Renesas R1QEA7218ABG-19IB0

Overview

R1QEA7218ABG-19IB0 from Renesas Electronics is a 72-Mbit DDR II+ synchronous SRAM with 4,194,304-word × 18-bit organization, 2-word burst, 533 MHz max clock frequency, 2.5-cycle read latency, and on-die termination (ODT). It operates at 1.8 V core (VDD) and 1.4–1.5 V I/O (VDDQ), using HSTL I/O and DLL/PLL timing circuitry for high-speed data capture in network packet buffers.

For engineers reviewing the R1QEA7218ABG-19IB0 datasheet, R1QEA7218ABG-19IB0 pinout, R1QEA7218ABG-19IB0 application, or R1QEA7218ABG-19IB0 equivalent, this device supports precise DDR timing via K//K clocks, provides echo clocks (CQ//CQ) and QVLD for data-valid indication, and requires ZQ calibration for output impedance matching in high-speed memory subsystems.

Technical Context

This DDR II+ SRAM uses double-data-rate pipelined operation synchronized to rising edges of complementary K and /K clocks only-no C//C pins are present per R1QE series specification. Its internal burst counter and address registry support linear 2-word bursts with SA0/SA1 enabling random start addresses.

The device integrates on-die termination controlled by ODT pin and ZQ reference resistor, with ODT automatically enabled during input cycles and disabled during output cycles. DLL/PLL circuitry ensures wide data valid window and supports frequency scaling up to 533 MHz, while /DOFF allows DLL/PLL bypass for low-frequency operation.

Key Specifications

Pinout & Package

Package: 165-ball FBGA (15 mm × 17 mm × 1.4 mm, ball pitch 0.8 mm), Pb-free, industrial temperature grade (−40°C to +85°C).

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 CY7C2665KV18, R1QEA7218ABG-19IB0 uniquely combines industrial temperature operation, HSTL I/O, and ZQ-calibrated ODT in a 165-ball FBGA - enabling robust, high-density memory subsystems without external termination or level-shifting components.

Availability

R1QEA7218ABG-19IB0 is available at Aetrix Electronics and suitable for network packet buffers, telecom line cards, and industrial real-time controllers requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for R1QEA7218ABG-19IB0 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 targets high-speed networking and communications equipment, delivering DDR II+ SRAMs optimized for deterministic latency, signal integrity at >500 MHz, and industrial reliability without external timing components.

FAQ

What is the maximum operating frequency of the R1QEA7218ABG-19IB0?

The R1QEA7218ABG-19IB0 supports a maximum clock frequency of 533 MHz, corresponding to a minimum cycle time of 1.875 ns. This rating is validated under industrial temperature conditions (−40°C to +85°C) and requires strict adherence to VDD/VDDQ supply sequencing and HSTL signal integrity guidelines. The device achieves this speed using integrated DLL/PLL circuitry and echo clocks (CQ//CQ) for source-synchronous data capture.

Does the R1QEA7218ABG-19IB0 support on-die termination (ODT)?

Yes, the R1QEA7218ABG-19IB0 includes on-die termination (ODT) controlled by the ODT pin and calibrated via the ZQ pin. When enabled, ODT provides programmable Thevenin termination (52–150 Ω) that tracks the external ZQ resistor value. For R1QEA7218ABG-19IB0, ODT is automatically activated during write cycles and deactivated during read cycles - eliminating the need for external termination resistors on the data bus.

What is the function of the QVLD pin on the R1QEA7218ABG-19IB0?

The QVLD (Q Valid) pin on the R1QEA7218ABG-19IB0 is an output signal that indicates when read data on DQ0–DQ17 is valid. It asserts half a clock cycle before the first data word and deasserts half a cycle before the last, aligning precisely with CQ//CQ edges. This enables FPGA or ASIC receivers to open and close their capture windows deterministically - a key feature for reliable high-speed data acquisition without complex deskew logic.

What package type and dimensions does the R1QEA7218ABG-19IB0 use?

The R1QEA7218ABG-19IB0 uses a 165-ball fine-pitch ball grid array (FBGA) package measuring 15 mm × 17 mm × 1.4 mm with 0.8 mm ball pitch. It is Pb-free and qualified for industrial temperature operation (−40°C to +85°C). The package marking includes "R1QEA7218ABG-19IB0 PB-F" to indicate RoHS-6 compliance and industrial grade, and it requires reflow soldering per J-STD-020 moisture sensitivity level 3.

How does the R1QEA7218ABG-19IB0 handle clock initialization and DLL/PLL locking?

The R1QEA7218ABG-19IB0 requires a 20 µs clock stabilization period after VDDQ and VREF reach regulation, during which K and /K must run continuously. Unlike earlier QDR-II devices, it does not require C//C clocks - K//K serve as both input and output timing references. If /DOFF is held high, the internal DLL/PLL locks automatically; if /DOFF is low, DLL/PLL is bypassed for stable low-frequency operation (<120 MHz), but full-speed performance requires /DOFF high and valid ZQ calibration.