MC100SX1230 Datasheet, PDF (1/8 Pages) ON Semiconductor – CMI CODER/DECODER

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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CMI Coder/Decoder
The MC100SX1230 device consists of a Binary to CMI Coder and CMI
to Binary Decoder with integrated loop back capability. The device is
designed for CMI (Code Mark Inversion) interfaces in transmission
applications supporting either 139.26 Mbit/s E4 or 155.52 Mbit/s STM1
line rates.
• Binary-to-CMI Coder and CMI-to-Binary Decoder
• Internal Loop Back Test Capability
• Supports SDH or PDH Applications
• Low Power
• Fully Differential 100K Compatible I/O
• VBB Reference Available
• 75kΩ Input Pulldown Resistors
• +5V PECL or –5V ECL Operation
• 28-Pin Surface Mount PLCC Package
• Asynchronous Reset
In normal operation, the coder and decoder operate independently.
Both the coder and decoder operate from a 2X line rate clock. The device
incorporates test circuitry to support loop back bypass so either the coder
input can be routed to the decoder output or the decoder input can be
routed to the coder output. The part is fabricated using Motorola’s proven
MOSAIC III™ advanced bipolar process.
The device provides a VBB output for accepting single-ended inputs.
The VBB pin should only be used as a bias for the MC100SX1230 as its
current sink/source capability is limited. Whenever used, the VBB pin
should be bypassed to ground via a 0.01µF capacitor.
CCLKout CCLKout QCMI QCMI QBIN QBIN DCLKout
25 24 23 22 21 20 19
LCMI 26
18
DCLKout
LBIN 27
17 VCC
VEE 28
16 VCC
VEE 1
DCLKin 2
Pinout: 28-Lead PLCC
(Top View)
15 VCCO
14 VCCO
DCLKin 3
13 N/C
VBB 4
56
12 N/C
7 8 9 10 11
RESET CMIin CMIin BINin BINin CCLKin CCLKin
MC100SX1230
CMI CODER/DECODER
FN SUFFIX
PLASTIC PLCC PACKAGE
CASE 776-02
PIN NAMES
Pins
Function
CMIin, CMIin
DCLKin, DCLKin
QBIN, QBIN
DCLKout, DCLKout
CMI Input to Decoder
Decoder Clock Input
Binary Output From Decoder
Decoder Clock Output
BINin, BINin
CCLKin, CCLKin
QCMI, QCMI
CCLKout, CCLKout
Binary Input to Coder
Coder Clock Input
CMI Output from Coder
Coder Clock Output
RESET
LBIN
LCMI
Asynchronous Reset
Control Input for Binary
Loop Back
Control Input for CMI
Loop Back
MOSAIC III is a trademark of Motorola, Inc.
This document contains information on a new product. Specifications and information herein are subject to
change without notice.
4/94
© Motorola, Inc. 1994
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