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LTC1320 Datasheet(PDF) 6 Page - Linear Technology |
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LTC1320 Datasheet(HTML) 6 Page - Linear Technology |
6 / 8 page 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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Similar Description - LTC1320 |
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