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MXL1544 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MXL1544 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 20 page +5V Multiprotocol, Software-Selectable Control Transceivers _______________________________________________________________________________________ 9 Detailed Description The MXL1544/MAX3175 are four-driver/four-receiver multiprotocol transceivers that operate from a single +5V supply and the charge pump from the MXL1543. The MXL1544/MAX3175, along with the MXL1543 and MXL1344A, form a complete software-selectable DTE or DCE interface port that supports the V.28 (RS-232), V.10/V.11 (RS-449, V.36, EIA-530, EIA-530A, X.21, RS- 423), and V.35 protocols. The MXL1544 or MAX3175 usually carries the control signals. The MXL1543 car- ries the high-speed clock and data signals, and the MXL1344A provides termination for the clock and data signals. The MXL1544/MAX3175 feature a 0.5µA no-cable mode, true fail-safe operation, and thermal shutdown circuitry. Thermal shutdown protects the drivers against excessive power dissipation. When activated, the ther- mal shutdown circuitry places the driver outputs into a high-impedance state. The MAX3175 deglitching fea- ture reduces errors in unterminated equipment. The state of the mode-select pins M0, M1, and M2 determines which serial-interface protocol is selected (Table 1). The state of the DCE/DTE input determines whether the transceivers will be configured as a DTE serial port or a DCE serial port. When the DCE/DTE input is logic HIGH, driver T3 is activated and receiver R1 is disabled. When the DCE/DTE input is logic LOW, driver T3 is disabled and receiver R1 is activated. The INVERT pin state changes the DCE/DTE functionality regarding T4 and R4 only. M0, M1, M2, INVERT, and DCE/DTE are internally pulled up to VCC to ensure logic HIGH if left unconnected. VOC R R VOD Figure 1. V.11 DC Test Circuit CL RL VO DA Figure 3. V.10/V.28 Driver Test Circuit 100pF 15pF 100pF 100 Ω D A B B A R 15pF DA R Figure 2. V.11 AC Test Circuit Figure 4. V.10/V.28 Receiver Test Circuit Test Circuits |
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