Renesas 72V90823PQFG

Overview

IDT72V90823PQFG from Integrated Device Technology is a 3.3 V, 2,048 × 2,048 non-blocking time slot interchange (TSI) digital switch optimized for ST-BUS®/GCI and wide frame pulse (WFP) telecommunication interfaces. It supports serial data rates of 2.048 Mb/s, 4.096 Mb/s, or 8.192 Mb/s with per-channel variable or constant throughput delay, IEEE-1149.1 JTAG test port, and 5V-tolerant I/O - deployed in carrier-grade TDM switching systems requiring precise channel-level timing control.

For engineers reviewing the IDT72V90823PQFG datasheet, IDT72V90823PQFG pinout, IDT72V90823PQFG application, or IDT72V90823PQFG equivalent, key selection criteria include frame alignment evaluation capability, per-stream input offset programming, microprocessor interface mode flexibility (Intel/Motorola multiplexed/non-multiplexed), 3.3 V operation with 5V-tolerant pins, and support for broadcast via connection memory addressing.

Technical Context

The IDT72V90823PQFG implements a dual-mode serial interface: ST-BUS®/GCI auto-detection when WFPS = LOW, and WFP frame alignment when WFPS = HIGH. Its internal architecture includes parallel-to-serial and serial-to-parallel converters, 8 KB data memory, configurable connection memory, and independent frame input offset registers (FOR) for up to 16 RX streams.

It features two distinct delay modes per channel: variable delay (minimum 3 time-slots, preserves minimum voice latency) and constant delay (fixed 1-frame latency, maintains frame integrity for concatenated data). Delay configuration is controlled by the V/C bit in each connection memory location, while per-channel high-impedance output is managed via ODE pin and OSB register bit plus individual OE bits.

Key Specifications

Pinout & Package

Package: 100-pin Plastic Quad Flatpack (PQFP), 0.65 mm pitch, 14 mm × 20 mm footprint (order code PQF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V90823PQFG, the BC100 BGA variant offers identical functionality in a smaller footprint but requires PCB redesign, while the ZL50012 provides lower power and integrated clocking at the cost of WFP mode support and JTAG test infrastructure - making IDT72V90823PQFG optimal for field-upgradable, test-intensive carrier infrastructure.

Availability

IDT72V90823PQFG is available at Aetrix Electronics and suitable for telecom central office switching, wireless base station backhaul, VoIP gateway media processing, and SS7 signaling node applications requiring stable component supply across extended product lifecycles.

Supply support for IDT72V90823PQFG 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 telecom and networking infrastructure.

The IDT72V90823PQFG belongs to IDT's TSI digital switch product line, designed specifically for carrier-grade TDM time-division multiplexing systems requiring non-blocking channel routing, frame alignment calibration, and multi-standard interface support (ST-BUS®, GCI, WFP).

FAQ

What is the maximum serial data rate supported by the IDT72V90823PQFG?

The IDT72V90823PQFG supports a maximum serial data rate of 8.192 Mb/s, enabling full 2,048 × 2,048 non-blocking channel capacity. At this rate, it operates with a 16.384 MHz master clock (CLK), 128 time-slots per 125 µs frame, and requires WFPS = LOW for ST-BUS®/GCI mode or WFPS = HIGH with HCLK = 4.096 MHz for WFP mode. Lower rates - 4.096 Mb/s (1,024 × 1,024) and 2.048 Mb/s (512 × 512) - are selected via DR0/DR1 bits in the IMS register.

How does the IDT72V90823PQFG handle frame synchronization across multiple input streams?

The IDT72V90823PQFG uses its FE/HCLK pin to measure frame offset delay relative to the F0i input, storing results in the frame alignment register (FAR). Each of the 16 RX streams has an associated frame input offset register (FOR) that can be programmed to compensate for inter-stream skew up to ±4.5 master clock periods in 0.5-clock steps. This allows precise alignment of asynchronous TDM sources before switching, critical in distributed switching fabrics.

Can the IDT72V90823PQFG operate in both variable and constant delay modes simultaneously?

Yes - the IDT72V90823PQFG supports per-channel delay mode selection via the V/C bit in each location of its connection memory. Channels configured with V/C = 0 use variable delay (minimum 3 time-slots, ideal for voice), while those with V/C = 1 use constant delay (fixed 1-frame latency, essential for concatenated data). This hybrid operation enables mixed-traffic systems - e.g., voice channels routed with minimal latency alongside signaling or packetized data requiring strict frame coherency - within a single IDT72V90823PQFG device.

What microprocessor interface configurations does the IDT72V90823PQFG support?

The IDT72V90823PQFG supports Intel-style multiplexed, Motorola-style multiplexed, and Motorola-style non-multiplexed CPU buses. Interface mode is selected by the IM pin: LOW enables non-multiplexed mode (A0–A7 + AD0–AD7/D8–D15); HIGH enables multiplexed mode, where AS/ALE and DS/RD determine timing subtype. Control signal naming (R/W/WR, DS/RD, AS/ALE) is auto-adapted - eliminating external glue logic required to reconcile differing processor bus conventions.

Is the IDT72V90823PQFG pin-compatible with other members of the IDT72V90xx family?

No - the IDT72V90823PQFG is not pin-compatible with earlier IDT72V90xx variants such as the IDT72V9072 or IDT72V9092. While sharing architectural similarities and register-level compatibility in some functions, it features a unique 100-pin PQFP pinout with dedicated WFPS, CCO, and expanded JTAG signals. Migration requires PCB layout revision and firmware validation due to differences in connection memory mapping, delay mode implementation, and frame alignment register structure.