Renesas R1QDA7236ABB-20IB0

Overview

R1QDA7236ABB-20IB0 from Renesas Electronics is a 72-Mbit (2,097,152-word × 36-bit) QDR™ II+ synchronous SRAM with 2.5-cycle read latency, on-die termination (ODT), and 165-pin FBGA (13 × 15 × 1.4 mm) packaging. It operates at up to 500 MHz (2.0 ns cycle time), supports HSTL I/O, and delivers concurrent read/write via separate data ports - ideal for high-bandwidth packet buffering in network switches and routers.

For engineers reviewing the R1QDA7236ABB-20IB0 datasheet, R1QDA7236ABB-20IB0 pinout, R1QDA7236ABB-20IB0 application, or R1QDA7236ABB-20IB0 equivalent, key selection criteria include burst-of-4 operation, ODT enable/disable control, QVLD timing indicator, K//K clocking architecture, and industrial temperature range (−40°C to +85°C).

Technical Context

This device implements a true quad-data-rate interface using independent read and write ports synchronized to K and /K clocks. All address, control, and data inputs are registered on rising edges of K and /K, while output data aligns with echo clocks CQ and /CQ - which are phase-matched to K//K since C//C pins are absent in QDR II+ series.

The internal architecture includes a burst counter, DLL/PLL circuitry for data valid window extension, programmable output impedance via ZQ resistor, and JTAG 1149.1 test access. ODT functionality is controlled by the ODT pin and tracks RQ value, supporting Thevenin-equivalent termination ranges of 52–105 Ω (low mode) or 105–150 Ω (high mode).

Key Specifications

Pinout & Package

Package: 165-ball plastic FBGA (13 mm × 15 mm × 1.4 mm, ball pitch 0.8 mm), RoHS-compliant Pb-free with tray packaging.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar QDR II+ SRAM applications.

Compared with CY7C2663KV18-500BAXI and AS7C36S2048A-20BIN, R1QDA7236ABB-20IB0 uniquely combines 500 MHz QDR II+ performance with integrated ODT and QVLD - reducing system-level timing margining effort and eliminating external termination components required by the Cypress part, while outperforming the Alliance part by >2.5× in sustained bandwidth.

Availability

R1QDA7236ABB-20IB0 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, baseband processing memory, and test equipment pattern memory requiring stable component supply across extended product lifecycles.

Supply support for R1QDA7236ABB-20IB0 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

Renesas Electronics Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog devices, and high-performance memory solutions for industrial, automotive, and communications markets.

The R1QDA72 series belongs to Renesas' QDR II+ SRAM product line, engineered specifically for deterministic, high-bandwidth data buffering in carrier-grade networking and telecom infrastructure where low latency, burst efficiency, and signal integrity are critical.

FAQ

What is the maximum operating frequency of the R1QDA7236ABB-20IB0?

The R1QDA7236ABB-20IB0 supports a maximum operating frequency of 500 MHz, corresponding to a 2.0 ns clock cycle time. This is validated under industrial temperature conditions (−40°C to +85°C) and with VDD = 1.7–1.9 V and VDDQ = 1.4–1.5 V. Performance is guaranteed per AC timing specifications in the R10DS0169EJ0011 datasheet Rev. 0.11.

Does the R1QDA7236ABB-20IB0 support on-die termination (ODT)?

Yes, the R1QDA7236ABB-20IB0 includes on-die termination (ODT) controlled by the ODT pin. It supports two impedance ranges: low mode (52–105 Ω) and high mode (105–150 Ω), selected via ODT pin state and calibrated against the ZQ resistor. ODT is enabled during read operations and disabled during writes in this separate-I/O variant.

What is the purpose of the QVLD pin on the R1QDA7236ABB-20IB0?

The QVLD (Q Valid) pin on the R1QDA7236ABB-20IB0 signals the validity window of output data Q0–Q35. It asserts half a cycle before the first valid data edge and deasserts half a cycle after the final data edge, aligning precisely with CQ and /CQ echo clocks. This eliminates setup/hold uncertainty for high-speed receivers capturing QDR II+ outputs.

How is read latency defined for the R1QDA7236ABB-20IB0?

Read latency for the R1QDA7236ABB-20IB0 is fixed at 2.5 clock cycles, meaning the first valid output word appears 2.5 K-clock periods after the /R signal is sampled on a rising K edge. This latency is inherent to the QDR II+ architecture and affects timing budgeting for read-response paths in systems like network switches and baseband processors.

What package type and dimensions does the R1QDA7236ABB-20IB0 use?

The R1QDA7236ABB-20IB0 uses a 165-ball plastic FBGA package measuring 13 mm × 15 mm × 1.4 mm with 0.8 mm ball pitch. It is Pb-free and supplied in trays, meeting RoHS compliance level 6/6. Pin assignments follow the bottom-view layout documented for R1QD(K)A7236 in the R10DS0169EJ0011 datasheet.