Renesas IDT72V70810PF

Overview

IDT72V70810 from Integrated Device Technology is a 3.3 V, 1,024 × 1,024 non-blocking time slot interchange (TSI) digital switch optimized for ST-BUS®/GCI and wide frame pulse (WFP) telecommunication interfaces. It supports eight 8.192 Mb/s serial data streams, delivers per-channel variable or constant throughput delay, and features 5V-tolerant I/O with −40°C to +85°C industrial temperature range. It is used in voice/data multiplexing systems such as digital loop carriers and TDM-based access gateways.

For engineers reviewing the IDT72V70810 datasheet, IDT72V70810 pinout, IDT72V70810 application, or IDT72V70810 equivalent, key selection criteria include frame alignment mode support (ST-BUS®/GCI vs. WFP), per-stream input offset calibration, microprocessor interface compatibility (Intel/Motorola multiplexed/non-multiplexed), and high-impedance output control per channel or globally via ODE/OSB.

Technical Context

The IDT72V70810 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, dual-port connection memory (1,024 × 16-bit), and data memory (up to 1,024 bytes), all synchronized to a 16.384 MHz master clock.

It supports two switching modes: Connection Mode (source address mapping from connection memory) and Processor Mode (direct data write to TX outputs). Per-channel control bits enable independent configuration of delay type (V/C), loopback (LPBK), output enable (OE), and CCO bit output - all programmable via its 16-bit parallel microprocessor port with IM-selectable bus timing.

Key Specifications

Pinout & Package

Package: 64-pin Thin Plastic Quad Flatpack (TQFP), 14 mm × 14 mm, 0.80 mm pitch (order code PF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PMC4208-RC and MT8980D, the IDT72V70810 uniquely combines 3.3 V operation with 5 V tolerant I/O, dual-mode frame alignment (ST-BUS®/GCI + WFP), and on-chip microprocessor bus logic - reducing BOM count and PCB area in new TDM infrastructure designs.

Availability

IDT72V70810 is available at Aetrix Electronics and suitable for digital loop carrier systems, TDM access gateways, remote radio head baseband processing, and SONET/SDH add-drop multiplexers requiring stable component supply across extended product lifecycles.

Supply support for IDT72V70810 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions for communications and computing markets.

The IDT72V70810 belongs to IDT's TSI digital switch product line, designed specifically for carrier-grade TDM infrastructure requiring deterministic low-latency channel switching, multi-format frame alignment, and seamless microprocessor integration.

FAQ

What is the primary function of the IDT72V70810 in a TDM system?

The IDT72V70810 serves as a non-blocking time slot interchange switch that dynamically routes 64 kbit/s PCM channels between eight 8.192 Mb/s serial streams. In a TDM system, it enables flexible cross-connection of voice or data time-slots - for example, redirecting channel 12 from RX2 to TX5 - under microprocessor control while preserving frame alignment and minimizing latency. Its dual delay modes ensure optimal performance for both voice and data payloads.

Does the IDT72V70810 support both ST-BUS® and GCI frame formats?

Yes, the IDT72V70810 automatically detects and configures itself for either ST-BUS® or GCI frame formats when the WFPS pin is LOW. It identifies frame polarity by evaluating the rising or falling edge of the F0i signal relative to the master clock (CLK), then adjusts bit sampling accordingly - rising-edge sampling for GCI and falling-edge for ST-BUS® - without requiring firmware intervention.

How does the IDT72V70810 handle input stream skew in multi-board systems?

The IDT72V70810 measures input frame offset skew per RX stream using the FE/HCLK pin and stores calibrated values in frame input offset registers (FOR0–FOR7). These values are applied to align incoming frames before switching, compensating for up to +4.5 master clock periods (≈275 ns) of inter-stream delay - critical for maintaining channel coherency in distributed switching fabrics with varying PCB trace lengths.

Can the IDT72V70810 operate with a 5 V microprocessor interface?

Yes - all IDT72V70810 I/O pins, including AD0–AD7, D8–D15, A0–A7, CS, R/W/WR, DS/RD, and AS/ALE, are 5 V tolerant while operating from a 3.3 V supply. This allows direct connection to 5 V microprocessors or FPGAs without level-shifting circuitry, simplifying interface design and improving signal integrity in mixed-voltage telecom control planes.

What is the role of the ODE and OSB pins in output control of the IDT72V70810?

The ODE (Output Drive Enable) pin provides global enable/disable control for all TX0–TX7 drivers. When ODE = LOW, TX outputs enter high-impedance unless overridden by the OSB (Output Stand By) bit in the IMS register. If ODE = LOW and OSB = 1, TX drivers remain active; if OSB = 0, they go high-Z. When ODE = HIGH, OSB is ignored and all TX drivers are enabled - allowing hierarchical control from hardware pin and register.