VAISH VS3V257

VS3V257 / VS3V2257
High-speed 3.3V CMOS VSwitch
Quad 2:1 Mux/Demux
Applications
•=
3.3V to 2.5V translation
•=
Logic replacement
•=
2.5V to 1.8V translation
•=
•=
Hot-Swapping
Memory bank, video, and audio
switching
General Description
The VS3V257 is a high-speed LVTTL–compatible Quad 2:1 multiplexer/demultiplexer. The VS3V257
contains four mux/demux channels, with a common path control (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 translation, 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.
Features
•=
•=
Enhanced N-FET with no DC path to VCC
or GND in normal operating signal voltage
range.
•=
Break-before-make feature
•=
Undershoot clamp diodes on all switch and
control pins
Low impedance switches connect inputs to
outputs with near-zero propagation delay:
5Ω (VS3V257) and 25Ω (VS3V2257)
•=
ESD rating >2000V (Human Body Model)
•=
or >200V (Machine Model)
•=
Latch-up current >100mA
•=
Available in 150-mil wide QSOP package
•=
Pin-compatible with 74LVC257 or
equivalent logic devices
•=
Zero added ground bounce or signal noise
Figure 1. Functional Block Diagram
Figure 2. Pin Configuration
S
QSOP
/E
YA
YB
YC
YD
I0A
I1A
I0B
I1B
I0C
I1C
I0D
I1D
S
1
16
VCC
I0A
2
15
I1A
3
14
/E
I0D
YA
I0B
4
13
I1D
I1B
5
6
12
11
YD
I0C
YB
7
10
I1C
GND
8
9
YC
(All Pins Top View)
2000-11-28
Page 1
MDSS-0001-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
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
o
o
Storage Temperature………………………………...-65 C to +150 C
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
o
TA = 25 C, f = 1 MHz, VIN = 0V, VOUT = 0V
QSOP
Pins
Operation
Control Inputs
Typ
Max
Unit
4
5
pF
VSwitch Channels
Demux
5
7
pF
(Switch OFF)
Mux
7
8
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
VCC
Power supply voltage
VIL
Low level input voltage
(Control inputs)
VIH
High level input voltage
(Control inputs)
Conditions
Operating free-air temperature
Typ
Max
3.6
Units
V
V
Vcc = 2.3 to 2.7
0.7
Vcc =2.7 to 3.6
0.8
1.7
V
Vcc = 2.3 to 2.7
Vcc = 2.7 to 3.6
TA
Min
2.3
2.0
-40
85
o
C
Note: All unused control inputs of the device must be held at Vcc or GND, to ensure proper device operation
2000-11-28
Page 2
MDSS-0001-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
VS3V257/VS3V2257
Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range
Symbol
VIK
Parameter
Clamp Voltage
Test Conditions
Control Inputs
Min
Typ
VCC = Min, IIK = -18 mA
Switch I/O
VOH
Logic High Voltage
Switch I/O
Max
Units
-1.5
V
-1.5
VIN = VCC = 3.3V, IOUT = -5µA
2.1
2.6
VIN = VCC = 2.5V, IOUT = -5µA
1.4
1.9
V
II
Input Leakage Current
Control Inputs
VCC = Max, VI = VCC or GND
1
µA
|OFF|
Power OFF Leakage
Current
Control Inputs
VCC = 0, VI or VO = VCC or GND
1
µA
VCC = Max, VI/O = VCC,
1
µA
|IOZ|
IODL
IODH
RON
Switch I/O
OFF State Leakage
Current
Switch I/O
Switch I/O Drive
Current (Logic LOW)
VCC = 3.0V, VIN = 0,
VS3V257
50
mA
VOUT = 1.5V
VS3V2257
30
mA
Switch I/O Drive
Current (Logic HIGH)
VCC = 3.0V, VIN = VCC,
VS3V257
-20
mA
VOUT = 1.5V
VS3V2257
-10
Switch ON
(1)
Resistance
/E = VCC
VCC = 3.0V, VIN = 0,
IOUT = 15mA
VS3V257
IOUT = 8mA
7
Ω
28
(2)
40
Ω
10
(3)
14
Ω
35
(3)
48
Ω
5
VS3V2257
VCC = 2.3V, VIN = 0,
mA
20
VS3V257
VS3V2257
23
(2)
Notes:
1.
2.
3.
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.
o
Typical value is specified at VCC = 3.3V and TA = 25 C.
o
Typical value is specified at VCC = 2.5V and TA = 25 C.
Table 7. Power Supply Characteristics Over Recommended Operating Free-air Temperature Range
Symbol
ICCQ
∆ICC
QCCD
Parameter
Test Conditions
Quiescent Power Supply Current
VCC = Max,
Power Supply Current per Input High
(Control Inputs)
VCC = 3.6V, VIN = 3.0V, f = 0
(2)
Dynamic Power Supply Current
(3)
(1)
S, /E = VCC or GND, f = 0
Max
Units
1
µA
300
µA
0.15
mA/MHz
VCC = 2.7V, VIN = 2.1V, f = 0
VCC = Max, Switch pins open,
Control Inputs toggling at 50% duty cycle
Notes:
1.
2.
3.
For conditions shown as Min or Max, use the appropriate values per Recommended Operating Conditions.
Per control input. All other control inputs at GND. Switch I/O pins do not contribute to ∆ICC.
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.
2000-11-28
Page 3
MDSS-0001-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
VS3V257/VS3V2257
VOLTAGE TRANSLATION
4
3
3
Vcc=3.5V
Vcc=3.6V
Vcc=3.3V
Vcc=3.3V
Vcc=3.0V
Vcc=3.0V
2
2
Vcc=2.7V
Vcc=2.5V
Vcc=2.3V
VOUT
VOUT
(V)
(V)
1
1
0
0
1
2
Figure 3. 3.3V to 2.5V Translation
2
VIN (V)
1
4
3
VIN (V)
3
Figure 4. 2.5V to 1.8V Translation
(TA + 25 °C)
(TA + 25 °C)
VOH CHARACTERISTICS
3.0
3.0
2.0
2.0
VOH
VOH
(V)
(V)
1.0
1.0
0
0
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
Supply Voltage – VCC (V)
(TA + 25 °C)
Figure 5. VOH CHARACTERISTICS
(Vcc = 3.3V nominal)
2000-11-28
3.7
2.2
2.3
2.4
2.5
2.6
2.7
Supply Voltage – VCC (V)
(TA + 25 °C)
Figure 6. VOH CHARACTERISTICS
(Vcc = 2.5V nominal)
Page 4
MDSS-0001-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
2.8
VS3V257/VS3V2257
Table 8. Switching Characteristics Over Operating Range – 3.3V Supply Voltage
o
o
TA = -40 C to +85 C, VCC = 3.3V + 0.3V
CLOAD = 30pF, RLOAD = 1kΩ unless otherwise stated.
Symbol
Description
(2,3)
(1)
Min
VS3V257
Max
(3)
tPLH, tPHL
Data Propagation Delay
tPZH, tPZL
Switch Turn-on Delay, S to YX, I0X, or I1X
0.5
5.2
tPZH, tPZL
Switch Turn-on Delay, /E to YX, I0X, or I1X
0.5
0.5
tPLZ, tPHZ
Switch Turn-off Delay
through the switch
(3)
, S or /E to YX, I0X, or I1X
VS3V2257
(3)
Min
Max
0.25
Units
1.25
ns
0.5
6.2
ns
4.8
0.5
5.8
ns
5.0
0.5
5.0
ns
Table 9. Switching Characteristics Over Operating Range – 2.5V Supply Voltage
o
o
TA = -40 C to +85 C, VCC = 2.5V + 0.2V
CLOAD = 30pF, RLOAD = 1kΩ unless otherwise stated.
Symbol
Description
(1)
Min
VS3V257
Max
(3)
VS3V2257
(3)
Min
Max
Units
tPLH, tPHL
Data Propagation Delay (2,3) through the switch
ns
tPZH, tPZL
Switch Turn-on Delay, S to YX, I0X, or I1X
ns
tPZH, tPZL
Switch Turn-on Delay, /E to YX, I0X, or I1X
ns
tPLZ, tPHZ
Switch Turn-off Delay (3), S or /E to YX, I0X, or I1X
ns
Notes:
1.
2.
3.
See test circuits and waveforms.
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.
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 Position
S1
TEST
5V
R1
VIN
Pulse
Generator
VOUT
1k Ω
DUT
2000-11-28
Open
tPLZ, tPZL
5V
tPHZ, tPZH
GND
RL
950Ω
50Ω
S1
tPLH, tPHL
CL
Input Conditions
50Ω=Coax to
Oscilloscope
Input voltage = 0 V to 3.0 V
tr = tf = 2.5ns (10% to 90%)
Page 5
MDSS-0001-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
VS3V257/VS3V2257
Switching Waveforms
3.0 V
Input
1.5 V
0V
tPLH
tPHL
VOH
Switch Output
1.2 V
VOL
Propagation Delay
3.0 V
1.5 V
Control Input
0V
tPZH
tPHZ
VOH
0.15V
Switch Output
(Switch Input = 3.0 V)
1.2 V
0V
tPLZ
tPZL
Switch Output
(Switch Input = 0 V)
0.15V
Switch ON
Switch OFF
2.5 V
1.2 V
VOL
Switch ON
Enable and Disable Times
Ordering Information
Part Number
VS3V257Q
VS3V257QX
VS3V2257Q
VS3V2257QX
2000-11-28
Marking
VS3V257Q
VS3V257Q
VS3V2257Q
VS3V2257Q
Shipping/Packaging
Tubes
Tape & Reel
Tubes
Tape & Reel
No. of Pins
16
16
16
16
Package
QSOP
QSOP
QSOP
QSOP
Temperature
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Page 6
MDSS-0001-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063