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5962R9672201QXC Datasheet(PDF) 4 Page - Intersil Corporation |
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5962R9672201QXC Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 8 page 4 Transmitter The HS-245RH transmitters have two inputs per transmitter, either of which is low while the other is open during normal operation and both inputs are open during standby. For optimum transmitter performance, the “off” input should be open circuit rather than being pulled towards +5V, because this will reduce the “on” output data current. On the other hand, the “on” and “off” output data current will increase if the “off” input is held below its open circuit voltage. Open collector gates such as the 7401 and 7403 or 7405 Hex- Inverter are suitable for driving the HS-245RH transmitter inputs. By using 2-input gates as shown in Figure 4, an enable line can be provided so that more than one transmitter may be connected to a line for time sharing. When the enable line is low the transmitter will be disabled and will present a high impedance to the transmission line as well as requiring very little power supply current. Complementary input signals may be derived from high speed inverter gates as shown, or by using the complementary outputs of a flip-flop. When the transmitter is connected near the midpoint of a long transmission line or to a line with terminations at both ends, two transmitter sections should be paralleled with respective inputs and outputs connected together in order to drive the reduced impedance. This parallel transmitter technique can also be used to increase the data rate on long transmission lines. TABLE A. GENERAL TRANSMITTER/RECEIVER CHARACTERISTICS TRIPLE LINE TRANSMITTER PARAMETER HS-245RH UNITS COMMENTS Operating Temperature Range -55 to 125 oC “ON” Output Current 1.0 Min mA Over Full Temperature Range Power Supply Current 7.0 Max mA Per Transmitter Section Standby Current 33 Max µA Per Transmitter Section Propagation Delay 14 Max ns Over Full Temperature Range TRIPLE LINE RECEIVER PARAMETER RECEIVER TYPE LIMITS UNITS COMMENTS Operating Temperature Range HS-246RH/248RH -55 to 125 oC Power Supply ICC (VCC = +5.0V) HS-246RH/248RH 2.6 mA Per Receiver Section Propagation Delay All Receivers 30 ns Over Full Temperature Range Input Impedance and Output Circuit HS-246RH INPUT Ω OUTPUT 100 Open Collector HS-248RH Hi-Z 6K Pull-Up Resistor -5V OUT +5 GND 1/3 HS-246RH +5V GND 2K-6K FOR TTL DRIVE REQUIRED FOR HS-246RH OUT 1/3 HS-248RH -5V +5V GND IN ENABLE G1 1/3 HS-245RH G2 G3 FIGURE 4. TYPICAL DATA TRANSMISSION SYSTEM HS-245RH, HS-246RH, HS-248RH |
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