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LTC1320 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC1320
Description  AppleTalk Transceiver
Download  8 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1320 Datasheet(HTML) 6 Page - Linear Technology

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6
LTC1320
S
APPLICATI
I FOR ATIO
Thermal Shutdown Protection
The LTC1320 includes a thermal shutdown circuit which
protects the part against prolonged shorts at the driver
outputs. If any driver output is shorted to another output
or to the power supply, the current will be initially limited
to 450mA max. The die temperature will rise to about
150
°C, at which point the thermal shutdown circuit turns
off the driver outputs. When the die cools to about 130
°C,
the outputs re-enable. If the shorted condition still exists,
the part will heat again and the cycle will repeat. When the
short is removed, the part will return to normal operation.
This oscillation occurs at about 10Hz and prevents the part
from being damaged by excessive power dissipation.
Power Shutdown
The power shutdown feature of the LTC1320 is designed
primarily for battery-powered systems. When SD (pin 4)
is forced high, the part enters shutdown mode. In shut-
down, the supply current drops from 1.2mA to 30
µA typ.
The driver outputs are three-stated and the power to the
receivers is removed. The receiver outputs are not auto-
matically three-stated in shutdown, and can toggle errone-
ously due to feedthrough from the inputs. This can be
prevented by pulling RXEN high along with SD; this will
three-state the receiver outputs and prevent the genera-
tion of spurious data.
Supply Bypassing
The LTC1320 requires that both VDD and VSS are well
bypassed; data errors can result from inadequate bypass-
ing. Bypass capacitor values of 0.1
µF to 1µF from VDD to
ground and from VSS to ground are adequate. Lead lengths
and trace lengths between the capacitors and the chip
should be short to minimize lead inductance.
S
APPLICATI
TYPICAL
Single 5V Supply
RS422 to RS562/RS562 to RS422 Converter
17
1
18
0.1
µF
5V
914
0.1
µF
DRIVER I/O
LTC1320 • TA03
16
2
15
3
13
4
12
5
11
6
10
7
8
LTC1320
100
µF
LTC1046
LT1054
*
+
8
5
+
2
4
10
µF
2
µF
3
LOGIC I/O
5V
*LTC1046 GIVES 300
µA QUIESCENT
CURRENT WHEN LTC1320 IS SHUT DOWN
LT1054 PROVIDES HIGHER OUTPUT DRIVE
1N5817
15
11
18
0.1
µF
5V
914
LTC1320 • TA04
6
10
13
8
16
2
17
12
3
7
4
1
LTC1320
0.1
µF
5
–5V
RS562 OUT
NC
NC
+
RS422 OUT
+
RS562 IN
RS422 IN
TXO
TXD+
TXD
RXI
RXO
SD
RXEN
TXDEN
RXD
RXDO
TXI
RXO
TXD
RXD+
RXI
VDD
VSS
GND


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