SP486CT-L Datasheet, PDF (6/9 Pages) Exar Corporation – Quad RS-485/RS-422 Line Drivers

A
V_OD
B
R
R
V_OC
Figure 1. Driver DC Test Load
Test Circuits
Figure 2. Driver Timing Test
OUTPUT
UNDER TEST
S1
500 ohms
VCC
S2
CL
Figure 3. Driver Timing Test Load
+3V
DI
0V
B
A
f =1MHz; t_R <10ns, t_F <10ns
1.5V
t_PLH
t_PHL
V_O ^1/2VO
1.5V
+V_O
– V_O
V_DIFF = V(A) - V(B)
90%
90%
10%
t_R
10%
Figure 4. Driver Propagation Delays
1/2V_O
t_F
+3V
EN
0V
5V
A, B
V_OL
V_OH
A, B
0V
f = 1MHz; t_R < 10ns ;t_F < 10ns
1.5V
t_ZL
2.3V _{Output normally LOW}
2.3V ^{Output normally HIGH}
t_ZH
1.5V
t_LZ
0.5V
0.5V
t_HZ
Figure 5. Driver Enable/Disable Timing
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP486_487_100_061611