Switch Fabric 4K x 4K 3.3V 144-Pin TQFP Tray

The IDT72V70840 has a non-blocking switch capacity of 1,024 x 1,024 channels at 2.048 Mb/s, 2,048 x 2,048 channels at 4.096 Mb/s, and 4,096 x 4,096 channels at 8.192 Mb/s. With 32 inputs and 32 outputs, programmable per stream control, and a variety of operating modes the IDT72V70840 is designed for the TDM time slot interchange function in either voice or data applications. Some of the main features of the IDT72V70840 are low power 3.3 Volt operation, automatic ST-BUS /GCI sensing, memory block programming, simple microprocessor interface, one cycle direct internal memory accesses, JTAG Test Access Port (TAP) and per stream programmable input offset delay, variable or constant throughput modes, internal loopback, output enable, and Processor Mode. The IDT72V70840 is capable of switching up to 4,096 x 4,096 channels without blocking. Designed to switch 64 Kbit/s PCM or N x 64 Kbit/s data, the device maintains frame integrity in data applications and minimizes throughput delay for voice applications on a per channel basis. The 32 serial input streams (RX) of the IDT72V70840 can be run up to 8.192 Mb/s allowing 128 channels per 125µs frame. The data rates on the output streams (TX) are identical to those on the input stream. With two main operating modes, Processor Mode and Connection Mode, the IDT72V70840 can easily switch data from incoming serial streams (Data Memory) or from the controlling microprocessor (Connection Memory). As control and status information is critical in data transmission, the Processor Mode is especially useful when there are multiple devices sharing the input and output streams. With data coming from multiple sources and through different paths, data entering the device is often delayed. To handle this problem, the IDT72V70840 has a frame evaluation feature to allow individual streams to be offset from the frame pulse in half clock-cycle intervals up to +4.5 clock cycles.

• 32 serial input and output streams
• 4,096 x 4,096 channel non-blocking switching at 8.192 Mb/s
• Accepts data streams at 2.048 Mb/s, 4.096 Mb/s or 8.192 Mb/s
• Per-channel Variable Delay Mode for low-latency applications
• Per-channel Constant Delay Mode for frame integrity applications
• Automatic identification of ST-BUS® and GCI serial streams
• Automatic frame offset delay measurement
• Per-stream frame delay offset programming
• Per-channel high impedance output control
• Per-channel processor mode to allow microprocessor writes to TX streams
• Direct microprocessor access to all internal memories
• Memory block programming for quick set-up
• IEEE-1149.1 (JTAG) Test Port
• Internal Loopback for testing
• Available in 144-pin Thin Quad Flatpack (TQFP) and 144-pin Ball Grid Array (BGA) packages
• Operating Temperature Range -40°C to +85°C
• 3.3V I/O with 5V tolerant inputs and TTL compatible outputs