LTC1487 Просмотр технического описания (PDF) - Linear Technology
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LTC1487 Datasheet PDF : 8 Pages
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LTC1487
PIN FUNCTIONS
RO (Pin 1): Receiver Output. If the receiver output is
enabled (RE LOW), and A > B by 200mV, RO will be HIGH.
If A < B by 200mV, then RO will be LOW.
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.
DE (Pin 3): Driver Outputs Enable. A HIGH on DE enables
the driver output. A and B and the chip will function as a line
driver. A LOW input will force the driver outputs into a high
impedance state and the chip will function as a line
receiver. If RE is HIGH and DE is LOW, the part will enter
a low power (1µA) shutdown state.
DI (Pin 4): Driver Input. If the driver outputs are enabled
(DE HIGH) then a LOW on DI forces the outputs A LOW and
B HIGH. A HIGH on DI with the driver outputs enabled will
force A HIGH and B LOW.
GND (Pin 5): Ground.
A (Pin 6): Driver Output/Receiver Input.
B (Pin 7): Driver Output/Receiver Input.
VCC (Pin 8): Positive Supply. 4.75V < VCC < 5.25V.
UU
FU CTIO TABLES
LTC1487 Transmitting
INPUTS
OUTPUTS
RE
DE
DI
B
A
X
1
1
0
1
X
1
0
1
0
0
0
X
Z
Z
1
0
X
Z*
Z*
*Shutdown mode
LTC1487 Receiving
INPUTS
RE
DE
A–B
0
0
≥ 0.2V
0
0
≤ – 0.2V
0
0 Inputs Open
1
0
X
*Shutdown mode
OUTPUTS
RO
1
0
1
Z*
TEST CIRCUITS
A
R
VOD
R
B
LTC1487 • F01
VOC
Figure 1. Driver DC Test Load
3V
DE
A
DI
B
RDIFF
A
CL1
RO
B
CL2
RE
15pF
LTC1487 • F03
Figure 3. Driver/Receiver Timing Test Circuit
RECEIVER
OUTPUT
TEST POINT
S1
CRL
1k
S2
1k
VCC
LTC1487 • F02
Figure 2. Receiver Timing Test Load
OUTPUT
UNDER TEST
500Ω
CL
S1
VCC
S2
LTC1487 • F04
Figure 4. Driver Timing Test Load
sn1487 1487fs
5
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