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LTC1334IG-PBF Datasheet(PDF) 11 Page - Linear Dimensions Semiconductor |
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LTC1334IG-PBF Datasheet(HTML) 11 Page - Linear Dimensions Semiconductor |
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11 / 16 page  11 LTC1334 S APPLICATI I FOR ATIO Basic Theory of Operation The LTC1334 has two interface ports. Each port may be configured as a pair of single-ended RS232 transceivers or as a differential RS485 transceiver by forcing the port’s selection input to a low or high, respectively. The LTC1334 provides two RS232 drivers and two RS232 receivers or one RS485 driver and one RS485 receiver per port. All the interface drivers feature three-state outputs. Interface outputs are forced into high imped- ance when the driver is disabled, in the shutdown mode or with the power off. All the interface driver outputs are fault-protected by a current limiting and thermal shutdown circuit. The ther- mal shutdown circuit disables both the RS232 and RS485 driver outputs when the die temperature reaches 150 °C. The thermal shutdown circuit reenables the drivers when the die temperature cools to 130 °C. In RS485 mode, shutdown mode or with the power off, the input resistance of the receiver is 24k. The input resistance drops to 5k in RS232 mode. A logic low at the ON/OFF pin shuts down the device and forces all the outputs into a high impedance state. A logic high enables the device. An internal 4 µA current source to VCC pulls the ON/OFF pin high if it is left open. Figure 11. RS232/RS485 Interfaces 1 28 VCC 5V LTC1334 • F11 120 Ω 12 21 LTC1334 RX OUT 18 5V 13 10 11 9 8 14 17 16 RS485 I/O RS232 DR OUT 19 5V 20 15 VEE 5V ≥ ±5V INTO 3k Ω LOAD 5 4 27 26 24 RX OUT 6 RS232 RX IN 23 2 3 RX OUT 7 DR IN DR ENABLE DR IN DR IN 22 RS232 DR OUT RS232 RX IN VDD C1 C2 0.1 µF 0.1 µF 0.1 µF 0.1 µF 0.1 µF In RS485 mode, an internal 4 µA current source pulls the driver enable pin high if left open. The RS485 receiver has a 4 µA current source at the noninverting input. If both the RS485 receiver inputs are open, the output goes to a high state. Both the current sources are disabled in the RS232 mode. The receiver output B is inactive in RS485 mode and has a 50k pull-up resistor to provide a known output state in this mode. A loopback mode enables internal connections from driver outputs to receiver inputs for self-test when the LB pin has a low logic state. The driver outputs are not isolated from the external loads. This allows transmitter verification under the loaded condition. An internal 4 µAcurrentsource pulls the LB pin high if left open and disables the loopback configuration. RS232/RS485 Applications The LTC1334 can support both RS232 and RS485 levels with a single 5V supply as shown in Figure 11. Multiprotocol Applications The LTC1334 is well-suited for software controlled inter- face mode selection. Each port has a selection pin as shown in Figure 12. The single-ended transceivers sup- port both RS232 and EIA562 levels. The differential trans- ceivers support both RS485 and RS422. |
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