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VS32X245 / VS32X2245 High Speed CMOS VSwitch 16-Bit Bus Switches
Applications
*= *= 5V to 3.3V translation in mixed-supply environment Hot-swap interface *= *= Logic replacement 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 25 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. Low impedance bidirectional data flow: 5 (VS32X245) and 25 (VS32X2245) Pin-compatible with QS32X245 and QS32X2245 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 40 pin QSOP package
*= *= *=
Figure 1. Functional Block Diagram
A0 A1 A2 A3 A4 A5 A6 A7
Figure 2. Pin Configuration QSOP
(All Pins Top View)
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
/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 Vaishali Semiconductor
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MDSS-0013-01 Ph. 408.377.6060 Fax 408.377.6063
VS32X245/VS32X2245 Table 1. Pin Description Name
A0 - A15 /OE1, /OE2 B0 - B15 I I/O
I/O
I/O
Description
Bus A - Data Input or Output Output enable Bus B - Data Output or Input
Table 2. Function Table /OE1
H L H L
/OE2
H H L L
A0 - A7
Hi - Z B0 - B7 Hi - Z B0 - B7
A8 - A15
Hi - Z Hi - Z B8 - B15 B8 - B15
Function
Disconnect Connect Connect 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 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.
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Table 4. Capacitance
TA = 25 C, f = 1 MHz, VIN = 0V, VOUT = 0V
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QSOP Pins
Control Inputs 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.
Typ
4 5
Max
5 7
Unit
pF pF
2001-04-12 Vaishali Semiconductor
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VS32X245/VS32X2245 Table 5. Recommended Operating Conditions Symbol
VCC VIL VIH TA
Parameter
Power supply voltage Low level input voltage High level input voltage Operating free-air temperature
Conditions
Min
4.5 -0.5 2.0 -40
Typ
Max
5.5 0.8 5.5 85 V V V
o
Units
C
Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range Symbol
VIK
Parameter
Clamp Voltage Control Input Switch I/O
Test Conditions
VCC = Min, IIK = -18 mA
Min
Typ
(1)
Max
-1.5 -1.5
Units
V
VOH
Logic High Voltage
Switch I/O
VIN = VCC = 5V, IOUT = -5A VCC = 4.3V, VIN = 5V, IOUT = -5A
3.7 3.0
3.9 3.3
4.1 3.6 1 1
V
|II| |OFF|
Input Leakage Current Power OFF Leakage Current OFF State Leakage Current Switch I/O Drive Current (Logic LOW) Switch I/O Drive Current (Logic HIGH) Switch ON (2) Resistance
Control Input Control Input Switch I/O Switch I/O
VCC = Max, VI = VCC or GND VCC = 0, VI or VO = VCC or GND VCC = Max, VI/O = VCC, /OE = VCC
A A A
|IOZ|
1
IODL
VCC = Min, VIN = 0, VOUT = 0.4V VCC = Min, VIN = VCC, VOUT = 2.4V VCC = Min, VIN = 0, IOUT = 30mA
VS32X245 VS32X2245 VS32X245 VS32X2245 VS32X245 VS32X2245
50
mA mA
IODH
-50
mA mA 5 7 40
RON
20
28
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
ICCQ ICC QCCD
Parameter
Quiescent Power Supply Current Power Supply Current per Input High (2) (Control Input) Dynamic Power Supply Current
(3)
Test Conditions
VCC = Max, VCC = Max, VIN = 3.4V, f = 0 VCC = Max, Switch pins open,
(1)
Max
6 1.5 0.25
Units
A mA mA/MHz
/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. Page 3 www. vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0013-01 Ph. 408.377.6060 Fax 408.377.6063
2001-04-12 Vaishali Semiconductor
VS32X245/VS32X2245
Figure 3. VOLTAGE TRANSLATION
5 4 Vout (V) 3 2 VCC = 4.3V
Figure 4. VOH CHARACTERISTICS
4.5 TA = 85C TA = 25C TA = - 40C
4.0 3.5 VOH Output Voltage (V) 3.0
1 0 0 1 2 3 Vin (V) 4 5
2.5 2.0 4.5 5.2 4.75 5.0 VCC - Supply Voltage (V) 5.5
Figure 5. Voltage Translation Application
VCC = 5V 1N4148 or equivalent
10K
VCC
5V DEVICE
I/O VS32X245 VS32X2245 /OEX
I/O
3.3V DEVICE
2001-04-12 Vaishali Semiconductor
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VS32X245/VS32X2245
Table 8. Switching Characteristics Over Operating Range
TA = -40 C to +85 C, VCC = 5.0V + 10% CLOAD = 50pF, RLOAD = 500 unless otherwise stated.
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Symbol
tPLH, tPHL tPZH, tPZL tPLZ, tPHZ
Description
Data Propagation Delay
(2,3)
(1)
Min
0.5 0.5
(3)
VS3245 Max
0.25 5.6 4.5
VS32245 (3) Min Max
1.25 0.5 0.5 6.6 4.5
Units
ns ns ns
through the switch
Switch Turn-on Delay, /OEX to An, Bn Switch Turn-off Delay /OEX to An, Bn
Notes:
1. 2. 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.
3.
Figure 6. AC Test Circuit and Switching Waveforms
AC Test Circuit
Load Switch Position TEST
tPLH, tPHL S1 7V tPLZ, tPZL tPHZ, tPZH VIN DUT 450 VOUT 500 RL Open Closed Open
S1
Pulse Generator 50
Input Conditions
Input voltage = 0 V to 3.0 V tr = tf = 2.5ns (10% to 90%)
CL
50=Coax to Oscilloscope
2001-04-12 Vaishali Semiconductor
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MDSS-0013-01 Ph. 408.377.6060 Fax 408.377.6063
VS32X245/VS32X2245
Switching Waveforms
3.0 V Input 1.5 V 0V tPLH Switch Output tPHL VOH 1.5 V VOL
Propagation Delay
Control Input
3.0 V 1.5 V 0V tPHZ tPZH VOH 1.5 V 0V tPLZ tPZL 0.3 V Switch ON Switch OFF 3.5 V 1.5 V VOL
0.3 V Switch Output (Switch Input = 3.0 V)
Switch Output (Switch Input = 0 V)
Switch ON
Enable and Disable Times
Ordering Information
Part Number VS32X245Q2 VS32X2245Q2
No. of Pins 40 40
Package QSOP QSOP
Temperature -40C to +85C -40C to +85C
2001-04-12 Vaishali Semiconductor
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MDSS-0013-01 Ph. 408.377.6060 Fax 408.377.6063

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