Renesas 72V71643BC

Overview

72V71643BC from Integrated Device Technology (IDT) is a 3.3 V, 4,096 × 4,096 non-blocking time slot interchange (TSI) digital switch IC designed for ST-BUS® and GCI-based telecommunication systems. It supports up to 32 serial input/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/constant delay modes and JTAG test access. It operates across –40°C to +85°C and uses 3.3 V I/O with 5 V tolerant inputs.

For engineers reviewing the 72V71643BC datasheet, 72V71643BC pinout, 72V71643BC application, or 72V71643BC equivalent, this page delivers verified technical context on rate-matching switching, frame alignment evaluation, microprocessor-accessible memory mapping, and output enable indication - all critical for TDM infrastructure design, voice/data multiplexing, and legacy telecom timing systems.

Technical Context

The 72V71643BC implements a dual-mode TSI architecture supporting Regular, Mux/Demux, and Split configurations via DR3–DR0 control bits. Its internal Data Memory stores incoming RX stream data synchronized to the 8 kHz F0i frame pulse, while Connection Memory defines per-channel routing, delay mode (MOD1–MOD0), loopback (LPBK), and output impedance control.

It features automatic ST-BUS®/GCI format detection, frame evaluation (FE/HCLK) for skew measurement, programmable frame offset registers (FOR0–FOR7), and IEEE-1149.1 JTAG test port (TCK/TMS/TDI/TDO/TRST). The device provides two microprocessor interface timing modes (asynchronous/synchronous), 15-bit address bus (A0–A14), and 16-bit bidirectional data bus (D0–D15) with DTA handshake signaling.

Key Specifications

Pinout & Package

72V71643BC is packaged in a 144-pin Ball Grid Array (BGA), order code BC144-1, with 1 mm pitch and 13 mm × 13 mm footprint. Pin functions are validated per IDT datasheet DSC-5902/5, Figure drw02 (BGA top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V71642BC and CY7C68013A, the 72V71643BC uniquely delivers full 16.384 Mb/s support with hardware-accelerated frame evaluation, per-stream offset programming, and integrated JTAG - making it irreplaceable in carrier-grade TDM switching where deterministic delay, multi-rate interoperability, and production testability are mandatory.

Availability

72V71643BC is available at Aetrix Electronics and suitable for central office switches, multi-service access platforms, VoIP gateway timing interfaces, and TDM-over-IP edge routers requiring stable component supply across extended product lifecycles.

Supply support for 72V71643BC 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 72V71643BC belongs to IDT's legacy TSI digital switch family, engineered specifically for carrier-class TDM infrastructure requiring non-blocking channel switching, multi-rate rate matching, and precise frame-aligned delay control in E1/T1/STM-1 systems.

FAQ

What is the maximum data rate supported by the 72V71643BC?

The 72V71643BC supports a maximum serial data rate of 16.384 Mb/s on all 32 RX and TX streams. At this rate, the master clock (CLK) must be 16.384 MHz, and data is clocked on the rising edge for GCI mode or falling edge for ST-BUS® mode. This enables direct interfacing with STM-1 tributary signals and high-density TDM backplanes. Lower rates (2.048/4.096/8.192 Mb/s) use a 2× CLK frequency for dual-bit-per-cycle operation.

Does the 72V71643BC support both ST-BUS® and GCI serial formats?

Yes, the 72V71643BC automatically detects and identifies incoming frame pulses as either ST-BUS® or GCI based on signal polarity and timing. The F0i input accepts both formats, and the FE/HCLK pin adapts its evaluation behavior accordingly - measuring falling-edge alignment in ST-BUS® mode and rising-edge alignment in GCI mode. No software configuration is required for format detection.

How does the frame offset evaluation feature work in the 72V71643BC?

The 72V71643BC uses the FE/HCLK input and frame alignment register (FAR) to measure skew between incoming RX streams and the F0i frame pulse. Setting the SFE bit initiates a two-frame measurement cycle; the CFE bit then indicates readiness, and FAR[11:0] holds the measured offset in half-clock-cycle increments. This value is used to program FOR0–FOR7 registers for per-stream alignment compensation - critical for maintaining synchronization across distributed TDM paths.

Can the 72V71643BC operate in a system with mixed input and output data rates?

Yes, the 72V71643BC supports mixed-rate operation through its Mux/Demux and Split modes, configured via DR3–DR0 bits in the Control Register. In Mux/Demux mode, all RX streams run at one rate (e.g., 2.048 Mb/s) while all TX streams run at another (e.g., 8.192 Mb/s). In Split mode, half the RX streams use one rate and the other half use a second rate - with symmetrical TX rates. All configurations maintain non-blocking 4,096 × 4,096 switching.

What is the purpose of the ODE and OSB pins on the 72V71643BC?

The ODE (Output Drive Enable) pin and OSB (Output Standby) bit in the Control Register jointly control global three-state behavior of TX0–TX31 outputs. When both ODE = LOW and OSB = 0, all TX outputs enter high-impedance. Any other combination delegates output enable control to per-channel MOD1–MOD0 bits in Connection Memory. This dual-level control allows safe initialization (hold ODE LOW during boot) followed by fine-grained channel-by-channel activation.