Rainbow Electronics MAX3469 - Manual (Page 10)

MAX3465–MAX3469
+5V, Fail-Safe, 40Mbps, Profibus RS-485/
RS-422 Transceivers
10 ______________________________________________________________________________________
Y
Z
V OD
R
R
V OC
Figure 5. Driver DC Test Load
DI
DE
3V
Y
V ID C
L
R DIFF
Z
Figure 6. Driver Timing Test Circuit
DI
3V
0V
Z
Y
V O
0V
-V O
V O
1.5V
1/2 V O
1/2 V O
t PLH
t F t R
t PHL
10%
90% 90%
1.5V
10%
V DIFF = V (Y) - V (Z)
t SKEW = | t PLH - t PHL |
V DIFF
f = 1MHz, t R
≤ 3ns, t
F
≤ 3ns
Figure 7. Driver Propagation Delays
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
Y, Z
V OL
Y, Z
0V
1.5V 1.5V
V OL + 0.5V
V OH - 0.5V
50%
50%
t ZL(SHDN) , t ZL
t LZ
t ZH(SHDN) , t ZH t HZ
DE
Figure 9. Driver Enable and Disable Times
V OH
V OL
A
B
1V
-1V
1.5V 1.5V
OUTPUT
INPUT
RO
t PLH t PHL
f = 1MHz, t R
≤ 3ns, t
F
≤ 3ns
Figure 10. Receiver Propagation Delays
3V
0V
V CC
RO
RO
0V
1.5V
1.5V
RE
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
1.5V 1.5V
V OL + 0.5V
V OH - 0.5V
t ZL(SHDN) , t ZL t LZ
t ZH(SHDN) , t ZH t HZ
Figure 11. Receiver Enable and Disable Times
S1
S2
OUTPUT
UNDER TEST
V
CC
C L
R
L
Figure 8. Enable/Disable Timing Test Load