MC145426 Motorola, MC145426 Datasheet
MC145426
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MC145426 Summary of contents
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... The UDLT chip–set consists of the MC145422 Master UDLT for use at the telephone switch linecard and the MC145426 Slave UDLT for use at the remote digital telset and/or data terminal. The devices employ CMOS technology in order to take advantage of their reliable low– ...
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... MC145422 — MASTER (PLASTIC PACKAGE ref SI1 6 SO1 7 SI2 8 SO2 MC145426 — SLAVE (PLASTIC PACKAGE ref SI1 6 SO1 7 SI2 8 SO2 9 Mu MC145422 MC145426 2 4 DataSheet U .com PIN ASSIGNMENTS ...
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... DataSheet U .com MC145422 MASTER UDLT BLOCK DIAGRAM + 1 MODULATION BUFFER – 1 RECEIVE REGISTER SEQUENCE AND CONTROL VD CONTROL DEMODULATION TRANSMIT REGISTER MC145426 SLAVE UDLT BLOCK DIAGRAM + 1 LOOPBACK – 1 CONTROL TONE GEN. POWER– SEQUENCE DOWN AND CONTROL CONTROL OSC VD CONTROL DEMODULATION TRANSMIT REGISTER ...
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... Modulation Baud Rate (See Note 2) NOTES: 1. The MC145426 crystal frequency divided by 512 must equal the MC145422 MSI Frequency 2. Assumes crystal frequency of 4.096 MHz for the MC145426 and 2.048 MHz CCI for the MC145422. DIGITAL CHARACTERISTICS Input High Level Input Low Level ...
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... MSI to TDC/RDC Setup Time TE1/RE1 to TDC/RDC Setup Time Rx to TDC/RDC Setup Time Rx to TDC/RDC Hold Time SI1, SI2 to MSI Setup Time SI1, SI2 to MSI Hold Time MC145426 SWITCHING CHARACTERISTICS Parameter Input Rise Time Input Fall Time Clock Output Pulse Width Crystal Frequency ...
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... CLK, TDC, RDC, RE1, CCI, MSI MSI VD, SO1, SO2 TDC Tx MC145422 MC145426 6 4 DataSheet U .com 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 ...
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... TE1, RE1, MSI TDC, RDC, CLK MOTOROLA 4 DataSheet U .com SWITCHING WAVEFORMS (continued) 70% t su3 70% TDC, RDC Figure 4. 70% t su5 70% Rx 30% Figure 5. t su6 TE1 (MC145426) OR MSI (MC145422) 70% SI1, SI2 30% Figure 6. 30% t su4 30% 30 70% 30% 70% 30 70% 30% MC145422 MC145426 7 ...
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... TE1 CLK RE1 CLK Tx CLK MC145422 MC145426 8 4 DataSheet U .com SWITCHING WAVEFORMS (continued) 70 70% Figure 7. 70 70% Figure 8. 70% SO1, SO2 30 70% TE1 Figure 9. 30 70% 30 70% 70% 30 70% MOTOROLA ...
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... TDC/RDC after the rising edge of TE1. Data on the Rx pin is loaded into the receive register of the UDLT on the eight falling edges of TDC/RDC after a positive transition on RE1. This clock should be ap- proximately leading–edge aligned with MSI. MC145422 MC145426 9 ...
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... Line Driver Outputs 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 not modulating the line. MC145426 SLAVE UDLT PIN DESCRIPTIONS V DD Positive Supply Normally 5 V. ...
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... DataSheet U .com BACKGROUND The MC145422 master and MC145426 slave UDLT trans- ceiver ICs main application is to bidirectionally transmit the digital signals present at a codec–filter digital–PABX back- plane interface over normal telephone wire pairs. This allows the remoting of the codec–filter in a digital telephone set and enables each set to have a high speed data access to the PABX switching facility ...
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... CLK pin. On the ninth rising edge of CLK, TE1 goes low, RE1 goes high, and voice data from the codec–filter is input to the receiver register from the Rx pin on the next eight falling edges of CLK. RE1 is TE1 inverted and is provided to facilitate interface to the codec–filter. MC145422 MC145426 12 4 DataSheet U ...
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... LATCH SI1, SI2. TWO CCI CLOCKS LATER, TRANSFER RECEIVE REGISTER TO MODULATION BUFFER, START MODULATION. MOTOROLA 4 DataSheet U .com 125 s THREE–STATE VALID DATA DON’T CARE Figure 10. Master UDLT Timing OUT IN DON’T CARE IN VALID IN OUT OUT TRANSFER DEMODULATOR DATA TO DEMODULATION BUFFER MC145422 MC145426 13 ...
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... TE1 RE1 Tx Rx SI1, SI2 SO1, SO2 VD DEMODULATION DATA TRANSFER TO DEMODULATION BUFFER NOTE: 1. Slip between master and slave is taken up in this period. MC145422 MC145426 14 4 DataSheet U .com 125 s VOICE DON’T CARE DON’T CARE TRANSFER DEMODULATION BUFFER TO TRANSMIT REGISTER, GENERATE ENABLES, LATCH SI1, SI2, OUTPUT Tx, SO1, SO2, OUTPUT VALID DATA, START 128 kHz CLOCK, START MODULATION AFTER FOUR 256 kHz BAUD PERIODS ...
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... AWG twisted–pair wire as viewed the master UDLT and the slave UDLT. DIFFERENTIAL–PHASE–SHIFT KEYING MODIFIED DIFFERENTIAL–PHASE–SHIFT KEYING Figure 12. Modified Differential Phase Shift Keying Figure 13. Typical Signal Waveforms at Demodulator 13b. Bit Pattern — Random MC145422 MC145426 15 ...
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... MC145422 MC145426 16 4 DataSheet U .com MASTER BIT PATTERN — 1010101000 BIT PATTERN — RANDOM Figure 14. Typical Signal Waveforms at Demodulator SLAVE MOTOROLA ...
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... MOTOROLA 4 DataSheet U .com Figure 15. Typical Multichannel Digital Line Card MC145422 MC145426 17 ...
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... MC145422 MC145426 18 4 DataSheet U .com Figure 16. Basic Digital Telset MOTOROLA ...
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... MOTOROLA 4 DataSheet U .com MC145426 MC145502 Figure 17. Full–Featured Digital Telset MC145422 MC145426 19 ...
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... Motorola, Inc. Motorola, Inc Equal Opportunity/Affirmative Action Employer. How to reach us: USA/EUROPE: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 MFAX: RMFAX0@email.sps.mot.com – TOUCHTONE (602) 244–6609 INTERNET: http://Design–NET.com MC145422 MC145426 20 4 DataSheet U .com ...