INTRODUCTION

The MC145574 is Motorola’s second generation S/T transceiver and is a follow–up to the MC145474/75 transceiver.

The MC145574 provides the improved interfacing capabilities and reduced power consumption required by today’s ISDN applications, while maintaining the functionality and extended range perfor mance of the MC145474/75.

The MC145574 provides an economical VLSI layer 1 interface for the transportation of two 64 kbps B channels and one 16 kbps D channel between the network termination (NT) and terminal equipment applications (TEs). The MC145574 conforms to CCITT I.430, ETSI ETS 300012, and ANSI T1.605 specifications.

The MC145574 provides the modulation/line drive and demodulation/line receive functions required of the interface. In addition, the MC145574 provides the activation/deactivation, error monitoring, fram ing, bit, and octet timing. The MC145574 provides the control signals for the interface to the layer 2 devices. Complete multiframe capability is provided.



FEATURES

The features of the MC145574 are described below.

• Conforms to CCITT I.430, ETSI ETS 300012, and ANSI T1.605 Specifications

• Register Compatible With the First Generation MC145474/75

• Exceeds Q.502 Jitter Requirements for TE Slave Applications

• Pin Selectable NT or TE Modes of Operation

• Incorporates the IDL2, With Timeslot Assigner

• Industry Standard Microprocessor SCP

• GCI Interface

• Uses 2.5:1 Transformers for Transmit and Receive

• Exceeds the Recommended Range of Operation in All Configurations

• Complete Multiframing Capability Supported (SC1 – SC5 and Q Channel)

• Optional B Channel Idle, Invert, or Exchange

• Supports Full Range of S/T and IDL2 Loopbacks

• Supports Transmit Power–Down, Listening, and Absolute Minimum Power Modes

• Supports Crystal or External Clock Input Mode

• NT Star and NT Terminal Modes Supported

• Low Power Consumption

• Compatible with 3 V Devices