SWITCHING WAVEFORMS
f ≥1MHz; tR ≤10ns; tF ≤10ns
1.5V
+3V
0V
B
1.5V
DRIVER INPUT
tPLH
tPHL
1/2VO
1/2VO
DRIVER
OUTPUT
VO
A
tDPLH
tDPHL
+
VO
DIFFERENTIAL
OUTPUT
0V
–
VO
VA –VB
tF
tR
tSKEW= |tDPLH-tDPHL
|
Figure 6. Driver Propagation Delays
f = 1MHz; t < 10ns; t < 10ns
R
F
+3V
DE
1.5V
1.5V
0V
t
t
LZ
ZL
5V
2.3V
A,B
Output normally LOW
Output normally HIGH
0.5V
0.5V
V
OL
V
OH
A,B
2.3V
0V
t
t
HZ
ZH
Figure 7. Driver Enable and Disable Times
f = 1MHz; t
1.5V
; t
R ≤10ns F ≤ 10ns
+
–
VOD2
VOD2
0V
0V
A – B
INPUT
VOH
VOL
1.5V
RECEIVER OUT
OUTPUT
tPHL
tPLH
Figure 8. Receiver Propagation Delays
+3V
1.5V
1.5V
RE
f = 1MHz; tR ≤ 10ns; tF ≤ 10ns
tZL
0V
tLZ
5V
1.5V
RECEIVER OUT
Output normally LOW
Output normally HIGH
0.5V
0.5V
V
IL
V
IH
RECEIVER OUT
1.5V
tZH
0V
tHZ
Figure 9. Receiver Enable and Disable Times
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP485R_ꢀ00_072309
5
EXAR [ EXAR CORPORATION ]
