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SP301CS Datasheet(PDF) 6 Page - Sipex Corporation |
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SP301CS Datasheet(HTML) 6 Page - Sipex Corporation |
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6 / 18 page  Corporation SIGNAL PROCESSING EXCELLENCE 56 isolate an SP301/302 from ground in the power- off condition. With V DD turned on, the transistor switch is on, connecting ground (GND) for the device to the circuit ground. In a power-off condition, this transistor is switched off, thus isolating the unit from circuit ground, and thereby leaving the driver in a high impedance state. Multiple SP301/302s can be connected as shown in Figure 1b. RS-422 OPERATION The SP301 and SP302 are fully compliant RS-422 devices when operating in the RS-422 mode. Baud rate and drive capability have been balanced to provide as much versatility as pos- sible. The SP301 and SP302 are both guaran- teed for a 1Mbps data rate, supplying ±2V minimum into a 100 Ω load. Short circuit protec- tion for the RS-422 operating mode is the same as in the RS-232 mode. The driver outputs can be shorted to ground for an infinite duration, with a maximum current of ±100mA. The RS-422 receivers accept differential signals at a 1Mbps rate, and translate them to a non- inverted TTL output. The receivers are speci- fied with a ±15V differential input voltage, which means that to operate normally, the dif- ference betweeen the voltages at the inputs cannot exceed ±15V. The common mode volt- age is specified as ±7V. This identifies the midpoint of the range about which the differen- tial input must lie so that the receiver can detect a change of state. Within this ±7V range, the receivers will recognize a change in state with a ±200mV differential threshold voltage. Since the RS-232 and RS-422 inputs are shared, all receiver inputs are protected to ±30V to guard against inadvertently applying an RS-232 signal to an input that is configured for RS-422. Figure 2 shows a typical circuit for the SP301/302. In this case the SP302 is shown configured for one (1) duplex RS-422 and two (2) duplex RS-232 communication paths. CONFIGURING THE SP301/302 Figures 3, 5 and 6 show the various combina- tions of simultaneous RS-232 and RS-422 op- eration that can be achieved with the SP301. Similarly, Figures 4, 7 and 8 show the various combinations for the SP302. Each of these con- figurations are software selectable by logic level on the SELECT A and SELECT B control lines. Configuration can be changed “on-the-fly”. |
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