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MC34058FTA Datasheet(PDF) 7 Page - Motorola, Inc |
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MC34058FTA Datasheet(HTML) 7 Page - Motorola, Inc |
7 / 12 page MC34058 MC34059 7 MOTOROLA ANALOG IC DEVICE DATA Table 1. Driver Truth Table Enables Outputs Driver Data Inputs DEX REX OAX OBX H H H H L L H H L H X L H Z Z X H L Not Defined Not Defined The outputs will be in a high impedance state when: a) The Enable inputs are set according to Table 1; b) The junction temperature exceeds the trip point of the thermal shutdown circuit. When in this condition, the output’s source and sink capability are shut off, and a leakage current of less than 20 µA will flow. Disabled outputs may be taken to any voltage between –7.0 V and 12 V without damage to internal circuitry. The drivers are protected from short circuits by two methods: a) Current limiting is provided at each output, in both the source and sink direction, for shorts to any voltage within the 12 V to –7.0 V range, with respect to circuit ground. The short circuit current will flow until the fault is removed, or until the thermal shutdown activates. The current limiting circuit has a negative temperature coefficient and requires no resetting upon removal of the fault condition. b) A thermal shutdown circuit disables the outputs when the junction temperature reaches +150 °C, ± 20°C. The thermal shutdown circuit has a hysteresis of ∼ 12°C to prevent oscillations. When this circuit activates, the output stage of each driver is put into the high impedance mode, thereby shutting off the output currents. However, the remainder of the internal circuitry remains biased and the outputs will become active once again as the IC cools down. Receiver Inputs The receiver inputs and enable logic determine the state of the receiver outputs in accordance with Table 2. Each receiver input pair has a nominal differential threshold of at most 200 mV (Pin OAX with respect to OBX) and a common mode voltage range of –7.0 V and 12 V must be maintained for proper operation. A nominal hysteresis of 100 mV is typical. The receiver input characteristics are shown in Figure 8. When the inputs are in the high impedance state, they remain capable of the common mode voltage range of –7.0 V to 12 V. Receiver Outputs The receiver outputs are TTL type outputs and act in accordance with Table 2. Enable Logic Each driver output is active when the Driver Enable input is true according to Table 1. Each receiver output is active when the Receiver Enable input is true according to Table 2. The Enable inputs have a nominal threshold of 1.2 V and their voltage must be kept within the range of 0 V and VCC for proper operation. If the voltage is taken more than 0.5 V below ground or above VCC, excessive currents will flow and proper operation of the drivers will be affected. An open pin is equivalent to a logic high, but good design practices dictate that inputs should never be left open. The enable inputs are TTL compatible. Since the same pins are used for driver input and receiver output, care must be taken to make sure that DEX and REX are not both enabled. This may result in corruption of both the transmitted and received data. Table 2. Receiver Truth Table Receiver Data Inputs Enables Outputs OAX–OBX DEX REX DRX ≥ +200 mV L L H ≤ –200 mV L L L X L H Z X H L Not Defined APPLICATIONS The MC34058/9 was designed to meet EIA/TIA–422 and EIA/TIA–485 standards. EIA/TIA–422 specifies balanced point–to–point transmission with the provision for multiple receivers on the line. EIA/TIA–485 specifies balanced point–to–point transmission and allows for multiple drivers and receivers on the line. Refer to EIA/TIA documents for more details. Figure 9 shows a typical EIA/TIA–422 example. Figure 10 shows a typical EIA/TIA–485 example. Figure 9. Typical EIA/TIA–422 Application RT 100 Ω |
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