MONOLITHIC MANCHESTER ENCODER/DECODER
Description
3D7503
MONOLITHIC MANCHESTER ENCODER/DECODER (SERIES 3D7503)
FEATURES
• • • • • • • • • • All-silicon, low-power CMOS technology Encoder and decoder function independently Encoder has buffered clock output TTL/CMOS compatible inputs and outputs Vapor phase, IR and wave solderable Auto-insertable (DIP pkg.
) Low ground bounce noise Maximum data rate: 50 MBaud Data rate range: ±15% Lock-in time: 1 bit
CIN CEN RX COUT DIN RESB GND
data 3 ® delay devices, inc.
PACKAGES
1 2 3 4 5 6 7 14 13 12 11 10 9 8 VDD CBUF LOOP TXENB DOUTB TXB TX
3D7503-xxx DIP (.
300) 3D7503G-xxx Gull Wing (.
300) 3D7503D-xxx SOIC (.
150)
FUNCTIONAL DESCRIPTION
The 3D7503 is a monolithic CMOS Manchester Encoder/Decoder combo chip.
The device uses bi-phase-level encoding to embed a clock signal into a data stream for transmission across a communications link.
In this encoding mode, a logic one is represented by a high-to-low transition in the center of the bit cell, while a logic zero is represented by a low-to-high transition.
The Manchester encoder combines the clock (CIN) and data (DIN) into a single bi-phase-level signal (TX).
An inverted version of this signal (TXB) is also available.
The data baud rate (in MBaud) is equal to the input clock frequency (in MHz).
A replica of the clock input is also available (CBUF).
PIN DESCRIPTIONS
Encoder: CIN Clock Input DIN Data Input RESB Reset CEN Clock buffer enable TXENB Transmit enable CBUF Buffered clock TX,TXB Transmitted signal Decoder: RX Received Signal COUT Recovered Clock DOUTB Recovered Data
The encoder may be reset by setting the RESB input low; otherwise, it Common: should be left high.
The TX and TXB signals may be disabled (high-Z) by LOOP Loop enable setting TXENB high.
Similarly, CBUF may be disabled by setting CEN VDD +5 Volts low.
Under most operating conditions, the encoder is never reset, TX and GND Ground TXB are always enabled, and CBUF is not used.
With this in mind, the 3D7503 provides an internal pull-up resistor on RESB and int...
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