LT1483 Linear Technology, LT1483 Datasheet - Page 5

• Manufacturer Part Number: LT1483
• Description: Ultra-Low Power RS485 Low EMI Transceiver with Shutdown
• Manufacturer: Linear Technology

SWITCHI G TI E WAVEFOR S
TEST CIRCUITS
DI
A, B
A, B
3V
DE
Figure 3. Driver/Receiver Timing Test Circuit
DI
DE
–V
V
V
3V
0V
5V
0V
3V
0V
V
0V
OH
OL
B
A
O
O
U
A
B
Figure 1. Driver DC Test Load
A
B
R
DIFF
V
W
OD
LTC1483 • F01
V
O
C
C
R
R
L1
L2
1/2 V
O
A
B
V
10%
t
r
OC
Figure 6. Driver Enable and Disable Times
1.5V
Figure 5. Driver Propagation Delays
90%
RE
t
PLH
t
1.5V
LTC1483 • F03
SKEW
W
2.3V
2.3V
t
t
ZL(SHDN)
ZH(SHDN)
t
r
15pF
10ns, t
RO
V
OUTPUT NORMALLY HIGH
OUTPUT NORMALLY LOW
DIFF
, t
, t
t
r
ZL
ZH
f
= V(A) – V(B)
10ns, t
10ns
f
10ns
RECEIVER
UNDER TEST
OUTPUT
t
PHL
OUTPUT
Figure 2. Receiver Timing Test Load
t
Figure 4. Driver Timing Test Load
t
HZ
LZ
t
f
1.5V
90%
TEST POINT
1.5V
10%
0.5V
0.5V
C
RL
t
SKEW
C
500
L
1/2 V
1k
O
S1
S2
LTC1483 • F04
S1
S2
LTC1483 • F05
LTC1483 • F06
1k
LTC1483
LTC1483 • F02
V
CC
V
CC
5