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LT1331 Datasheet(PDF) 6 Page - Linear Technology |
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LT1331 Datasheet(HTML) 6 Page - Linear Technology |
6 / 8 page 6 LT1331 S APPLICATI I FOR ATIO Power Saving Operational Modes The LT1331 has both shutdown and driver disable oper- ating modes. These operating modes can optimize power consumption based upon applications needs. The shutdown control turns off all circuitry except for Low-Q RX5. RX5 operates entirely from the VL power supply, so the power consumption from VCC drops to zero. The VCC power supply may be turned off while in shutdwon, which may allow greater power savings in some systems. When RX5 detects a signal, this informa- tion can be used to wake up the system for full operation. If more than one line must be monitored, the driver disable mode provides a power efficient operating option. The driver disable mode turns off the charge pumps and RS232 drivers, but keeps all five receivers active. Power consumption in driver disable mode is 3mA from VL and less than 100µA from VCC. Mixed 5V/3V Operation When operated with VCC = 5V and VL = 3.3V supplies, the RS232 drivers meet or exceed all RS232 or V.28 commu- nication interface standards. Data rates up to 120kbaud are supported, and all standard RS232 compatible mice may be driven by the LT1331. 3V Operation VCC = 3.3V operation of the LT1331 results in lower driver output swing than with VCC = 5V. The driver output swing, when operated with VCC = 3.3V, is guaranteed to be at least –2.7V to 3.7V, with typical swing being –3.3V to 4V. This insures compatibility with all commonly used RS232 and RS562 interface circuits. Table 1 summarizes the receiver input threshold specifications for RS232 circuits from many manufacturers. Table 1. Commonly Used RS232 Interface Circuit Receiver Thresholds INPUT LOW THRESHOLD INPUT HIGH THRESHOLD MANUFACTURER PART NUMBER COMPATIBLE MIN TYP MAX MIN TYP MAX Linear Technology LT1080 0.8 1.3 – – 1.7 2.4 LT1137A 0.8 1.3 – – 1.7 2.4 LT1330 0.8 1.3 – – 1.7 2.4 LT1281 0.8 1.3 – – 1.7 2.4 All Others Texas Instruments SN75189 0.65 1.0 1.25 0.9 1.3 1.6 SN75189A 0.65 1.0 1.25 1.55 1.9 2.25 MAX232 0.8 1.2 – – 1.7 2.4 SN75C185 0.65 1.0 1.25 1.6 2.1 2.55 Maxim MAX232A 0.8 1.3 – – 1.8 2.4 MAX241 0.6 1.2 – – 1.5 2.4 Sipex SP232 0.8 1.2 – – 1.7 2.4 SP301 0.75 – 1.35 1.75 – 2.5 Motorola MC1489 0.75 – 1.25 1.0 – 1.5 MC1489A 0.75 0.8 1.25 1.75 1.95 2.25 National DS1489 0.75 1.0 1.25 1.0 1.25 1.5 DS14C89A 0.5 – 1.9 1.3 – 2.7 |
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