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HI-1579PSMF Datasheet(PDF) 2 Page - Holt Integrated Circuits |
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HI-1579PSMF Datasheet(HTML) 2 Page - Holt Integrated Circuits |
2 / 10 page PIN DESCRIPTIONS FUNCTIONAL DESCRIPTION The HI-1579 family of dual data bus transceivers contains differential voltage source drivers and differential receiv- ers. It is intended for applications using a MIL-STD-1553 A/B data bus. The device produces a trapezoidal output waveform during transmission. Data input to the device’s transmitter section is from the complementary CMOS inputs TXA/B and / . The transmitter accepts Manchester II bi-phase data and con- verts it to differential voltages on . The transceiver outputs are either direct or transformer coupled to the MIL-STD-1553 data bus. Both coupling methods produce a nominal voltage on the bus of 7.5 volts peak to peak. TRANSMITTER TXA B BUSA/B and / The transmitter is automatically inhibited and placed in the high impedance state when both TXA/B and / are ei- ther at a logic “1” or logic “0” simultaneously. A logic “1” ap- plied to the TXINHA/B input will force the transmitter to the high impedance state, regardless of the state of TXA/B and / BUSA B TXA B TXA B. RECEIVER The receiver accepts bi-phase differential data from the MIL-STD-1553 bus through the same direct or transformer coupled interface as the transmitter. The receiver’s differ- ential input stage drives a filter and threshold comparator that produces CMOS data at the RXA/B and / output pins. When the MIL-STD-1553 bus is idle and RXENA or RXENB are high, RXA/B will be logic “0” on HI-1579 and logic “1” on HI-1581. RXA B Each set of receiver outputs can also be independently forced to the bus idle state (logic "0” on HI-1579 or logic “1” on HI-1581) by setting RXENA or RXENB low. A direct coupled interface (see Figure 2) uses a 1:2.5 ratio isolation transformer and two 55 ohm isolation resistors between the transformer and the bus. In a transformer coupled interface (see Figure 3), the transceiver is also connected to a 1:2.5 isolation transformer which in turn is connected to a 1:1.4 coupling transformer. The transformer coupled method also requires two coupling resistors equal to 75% of the bus characteristic impedance (Zo) between the coupling transformer and the bus. MIL-STD-1553 BUS INTERFACE PIN SYMBOL FUNCTION DESCRIPTION (DIP & SOIC) 1 VDDA power supply +3.3 volt power for transceiver A 2 BUSA analog output MIL-STD-1533 bus driver A, positive signal 3 analog output MIL-STD-1553 bus driver A, negative signal 4 RXENA digital input Receiver A enable. If low, forces RXA and low 5 GNDA power supply Ground for transceiver A 6 VDDB 7 BUSB 9 RXENB 10 GNDB 11 12 RXB digital output Receiver B output, non-inverted 13 TXINHB digital input Transmit inhibit, bus B. If high BUSB, disabled 14 TXB digital input Transmitter B digital data input, non-inverted 15 digital input Transmitter B digital data input, inverted 16 digital output BUSA RXA BUSB TXB RXA power supply +3.3 volt power for transceiver B analog output MIL-STD-1533 bus driver B, positive signal 8 analog output MIL-STD-1553 bus driver B, negative signal digital input Receiver B enable. If low, forces RXB and low power supply Ground for transceiver B digital output Receiver B output, inverted Receiver A output, inverted 17 RXA digital output Receiver A output, non-inverted 18 TXINHA digital input Transmit inhibit, bus A. If high BUSA, disabled 19 TXA digital input Transmitter A digital data input, non-inverted 20 digital input Transmitter A digital data input, inverted BUSB RXB RXB BUSA TXA HI-1579, HI-1581 HOLT INTEGRATED CIRCUITS 2 |
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