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PDF VS32X245Q2 Data sheet ( Hoja de datos )
| Número de pieza | VS32X245Q2 | |
| Descripción | High Speed CMOS VSwitch 16-Bit Bus Switches | |
| Fabricantes | Vaishali Semiconductor | |
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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 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 hot-
swap applications.
Features
•= Enhanced N-FET with no DC path to VCC
or GND in normal operating signal voltage
range.
•= Low impedance bidirectional data flow:
5Ω (VS32X245) and 25Ω (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)
/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
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 VCC
39 /OE1
38 B0
37 B1
36 B2
35 B3
34 B4
33 B5
32 B6
31 B7
30 VCC
29 /OE2
28 B8
27 B9
26 B10
25 B11
24 B12
23 B13
22 B14
21 B15
2001-04-12
Page 1
MDSS-0013-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
1 page  
VS32X245/VS32X2245
Table 8. Switching Characteristics Over Operating Range
TA = -40oC to +85oC, VCC = 5.0V + 10%
CLOAD = 50pF, RLOAD = 500Ω unless otherwise stated.
Symbol
tPLH, tPHL
Description (1)
Data Propagation Delay (2,3) through the switch
VS3245
Min(3) Max
0.25
tPZH, tPZL
Switch Turn-on Delay, /OEX to An, Bn
0.5 5.6
tPLZ, tPHZ
Switch Turn-off Delay /OEX to An, Bn
0.5 4.5
VS32245
Min(3) Max
1.25
0.5 6.6
0.5 4.5
Units
ns
ns
ns
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
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.
3. This parameter is guaranteed, but not production tested.
Figure 6. AC Test Circuit and Switching Waveforms
AC Test Circuit
Pulse
Generator
VIN VOUT
DUT
50Ω
CL
Load Switch Position
S1
7V
500Ω
450Ω
RL
50Ω=Coax to
Oscilloscope
TEST
tPLH, tPHL
tPLZ, tPZL
tPHZ, tPZH
S1
Open
Closed
Open
Input Conditions
Input voltage = 0 V to 3.0 V
tr = tf = 2.5ns (10% to 90%)
2001-04-12
Page 5
MDSS-0013-01
www. vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet VS32X245Q2.PDF ] | |
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