IDT72V8985 Datasheet | Renesas

3.3 VOLT TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256 Features : - 256 x 256 channel non-blocking switch - Automatic signal identification (ST-BUS®, GCI) - 8 RX inputs- 32 channels at 64 Kbit/s per serial line - 8 TX outputs- 32 channels at 64 Kbit/s per serial line - Three-state serial outputs - Microprocessor Interface (8-bit data bus) - Frame Integrity for data applications - 3.3V Power Supply - Available in 44-pin Plastic Leaded Chip Carrier (PLCC) - Operating Temperature Range -40°C to +85°C - 3.3V I/O with 5V Tolerant Inputs DESCRIPTION: The IDT72V8985 is a ST-BUS®/GCI patible digital switch controlled by a microprocessor. The IDT72V8985 can handle as many as 256, 64 Kbit/s input and output channels. Those 256 channels are divided into 8 serial inputs and outputs, each of which consists of 32 channels. The IDT72V8985 provides perchannel variable or constant throughput delay modes and microprocessor read and write access to individual channels. As an important function of a digital switch is to maintain sequence integrity and minimize throughput delay, the IDT72V8985 is an ideal solution for most switching needs. FUNCTIONAL DESCRIPTION Frame sequence, constant throughput delay, and guaranteed minimum delay are high priority requirements in today’s integrated data and multimedia networks. The IDT72V8985 provides these functions on a per-channel basis using a standard microprocessor control interface. Each of the eight serial lines is designed to switch 64 Kbit/s PCM or N x 64 Kbit/s data. In Processor Mode, the microprocessor can access the input and output time slots to control other devices such as ISDN transceivers and trunk interfaces. Supporting both GCI and ST-BUS® formats, IDT72V8985 has incorporated an internal circuit to automatically identify the polarity and format of the frame synchronization. A functional block diagram of the IDT72V8985 device is shown on page 1. The serial streams operate continuously at 2.048 Mb/s and are...