Renesas 72V90823BCG

Overview

IDT72V90823BCG from Integrated Device Technology is a 3.3 V, 2,048 × 2,048 non-blocking time slot interchange (TSI) digital switch for ST-BUS®/GCI and wide frame pulse (WFP) interfaces. It supports serial data rates of 2.048 Mb/s, 4.096 Mb/s, or 8.192 Mb/s with corresponding master clock inputs of 4.096 MHz, 8.192 MHz, or 16.384 MHz, and delivers per-channel variable or constant throughput delay in voice and wideband data telecom switching applications.

For engineers reviewing the IDT72V90823BCG datasheet, IDT72V90823BCG pinout, IDT72V90823BCG application, or IDT72V90823BCG equivalent, key selection criteria include frame offset calibration capability, JTAG-compliant IEEE-1149.1 test port, 5V-tolerant I/O (except TMS/TDI/TRST), microprocessor interface mode flexibility (Intel/Motorola multiplexed/non-multiplexed), and per-channel high-impedance output control via ODE and connection memory bits.

Technical Context

The IDT72V90823BCG implements a dual-mode serial interface supporting both ST-BUS®/GCI (auto-detected polarity) and WFP alignment modes, with FE/HCLK used for frame evaluation in ST-BUS®/GCI mode and HCLK required for frame alignment in WFP mode. Its internal architecture includes 8 KHz frame boundary generation from F0i, serial-to-parallel and parallel-to-serial conversion, 2,048-byte data memory, and connection memory with five per-channel control bits (PC, V/C, OE, LPBK, CCO).

Switching configuration is determined by DR0–DR1 bits in the IMS register, selecting 512×512 @ 2.048 Mb/s, 1,024×1,024 @ 4.096 Mb/s, or 2,048×2,048 @ 8.192 Mb/s capacity. Input frame offset calibration compensates for inter-stream skew up to +4.5 CLK periods in 0.5-cycle resolution, while loopback control enables per-channel TX→RX diagnostic routing without external hardware.

Key Specifications

Pinout & Package

Package: 100-pin Ball Grid Array (BGA), 1 mm pitch, 11 mm × 11 mm footprint (order code BC). Pinout validated per IDT DSC-5712/4 datasheet Figure 2 (BC100-1 top view) and Pin Description Table (pages 4–5).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V90823BCG, IDT72V90821BCG offers identical interface compatibility and reduced capacity at lower cost, while CY7C68013A-56PVXC requires significant firmware and FPGA development to emulate basic TSI behavior - making IDT72V90823BCG the only drop-in solution for production telecom switching hardware.

Availability

IDT72V90823BCG is available at Aetrix Electronics and suitable for telecom infrastructure, wireless base station backhaul, distributed media gateways, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for IDT72V90823BCG 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, designed high-performance timing, memory interface, and telecom ICs for communications infrastructure and computing markets.

IDT72V90823BCG belongs to IDT's time slot interchange (TSI) digital switch product line, engineered specifically for carrier-grade ST-BUS®/GCI and WFP-based voice/data switching systems requiring deterministic latency, frame integrity, and multi-standard interoperability.

FAQ

What is the maximum serial data rate supported by the IDT72V90823BCG?

The IDT72V90823BCG supports a maximum serial data rate of 8.192 Mb/s, achieved when DR0=0 and DR1=1 in the IMS register. At this rate, it operates with 16 RX and 16 TX streams, each carrying 128 × 64 kbit/s channels per 125 µs frame, requiring a 16.384 MHz master clock (CLK) input. Lower rates of 4.096 Mb/s and 2.048 Mb/s are also supported with corresponding scaling of channel count and clock frequency.

How does the IDT72V90823BCG handle frame synchronization for mixed ST-BUS® and GCI interfaces?

The IDT72V90823BCG automatically detects and identifies frame synchronization polarity and format on the F0i input pin when WFPS is LOW. In ST-BUS® mode, it samples on falling edges of CLK; in GCI mode, on rising edges - all without software configuration. This auto-detection ensures seamless interoperability across heterogeneous telecom equipment without manual register setup or external logic.

Can the IDT72V90823BCG operate in both variable and constant throughput delay modes simultaneously?

Yes - the IDT72V90823BCG supports per-channel selection of variable or constant throughput delay via the V/C bit in each location of its connection memory. One channel may use variable delay (for minimal voice latency), while another uses constant delay (to preserve frame-aligned data integrity), all within the same device and frame cycle - enabling hybrid voice/data switching on a single chip.

What is the function of the ODE pin on the IDT72V90823BCG, and how does it interact with per-channel output control?

The ODE (Output Drive Enable) pin on the IDT72V90823BCG is a global enable for TX0–TX15 serial output drivers. When ODE is LOW and the OSB bit in the IMS register is LOW, all TX outputs enter high-impedance state. When ODE is HIGH, per-channel OE bits in the connection memory determine individual TX driver states - allowing hierarchical control: ODE for system-level shutdown, OE bits for selective channel muting.

Is the IDT72V90823BCG compatible with 5V microprocessors despite its 3.3V supply?

Yes - all I/O pins of the IDT72V90823BCG (except TMS, TDI, and TRST) are 5V tolerant, enabling direct connection to legacy 5V microprocessors such as Motorola 68K or Intel 80C188 without level-shifting circuitry. The device itself operates from a +3.3 V ± 0.3 V supply, and internal logic remains 3.3V-compatible while safely accepting 5V signaling on address, data, and control lines.