MC145422P Motorola, MC145422P Datasheet

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MC145422P

Manufacturer Part Number
MC145422P
Description
Universal digital loop transceiver
Manufacturer
Motorola
Datasheet

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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Universal Digital-Loop
Transceivers (UDLT)
that provide 80 kbps full–duplex data communication over 26 AWG and larger
twisted–pair cable up to two kilometers in distance. Intended primarily for use in
digital subscriber voice/data telephone systems, these devices can also be
used in remote data acquisition and control systems. These devices utilize a
256 kilobaud modified differential phase shift keying burst modulation technique
for transmission to minimize RFI/ EMI and crosstalk. Simultaneous power
distribution and duplex data communication can be obtained using a single
twisted–pair wire.
evolving, telephone switching hardware and software architectures.
telephone switch linecard and the MC145426 Slave UDLT for use at the remote
digital telset and/or data terminal.
reliable low–power operation and proven capability for complex analog/digital
LSI functions.
MC145422 Master UDLT
MC145426 Slave UDLT
REV 2
9/95
MOTOROLA
The MC145422 and MC145426 UDLTs are high–speed data transceivers
These devices are designed for compatibility with existing, as well as
The UDLT chip–set consists of the MC145422 Master UDLT for use at the
The devices employ CMOS technology in order to take advantage of their
Motorola, Inc. 1995
Provides Full–Duplex Synchronous 64 kpbs Voice/Data Channel and Two
8 kbps Signaling Data Channels Over One 26 AWG Wire Pair Up to Two
Kilometers
Compatible with Existing and Evolving Telephone Switch Architectures and
Call Signaling Schemes
Automatic Detection Threshold Adjustment for Optimum Performance Over
Varying Signal Attenuations
Protocol Independent
Single 5 V Power Supply
22–Pin PDIP, 24–Pin SOG Packages
Application Notes AN943, AN949, AN968, AN946, and AN948
Pin Controlled Power–Down and Loopback Features
Signaling and Control I/O Capable of Sharing Common Bus Wiring with
Other UDLTs
Variable Data Clock — 64 kHz to 2.56 MHz
Pin Controlled Insertion/Extraction of 8 kbps Channel into LSB of 64 kbps
Channel for Simultaneous Routing of Voice and Data Through PCM Voice
Path of Telephone Switch
Compatible with MC145500 Series PCM Codec–Filters
Pin Controlled Loopback Feature
Automatic Power–Up/Power–Down Feature
On–Chip Data Clock Recovery and Generation
Pin Controlled 500 Hz D3 or CCITT Format PCM Tone Generator for
Audible Feedback Applications
22
24
ORDERING INFORMATION
MC145422DW SOG Package
MC145426DW SOG Package
MC145422P
MC145426P
MC145422
MC145426
1
1
MC145422 MC145426
Order this document
Plastic DIP
Plastic DIP
SOG PACKAGE
PLASTIC DIP
DW SUFFIX
CASE 751E
CASE 708
P SUFFIX
by MC145422/D
1

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MC145422P Summary of contents

Page 1

... Audible Feedback Applications REV 2 9/95 MOTOROLA Motorola, Inc. 1995 Order this document by MC145422/D MC145422 MC145426 P SUFFIX PLASTIC DIP 22 CASE 708 1 DW SUFFIX SOG PACKAGE 24 CASE 751E 1 ORDERING INFORMATION MC145422P Plastic DIP MC145426P Plastic DIP MC145422DW SOG Package MC145426DW SOG Package MC145422 MC145426 1 ...

Page 2

... MC145422 MC145426 2 PIN ASSIGNMENTS MC145422 — MASTER (SOG PACKAGE ref SI1 7 SO1 8 SI2 9 SO2 MC145426 — SLAVE (SOG PACKAGE ref SI1 7 SO1 8 SI2 9 SO2 10 Mu CONNECTION LO1 22 LO2 RE1 TDC/RDC 17 CCI TE1 14 SIE 13 MSI LO1 22 LO2 RE1 CLK TE1 13 TE MOTOROLA ...

Page 3

... MC145422 MASTER UDLT BLOCK DIAGRAM LO1 + LO2 CCI MSI LI * — SE controlled latch MC145426 SLAVE UDLT BLOCK DIAGRAM + 1 LO1 LO2 - POWER- PD DOWN CONTROL X2 OSC X1 LI MOTOROLA MODULATION BUFFER * RECEIVE REGISTER * * SEQUENCE AND CONTROL * VD CONTROL DEMODULATION BUFFER * TRANSMIT REGISTER MODULATION BUFFER LOOPBACK RECEIVE CONTROL REGISTER TONE GEN ...

Page 4

... A – 10 — 60 — A 100 — – 3.4 — mA – 0.7 — 1.7 — mA 3.5 — 100 — k 4.0 4.4 MHz – 22 – 18 dBm0 — – 450 — A 450 — A 800 A drive capability. 0.25% for optimum performance. MOTOROLA ...

Page 5

... Propagation Delay Times TE1 Rising to CLK ( TE1 Rising to CLK ( RE1 Falling to CLK ( RE1 Falling to CLK ( CLK Setup Time Rx to CLK Hold Time SI1, SI2 to TE1 Setup Time SI1, SI2 to TE1 Hold Time MOTOROLA LO1 to LO2 ( pF) Figure No. Symbol All Digital Inputs All Digital Inputs ...

Page 6

... CLK, TDC, RDC, RE1, CCI, MSI MSI VD, SO1, SO2 TDC Tx MC145422 MC145426 6 SWITCHING WAVEFORMS t w(H) t w(L) 90% 50% 10 Figure 1. 70% t PHL 70% Figure 2. 70% t PLH 70% Figure 3. 50% 70% t PLH 30% 70% t PHL 30% MOTOROLA ...

Page 7

... TE1, RE1, MSI TDC, RDC TDC, RDC, CLK Rx TE1 (MC145426) OR MSI (MC145422) SI1, SI2 MOTOROLA SWITCHING WAVEFORMS (continued) 70% t su3 70% Figure 4. 70% 30% t su5 t h1 70% 70% 30% 30% Figure 5. t su6 70% 30 70% 70% 30% 30% Figure 6. 30% t su4 30% MC145422 MC145426 7 ...

Page 8

... TE1 CLK RE1 t P3 70% CLK 70 70% CLK MC145422 MC145426 8 SWITCHING WAVEFORMS (continued) 70 70% Figure 7. 70% Figure 8. SO1, SO2 TE1 Figure 9. 30 70% 30 70% 70% 30 70% MOTOROLA ...

Page 9

... SO1, SO2, and VD outputs function normally. If held low, the state of these inputs is latched and held internally while the outputs are high impedance. This allows these pins to be bussed with those of other UDLTs to a common controller. MOTOROLA PD Power–Down Input If held low, the UDLT ceases modulation. In power–down, ...

Page 10

... While high, the voice data just demodulated is output on the first eight rising edges of CLK at the Tx pin. The signaling data just demodulated is output on SO1 and SO2 on TE1’s rising edge VD. MOTOROLA ...

Page 11

... These outputs drive the twisted pair line with 256 kHz modified DPSK bursts each frame and are push–pull. These pins are driven to V ref when the device is not modulating. MOTOROLA BACKGROUND The MC145422 master and MC145426 slave UDLT trans- ceiver ICs main application is to bidirectionally transmit the digital signals present at a codec– ...

Page 12

... The weak output drivers will try to force PD high when a transmission from the master is demo- dulated and will try to force it low if 250 s have passed with- out a transmission from the master. This allows the slave UDLT to self power–up and down in demand power–loop systems. MOTOROLA ...

Page 13

... SO1, SO2 VD DEMODULA TOR SYNC TRANSFER RECEIVE REGISTER TO MODULATION BUFFER, LATCH VALID DATA PIN, OUT (INTERNAL) LATCH SI1, SI2. TWO CCI CLOCKS LATER, TRANSFER RECEIVE REGISTER TO MODULATION BUFFER, MOTOROLA 125 s THREE-STATE VALID DATA DON'T CARE START MODULATION. Figure 10. Master UDLT Timing ...

Page 14

... LATCH SI1, SI2, OUTPUT Tx, SO1, SO2, OUTPUT VALID DATA, START 128 kHz CLOCK, START MODULATION AFTER FOUR 256 kHz BAUD PERIODS. DEMODULA TION DATA TRANSFER TO DEMODULA TION BUFFER NOTE: 1. Slip between master and slave is taken up in this period. MC145422 MC145426 14 125 s HIGH IMPEDANCE DON'T CARE Figure 11. Slave UDLT Timing NOTE 1 VOICE MOTOROLA ...

Page 15

... Figure 12. Modified Differential Phase Shift Keying 13a. Bit Pattern — 1010101000 Figure 13. Typical Signal Waveforms at Demodulator MOTOROLA spectral content of the waveform, which, save for some key differences, appears quite similar to frequency shift keying. The burst always begins and ends with a half–cycle of 256 kHz, which helps locate bit boundaries ...

Page 16

... MASTER Figure 14. Typical Signal Waveforms at Demodulator MC145422 MC145426 16 SLAVE BIT PATTERN 1010101000 BIT PATTERN RANDOM MOTOROLA ...

Page 17

... Figure 15. Typical Multichannel Digital Line Card MOTOROLA MC145422 MC145426 17 ...

Page 18

... MC145422 MC145426 18 Figure 16. Basic Digital Telset MOTOROLA ...

Page 19

... MOTOROLA MC145426 MC145502 Figure 17. Full–Featured Digital Telset MC145422 MC145426 19 ...

Page 20

... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “ ...

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