Renesas R1QAA7218ABB-20IA0

Overview

R1QAA7218ABB-20IA0 from Renesas Electronics is a 72-Mbit QDR™ II+ SRAM with 4,194,304-word × 18-bit organization, synchronous quad data rate operation, 2.5-cycle read latency, and 165-pin FBGA (13 × 15 mm) packaging. It operates at 500 MHz max frequency (2 ns cycle time), supports HSTL I/O at 1.5 V VDDQ, and integrates burst counter, DLL/PLL, and JTAG 1149.1 test access - deployed in high-bandwidth packet buffering for network switches.

For engineers reviewing the R1QAA7218ABB-20IA0 datasheet, R1QAA7218ABB-20IA0 pinout, R1QAA7218ABB-20IA0 application, or R1QAA7218ABB-20IA0 equivalent, key selection criteria include burst-of-4 timing alignment, ODT absence (R1QAA variant), industrial temperature range (−40°C to +85°C), and K/K̅-synchronized dual-edge data capture on read/write cycles.

Technical Context

This device implements a true separate I/O architecture with independent read and write ports, enabling concurrent transactions without bus arbitration. Its synchronous interface latches all address and control inputs on the rising edge of K and /K, while data is registered on both rising edges of K and /K - delivering 100% DDR bus utilization.

The internal burst counter generates sequential addresses for four-word bursts, reducing external address bus frequency by 4×. Clock-stop capability with microsecond restart and DLL/PLL bypass via /DOFF support flexible system-level power management and low-frequency initialization sequences.

Key Specifications

Pinout & Package

Package: 165-pin plastic FBGA (13 × 15 × 1.4 mm), RoHS-compliant, Pb-free tray packaging (BB suffix). Pinout validated per Renesas datasheet R10DS0169EJ0011, Page 4 (R1QAA7218 top-view layout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2665KV18-500BZXC and IS42S32800J-5BL, R1QAA7218ABB-20IA0 delivers guaranteed concurrent access, K/K̅-only timing simplicity, and QVLD-assisted capture - making it optimal for deterministic, high-throughput embedded buffering where pin compatibility and timing predictability are mandatory.

Availability

R1QAA7218ABB-20IA0 is available at Aetrix Electronics and suitable for network switch buffering, baseband processing, automotive ADAS interprocessor communication, and broadcast video line buffering requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for R1QAA7218ABB-20IA0 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, power, and memory solutions for industrial, automotive, and communications markets.

The R1QAA72 series targets high-speed packet infrastructure applications, delivering deterministic QDR II+ performance with industrial temperature qualification and simplified synchronous interface design.

FAQ

What is the maximum operating frequency of the R1QAA7218ABB-20IA0?

The R1QAA7218ABB-20IA0 is rated for a maximum operating frequency of 500 MHz, corresponding to a 2 ns clock cycle time. This specification is validated under industrial temperature conditions (−40°C to +85°C) and requires strict adherence to setup/hold timing around the K and /K rising edges. The "-20" speed grade in the part number explicitly denotes this 500 MHz rating.

Does the R1QAA7218ABB-20IA0 support on-die termination (ODT)?

No, the R1QAA7218ABB-20IA0 does not support on-die termination. Per Renesas part numbering convention, the "A" in position 4 indicates no ODT (R1QDA7218ABB would be the ODT-enabled variant). This device relies on external termination and ZQ-calibrated output drivers for impedance matching, simplifying layout for systems where ODT control complexity is undesirable.

What is the function of the QVLD pin on the R1QAA7218ABB-20IA0?

The QVLD (Q Valid) pin on the R1QAA7218ABB-20IA0 is an output that signals when read data on Q0–Q17 is valid. It asserts half a clock cycle before the first data word and deasserts half a cycle after the last, aligning precisely with CQ and /CQ edges. This enables precise enable/disable windowing in high-speed receivers, reducing timing margining effort compared to strobe-based capture schemes.

How is burst addressing handled internally in the R1QAA7218ABB-20IA0?

The R1QAA7218ABB-20IA0 implements a fixed four-word burst. Upon /R or /W assertion, the internal burst counter increments the latched SA address by 1 for each subsequent word, generating sequential addresses SA, SA+1, SA+2, SA+3 automatically. This eliminates the need for external address increment logic and reduces bus bandwidth requirements by 75% versus single-word access.

What voltage supplies are required for proper operation of the R1QAA7218ABB-20IA0?

The R1QAA7218ABB-20IA0 requires two independent supplies: VDD = 1.7–1.9 V (nominal 1.8 V) for core logic, and VDDQ = 1.4–1.5 V (nominal 1.5 V) for I/O buffers. VREF must be supplied at nominally VDDQ/2 (0.68–0.95 V). Power-up sequencing mandates VSS → VDD → VDDQ/VREF → VIN to prevent latch-up and ensure reliable initialization.