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3D3523 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 3D3523
部品説明 MONOLITHIC MANCHESTER ENCODER/DECODER
メーカ Data Delay Devices
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3D3523 Datasheet, 3D3523 PDF,ピン配置, 機能
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MONOLITHIC MANCHESTER
ENCODER/DECODER
(SERIES 3D3523)
FEATURES
All-silicon, low-power CMOS technology
Encoder and decoder function independently
Encoder has buffered clock output
3.3V operation
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
For mechanical dimensions, click here.
For package marking details, click here.
3D3523
ddealtaay 3
devices, inc.
PACKAGES
CIN 1 14 VDD
CEN 2 13 CBUF
RX 3 12 LOOP
COUT 4 11 TXENB
DIN 5 10 DOUTB
RESB 6
9 TXB
GND 7
8 TX
3D3523-xxx DIP (.300)
3D3523G-xxx Gull Wing (.300)
3D3523D-xxx SOIC (.150)
FUNCTIONAL DESCRIPTION
PIN DESCRIPTIONS
The 3D3523 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).
The encoder may be reset by setting the RESB input low; otherwise, it
should be left high. The TX and TXB signals may be disabled (high-Z) by
setting TXENB high. Similarly, CBUF may be disabled by setting CEN low.
Under most operating conditions, TX and TXB are always enabled, and
CBUF is not used. With this in mind, the 3D3523 provides internal pull-
down resistors on CEN and TXENB, so that most users can leave these
inputs uncommitted.
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
Common:
LOOP Loop enable
VDD +3.3 Volts
GND Ground
The Manchester decoder accepts the embedded-clock signal at the RX input. The recovered clock and
data signals are presented on COUT and DOUTB, respectively, with the data signal inverted. The
operating baud rate (in MBaud) is specified by the dash number of the device. The input baud rate may
vary by as much as ±15% from the nominal device baud rate without compromising the integrity of the
information received.
Because the decoder is not PLL-based, it does not require a long preamble in order to lock onto the
received signal. Rather, the device requires at most one bit cell before the data presented at the output is
valid. This is extremely useful in cases where the information arrives in bursts and the input is otherwise
turned off.
Normally, the encoder and decoder function independently. However, if the LOOP input is set high, the
encoded TX signal is fed back internally into the decoder and the RX input is ignored. This feature is
useful for diagnostics. The LOOP input has an internal pull-down resistor and may be left uncommitted if
this feature is not needed.
2006 Data Delay Devices
Doc #06006
5/8/2006
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
1

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