LTC1480 Linear Technology, LTC1480 Datasheet - Page 5

• Manufacturer Part Number: LTC1480
• Description: 3.3V Ultra-Low Power RS485 Transceiver
• Manufacturer: Linear Technology

SWITCHI G TI E WAVEFOR S
FU CTIO TABLES
TEST CIRCUITS
LTC1480 Transmitting
*Shutdown mode
RE
DI
X
X
U
0
1
LTC1480
DRIVER
3V
DI
Figure 3. Driver/Receiver Timing Test Circuit
DE
INPUTS
–V
V
3V
0V
0V
B
A
O
O
DE
1
1
0
0
A
B
U
U
Figure 1. Driver DC Test Load
R
DIFF
DI
A
B
X
X
1
0
W
V
OD
LTC1480 • F01
V
B
0
1
Z
Z*
O
C
C
OUTPUTS
1/2 V
L1
L2
R
R
O
A
B
10%
t
r
A
1
0
Z
Z*
LTC1480
RECEIVER
V
1.5V
OC
90%
Figure 5. Driver Propagation Delays
RE
t
t
PLH
SKEW
LTC1480 • F03
W
f = 1MHz, t
15pF
RO
r
V
DIFF
10ns, t
= V(A) – V(B)
f
LTC1480 Receiving
*Shutdown mode
10ns
RE
0
0
0
1
RECEIVER
OUTPUT
t
PHL
UNDER TEST
INPUTS
DE
0
0
0
0
OUTPUT
Figure 2. Receiver Timing Test Load
t
Figure 4. Driver Timing Test Load
f
1.5V
TEST POINT
Inputs Open
90%
C
10%
RL
A – B
– 0.2V
0.2V
t
X
SKEW
C
500
L
1/2 V
1k
O
OUTPUTS
S1
S2
RO
1
0
1
Z*
LTC1480 • F05
LTC1480 • F04
S1
S2
1k
LTC1480 • F02
LTC1480
V
V
CC
CC
5