Renesas 72V71660BB

Overview

IDT72V71660BB from Integrated Device Technology is a 3.3 V, 16,384 × 16,384 non-blocking time slot interchange (TSI) digital switch optimized for TDM voice/data infrastructure. It supports 64 serial input/output streams at data rates up to 16.384 Mb/s, features per-channel variable/constant delay modes, automatic ST-BUS®/GCI interface detection, and JTAG test access. Used in carrier-grade voice switching systems requiring precise frame-aligned channel routing.

For engineers reviewing the IDT72V71660BB datasheet, IDT72V71660BB pinout, IDT72V71660BB application, or IDT72V71660BB equivalent, key selection criteria include serial data rate scalability (2.048–16.384 Mb/s), per-stream frame offset programming, microprocessor-accessible connection memory, and industrial-temperature PBGA packaging with 208-ball 1 mm pitch.

Technical Context

The IDT72V71660BB implements a dual-mode TSI architecture: Variable Delay Mode achieves minimum 3-time-slot throughput for low-latency voice paths, while Constant Delay Mode guarantees fixed +1-frame +1-channel latency (e.g., 256 + (256 − n) + m time-slots at 16.384 Mb/s) to preserve frame integrity in wideband data applications. Its internal Data Memory stores incoming RX streams synchronized to an 8 kHz frame pulse (125 μs), and Connection Memory maps output channels to input source addresses with MOD1–0 control bits selecting mode per channel.

Frame alignment is managed via hardware-assisted evaluation: the FE/HCLK pin serves as frame measurement input in ST-BUS®/GCI mode, enabling automatic skew compensation up to +7.5 CLK periods in 0.5-cycle resolution using Frame Offset Registers. The device integrates IEEE-1149.1 JTAG for boundary-scan testing and supports memory block programming to initialize all Connection Memory high bits in two frames.

Key Specifications

Pinout & Package

Available in 208-pin Plastic Ball Grid Array (PBGA) package, 17 mm × 17 mm, 1 mm ball pitch (order code BB). Pinout defined per datasheet DSC-5905/10, top-view ball map with A1 corner marked.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V71660BB, IDT72V71260BB offers scaled-down capacity and speed in identical packaging for cost-sensitive E1 gateways, while PM73120 extends functionality with integrated framing logic at the expense of higher pin count and external clock dependency.

Availability

IDT72V71660BB is available at Aetrix Electronics and suitable for VoIP media gateways, digital loop carrier systems, SS7 signaling gateways, and wireless base station controllers requiring stable component supply across extended product lifecycles.

Supply support for IDT72V71660BB 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, designs high-performance timing, memory interface, and communications ICs for telecom, computing, and industrial markets.

IDT72V71660BB belongs to IDT's time slot interchange (TSI) product line, engineered specifically for carrier-class TDM switching infrastructure requiring deterministic latency, frame integrity, and multi-rate serial interface flexibility.

FAQ

What is the maximum serial data rate supported by the IDT72V71660BB?

The IDT72V71660BB supports serial data rates of 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s, and 16.384 Mb/s on all 64 RX and TX streams. At 16.384 Mb/s, it delivers full 16,384 × 16,384 non-blocking switching capacity. The master clock (CLK) must be set to 16.384 MHz for this rate, with DR1–0 bits in the Control Register configured accordingly.

How does the IDT72V71660BB handle input stream skew across long backplane traces?

The IDT72V71660BB uses its Frame Evaluation (FE/HCLK) input and Frame Offset Registers to measure and compensate for skew. Each RX stream can be individually offset by +0 to +7.5 CLK periods in 0.5-cycle steps. This is critical for systems where serial paths have mismatched lengths, ensuring all inputs align to the same frame boundary before switching.

Can the IDT72V71660BB operate in both Variable and Constant Delay Modes simultaneously?

Yes - the IDT72V71660BB supports per-channel delay mode selection via MOD1–0 bits in Connection Memory. One output channel can use Variable Delay Mode (MOD1–0 = 00) for low-latency voice, while another uses Constant Delay Mode (MOD1–0 = 01) to preserve frame integrity for data, all within the same device instance.

What is the function of the ODE pin on the IDT72V71660BB?

The ODE (Output Drive Enable) pin is an active-low global control that forces all TX outputs into high-impedance when asserted (LOW) and OSB = 0 in the Control Register. It acts as a hardware safety latch during initialization or fault conditions, overriding per-channel OE settings in Connection Memory until the system is fully configured.

Does the IDT72V71660BB require external memory for operation?

No - the IDT72V71660BB integrates all required memory on-die: 16,384 × 16-bit Data Memory for serial stream buffering and 16,384 × 16-bit Connection Memory for channel mapping. The microprocessor accesses both via its 16-bit parallel bus (A0–A15, D0–D15); no external RAM or ROM is needed for basic TSI operation.