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MC145406 Dataheets PDF



Part Number MC145406
Manufacturers Philips
Logo Philips
Description EIA-232-D/V.28 driver/receiver
Datasheet MC145406 DatasheetMC145406 Datasheet (PDF)

Philips Semiconductors Linear Products Product specification EIA-232-D/V.28 driver/receiver MC145406 DESCRIPTION The MC145406 is a silicon-gate CMOS IC that combines 3 drivers and 3 receivers to fulfill the electrical specifications of standards EIA-232-D and CCITT V.28. The drivers feature true TTL input compatibility, slew-rate limited output, 300Ω power-off source impedance, and output typically switching to within 25% of the supply rails. The receivers can handle up to +25V while present.

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Philips Semiconductors Linear Products Product specification EIA-232-D/V.28 driver/receiver MC145406 DESCRIPTION The MC145406 is a silicon-gate CMOS IC that combines 3 drivers and 3 receivers to fulfill the electrical specifications of standards EIA-232-D and CCITT V.28. The drivers feature true TTL input compatibility, slew-rate limited output, 300Ω power-off source impedance, and output typically switching to within 25% of the supply rails. The receivers can handle up to +25V while presenting 3 to 7kΩ impedance. Hysteresis in the receiver aids reception of noisy signals. By combining both drivers and receivers in a single CMOS chip, the MC145406 provides efficient, low-power solutions for EIA-232-D and V.28 applications. PIN CONFIGURATION D and N Packages VDD RX1 TX1 RX2 TX2 RX3 TX3 1 2 3 4 5 6 7 8 R D R D R D 16 15 14 13 12 11 10 9 VCC DO1 DI1 DO2 DI2 DO3 DI3 GND APPLICATIONS • Modem interface • Voice/data telephone interface • Lap-top computers • UART interface FEATURES VSS NOTE: D = Driver R = Receiver • Drivers • +5 to +12V supply range • 300Ω power-off source impedance • Output current limiting • TTL compatible ORDERING INFORMATION DESCRIPTION 16-Pin Plastic Dual In-Line (DIP) Package 16-Pin Small Outline Large (SOL) Package • Maximum slew rate = 30V/µs • Receivers • +25V input voltage range over the full supply range • 3 to 7kΩ input impedance • Hysteresis on input switchpoint • General • Very low supply currents for long battery life • Operation is independent of power supply sequencing TEMPERATURE RANGE 0 to +70°C 0 to +70°C ORDER CODE MC145406N MC145406D DWG # 0406C 0171B ABSOLUTE MAXIMUM RATINGS SYMBOL VCC VDD VSS VIR Supply voltage Supply voltage Supply voltage Input voltage range RX1-3 inputs DI1-3 inputs DC current per pin PD TA TSTG θJA PARAMETER RATING -0.5 to +6.0 -0.5 to +13.5 +0.5 to -13.5 (VSS - 15) to (VDD + 15) -0.5 to (VCC + 0.5) +100 1.0 0 to +70 -65 to +150 80 105 UNITS V V V V mA W Power dissipation (package) Operating temperature range Storage temperature range Thermal impedance N package D package °C °C °C/W NOTE: This device contains protection circuitry to protect the inputs against damage due to high static voltages or electric fields; however, it is advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high impedance circuit. For proper operation, it is recommended that the voltages at the DI and DO pins be constrained to the range GND < VDI < VDD and GND < VDO < VCC. Also, the voltage at the RX pin should be constrained to +25V, and TX should be constrained to VSS < VTX1-3 < VDD. Unused inputs must always be tied to an appropriate logic voltage level (e.g., GND or VCC for DI, and VSS or VDD for RX). August 31, 1994 467 853-1430 13721 Philips Semiconductors Linear Products Product specification EIA-232-D/V.28 driver/receiver MC145406 BLOCK DIAGRAM RECEIVER 15k RX VCC VCC + DO – 5.4k VSS 1.0V VDD DRIVER HYSTERESIS VCC 1.8V 300 TX LEVEL SHIFT + – 1.4V DI VSS PIN # 1 8 16 9 2, 4, 6 SYMBOL VDD VSS VCC GND RX1, RX2, RX3 PIN DESCRIPTION Positive power supply. The most positive power supply pin, which is typically 5 to 12 volts. Negative power supply. The most negative power supply pin, which is typically -5 to -12 volts. Digital power supply. The digital supply pin, which is connected to the logic power supply (maximum +5.5V). Ground. Ground return pin is typically connected to the signal ground pin of the EIA-232-D connector (Pin 7) as well as to the logic power supply ground. Receive Data Input. These are the EIA-232-D receive signal inputs whose voltages can range from +25 to -25V. A voltage between +3 and +25 is decoded as a space and causes the corresponding DO pin to swing to ground (0V); a voltage between -3 and -25V is decoded as a mark and causes the DO pin to swing up to VCC. The actual turn-on input switchpoint is typically biased at 1.8V above ground, and includes 800mV of hysteresis for noise rejection. The nominal input impedance is 5kΩ. An open or grounded input pin is interpreted as a mark, forcing the DO pin to VCC. Data Output. These are the receiver digital output pins, which swing from VCC to GND. A space on the RX pin causes DO to produce a logic zero; a mark produces a logic one. Each output pin is capable of driving one LSTTL input load. Data Input. These are the high-impedance digital input pins to the drivers. TTL compatibility is accomplished by biasing the input switchpoint at 1.4V above ground. However, 5V CMOS compatibility is maintained as well. Input voltage levels on these pins must be between VCC and GND. Transmit Data Output. These are the EIA-232-D transmit signal output pins, which swing toward VDD and VSS. A logic one at a DI input causes the corresponding TX output to swing toward VSS. A logic zero causes the output to swing toward VDD (the output voltages will be slightly less than VDD or VSS depending upon the output load). Output slew.


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