Renesas R1QDA3618CBG-20IB0

Overview

R1QDA3618CBG-20IB0 from Renesas Electronics is a 36-Mbit QDR™ II+ SRAM with 2,097,152-word × 18-bit organization, 4-word burst, read latency of 2.0 cycles, on-die termination (ODT), and HSTL I/O interface. It operates at up to 500 MHz (2.0 ns cycle time) with 1.8 V core and 1.4–1.5 V I/O supplies, targeting high-bandwidth packet buffering in network switches and routers.

For engineers reviewing the R1QDA3618CBG-20IB0 datasheet, R1QDA3618CBG-20IB0 pinout, R1QDA3618CBG-20IB0 application, or R1QDA3618CBG-20IB0 equivalent, key selection considerations include its 165-pin FBGA (15 × 17 mm) package, synchronous dual-port architecture with independent read/write data paths, ODT support for signal integrity at 500 MHz, and industrial temperature range (−40°C to +85°C).

Technical Context

This device implements a true synchronous quad data rate interface using K and /K input clocks for address/control/data registration, and delivers output data aligned to CQ and /CQ echo clocks. Its internal burst counter and full CMOS six-transistor memory cell enable concurrent read and write transactions without bus turnaround delay.

The R1QDA3618CBG-20IB0 integrates programmable output impedance via ZQ calibration, DLL-based timing control for wide data valid windows, and JTAG 1149.1 test access. ODT is enabled and configurable (low/high range) via the ODT pin, tracking external resistor RQ to provide Thevenin-equivalent termination of 52–150 Ω on input signals.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm, 1.4 mm height, Pb-free, RoHS-compliant (marking: R1QDA3618CBG-20IB0).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed synchronous SRAM applications.

Compared with CY7C2663KV18-500BZXC and AS7C33618A-500BIN, the R1QDA3618CBG-20IB0 uniquely delivers 2.0-cycle latency, integrated ODT, and QVLD - reducing PCB complexity and enabling tighter timing closure in 500 MHz FPGA interfaces.

Availability

R1QDA3618CBG-20IB0 is available at Aetrix Electronics and suitable for network switching, telecom infrastructure, FPGA-based signal processing, and ultra-low-latency financial computing requiring stable component supply across extended production lifecycles.

Supply support for R1QDA3618CBG-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 is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and communications markets.

The R1QDA3618CBG-20IB0 belongs to Renesas' QDR™ II+ SRAM product line, engineered specifically for deterministic, high-bandwidth buffering in packet-switched networks and real-time signal processing systems.

FAQ

What is the maximum operating frequency of the R1QDA3618CBG-20IB0?

The R1QDA3618CBG-20IB0 is rated for a maximum clock frequency of 500 MHz, corresponding to a 2.0 ns minimum cycle time. This is validated under industrial temperature conditions (−40°C to +85°C) and specified with 1.8 V VDD and 1.4–1.5 V VDDQ. Operation at this speed requires proper PCB layout, controlled impedance routing, and adherence to setup/hold timing margins relative to K and /K clocks.

Does the R1QDA3618CBG-20IB0 support on-die termination (ODT)?

Yes, the R1QDA3618CBG-20IB0 includes on-die termination (ODT) on its address, control, and data input pins. ODT impedance is selectable between low-range (52–105 Ω) and high-range (105–150 Ω) via the ODT pin, and tracks the value of the external ZQ resistor. This eliminates the need for external termination resistors and improves signal integrity at 500 MHz.

What is the purpose of the QVLD pin on the R1QDA3618CBG-20IB0?

The QVLD (Q Valid) pin on the R1QDA3618CBG-20IB0 provides an edge-aligned indicator of valid read data output timing. It asserts half a clock cycle before the first data word and deasserts half a cycle after the last, synchronously with CQ and /CQ. This allows receiving logic (e.g., FPGA) to precisely gate data capture without relying solely on clock-to-data skew margins.

How is burst addressing handled in the R1QDA3618CBG-20IB0?

The R1QDA3618CBG-20IB0 implements fixed 4-word burst addressing internally. When /R or /W is asserted, the 19-bit SA[0:18] bus latches the base address; the internal counter then automatically increments for the next three words (A, A+1, A+2, A+3). No external address sequencing is required, reducing controller complexity and bus bandwidth usage by 75% compared to discrete addressing.

What package type and dimensions does the R1QDA3618CBG-20IB0 use?

The R1QDA3618CBG-20IB0 uses a 165-ball Fine-Pitch Ball Grid Array (FBGA) package measuring 15 mm × 17 mm × 1.4 mm. It is Pb-free and RoHS-compliant, with marking "R1QDA3618CBG-20IB0" on the top surface. The ball pitch is 0.8 mm, and the package supports standard reflow soldering profiles for lead-free assembly.