Renesas 72V70190PFG

Overview

IDT72V70190PFG from Integrated Device Technology is a 3.3 V, 256 × 256 non-blocking time slot interchange (TSI) digital switch optimized for ST-BUS®/GCI telephony interfaces. It supports eight 2.048 Mb/s serial input/output streams, delivers per-channel variable or constant throughput delay (3–94 time-slots), and features 3.3 V I/O with 5 V tolerant inputs. Used in voice/data multiplexing systems requiring precise PCM channel routing and frame alignment calibration.

For engineers reviewing the IDT72V70190PFG datasheet, IDT72V70190PFG pinout, IDT72V70190PFG application, or IDT72V70190PFG equivalent, key selection criteria include ST-BUS®/GCI auto-detection, per-stream frame offset programming, microprocessor interface mode flexibility (Intel/Motorola multiplexed/non-multiplexed), and high-impedance output control via ODE/OSB bits - all critical for TDM switching in carrier-grade access equipment.

Technical Context

The IDT72V70190PFG implements a dual-mode TSI architecture with separate data memory (up to 256 bytes) and connection memory (256 × 16-bit locations), enabling both Connection Mode (source-address-based routing) and Processor Mode (direct time-slot write). Its timing unit synchronizes to an external 4.096 MHz master clock and 8 kHz F0i frame pulse, automatically detecting ST-BUS® (falling-edge frame sync) or GCI (rising-edge frame sync) formats.

Frame offset calibration uses the FE input to measure skew between RX streams and F0i, storing results in 12-bit FAR registers; programmable FOR registers then apply up to +4.5 CLK-period input delays per stream. The CCO output provides a 4.096 Mb/s bitstream derived from connection memory CCO bits, synchronized one time-slot ahead of TX data.

Key Specifications

Pinout & Package

Package: 64-pin Thin Plastic Quad Flatpack (TQFP), 14 mm × 14 mm, 0.80 mm pitch (order code PF). RoHS-compliant, commercial temperature grade.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC145506FN and Si2404-GM, the IDT72V70190PFG uniquely combines full E1-scale switching capacity, ST-BUS®/GCI auto-detection, and hardware-accelerated frame offset measurement - making it the only option for carrier-grade access systems requiring deterministic TDM timing and multi-stream synchronization.

Availability

IDT72V70190PFG is available at Aetrix Electronics and suitable for E1 line card design, VoIP gateway development, and carrier-class access node manufacturing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for IDT72V70190PFG 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 IDT72V70190PFG belongs to IDT's legacy TSI digital switch product line, engineered specifically for carrier-grade telephony infrastructure requiring precise PCM time-slot routing, frame alignment, and multi-protocol interface support.

FAQ

What is the primary function of the IDT72V70190PFG in a telecommunications system?

The IDT72V70190PFG serves as a 256 × 256 non-blocking time slot interchange switch that routes individual 64 kbit/s PCM channels between eight 2.048 Mb/s serial streams. It maintains frame integrity for data and minimizes throughput delay for voice, supporting both ST-BUS® and GCI framing standards. Its role is central to E1/T1 line cards, VoIP gateways, and access multiplexers where deterministic TDM switching is required.

How does the IDT72V70190PFG handle frame synchronization for ST-BUS® versus GCI interfaces?

The IDT72V70190PFG automatically detects whether the F0i input follows ST-BUS® (frame sync on falling edge of 8 kHz signal) or GCI (frame sync on rising edge) format. Based on this detection, it configures internal sampling edges: for ST-BUS®, data is latched on the rising edge of CLK three-quarters into the bit cell; for GCI, data is latched on the falling edge under the same timing rule. This eliminates manual configuration and ensures interoperability across legacy and modern telecom interfaces.

Can the IDT72V70190PFG compensate for skew between multiple input serial streams?

Yes, the IDT72V70190PFG provides hardware-based frame offset calibration using the FE (Frame Evaluation) input. By measuring the timing difference between each RX stream and the F0i frame pulse, it stores 12-bit offset values in the FAR register. These values are then applied via programmable FOR registers to delay individual input streams by up to +4.5 CLK periods (½-cycle resolution), correcting skew caused by unequal PCB trace lengths or backplane propagation delays.

What are the two throughput delay modes supported by the IDT72V70190PFG, and how do they differ?

The IDT72V70190PFG supports variable delay mode (V/C bit = 0) and constant delay mode (V/C bit = 1). In variable mode, delay depends only on source/destination channel numbers (3–32 time-slots), minimizing latency for voice. In constant mode, a multi-buffer architecture ensures fixed delay (32–94 time-slots) regardless of routing, preserving frame alignment for concatenated data channels like ISDN PRI. Both modes are selectable per channel via the connection memory.

Is the IDT72V70190PFG compatible with both Intel and Motorola microprocessor buses?

Yes, the IDT72V70190PFG supports Intel-style multiplexed (using RD/WR), Motorola-style multiplexed (using DS/RD and R/W), and Motorola-style non-multiplexed (using separate A0–A7 and AD0–AD7) interfaces. The IM pin selects multiplexed (IM = HIGH) or non-multiplexed (IM = LOW) operation, while internal logic resolves signal naming differences - eliminating external glue logic and simplifying host processor integration across diverse embedded platforms.