MC145574AAC Freescale Semiconductor, MC145574AAC Datasheet - Page 15

• Manufacturer Part Number: MC145574AAC
• Description: IC TRANSCEIVER ISDN 32-LQFP
• Manufacturer: Freescale Semiconductor
• Type: Transceiverr

Specifications of MC145574AAC

• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 32-LQFP
• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Drivers/receivers: -
• Protocol: -
• Lead Free Status / Rohs Status: Compliant

MOTOROLA
1.1
1.2
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 re-
quired 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.
The MC145574 features the interchip digital link (IDL2) for the exchange of the 2B+D channel informa-
tion between ISDN components and systems. The MC145574 provides an industry standard serial
control port (SCP) to program the operation of the transceiver. As an alternative to the IDL2+SCP
combination, a general circuit interface (GCI) is provided.
The MC145574 is not pin compatible with the MC145474/75, but it does have a compatible register
set. However, to make full use of the additional MC145574 features, software enhancements are re-
quired.
ORGANIZATION OF DATA SHEET
This data sheet is comprised of 20 sections. Section 1 is an introduction, serving to outline the features,
package types, and pin assignments of the MC145574. Section 2 describes the various wiring configu-
rations which are applicable to the MC145574, and the operational distances as recommended by
CCITT I.430, ETSI ETS 300012, and ANSI T1.605. Section 3 addresses the activation and deactivation
procedures of the MC145574.
The MC145574 incorporates the IDL2. This is a four–wire interface used for full–duplex communication
between ICs on the board level. Two 64 kbps B channels and one 16 kbps D channel are transmitted
and received over this interface. Section 4 is a detailed description of the IDL2.
The MC145574 incorporates an SCP interface. The SCP is a four–wire interface conforming to an
industry standard multi–drop serial link. The SCP is compatible with Motorola’s serial peripheral inter-
face (SPI). The SCP makes use of seven nibble registers, 16 byte registers and 10 overlay registers.
Section 5 is a description of the SCP. A per bit description of the nibble, byte, and overlay registers
is provided in Sections 8, 9, and 10, respectively. When the MC145574 is configured as a TE, it is
equipped with five interrupt modes. When configured as an NT, it is equipped with four interrupt modes.
Section 15 describes these interrupts.
The MC145574 also features a GCI interface. This is a standard four–wire interface which allows full–
duplex transmission of two 64 kbps B channels and one 16 kbps D channel, multiplexed with control
and maintenance information channels. Section 6 is a description of the GCI.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
MC145574
INTRODUCTION
1
1–1