Renesas 72V71643DA

Overview

72V71643DA from Integrated Device Technology (IDT) is a 3.3 V, 4,096 × 4,096 non-blocking time slot interchange (TSI) digital switch IC for ST-BUS®/GCI telecom infrastructure. It supports up to 32 serial input and 32 serial output streams at data rates of 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s, or 16.384 Mb/s, with per-channel variable or constant delay modes and JTAG test access. It is used in TDM switching systems requiring rate matching between mixed-speed serial streams.

For engineers reviewing the 72V71643DA datasheet, 72V71643DA pinout, 72V71643DA application, or 72V71643DA equivalent, this page delivers verified technical context on frame alignment evaluation, microprocessor-accessible connection memory, output enable indication (OEI), loopback diagnostics, and dual-mode rate matching (Mux/Demux and Split) - all critical for TDM switch design, voice/data convergence, and legacy telecom interface integration.

Technical Context

The 72V71643DA implements a fully non-blocking TSI architecture with separate Data Memory (read-only, 4,096 × 16-bit) and Connection Memory (read/write, 4,096 × 16-bit), enabling dynamic path reconfiguration without contention. Its timing unit supports automatic ST-BUS®/GCI frame detection via F0i and FE/HCLK, with programmable frame offset measurement (±4.5 CLK cycles at ≤8 Mb/s) and wide frame pulse (WFP) mode via WFPS.

It features dual operating modes: Processor Mode (microprocessor writes directly to TX streams via Connection Memory) and Connection Mode (data routed from RX streams through address-mapped paths). Rate matching is implemented via DR3–DR0 control bits selecting Regular, Mux/Demux, or Split configurations - each guaranteeing non-blocking operation across asymmetric input/output data rates.

Key Specifications

Pinout & Package

72V71643DA is packaged in a 144-pin Thin Quad Flatpack (TQFP), 0.50 mm pitch, 20 mm × 20 mm footprint (order code DA144-1). Pin functions are validated per IDT DSC-5902/5 datasheet Figures 2 and 3 and Table 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V71623DA and CY7C1451AV, the 72V71643DA uniquely delivers full 4K×4K non-blocking switching with integrated frame evaluation, auto-format detection, and JTAG - making it the only option for carrier-grade, multi-standard, field-diagnosable TDM infrastructure.

Availability

72V71643DA is available at Aetrix Electronics and suitable for central office switching, telecom access gateways, and SONET add-drop multiplexers requiring stable component supply and long-term lifecycle support.

Supply support for 72V71643DA 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, RF, memory interface, and telecom ICs before its acquisition by Renesas in 2019. IDT pioneered high-density TSI solutions for digital telephony.

The 72V71643DA belongs to IDT's 72V71xxx family of time slot interchange switches, designed specifically for carrier-class TDM infrastructure requiring mixed-rate rate matching, frame integrity preservation, and in-system testability.

FAQ

What is the maximum data rate supported by the 72V71643DA?

The 72V71643DA supports serial data rates of 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s, and 16.384 Mb/s on all 32 RX and TX streams. At 16.384 Mb/s, the master clock (CLK) runs at 16.384 MHz with single-bit-per-clock timing; at lower rates, CLK operates at twice the data rate for dual-clock-per-bit sampling. This enables direct interfacing with E1, T1, E3, and STM-1 tributary signals without external clock dividers.

How does the 72V71643DA handle frame synchronization across mixed-rate streams?

The 72V71643DA uses the F0i input to detect frame boundaries and automatically identifies ST-BUS® or GCI format based on sync pulse polarity and timing. When WFPS = HIGH, FE/HCLK serves as a frame evaluation input to measure skew between incoming streams and the reference frame pulse. Measured offsets (up to +4.5 CLK cycles at ≤8 Mb/s) are stored in Frame Offset Registers (FOR0–FOR7) and applied per-stream to align output framing - critical for distributed switching systems with variable interconnect delays.

Can the 72V71643DA operate in both Variable and Constant Delay modes simultaneously?

Yes - the 72V71643DA supports per-channel delay mode selection via MOD1/MOD0 bits in Connection Memory. One channel can be configured for Variable Delay (MOD1–MOD0 = 0x0) to minimize voice latency, while another uses Constant Delay (MOD1–MOD0 = 0x1) to preserve frame integrity for data traffic. This hybrid operation is enabled by independent programming of each of the 4,096 Connection Memory locations, allowing mixed-traffic TDM switches to optimize QoS per service type.

What is the function of the TX16/OEI0–TX31/OEI15 pins on the 72V71643DA?

These 16 pins serve dual roles: as TX16–TX31 serial outputs (default) or as OEI0–OEI15 output enable indicators. When the OEI bit in the Control Register is set to 1, they reflect the real-time three-state/active status of TX0–TX15 - useful for external bus arbitration. When OEI = 0, they function as full TX outputs. For full 32-stream OE indication, two 72V71643DA devices must be used in tandem with AOE bit enabled on one device to generate OEI0–OEI31.

Does the 72V71643DA require external pull-up resistors on any pins?

Yes - the DTA (Data Transfer Acknowledgment) pin requires an external pull-up resistor to maintain HIGH when in high-impedance state after bus cycle completion. Additionally, TMS, TDI, and TRST pins have internal pull-ups but may benefit from external 4.7 kΩ pull-ups for noise immunity in electrically noisy telecom environments. All other I/O pins (except those three) are 5 V tolerant and do not require external termination for voltage translation.