Renesas 72V71660BBG

Overview

IDT72V71660BBG from Integrated Device Technology is a 3.3 V, 16,384 × 16,384 non-blocking time slot interchange (TSI) digital switch for TDM voice/data systems. 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 telephony switching fabric and PCM multiplexing equipment.

For engineers reviewing the IDT72V71660BBG datasheet, IDT72V71660BBG pinout, IDT72V71660BBG application, or IDT72V71660BBG equivalent, key selection criteria include frame-aligned throughput delay control, microprocessor-accessible connection memory, per-stream input offset calibration, and 208-pin PBGA package compatibility with industrial temperature operation (–40°C to +85°C).

Technical Context

The IDT72V71660BBG implements a dual-mode TSI architecture: Variable Delay Mode achieves minimum 3-time-slot latency for voice paths, while Constant Delay Mode guarantees fixed 1-frame-plus-1-channel delay (e.g., 256 + (256 − n) + m time-slots at 16.384 Mb/s) to preserve frame integrity in data applications. Its internal Data Memory stores incoming RX stream data, and Connection Memory maps output channels to input source addresses with MOD1–0 bits selecting mode per channel.

Frame alignment is managed via dedicated hardware: FE/HCLK serves as frame evaluation input or HCLK clock depending on WFPS state; FP accepts ST-BUS®/GCI frame pulses; WFPS selects between wide-frame pulse and ST-BUS®/GCI modes. Input skew compensation uses programmable frame offset registers (FOR) with ±7.5 CLK resolution in half-cycle steps.

Key Specifications

Pinout & Package

Package: 208-pin Plastic Ball Grid Array (PBGA), 17 mm × 17 mm, 1.0 mm pitch (order code BB). Pinout conforms to IDT72V71660 functional specification with dedicated RX/TX banks, microprocessor bus, JTAG, and control signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V71260BBG, the IDT72V71660BBG delivers double switching capacity without changing board layout or software driver-ideal for scalable telecom platforms. Versus PM73120, it provides pure TSI functionality with lower complexity, power, and cost where packet processing is handled externally.

Availability

IDT72V71660BBG is available at Aetrix Electronics and suitable for telecom infrastructure, carrier-grade switching fabric, and industrial TDM equipment requiring stable component supply across long product lifecycles.

Supply support for IDT72V71660BBG 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, specialized in high-performance timing, memory interface, and communications ICs for networking and telecom markets.

The IDT72V71660BBG belongs to IDT's TSI digital switch family, engineered specifically for carrier-class TDM time slot interchange in voice/data multiplexers, central office switches, and radio access networks.

FAQ

What is the maximum data rate supported by the IDT72V71660BBG on each serial stream?

The IDT72V71660BBG supports serial data rates of 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s, or 16.384 Mb/s per RX/TX stream. At 16.384 Mb/s, the master clock (CLK) runs at 16.384 MHz with one bit per clock edge; at lower rates, CLK operates at twice the data rate with two clocks per bit. This is configured via DR1–0 bits in the Control Register.

How does the IDT72V71660BBG handle input stream skew across its 64 RX channels?

The IDT72V71660BBG compensates for inter-stream skew using its Frame Evaluation (FE/HCLK) input and Frame Offset Registers (FOR). Each RX stream can be individually delayed up to +7.5 CLK periods in 0.5-cycle increments. Skew measurement is automated: setting the Start Frame Evaluation bit initiates a two-frame calibration cycle that writes the measured offset into the Frame Alignment Register.

Can the IDT72V71660BBG operate in both ST-BUS® and GCI interface modes simultaneously?

No-the IDT72V71660BBG automatically detects and locks to either ST-BUS® or GCI frame format based on the FP input signal, but it cannot process both formats concurrently. The WFPS pin selects the operational mode: LOW enables ST-BUS®/GCI auto-detection, HIGH enables Wide Frame Pulse mode. Once detected, the device configures its internal timing accordingly.

What is the function of the TX32–TX63 pins when Output Enable Indication is enabled?

When the OEI bit (bit 14) in the Control Register is set to 1, the TX32–TX63 pins cease functioning as data outputs and instead indicate the active/high-Z state of their corresponding TX0–TX31 outputs. For example, TX32 reflects OEI0 status: logic HIGH means TX0 is actively driving, LOW means TX0 is in high-impedance. This enables real-time hardware monitoring of output driver states.

Does the IDT72V71660BBG require external memory for configuration or operation?

No-the IDT72V71660BBG contains all necessary internal memory: 16,384 × 16-bit Data Memory for incoming stream storage and 16,384 × 16-bit Connection Memory for path mapping. Configuration is performed via its 16-bit microprocessor interface (A0–A15, D0–D15), and no external RAM or Flash is needed for normal operation or initialization.