Datasheet VS3V257Q, VS3V257QX, VS3V2257QX, VS3V2257Q Datasheet (Vaishali Semiconductor)

VS3V257 / VS3V2257

A

A

A

High-speed 3.3V CMOS VSwitch

Quad 2:1 Mux/Demux

Applications

•= 3.3V to 2.5V translation

•= 2.5V to 1.8V translation

•= Hot-Swapping

General Description

The VS3V257 is a high-speed LVTTL–compatible Quad 2:1 multiplexer/demultiplexer. The VS3V257
contains four mux /demux channels, with a com mon path c ontrol (S) and active low enable (/E) . The low ON
resistance of the VS3V257 allows inputs to be connected to outputs , without adding propagation delay and
without generating additional signal noise. The VS3V2257 has 25Ω resistors in series with the switches to
reduce ground-bounce noise and signal reflection.

The VS3V257 and VS3V2257 are designed for 3.3V to 2.5V or 2.5V to 1.8V level trans lation, without any
external components. These switches also offer very high impedance between switch terminals in the
power-off or “disabled” state. This feature, combined with near-zero propagation delay in the “on” state,
makes VS3V257 and VS3V2257 ideal interface elements for hot-swapping applications.

•= Logic replacement

•= Memory bank, video, and audio

switching

Features

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

•= Low impedance switches connect inputs to
outputs with near-zero propagation delay:
5Ω (VS3V257) and 25Ω (VS3V2257)

•= Pin-compatible with 74LVC257 or
equivalent logic devices

•= Zero added ground bounce or signal noise

•= Break-before-make feature

•= 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

S

QSOP

/E

16
15
14
13
12

11

10

9

Y

Y

Y

Y

C

D

S

I0

I0

I1
I0

I1

I1
I0

I1

B
B

C

C
D

D

GND

B

1

I0

2

A

I1

3

A

Y

4

A

I0

B

5

I1

B

6

Y

B

7
8

(All Pins Top View)

V

/E

I0

I1D
Y
I0C
I1
Y

CC

D

D

C

C

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VS3V257/VS3V2257

Table 1. Pin Description

Name I/O Description

I0X, I1X I/O Data Input or Output
S I Select Input
/E I Enable Input
YA - YD I/O Data Output or Input

Table 2. Function Table

Inputs Path Function

/E S
H X Hi Impedance Disable all switches
L L IOX <-> YX Select 0
L H I1X <-> YX Select 1

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…………………...…..128 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 conditi ons 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 Operation Typ Max Unit

Control Inputs 4 5 pF
VSwitch Channels Demux 5 7 pF

(Switch OFF) Mux 7 8 pF

Note Capacitance is guaranteed, but not production tested. Total capac i tance of a path, when the switch is clos ed, i s the sum of the

switch terminal capac i tances.

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)

Vcc = 2.3 to 2.7

0.7

V

Vcc =2.7 to 3.6 0.8
VIH High level input voltage

(Control inputs)

Vcc = 2.3 to 2.7

1.7 V

Vcc = 2.7 to 3.6 2.0

TA Operating free-air temperature -40 85

o

C

Note: All unused control inputs of the device must be held at Vcc or GND, to ensure proper device operation

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VS3V257/VS3V2257

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

Symbol Parameter Test Conditions Min Typ Max Units

VOH Logic High Voltage

I

I

| Power OFF Leakage

OFF

Input Leakage Current Control Inputs VCC = Max, VI = VCC or GND 1

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

(1)

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

Control Inputs |
Switch I/O
Switch I/O VCC = Max, V

VCC = 3.0V, VIN = 0,
V

= 1.5V

OUT

VCC = 3.0V, VIN = VCC,
V

= 1.5V

OUT

VCC = 3.0V, VIN = 0,
I

= 15mA

OUT

V

= 2.3V, V

CC

I

= 8mA

OUT

VCC = Min, IIK = -18 mA

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

OUT

OUT

= -5µA
= -5µA

-1.5

2.1

2.6

1.4

VCC = 0, VI or VO = VCC or GND 1

1

/E = V

CC

= VCC,

I/O

VS3V257 50 mA I
VS3V2257 30 mA
VS3V257 -20 mA I
VS3V2257 -10 mA
VS3V257 5

(2)

VS3V2257 20 28

IN

= 0,

VS3V257 10
VS3V2257 23 35

1.9

7

(2)

40

(3)

14

(3)

48

V

V

µA
µA

µA

Ω
Ω
Ω
Ω

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

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

Symbol Parameter Test Conditions

I

Quiescent Power Supply Current VCC = Max, S, /E = VCC or GND, f = 0 1

CCQ

∆ICC

Q

Dynamic Power Supply Current

CCD

Power Supply Current per Input High

(2)

(Control Inputs)

(3)

VCC = Max, Switch pins open,

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

V

CC

VCC = 2.7V, VIN = 2.1V, f = 0

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 per Recommended Operating Conditions.

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

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V

A

VOUT

(V)

2

1

4

3

VS3V257/VS3V2257

VOLTAGE TRANSLATION

3

Vcc=3.5V

Vcc=3.6V

Vcc=3.3V

Vcc=3.3V

VOUT

(V)

2

1

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

Vcc=3.0V

Vcc=3.0V

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

0

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 3.7 3.0 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 2.8 2.7 2.6

Supply Voltage – VCC (V)

(T

+ 25 °C)

A

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

VS3V257/VS3V2257

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

TA = -40oC to +85oC, VCC = 3.3V + 0.3V
C

= 30pF, R

LOAD

Symbol

t

, t

PLH

PHL

t

, t

PZH

PZL

t

, t

PZH

PZL

t

, t

PLZ

PHZ

Data Propagation Delay
Switch Turn-on Delay, S to YX, I0X, or I1X 0.5 5.2 0.5 6.2 ns
Switch Turn-on Delay, /E to YX, I0X, or I1X 0.5 4.8 0.5 5.8 ns
Switch Turn-off Delay

= 1kΩ unless otherwise stated.

LOAD

Description

(2,3)

through the switch 0.25 1.25 ns

(3)

, S or /E to Y

(1)

, I0X, or I1X 0.5 5.0 0.5 5.0 ns

X

VS3V257

(3)

Min

Max

VS3V2257

(3)

Min

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

t

, t

PLH

PHL

t

, t

PZH

PZL

t

, t

PZH

PZL

t

, t

PLZ

PHZ

Data Propagation Delay
Switch Turn-on Delay, S to YX, I0X, or I1X ns
Switch Turn-on Delay, /E to YX, I0X, or I1X ns
Switch Turn-off Delay

= 1kΩ unless otherwise stated.

LOAD

Description

(2,3)

through the switch ns

(3)

, S or /E to Y

(1)

, I0X, or I1X ns

X

VS3V257

(3)

Min

Max

VS3V2257

(3)

Min

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
on the order of 0.25 ns for VS3V257 and 1.25 ns for VS3V2257. 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 7. AC Test Circuit and Switching Waveforms

AC Test Circuit 3.3V Supply Voltage Load Switch

S

1

Pulse

Generator

50

Ω

V

IN

DUT

C

V

L

OUT

R1

1k

950

Ω

Ω

5 V

R

L

50Ω=Coax to
Oscilloscope

t

, t

PLH

PHL

t

, t

PLZ

PZL

t

, t

PHZ

PZH

Input Conditions

Input voltage = 0 V to 3.0 V
t

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

r

TEST S1

Open

5V

GND

Position

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VS3V257/VS3V2257

Switching Waveforms

Input

tPLH tPHL

Switch Output

Propagation Delay

Control Input

tPHZ

tPZH

(Switch Input = 3.0 V)

Switch Output

tPLZ

Switch Output

(Switch Input = 0 V)

0.15V

tPZL

0.15V

Switch ON Switch OFF

3.0 V

1.5 V
0 V

V

1.2 V

V

3.0 V

1.5 V

2.5 V

1.2 V

Switch ON

OH

OL

0 V

VOH

1.2 V
0 V

V

OL

Enable and Disable Times

Ordering Information

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

VS3V257Q VS3V257Q Tubes 16 QSOP
VS3V257QX VS3V257Q Tape & Reel 16 QSOP
VS3V2257Q VS3V2257Q Tubes 16 QSOP
VS3V2257QX VS3V2257Q Tape & Reel 16 QSOP

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

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