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
