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PDF VS3345Q Data sheet ( Hoja de datos )
| Número de pieza | VS3345Q | |
| Descripción | High Speed CMOS VSwitch 8-Bit Bus Switches with Active High & Low Enables | |
| Fabricantes | Vaishali Semiconductor | |
| Logotipo |  |
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VS3345 / VS32345
High Speed CMOS VSwitch
8-Bit Bus Switches with
Active High & Low Enables
Applications
•= 5V to 3.3V translation in mixed-supply environment
•= Hot-swap interface
•= Logic replacement
•= Bus isolation
General Description
The VS3345 and VS32345 are high-speed TTL–compatible 8-bit bus switches. The VS3345 contains eight high-speed
bus switches, with common active low (/OE) and active high (OE) enables. The low ON resistance of the VS3345
allows inputs to be connected to outputs, without adding propagation delay and without generating additional signal
noise. The VS32345 has 25Ω resistors in series with the switches to reduce ground-bounce noise and signal reflection.
The VS3345 and VS32345 bus switches switches 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 VS3345 and VS32345 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 (VS3345) and 25Ω (VS32345)
•= 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 QSOP package
Figure 1. Functional Block Diagram
Figure 2. Pin Configuration
(All Pins Top View)
OE
/OE
A0 A1 A2 A3 A4 A5 A6 A7
B0 B1 B2 B3 B4 B5 B6 B7
QSOP
OE
A0
A1
A2
A3
A4
A5
A6
A7
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 /OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
2001-04-12
Page 1
MDSS-0010-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
1 page  
VS3345/VS32345
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: /OE, OE to An, Bn
0.5 5.6
tPLZ, tPHZ
Switch Turn-off Delay: /OE, OE 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
VS3345 and 1.25 ns for VS32345. 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-0010-01
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 VS3345Q.PDF ] | |
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