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HD-4702 - CMOS Programmable Bit Rate Generator

Description

The HD-4702/883 Bit Rate Generator provides the necessary clock signals for digital data transmission systems, such as a UART.

It generates 13 commonly used bit rates using an on-chip crystal oscillator or an external input.

Features

  • This Circuit is Processed in Accordance to MIL-STD-883 and is Fully Conformant Under the Provisions of Paragraph 1. 2. 1.
  • HD-4702/883 Provides 13 Commonly Used Bit Rates.
  • Uses a 2.4576MHz Crystal/Input for Standard Frequency Output (16 Times Bit Rate).
  • Low Power Dissipation.
  • Conforms to ElA RS-404.
  • One HD-4702/883 Controls up to Eight Transmission Channels.
  • Initialization Circuit Facilitates Diagnostic Fault Isolation.
  • On-.

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Full PDF Text Transcription

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HD-4702/883 June 1998 CMOS Programmable Bit Rate Generator Description The HD-4702/883 Bit Rate Generator provides the necessary clock signals for digital data transmission systems, such as a UART. It generates 13 commonly used bit rates using an on-chip crystal oscillator or an external input. For conventional operation generating 16 output clock pulses per bit period, the input clock frequency must be 2.4576MHz (i.e., 9600 Baud x 16 x 16, since there is an internal ÷ 16 prescaler). A lower input frequency will result in a proportionally lower output frequency. The HD-4702/883 can provide multi-channel operation with a minimum of external logic by having the clock frequency CO and the ÷ 8 prescaler outputs Q0 , Q1 , Q2 available externally.
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