LTC1481 Linear Technology, LTC1481 Datasheet - Page 5

• Manufacturer Part Number: LTC1481
• Description: Ultra-Low Power RS485 Transceiver with Shutdown
• Manufacturer: Linear Technology

SWITCHI G TI E WAVEFOR S
TEST CIRCUITS
DI
3V
Figure 3. Driver/Receiver Timing Test Circuit
DE
A, B
A, B
DE
DI
V
V
–V
A
B
3V
0V
5V
OH
0V
U
OL
3V
0V
V
0V
B
A
O
O
Figure 1. Driver DC Test Load
R
A
B
DIFF
V
W
OD
LTC1481 • F01
C
C
L1
L2
V
R
R
O
1/2 V
A
B
O
V
OC
10%
t
r
Figure 6. Driver Enable and Disable Times
1.5V
Figure 5. Driver Propagation Delays
RE
90%
LTC1481 • F03
W
t
1.5V
t
PLH
SKEW
2.3V
2.3V
f = 1MHz, t
t
t
ZL(SHDN)
ZH(SHDN)
15pF
RO
f = 1MHz, t
r
OUTPUT NORMALLY HIGH
V
OUTPUT NORMALLY LOW
, t
DIFF
, t
10ns, t
ZL
ZH
= V(A) – V(B)
r
f
10ns, t
10ns
RECEIVER
OUTPUT
f
UNDER TEST
10ns
t
OUTPUT
PHL
Figure 2. Receiver Timing Test Load
Figure 4. Driver Timing Test Load
t
t
HZ
LZ
t
f
TEST POINT
1.5V
C
RL
90%
1.5V
0.5V
0.5V
10%
C
t
500
SKEW
L
1k
1/2 V
S1
S2
O
LTC1481 • F04
S1
S2
1k
LTC1481 • F06
LTC1481 • F05
LTC1481 • F02
LTC1481
V
V
CC
CC
5