SAB82520

High-Level Serial Communications Controller (HSCC) 1 Features Two independent HDLC channels Implementation of X.25 LAPB/LAPD protocol Programmable timeout and retry conditions FIFO buffers for efficient transfer of data packets Digital phase-locked loop for each channel Baudrate generator and oscillator Different modes for clock recovery and data encoding High-speed data rate (up to 4 MHz) Supports bus configuration by collision resolution Telecom-specific features programmable 8-bit parallel µP interface Advanced CMOS technology Low power consumption; active: 25 mW at 4 MHz standby: 3 mW SAB 82520: operating temperature 0 to 70 ˚C SAF 82520: operating temperature – 40 to 85 ˚C SAB 82520 SAF 82520 P-LCC-28-R P-DIP-28 SAB 82520, a High-level Serial Communications Controller (HSCC), has been designed to free the user from tasks occurring in communication via networks and trunk lines. SAB 82520 is an X.25 LAPB/LAPD controller which, to a large degree performs communications procedures independently of CPU support. A parallel processor bus constitutes the µC system. The communications interface is implemented by two full-duplex HDLC channels, which can be operated independently from one another. The HSCC is connected to the transmission line via additional line drivers or modems. External logic is cost-effective because clock recovery can be performed by an onchip oscillator, DPLL circuits and a programmable baudrate generator. Type SAB 82520-N SAB 82520-P SAF 82520-N SAF 825...