Renesas R1QEA7236ABB-20IB0

Overview

R1QEA7236ABB-20IB0 from Renesas Electronics is a 72-Mbit DDR II+ synchronous SRAM with 2,097,152-word × 36-bit organization, 2.5-cycle read latency, 500 MHz max clock frequency (2 ns cycle time), and HSTL I/O interface operating at 1.5 V VDDQ. It delivers pipelined double data rate operation in a 165-ball FBGA (13 × 15 × 1.4 mm) for high-bandwidth memory buffering in network packet processors.

For engineers reviewing the R1QEA7236ABB-20IB0 datasheet, R1QEA7236ABB-20IB0 pinout, R1QEA7236ABB-20IB0 application, or R1QEA7236ABB-20IB0 equivalent, this device requires attention to its DDR II+ burst timing, ODT-enabled termination control, QVLD-valid-data signaling, and industrial-temperature (−40°C to +85°C) operation under 1.8 V core supply.

Technical Context

This DDR II+ SRAM uses dual-edge clocking on K and /K for address/control latching and data capture, with no separate C/C̅ pins-unlike QDR II devices. Its DLL/PLL circuitry enables wide output data valid windows and supports future frequency scaling up to 500 MHz.

The device implements on-die termination (ODT) controlled by the ODT pin and ZQ calibration resistor, supporting Thevenin-equivalent termination ranges of 52–105 Ω (low range) or 105–150 Ω (high range). QVLD provides half-cycle-advanced valid-data indication edge-aligned with CQ and /CQ outputs.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, Pb-free, RoHS-compliant (BB suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT 72T36115L10BQI and Cypress CY7C2663KV18-500BZXC, the R1QEA7236ABB-20IB0 uniquely combines 500 MHz DDR II+ operation, industrial temperature rating, integrated ODT, and QVLD timing aid - enabling robust, high-density buffering without external termination or complex clock management.

Availability

R1QEA7236ABB-20IB0 is available at Aetrix Electronics and suitable for network packet buffering, baseband processing, high-speed data acquisition, and real-time video frame storage requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for R1QEA7236ABB-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 global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The R1QEA72 series is part of Renesas' high-performance DDR II+ SRAM product line, designed specifically for low-latency, high-bandwidth buffering in networking, telecom, and test equipment where deterministic timing and signal integrity are critical.

FAQ

What is the maximum operating frequency and corresponding cycle time for R1QEA7236ABB-20IB0?

R1QEA7236ABB-20IB0 supports a maximum clock frequency of 500 MHz, corresponding to a minimum cycle time of 2.0 ns. This specification is validated under industrial temperature conditions (−40°C to +85°C) with VDD = 1.8 V and VDDQ = 1.5 V, and assumes proper DLL/PLL lock and stable K//K clock signals meeting jitter and duty cycle requirements per the datasheet.

Does R1QEA7236ABB-20IB0 support on-die termination (ODT), and how is it configured?

Yes, R1QEA7236ABB-20IB0 supports ODT via the dedicated ODT pin and ZQ calibration input. When ODT is enabled (ODT pin high), it selects a high-range Thevenin termination (105–150 Ω); when low, it selects low-range (52–105 Ω). The actual resistance tracks the ZQ-set value (RQ), and ODT is automatically activated during read operations on the common I/O bus - no software control required.

What is the function of the QVLD pin on R1QEA7236ABB-20IB0, and how does it aid system timing?

The QVLD pin on R1QEA7236ABB-20IB0 is a synchronous output that asserts half a clock cycle before the first valid read data appears on DQ and deasserts half a cycle before the last valid data. Edge-aligned with CQ and /CQ, QVLD provides unambiguous, jitter-immune indication of the data valid window - eliminating setup/hold margin uncertainty in FPGA or ASIC capture logic and reducing timing closure effort.

What package type and dimensions does R1QEA7236ABB-20IB0 use, and is it RoHS-compliant?

R1QEA7236ABB-20IB0 uses a 165-ball Fine-Pitch Ball Grid Array (FBGA) package measuring 13 mm × 15 mm × 1.4 mm. The BB suffix confirms the 13×15 mm footprint and Pb-free construction. It meets RoHS Directive 2011/65/EU (6/6 compliance) and is marked with "PB-F" for Pb-free identification per Renesas marking conventions.

How does the burst length and latency of R1QEA7236ABB-20IB0 impact its use in real-time systems?

R1QEA7236ABB-20IB0 implements a fixed 2-word burst length with 2.5-cycle read latency, minimizing transaction overhead and guaranteeing predictable access timing. In real-time systems like packet switching or video buffering, this ensures deterministic worst-case latency for every read - critical for deadline-constrained scheduling and eliminating variable pipeline stalls caused by longer or configurable bursts.