Renesas 72T72115L5BB

Overview

IDT72T72115L5BB from Integrated Device Technology is a 131,072 × 72-bit, 2.5 V high-speed TeraSync™ FIFO with independent asynchronous/synchronous read and write ports, up to 225 MHz clock operation, HSTL/LVTTL I/O selectability, and programmable almost-empty/almost-full flags - deployed in network packet buffering, telecom line cards, and video frame synchronization systems.

For engineers reviewing the IDT72T72115L5BB datasheet, IDT72T72115L5BB pinout, IDT72T72115L5BB application, or IDT72T72115L5BB equivalent, key selection considerations include bus-matching (x72/x36/x18), FWFT vs. IDT Standard timing mode, Mark & Retransmit capability, JTAG boundary scan compliance, and PBGA-324 thermal/mechanical constraints for high-density PCB layouts.

Technical Context

The IDT72T72115L5BB implements a dual-clock, depth-expandable FIFO architecture with separate read/write pointer logic, RAM array (131,072 × 72), and configurable flag generation circuitry. It supports synchronous/asynchronous port timing independently per port, with programmable flag offsets loaded via serial (SCLK/SEN) or parallel (WCLK/WEN) interfaces.

Its control logic integrates Master Reset (MRS) and Partial Reset (PRS) paths, FWFT/SI mode selection, Big-Endian/Little-Endian byte ordering (via BE), and JTAG-compliant IEEE 1149.1 test access. The device uses submicron CMOS technology and auto-power-down to minimize standby current when idle.

Key Specifications

Pinout & Package

Package: 324-pin Plastic Ball Grid Array (PBGA), 19 mm × 19 mm, 1.0 mm pitch, BB variant, industrial temperature grade.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FIFO applications.

Compared with NB7L14M and 72V2115L15PF, the IDT72T72115L5BB uniquely delivers 2.5 V operation with HSTL I/O, FWFT timing, Mark & Retransmit, and full IEEE 1149.1 JTAG - making it optimal for next-gen telecom, video, and high-speed serial interface buffering where density, latency control, and testability are co-critical.

Availability

IDT72T72115L5BB is available at Aetrix Electronics and suitable for telecom infrastructure, high-speed networking equipment, broadcast video systems, and industrial real-time data acquisition requiring stable component supply across extended product lifecycles.

Supply support for IDT72T72115L5BB 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions.

The IDT72T72115L5BB belongs to the TeraSync™ FIFO product line, designed specifically for high-bandwidth, low-latency data buffering in multi-clock-domain systems such as optical transport networks, video processing pipelines, and packet-switched infrastructure.

FAQ

What is the maximum operating frequency of the IDT72T72115L5BB?

The IDT72T72115L5BB supports up to 225 MHz for both read and write clocks (RCLK and WCLK), enabling a minimum cycle time of 4.44 ns. This specification is guaranteed over the industrial temperature range (–40°C to +85°C) and 2.5 V ±5% supply, as confirmed in the DC and AC Electrical Characteristics tables of the official datasheet (DSC-5994/16, June 2017).

Does the IDT72T72115L5BB support both synchronous and asynchronous operation on its read and write ports?

Yes, the IDT72T72115L5BB supports independent synchronous or asynchronous timing on each port. ASYR and ASYW pins configure the read and write ports respectively during Master Reset. In synchronous mode, RCLK/REN and WCLK/WEN control transfers; in asynchronous mode, RD and WR strobes are used, with REN/WEN tied low. Asynchronous read requires IDT Standard timing mode.

How does the Mark & Retransmit feature work on the IDT72T72115L5BB?

The IDT72T72115L5BB implements Mark & Retransmit via MARK and RT pins. Asserting MARK (synchronized to RCLK) latches the current read pointer position. Subsequently asserting RT (on rising RCLK edge) resets the read pointer to that marked location - enabling hardware-accelerated retransmission of buffered data without CPU involvement or pointer arithmetic.

Can the IDT72T72115L5BB be used in a 3.3 V system?

No - the IDT72T72115L5BB is a 2.5 V core device (VCC = 2.5 V ±5%). While its inputs are 3.3 V tolerant, VCC must be supplied at 2.5 V. Driving outputs into a 3.3 V bus requires level-shifting or compatible receivers; VDDQ and VREF must be configured for the selected I/O standard (e.g., 1.8 V for HSTL), not 3.3 V.

What package type and ball count does the IDT72T72115L5BB use?

The IDT72T72115L5BB uses a 324-ball Plastic Ball Grid Array (PBGA) package with 1.0 mm pitch and 19 mm × 19 mm footprint, designated by the "BB" suffix in the part number. It is rated for industrial temperature operation (–40°C to +85°C) and complies with RoHS and green material requirements per IDT's ordering information.