PDF MC145403 Data sheet ( Hoja de datos )

Número de pieza	MC145403
Descripción	(MC145403 - MC145408) DRIVER / RECEIVERS
Fabricantes	Motorola Semiconductors
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No Preview Available ! www.DataSheet4U.com MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145403/D Drivers/Receivers EIA–232–E and CCITT V.28 These devices are silicon gate CMOS ICs that combine both the transmitter and receiver to fulfill the electrical specifications of EIA Standard 232–E and CCITT V.28. The drivers feature true TTL input compatibility, slew rate limiting outputs, 300 Ω power–off source impedance, and output typically switching to within 25% of the supply rails. The receivers can handle up to ± 25 V while presenting 3 to 7 kΩ impedance. Hysteresis in the receivers aid in the reception of noisy signals. By combining both drivers and receivers in a single CMOS chip, these devices provide efficient, low–power solutions for both EIA–232–E and V.28 applications. These devices offer the following performance features: Drivers • ± 5 to ± 12 V Supply Range • 300 Ω Power–Off Source Impedance • Output Current Limiting • TTL and CMOS Compatible Inputs • Driver Slew Rate Range Limited to 30 V/µs Maximum Receivers • ± 25 V Input Range • 3 to 7 kΩ Input Impedance • 0.8 V of Hysteresis for Enhanced Noise Immunity • TTL and CMOS Compatible Outputs Available Driver/Receiver Combinations Device Drivers Receivers Figure No. of Pins MC145403 3 5 1 20 MC145404 4 4 2 20 MC145405 5 3 3 20 MC145408 5 5 4 24 Alternative EIA–232 devices to consider are: Three Supply Single Supply MC145406 (3 x 3) MC145407 (3 x 3) MC145705 (2 x 3) with Power Down MC145706 (3 x 2) with Power Down MC145707 (3 x 3) with Power Down MC145403 MC145404 MC145405 MC145408 20 1 P SUFFIX PLASTIC DIP CASE 738 24 1 P SUFFIX PLASTIC DIP CASE 724 20 1 DW SUFFIX SOG PACKAGE CASE 751D 24 1 DW SUFFIX SOG PACKAGE CASE 751E SD SUFFIX SSOP CASE 940B 20 1 ORDERING INFORMATION MC145403P MC145404P MC145405P MC145408P Plastic DIP Plastic DIP Plastic DIP Plastic DIP MC145403DW MC145404DW MC145405DW MC145408DW SOG Package SOG Package SOG Package SOG Package MC145405SD SSOP REV 2 1/97 TN97010600 ©MOMoTtoOroRla,OInLc.A1997 DataSheet4 U .com MC145403•MC145404•MC145405•MC145408 1 1 page www.DataSheet4U.com 1 24 22 VDD VCC 3 DI1 Tx1 20 DI2 5 Tx2 18 DI3 7 Tx3 16 DI4 9 Tx4 14 DI5 VDD 12 11 Tx5 GND 13 Vin = ± 2 V +Rout Vin I DRIVERS DI 50% Tx 90% tPHL tf 10% RECEIVERS Rx 50% tPHL 90% DO 10% tf Figure 1. Power–Off Source Resistance Illustrated for MC145408 +3V 0V tr VOH VOL tPLH +3V 0V tPLH VOH VOL tr DRIVERS +3V Tx –3V tSHL +3V –3V tSLH Slew Rate = 6V tSLH or tSHL Figure 2. Switching Characteristics Figure 3. Slew Rate Characteristics PIN DESCRIPTIONS VCC Digital Power Supply The digital supply pin, which is connected to the logic power supply (+ 5.5 V maximum). GND Ground Ground return pin is typically connected to the signal ground pin of the EIA–232–E connector (Pin 7) as well as to the logic power supply ground. VDD Most Positive Device Pin The most positive power supply pin, which is typically + 5 to + 12 V. VSS Most Negative Device Pin The most negative power supply pin, which is typically – 5 to – 12 V. Rx1 – Rxn Receive Data Input Pins These are the EIA–232–E receive signal inputs. A voltage between + 3 and + 25 V is decoded as a space, and causes the corresponding DO pin to swing to ground (0 V). A voltage between – 3 and – 25 V is decoded as a mark, and causes the corresponding DO pin to swing to VCC. DO1 – DOn Data Output Pins These are the receiver digital output pins which swing from VCC to GND. Each output pin is capable of driving one LSTTL input load. MOTOROLA DataSheet4 U .com MC145403•MC145404•MC145405•MC145408 5 5 Page

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