Applications ■ Digital terrestrial communication networks ■ Digital wireless communications networks ■ Digital personal communication networks ■ Voiceband telephony — Voice calls — Low-speed modem calls — Voice over Internet — Packetized voice (e.g., frame relay, ATM) ■ Centralized applications — Local exchange (LEC) office — Interexchange (IEC) office — Mobile telephone switching office (MTSO) — Base-station controllers — Packetized voice equipment Description The TECO3264 32-channel echo canceller (EC) device is a 3.3 V, CMOS, very large-scale integration (VLSI) component offering 32 independent channels of echo cancellation. Packaged in a 160-pin, plastic, metric quad flat pack with heat speader (MQFPH) and handling up to 64 ms of tail-end delay, this device combines high performance, high channel density, low power dissipation, high flexibility, excellent maintenance capability, and low cost into a single package. The TECO3264 32-channel echo canceller provides echo cancellation for both T1 and E1 systems. The device operates from a single 3.3 V supply and requires only an external 8.192 MHz clock and 8 kHz frame sync. Built-in self-test logic affords easy device verification while integrated boundary-scan capability reduces board verification time and cost. A high-speed microprocessor interface and full user provisionability on device pins provide maximum flexibility