DESCRIPTION

ST5481 combines ISDN link access and an USB interface to allow a very simple USB/ISDN modem design with all ISDN protocols and upper applications processed into the HOST PC.

HARDWARE FEATURES

S/T ISDN Interface

■ SUPPORTS OSI LEVEL 1 IN CONFORMANCE WITH UIT-T I.430 FOR BASIC ACCESS AT S AND T INTERFACES (ETSI 300012/ANSI T1.605)

■ LINE INTERFACE TRANSFORMER DIRECT DRIVE

■ FULL-DUPLEX TRANSMISSION AT 192KBps ON SEPARATE TRANSMIT AND RECEIVE TWISTED PAIRS USING ALTERNATE MARK INVERSION (AMI) LINE CODING

■ 2 B CHANNELS AT 64KBps EACH PLUS 1 D CHANNEL AT 16KBps

■ ALL I.430 WIRING CONFIGURATIONS SUPPORTED INCLUDING PASSIVE BUS FOR TE’S DISTRIBUTED POINT TO POINT AND POINT TO MULTIPOINT

■ MULTIFRAME SUPPORT

■ ANALOG PART: INCLUDED WITH ADAPTIVE DETECTION THRESHOLD AND EQUALIZER

USB Interface

■ USB 1.0 SPECIFICATION FULL COMPLIANCE, 1.1 SPECIFICATION COMPATIBILITY (1.1 POWER MANAGEMENT COMPLIANCE), 12 MBps FULL SPEED

■ ON-CHIP USB TRANSCEIVER WITH DIGITAL PLL

■ 6 ISOCHRONOUS ENDPOINTS FOR B1, B2, D CHANNELS DATA.INTERRUPT ENDPOINT FOR I430

■ ISDN PROTOCOL AND DATA.CONTROL ENDPOINT FOR USB STANDARD PLUS VENDOR SPECIFIC REQUEST

■ COMMUNICATION DEVICE CLASS AND VENDOR REQUESTS

■ BUS OR SELF POWERED APPLICATION (PIN PROGRAMMABLE)

■ ONNOW POWER MANAGEMENT (D0,D2,D3) SUSPEND MODE COMPLIANCE

■ PIN PROGRAMMABLE HIGH/LOW POWER USB DEVICE REGISTRATION, WAKE-UP CAPABILITY, USB DEVICE IDENTIFICATION

GENERAL

– USB hot plug and play interface.

– Control access and interrupt handling provided through the USB interface.

– All FIFOS and FIFOS management needed included for USB/ISDN data processing.

– Internal PLL to generate the USB 48MHz clock from a 15.36MHz crystal.

– Internal regulator for 3.3V generation from USB bus 5V.

– 48 pin TQFP package.

– 0.35 micron HCMOS 6 process.