Datasheet

LTC485
6
485fk
For more information www.linear.com/LTC485
SWITCHING TIME WAVEFORMS
TEST CIRCUITS
V
OD
A
B
R
R
V
OC
485 F01
Figure 1. Driver DC Test Load Figure 2. Receiver Timing Test Load
Figure 3. Driver/Receiver Timing Test Circuit Figure 4. Driver Timing Test Load #2
RECEIVER
OUTPUT
C
RL
15pF
1k
S1
S2
TEST POINT
V
CC
1k
485 F02
3V
DE
A
B
DI
R
DIFF
C
L1
C
L2
RO
15pF
A
B
RE
485 F03
OUTPUT
UNDER TEST
C
L
S1
S2
V
CC
500Ω
485 F04
Figure 5. Driver Propagation Delays
DI
3V
1.5V
t
PLH
t
r
t
SKEW
1/2 V
O
V
O
80%
10%
0V
B
A
V
O
–V
O
0V
90%
1.5V
t
PLH
t
SKEW
1/2 V
O
f = 1MHz, t
r
≤ 10ns, t
f
≤ 10ns
20%
t
f
V
DIFF
= V(A) – V(B)
485 F05