VAISH VS32X2245Q2

VS32X245 / VS32X2245
High Speed CMOS VSwitch
16-Bit Bus Switches
Applications
•=
5V to 3.3V translation in mixed-supply environment
•=
Logic replacement
•=
Hot-swap interface
•=
Bus isolation
General Description
The VS32X245 and VS32X2245 are high-speed TTL-compatible 16-bit bus switches in a flow-through pinout.
Each device contains two banks of 8-bit switches with a common active-LOW enable (/OEx) for each bank.
The low ON resistance of the VS32X245 allows inputs to be connected to outputs, without adding
propagation delay and without generating additional signal noise. The VS32X2245 has 25Ω resistors in series
with the switches to reduce ground-bounce noise from the driving source and signal reflection.
The VS32X245 and VS32X2245 bus switches are function and pinout compatible with QS32X245 and
QS32X2245 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 these switches ideal interface elements for hotswap applications.
Features
•=
Enhanced N-FET with no DC path to VCC
or GND in normal operating signal voltage
range.
•=
Zero added ground bounce or signal noise
•=
TTL-compatible control signals
•=
•=
Low impedance bidirectional data flow:
5Ω (VS32X245) and 25Ω (VS32X2245)
Undershoot clamp diodes on all switch and
control pins
•=
•=
Pin-compatible with QS32X245 and
QS32X2245 switches.
ESD rating >2000V (Human Body Model)
or >200V (Machine Model)
•=
Latch-up current >100mA
•=
Near-zero propagation delay
•=
Available in 150-mil wide 40 pin QSOP
package
Figure 1. Functional Block Diagram
A0 A1 A2 A3 A4 A5
Figure 2. Pin Configuration
QSOP
A6 A7
(All Pins Top View)
/OE1
B0 B1 B2 B3 B4 B5 B6 B7
A8 A9 A10 A11 A12 A13 A14 A15
/OE2
B8 B9 B10 B11 B12 B13 B14 B15
2001-04-12
NC
A0
A1
A2
A3
A4
A5
A6
A7
GND
NC
A8
A9
A10
A11
A12
A13
A14
A15
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
VCC
/OE1
B0
B1
B2
B3
B4
B5
B6
B7
VCC
/OE2
B8
B9
B10
B11
B12
B13
B14
B15
Page 1
MDSS-0013-01
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Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
VS32X245/VS32X2245
Table 1. Pin Description
Name
I/O
Description
A0 – A15
I/O
Bus A – Data Input or Output
/OE1, /OE2
I
Output enable
B0 – B15
I/O
Bus B – Data Output or Input
Table 2. Function Table
/OE1
/OE2
A0 - A7
A8 – A15
Function
H
H
Hi - Z
Hi - Z
Disconnect
L
H
B0 – B7
Hi - Z
Connect
H
L
Hi - Z
B8 – B15
Connect
L
L
B0 – B7
B8 – B15
Connect
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…………………………….…..0.92 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
Typ
Max
Unit
Control Inputs
4
5
pF
VSwitch Channels
5
7
pF
(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.
2001-04-12
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MDSS-0013-01
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Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
VS32X245/VS32X2245
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
VIK
Parameter
Clamp Voltage
Test Conditions
Control Input
Min
Typ
(1)
VCC = Min, IIK = -18 mA
Switch I/O
VOH
Logic High Voltage
Max
Units
-1.5
V
-1.5
Switch I/O
VIN = VCC = 5V, IOUT = -5µA
3.7
3.9
4.1
VCC = 4.3V, VIN = 5V,
3.0
3.3
3.6
V
IOUT = -5µA
|II|
Input Leakage
Current
Control Input
VCC = Max, VI = VCC or GND
1
µA
|OFF|
Power OFF Leakage
Current
Control Input
VCC = 0,
1
µA
Switch I/O
VI or VO = VCC or GND
OFF State Leakage
Current
Switch I/O
VCC = Max, VI/O = VCC,
1
µA
Switch I/O Drive
Current (Logic LOW)
VCC = Min, VIN = 0,
VS32X245
VOUT = 0.4V
VS32X2245
Switch I/O Drive
Current (Logic HIGH)
VCC = Min, VIN = VCC,
VS32X245
VOUT = 2.4V
VS32X2245
VCC = Min, VIN = 0,
VS32X245
IOUT = 30mA
VS32X2245
|IOZ|
IODL
IODH
RON
Switch ON
(2)
Resistance
/OE = VCC
50
mA
mA
-50
mA
mA
20
5
7
Ω
28
40
Ω
Notes:
1.
2.
Typical values are specified at VCC = 5.0V and TA = 25oC.
RON is measured by forcing specified current into the ‘output’ node of the switch with the ‘input’ node of the switch at the the
specified voltage
Table 7. Power Supply Characteristics Over Recommended Operating Free-air Temperature Range
Symbol
Parameter
Test Conditions
Max
Units
6
µA
VCC = Max, VIN = 3.4V, f = 0
1.5
mA
VCC = Max, Switch pins open,
0.25
mA/MHz
ICCQ
Quiescent Power Supply Current
VCC = Max,
∆ICC
Power Supply Current per Input High
(2)
(Control Input)
QCCD
Dynamic Power Supply Current
(3)
(1)
/OE = VCC or GND, f = 0
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 TTL-driven 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.
2001-04-12
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MDSS-0013-01
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Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
VS32X245/VS32X2245
Figure 3. VOLTAGE TRANSLATION
5
4.5
4
4.0
Vout
(V)
Figure 4. VOH CHARACTERISTICS
VCC = 4.3V
3
2
3.5
VOH
Output Voltage
(V)
3.0
1
2.5
TA = 85°C
TA = 25°C
TA = - 40°C
2.0
0
1
0
2
3
Vin (V)
4
5.2
4.75
5.0
VCC – Supply Voltage (V)
4.5
5
5.5
Figure 5. Voltage Translation Application
VCC = 5V
1N4148
or equivalent
10K
VCC
5V
DEVICE
I/O
I/O
3.3V
DEVICE
VS32X245
VS32X2245
/OEX
2001-04-12
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MDSS-0013-01
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Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
VS32X245/VS32X2245
Table 8. Switching Characteristics Over Operating Range
o
o
TA = -40 C to +85 C, VCC = 5.0V + 10%
CLOAD = 50pF, RLOAD = 500Ω unless otherwise stated.
Symbol
Description
(2,3)
(1)
Min
through the switch
(3)
VS3245
Max
VS32245
(3)
Min
Max
0.25
1.25
ns
Units
tPLH, tPHL
Data Propagation Delay
tPZH, tPZL
Switch Turn-on Delay, /OEX to An, Bn
0.5
5.6
0.5
6.6
ns
tPLZ, tPHZ
Switch Turn-off Delay /OEX to An, Bn
0.5
4.5
0.5
4.5
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
VS32X245 and 1.25 ns for VS32X2245. 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 6. AC Test Circuit and Switching Waveforms
Load Switch Position
AC Test Circuit
TEST
S1
7V
VIN
Pulse
Generator
VOUT
RL
450Ω
2001-04-12
CL
tPLH, tPHL
Open
tPLZ, tPZL
Closed
tPHZ, tPZH
Open
500Ω
DUT
50Ω
S1
50Ω=Coax to
Oscilloscope
Input Conditions
Input voltage = 0 V to 3.0 V
tr = tf = 2.5ns (10% to 90%)
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MDSS-0013-01
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Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
VS32X245/VS32X2245
Switching Waveforms
3.0 V
Input
1.5 V
0V
tPLH
tPHL
VOH
Switch Output
1.5 V
VOL
Propagation Delay
3.0 V
1.5 V
Control Input
0V
tPZH
tPHZ
VOH
0.3 V
Switch Output
(Switch Input = 3.0 V)
1.5 V
0V
tPLZ
Switch Output
(Switch Input = 0 V)
tPZL
0.3 V
Switch ON
Switch OFF
3.5 V
1.5 V
VOL
Switch ON
Enable and Disable Times
Ordering Information
Part Number
VS32X245Q2
VS32X2245Q2
2001-04-12
No. of Pins
40
40
Package
QSOP
QSOP
Temperature
-40°C to +85°C
-40°C to +85°C
Page 6
MDSS-0013-01
www. vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063