Switching Waveforms
Propagation Delay
Input
Output
tPLH
tR
3V
1.5V
0V
tPHL
VOH
2.0V
1.5V
0.5V
VOL
tF
Output Skew – tSK(o)
Input
tPLHx
Ox
tSK(o)
Oy
tPLHy
3V
1.5V
tPHLx
0V
VOH
1.5V
VOL
tSK(o)
VOH
1.5V
VOL
tPHLy
tSK(o) = ⎥ tPLHy – tPLHx ⎥ or ⎥ tPHLy – tPHLx ⎥
Tests Circuits for All Outputs
VCC
Pulse
Generator
f = 125MHz
D.U.T.
50Ω
CL
15pF
PI49FCT32802
PI49FCT32803
1:5/1:7 3.3V CMOS Clock Drivers
Pulse Skew – tSK(p)
Input
tPLH
Output
tPHL
tSK(p) = ⎥ tPHL – tPLH ⎥
3V
1.5V
0V
VOH
1.5V
VOL
Package Skew – tSK(t)
Input
tPLH1
Package 1
Output
tSK(t)
Package 2
Output
tPLH2
3V
1.5V
tPHL1
0V
VOH
1.5V
VOL
tSK(t)
VOH
1.5V
VOL
tPHL2
tSK(t) = ⎥ tPLH2 – tPLH1 ⎥ or ⎥ tPHL2 – tPHL1 ⎥
08-0298
PS8704C
11/13/08
4