DS2119M Maxim Integrated Products, DS2119M Datasheet
DS2119M
Specifications of DS2119M
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DS2119M Summary of contents
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... The multimode operation enables the designer to implement LVD in current products while allowing the end-user SE-backward compatibility with legacy devices. If the device is connected in an LVD-only bus, the DS2119M will use LVD termination. If any SE devices are connected to the bus, the DS2119M will use SE termination. This is accomplished automatically inside the part by sensing the voltage on the SCSI bus DIFFSENS line ...
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... That indicates the mode of the bus to be SE, HVD, or LVD, respectively. The DS2119M’s DIFF_CAP pin monitors the DIFFSENS line to determine the proper operating mode of the device. The DIFFSENSE pin can also drive the SCSI DIFFSENS line (when MSTR/SLV = 1) to determine the SCSI bus-operating mode ...
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... DS2119M. The DS2119M should be placed as close as possible to the SCSI connector to minimize signal and power-trace length, thereby resulting in less input capacitance and reflections, which can degrade the bus signals. To maintain the specified regulation, a 4.7µF capacitor is required between the V ground of each DS2119M. A high frequency cap (0.1µF ceramic recommended) can also be placed on the V pin in applications that use fast rise/fall time drivers ...
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... Figure 1. DS2119M Block Diagram ...
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Figure 2. SCSI Bus Configuration ...
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... Signal Termination. Connect to SCSI bus signal lines. Heat Sink Ground. Internally connected to the mounting pad. Should be grounded. Isolation. When pulled high, the DS2119M isolates its bus pins (RxP, RxN) from the SCSI bus. Ground. Signal ground; 0V. Master/Slave. Mode-select for the noncontrolling terminator. When pulled high, MSTR enables the DIFFSENSE driver. DIFFSENSE Capacitor. Connect a 0.1µ ...
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SINGLE-ENDED CHARACTERISTICS PARAMETER SE Termination Resistance SE Voltage Reference SE Output Current Output Capacitance LOW-VOLTAGE DIFFERENTIAL CHARACTERISTICS PARAMETER Differential Mode Termination Resistance Common Mode Termination Resistance Differential Mode Bias Common Mode Bias DC CHARACTERISTICS PARAMETER Termpower Current Input Leakage High ...
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REGULATOR CHARACTERISTICS (T = 0°C to +70°C) A PARAMETER Line Regulation Load Regulation Current Limit Sink Current NOTES 3V. LINE 0.2V. LINE 3) Guaranteed by design. 4) All lines open ...
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... No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation © 2006 Maxim Integrated Products • Printed USA DS2119M ...