LTC1686CS8 Просмотр технического описания (PDF) - Linear Technology
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LTC1686CS8 Datasheet PDF : 12 Pages
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LTC1686/LTC1687
PIN FUNCTIONS
DE (Pin 4): Driver Enable. DE = high enables the driver.
DE = low will force the driver output into a high impedance
state. Do not float.
D (Pin 5): Driver Input. Controls the states of the Y and Z
outputs when DE = high. Do not float.
GND (Pins 6, 7): Ground.
Y (Pin 9): Noninverting Driver Output.
Z (Pin 10): Inverting Driver Output.
B (Pin 11): Inverting Receiver Input.
A (Pin 12): Noninverting Receiver Input.
VDD (Pin 14): Positive Supply, 5V to ±5%. Bypass with
0.1µF ceramic capacitor.
FU CTIO
Transmitting
INPUTS
RE
DE
X
1
X
1
X
0
X
1
TABLES (LTC1687)
LINE
OUTPUTS
D
CONDITION
Z
Y
1
No Fault
0
1
0
No Fault
1
0
X
X
Hi- Z
Hi- Z
X
Fault
±10mA Current
Source
Receiving
INPUTS
RE
DE
0
X
0
X
0
X
0
X
1
X
A–B
≥ 300mV
≤ – 300mV
Inputs Open
Inputs Shorted Together
A = B = – 7V to 12V
X
OUTPUT
R
1
0
1
1
Hi- Z
TEST CIRCUITS
Y
R
VOD
R VOC
Z
1686/87 • F01
Figure 1. Driver DC Test Load
3V
DE
Y
D
Z
RDIFF
A
CL1
B
CL2
R
RE
15pF
Figure 3. Driver/Receiver Timing Test Circuit
1686/87 F03
6
TEST POINT
S1
RECEIVER
OUTPUT
CL
15pF
1k
S2
1k
VDD
1686/87 F02
Figure 2. Driver DC Test Load
OUTPUT
UNDER TEST
500Ω
CL
S1
VDD
S2
1686/87 F04
Figure 4. Driver Timing Test Load #2
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