………………….………….-0.5V to +4.6V

DC Input Voltage VIN…………………………………...-0.5V to +4.6V
AC Input Voltage (Pulse Width < 20ns)……………….…………-3.0V
DC Output Sink Current per Switch Pin…………………...…..120mA
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.
Functional operation under absolute maximum rated conditions is not implied.

Table 4. Capacitance

TA = 25oC, f = 1MHz, VIN = 0V, V

OUT

= 0V

QSOP

Pins Typ Max Unit

Control Inputs 4 5 pF
VSwitch Channels ( Switch OFF ) 5 7 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 Parameter Conditions Min Typ Max Units

VCC Power supply voltage 2.3 3.6 V
VIL Low level input voltage

(Control inputs)

VIH High level input voltage

(Control inputs)

TA Operating free-air temperature -40 85

Note: All unused control i nputs of the device must be held at Vcc or GND, to ensure proper device operation
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Vcc = 2.3 to 2.7
Vcc =2.7 to 3.6
Vcc = 2.3 to 2.7
Vcc = 2.7 to 3.6

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0.7

0.8

1.7

2.0

V

V

o

C

VS3V125

Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range

(1)

Symbol Parameter Test Conditions Min Typ

VOH Logic High Voltage

I

I

Input Leakage

Control Inputs -1.5 VIK Clamp Voltage
Switch I/O
Switch I/O

Control Inputs VCC = Max., VI = VCC or GND 1

VCC = Min., IIK = -18mA

VIN = VCC = 3.3V, I
VIN = VCC = 2.5V, I

= -100µA

OUT

= -100µA

OUT

-1.5

2.3

1.5

Max Units

2.7

2.0

Current

| Power OFF Leakage

OFF

Current

|IOZ| OFF State Leakage

Current

I

Switch I/O Drive

ODL

Control Inputs |

VCC = 0, VI or VO = VCC or GND. 1
Switch I/O
Switch I/O VCC = Max., V

/xOE= V
VCC = 3.0V, VIN = 0, V

CC

= 0.7V 50 mA

OUT

= VCC,

I/O

1

Current (Logic LOW)

I

Switch I/O Drive

ODH

VCC = 3.0V, VIN = VCC, V

= 1.8V -50 mA

OUT

Current (Logic HIGH)

(2)

7 RON Switch ON

(3)

10

14

Resistance

(1)

VCC = 3.0V, VIN = 0, I
VCC = 2.3V, VIN = 0, I

= 15mA 5

OUT

= 8mA

OUT

Notes:

1. RON is measured by forcing specified current into the ‘output’ node of the switch with the ‘input’ node of the switch
at the specified voltage.

2. Typical value is specified at V

3. Typical value is specified at V

= 3.3V and TA = 25oC.

CC

= 2.5V and TA = 25oC.

CC

V

V

µA

µA

µA

Ω

Table 7. Power Supply Characteristics Over Recommended Operating Free-air Temperature Range

Symbol Parameter Test Conditions

I

Quiescent Power Supply Current VCC = Max.,/xOE = VCC or GND, f = 0 1

CCQ

∆ICC

Q

Dynamic Power Supply Current

CCD

Power Supply Current per Input

(2)

High

VCC = 3.6V, VIN = 3.0V, f = 0
V

= 2.7V, VIN = 2.0V, f = 0

CC

(3)

VCC = Max, Switch pins open, Control Inputs

toggling at 50% duty cycle

(1)

Max Units

µA

300

µA

0.15 mA/MHz

Notes:

1. For conditions shown as Min or Max, use the appropriate values specified under Recommended Operating
Conditions.

2. Per control input. All other control inputs at GND. Switch I/O pins do not contribute to ∆I

CC

.

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 current of the
device. This parameter is guaranteed, but not production tested.

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V

A

OUT

V

(V)

2

1

4

3

VS3V125

VOLTAGE TRANSLATION

3

Vcc=3.6V

Vcc=3.3V
Vcc=3.0V

VOUT

(V)

2

1

Vcc=2.7V
Vcc=2.5V
Vcc=2.3V

VOH

(V)

1 2 4 0

V

3

IN (V)

Figure 3. 3.3V to 2.5V Translation

(TA + 25 °C)

3.0

2.0

1.0

OH CHAR

Figure 4. 2.5V to 1.8V Translation

CTERISTICS

3.0

2.0

VOH

(V)

1.0

1

2

IN (V)

V

(TA + 25 °C)

3

0

2.9 3.1 3.3 3.6 3.73.0 3.2 3.4 3.5

Supply Voltage – VCC (V)

(T

+ 25 °C)

A

Figure 5. VOH CHARACTERISTICS
(Vcc = 3.3V nominal)

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0

2.2 2.3 2.4 2.5 2.82.72.6

Supply Voltage – VCC (V)

(T

+ 25 °C)

A

Figure 6. VOH CHARACTERISTICS
(Vcc = 2.5V nominal)

VS3V125

Table 8. Switching Characteristics Over Operating Range – 3.3V Supply Voltage

TA = -40oC to +85oC, VCC = 3.3V + 5%
C

= 30pF, R

LOAD

Symbol Description

t

, t

Data Propagation Delay

PHL

, t

Switch Turn-on Delay, /xOE to xA or xY 1.5 6.5 ns

PZL

, t

Switch Turn-off Delay

PHZ

t
t

PLH

PZH

PLZ

= 500Ω unless otherwise stated.

LOAD

(2,3)

through the switch - 0.25 ns

(3)

, /xOE to xA or xY 1.5 5.5 ns

(1)

Min

(3)

Max Units

Table 9. Switching Characteristics Over Operating Range – 2.5V Supply Voltage

TA = -40oC to +85oC, VCC = 2.5V + 0.2V
C

= 30pF, R

LOAD

Symbol Description

t

, t

Data Propagation Delay

PHL

, t

Switch Turn-on Delay, , /xOE to xA or xY ns

PZL

, t

Switch Turn-off Delay

PHZ

t
t

PLH

PZH

PLZ

= 500Ω unless otherwise stated.

LOAD

(2,3)

through the switch ns

(3)

, /xOE to xA or xY ns

(1)

Min

(3)

Max Units

Notes:

1. See test circuits and waveforms.

2. 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 VS3V125. Since this time-constant is much smaller than rise/fall times of typical driving
signals, it adds very little propagation delay to the system.

3. This parameter is guaranteed, but not production tested.

Figure 5. AC Test Circuit and Switching Waveforms

AC Test Circuit - 3.3V Supply Voltage Load Switch Position

1

R

5 V

L

50Ω=Coax to
Oscilloscope

Pulse

Generator

50

Ω

V

IN

DUT

C

V

L

OUT

500

450

S

Ω

Ω

TEST S1

t

, t

Open

PHL

, t

Closed

PZL

, t

Open

PZH

t
t

PLH

PLZ

PHZ

Input Conditions

1. Input voltage = 0 V to 3.0 V

2. t

= tf = 2.5ns (10% to 90%)

r

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VS3V125

Switching Waveforms

Input

Switch Output

tPLH tPHL

3.0 V

1.5 V
0 V

V

1.5 V

V

OH

OL

Propagation Delay

Control Input

tPHZ

tPZH

3.0 V

1.5 V
0 V

Switch Output

(Switch Input = 3.0 V)

0.3 V

Switch Output

(Switch Input = 0 V)

tPLZ

tPZL

0.3 V

Switch ON Switch OFF

Switch ON

V

OH

1.5 V
0 V

2.5 V

1.5 V
V

OL

Enable and Disable Times

Ordering Information

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

VS3V125Q VS3V125Q Tubes 16 QSOP
VS3V125QX VS3V125Q Tape & Reel 16 QSOP

-40°C to +85°C

-40°C to +85°C

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