MM74HC942N National Semiconductor, MM74HC942N Datasheet
MM74HC942N
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MM74HC942N Summary of contents
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... Analog loopback for self test Y Power down mode Y Applications Built-in low speed modems Y Remote data collection Y Radio telemetry Y Credit verification Y Stand-alone modems Y Point-of-sale terminals Y Tone signalling systems Y Remote process control Y TRI-STATE is a registered trademark of National Semiconductor Corp RRD-B30M105 Printed January 1988 TL F 5348 – 2 ...
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... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage ( Supply Voltage ( Input Voltage ( Output Voltage ( OUT BB Clamp Diode Current ( Output Current per pin (I ) OUT GND Current per pin (I ...
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AC Electrical Characteristics Unless otherwise specified all specifications apply to the MM74HC942 over the range 10 10% and a 3 579MHz Symbol Parameter TRANSMITTER F Carrier Frequency Error CE Power Output 2nd ...
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Description of Pin Functions Pin Name Function No 1 DSI Driver Summing Input This may be used to transmit externally generated tones such as dual tone multifrequency (DTMF) dialing sig- nals 2 ALB Analog Loop Back A logic high on ...
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Functional Description (Continued) THE DEMODULATOR SECTION The Receive Filter The demodulator recovers the data from the received sig- nals The signal from the hybrid is a mixture of transmitted signal received signals and noise The first stage of the receive ...
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... Note The efficiency of the acoustic coupling will set the valves of R1 and R2 Power supply decoupling close to the device is recommend- ed Ground loops should be avoided For further discussion of these subjects see the Audio Radio Handbook published by National Semiconductor Corporation 5348– 5348– 5 ...
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... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Order Number MM74HC942J NS Package J20A Order Number MM74HC942N NS Package N20A 2 A critical component is any component of a life ...