Renesas IDT72V70800TF8

Overview

IDT72V70800TF8 from Integrated Device Technology is a 3.3 V, 512 × 512 non-blocking time slot interchange (TSI) digital switch optimized for ST-BUS®/GCI and wide frame pulse (WFP) telecommunication interfaces. It supports four 8.192 Mb/s serial data streams, delivers per-channel variable or constant throughput delay, and features 3.3 V I/O with 5 V tolerant inputs in a 64-pin STQFP package. It is deployed in voice/data TDM switching systems requiring precise channel-level routing and frame alignment.

For engineers reviewing the IDT72V70800TF8 datasheet, IDT72V70800TF8 pinout, IDT72V70800TF8 application, or IDT72V70800TF8 equivalent, key selection criteria include serial stream count (4), bit rate (8.192 Mb/s), per-channel delay mode control (V/C bit), frame offset calibration capability (±4.5 CLK periods), and microprocessor interface flexibility (Intel/Motorola multiplexed/non-multiplexed).

Technical Context

The IDT72V70800TF8 implements a dual-mode serial interface: ST-BUS®/GCI auto-detection when WFPS = LOW, and WFP frame alignment with 4.096 MHz HCLK when WFPS = HIGH. Its internal architecture includes parallel-to-serial and serial-to-parallel converters, 512-byte data memory, and connection memory mapped to 128 channels per stream.

It supports two distinct delay modes: variable delay (minimum 3 time-slots, frame-independent) and constant delay (minimum 1 frame, frame-integrity preserving). Per-channel control is implemented via 16-bit connection memory entries containing V/C, OE, LPBK, PC, and SAB/CAB bits - enabling broadcast, loopback, and high-impedance output per channel.

Key Specifications

Pinout & Package

Package: 64-pin Small Thin Quad Flatpack (STQFP), 0.50 mm pitch, 10 mm × 10 mm body size (order code TF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar time slot interchange applications.

Compared with IDT72V70800PF8, the IDT72V70800TF8 offers identical functionality in a smaller, thermally optimized STQFP package - critical for high-density telecom line cards. Compared with MC145508P, it delivers double channel count, modern low-voltage operation, programmable delay modes, and automatic interface detection - enabling next-generation TDM infrastructure upgrades.

Availability

IDT72V70800TF8 is available at Aetrix Electronics and suitable for voice over TDM switching, ST-BUS®-based PBX core, multi-stream GCI gateway, and WFP-enabled TDM router applications requiring stable component supply and long-term industrial availability.

Supply support for IDT72V70800TF8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions before its acquisition by Renesas Electronics in 2019.

The IDT72V70800TF8 belongs to IDT's time slot interchange (TSI) digital switch product line, designed specifically for carrier-grade and enterprise TDM infrastructure requiring non-blocking, low-latency, multi-stream channel switching with precise frame alignment.

FAQ

What is the primary function of the IDT72V70800TF8 in a TDM system?

The IDT72V70800TF8 functions as a 512 × 512 non-blocking time slot interchange (TSI) switch that routes individual 64 kbit/s PCM time slots between four 8.192 Mb/s serial streams. It preserves frame integrity in data applications and minimizes latency in voice applications through per-channel variable or constant throughput delay selection - making it essential for digital cross-connect systems, PBX cores, and GCI gateways.

Does the IDT72V70800TF8 support both ST-BUS® and GCI interfaces natively?

Yes, the IDT72V70800TF8 automatically detects and configures itself for either ST-BUS® or GCI frame formats when the WFPS pin is LOW. It identifies frame polarity by sampling the F0i input against CLK edges - using falling-edge alignment for ST-BUS® and rising-edge alignment for GCI - eliminating manual configuration or external format-select logic.

How does the frame offset calibration feature work in the IDT72V70800TF8?

The IDT72V70800TF8 uses the FE/HCLK pin to measure input frame skew relative to F0i. When WFPS = LOW, setting the SFE bit initiates a two-frame measurement cycle; the result appears in the FAR register's FD11–FD0 bits. This value (up to +4.5 CLK periods in ½-cycle steps) is then loaded into the FOR register to compensate for path-length-induced delays across serial backplanes - ensuring synchronized channel alignment.

Can the IDT72V70800TF8 operate with a 5 V microprocessor interface?

Yes, all I/O pins of the IDT72V70800TF8 - including AD0–AD7, D8–D15, A0–A7, CS, DS/RD, R/W/WR, AS/ALE, IM, RESET, and DTA - are 5 V tolerant while operating from a 3.3 V supply. This allows direct interfacing with legacy 5 V microprocessors or FPGAs without level-shifting circuitry, simplifying integration in mixed-voltage telecom systems.

What is the difference between variable and constant throughput delay modes in the IDT72V70800TF8?

In variable delay mode (V/C = 0), the IDT72V70800TF8 achieves minimum latency - as low as three time-slots - but delay varies depending on source/destination channel indices. In constant delay mode (V/C = 1), all channels incur exactly one frame (125 µs) of delay, preserving strict frame boundaries for concatenated data. The mode is selected per channel via the V/C bit in connection memory.