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PDF VS3244 Data sheet ( Hoja de datos )
| Número de pieza | VS3244 | |
| Descripción | High Speed CMOS VSwitch Dual 4-Bit Bus Switches | |
| Fabricantes | Vaishali Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de VS3244 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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VS3244 / VS32244
High Speed CMOS VSwitch
Dual 4-Bit Bus Switches
Applications
•= 5V to 3.3V translation in mixed-supply environment
•= Hot-swap interface
•= Logic replacement
•= Bus isolation
General Description
The VS3244 and VS32244 are high-speed TTL–compatible dual 4-bit bus switches. The VS3244 contains
two banks of 4-bit switches, with one common active low enable (/G) per bank. The low ON resistance of the
VS3244 allows inputs to be connected to outputs, without adding propagation delay and without generating
additional signal noise. The VS32244 has 25Ω resistors in series with the switches to reduce ground-bounce
noise and signal reflection.
The VS3244 and VS32244 bus switches are function and pinout compatible with QS3244 and CBT3244
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 VS3244 and VS32244 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 (VS3244) and 25Ω (VS32244)
•= Pin-compatible with QS3244 and CBT3244
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- Available in 150-mil wide QSOP
package
Figure 1. Functional Block Diagram
/1G
1A1
1A2
1A3
1A4
/2G
1B1 2A1
1B2 2A2
1B3 2A3
1B4 2A4
Figure 2. Pin Configuration
(All Pins Top View)
QSOP
2B1
2B2
2B3
2B4
/1G
1A1
2B4
1A2
2B3
1A3
2B2
1A4
2B1
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 /2G
18 1B1
17 2A4
16 1B2
15 2A3
14 1B3
13 2A2
12 1B4
11 2A1
A0
2001-04-12
Page 1
MDSS-0008-02
www.vishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
1 page  
VS3244/VS32244
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, /1G, /2G to A or B
0.5 5.6
tPLZ, tPHZ
Switch Turn-off Delay /1G, /2G to A or B
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
VS3244 and 1.25 ns for VS32244. 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 5. 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-0008-02
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 VS3244.PDF ] | |
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