LTC1485
U
U
U
PI FU CTIO S
DI (Pin 4): Driver Input. If the driver outputs are enabled
(DE high), then a low on DI forces the driver outputs A low
and B high. A high on DI will force A high and B low.
RO (Pin 1): Receiver Output. If the receiver output is
enabled (RE low), then if A > B by 200mV, RO will be high.
If A < B by 200mV, then RO will be low.
GND (Pin 5): Ground Connection.
RE (Pin 2): Receiver Output Enable. A low enables the
receiver output, RO. A high input forces the receiver
output into a high impedance state.
A (Pin 6): Driver Output/Receiver Input.
B (Pin 7): Driver Output/Receiver Input.
DE (Pin 3): Driver Output Enable. A high on DE enables the
driver outputs, A and B. A low input will force the driver
outputs into a high impedance state.
V
CC (Pin 8): Positive Supply. 4.75V ≤ VCC ≤ 5.25V.
TEST CIRCUITS
A
R
V
OD2
A
A
B
C
C
L1
R
DI
R
DIFF
RO
DRIVER
B
RECEIVER
V
OC
B
15pF
L2
1485 F02
1485 F01
Figure 1. Driver DC Test Load
Figure 2. Driver/Receiver Timing Test Circuit
S1
1k
S1
RECEIVER
OUTPUT
V
V
CC
CC
500Ω
OUTPUT
UNDER TEST
C
L
1k
S2
S2
C
L
1485 F04
1485 F03
Figure 4. Driver Timing Test Load
Figure 3. Receiver Timing Test Load
5
Linear [ Linear ]
