Renesas R1QDA3618CBG-19IB0

Overview

R1QDA3618CBG-19IB0 from Renesas Electronics is a 36-Mbit QDR™ II+ SRAM with 2,097,152-word × 18-bit organization, 4-word burst, read latency of 2.5 cycles, and on-die termination (ODT). It operates at up to 533 MHz (1.875 ns cycle time), uses 1.8 V core and 1.4–1.5 V I/O supplies, and targets high-bandwidth packet buffering in network switches and routers.

For engineers reviewing the R1QDA3618CBG-19IB0 datasheet, R1QDA3618CBG-19IB0 pinout, R1QDA3618CBG-19IB0 application, or R1QDA3618CBG-19IB0 equivalent, key selection criteria include confirmed ODT support, HSTL I/O compatibility, 165-pin FBGA (15 × 17 mm) package mapping, burst timing alignment with K/K̄ clocks, and QVLD-synchronized data capture for DDR-style interfaces.

Technical Context

This device implements synchronous quad data rate architecture with separate read/write data ports, dual-clock edge registration (K and K̄ rising edges for write data, CQ/CQ̄ for read data output timing), and integrated DLL for wide data valid window. It supports concurrent read/write transactions and uses burst-of-four addressing with internal address incrementing.

The R1QDA3618CBG-19IB0 features JTAG 1149.1 test access, programmable output impedance via ZQ calibration resistor, and ODT control with selectable Thevenin-equivalent termination (52–150 Ω). Its /DOFF pin enables DLL bypass for stable low-frequency operation, and QVLD provides half-cycle-advanced valid-data indication aligned to CQ/CQ̄ edges.

Key Specifications

Pinout & Package

Package: 165-ball plastic FBGA (15 mm × 17 mm, 1.4 mm height), RoHS-compliant, industrial temperature grade (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2663KV18-533BZXC and AS7C33618B-533BIN, the R1QDA3618CBG-19IB0 uniquely integrates ODT, QVLD, and ZQ calibration-reducing BOM count, improving signal integrity margin, and simplifying timing closure in high-speed systems without sacrificing bandwidth or latency.

Availability

R1QDA3618CBG-19IB0 is available at Aetrix Electronics and suitable for network infrastructure, high-speed test instrumentation, telecom baseband processing, and avionics data concentrators requiring stable component supply across extended product lifecycles.

Supply support for R1QDA3618CBG-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 management, and high-performance memory solutions for industrial, automotive, and communications markets.

The R1QDA3618CBG-19IB0 belongs to Renesas' QDR™ II+ SRAM product line, engineered specifically for deterministic, low-latency, high-throughput buffering in packet-switched networks and real-time signal processing systems.

FAQ

What is the maximum operating frequency and corresponding cycle time for R1QDA3618CBG-19IB0?

The R1QDA3618CBG-19IB0 supports a maximum clock frequency of 533 MHz, corresponding to a minimum cycle time of 1.875 ns. This specification is validated under industrial temperature conditions (−40°C to +85°C) and with proper power supply decoupling and signal integrity layout per Renesas' design guidelines. The R1QDA3618CBG-19IB0 achieves this performance using advanced CMOS process technology and integrated DLL circuitry.

Does R1QDA3618CBG-19IB0 support on-die termination (ODT), and how is it configured?

Yes, the R1QDA3618CBG-19IB0 includes on-die termination (ODT) with selectable low-range (52–105 Ω) or high-range (105–150 Ω) Thevenin-equivalent impedance. Configuration is controlled by the ODT pin level and the external ZQ resistor value (RQ). When ODT is enabled, its impedance tracks RQ per Renesas' published formulas - ensuring consistent termination without external components. This capability is confirmed in the device's ODT pin table and AC characteristics section.

What is the function of the QVLD pin on R1QDA3618CBG-19IB0, and how does it align with data output timing?

The QVLD (Q Valid) pin on R1QDA3618CBG-19IB0 indicates when output data on Q0–Q17 is valid. It asserts one-half clock cycle before the first read data word and deasserts one-half cycle before the last word in the 4-word burst. QVLD is edge-aligned with CQ and /CQ outputs - providing a precise, jitter-immune timing reference for external latches or FPGA capture logic. This feature is explicitly documented in the R1QDA3618CBG-19IB0's pin descriptions and timing diagrams.

What package type and dimensions does R1QDA3618CBG-19IB0 use, and what is its temperature grade?

The R1QDA3618CBG-19IB0 uses a 165-ball plastic FBGA package measuring 15 mm × 17 mm × 1.4 mm. It is rated for industrial temperature operation (−40°C to +85°C), as indicated by the "I" suffix in the part number's suffix "-19IB0". The "B0" denotes Pb-free compliance and tray packaging. This package is verified in Renesas' official ordering information and mechanical drawings.

How does the burst addressing scheme work in R1QDA3618CBG-19IB0, and what is its impact on system design?

The R1QDA3618CBG-19IB0 implements fixed four-word burst addressing: asserting /R or /W loads the SA address and automatically increments for subsequent words (A, A+1, A+2, A+3). This reduces external address bus toggling by 75%, lowering EMI and routing congestion. The burst order is fixed and non-interleaved - critical for deterministic latency in packet buffering applications. This behavior is defined in the device's bus cycle state diagram and truth tables.