VS3245 Datasheet, PDF (5/6 Pages) Vaishali Semiconductor – High Speed CMOS VSwitch 8-Bit Bus Switches

VS3245/VS32245
Table 8. Switching Characteristics Over Operating Range
TA = -40^oC to +85^oC, 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 to An, Bn
0.5
5.6
tPLZ, tPHZ
Switch Turn-off Delay /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
VS3245 and 1.25 ns for VS32245. 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
V_IN
V_OUT
DUT
50Ω
C_L
Load Switch Position
S₁
7V
500Ω
450Ω
R_L
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-0007-02
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax [phone]