Renesas R1QDA3636CBB-19IB0

Overview

R1QDA3636CBB-19IB0 from Renesas Electronics is a 36-Mbit QDR™ II+ SRAM with 1,048,576-word × 36-bit organization, 2.5-cycle read latency, on-die termination (ODT), and HSTL I/O. It operates at up to 533 MHz (1.875 ns cycle time), uses 1.8 V core (VDD) and 1.4–1.6 V I/O (VDDQ) supplies, and is packaged in a 165-pin FBGA (13 × 15 × 1.4 mm). It serves high-bandwidth packet buffering in network switches and routers.

For engineers reviewing the R1QDA3636CBB-19IB0 datasheet, R1QDA3636CBB-19IB0 pinout, R1QDA3636CBB-19IB0 application, or R1QDA3636CBB-19IB0 equivalent, key selection criteria include burst-of-4 DDR timing, K//K synchronous clocking, ODT impedance control via ZQ, QVLD data-valid signaling, and compatibility with 533 MHz system clocks in telecom infrastructure designs.

Technical Context

This device implements a true quad-data-rate architecture: separate read/write ports enable concurrent transactions, while dual-edge clocking on K and /K registers inputs and outputs across four consecutive data beats per burst. Its DLL/PLL circuitry ensures tight output data valid window alignment with CQ//CQ echo clocks, supporting deterministic timing at 533 MHz.

The R1QDA3636CBB-19IB0 integrates on-die termination controlled by the ODT pin and calibrated against an external ZQ resistor, enabling dynamic impedance matching for signal integrity on high-speed buses. Its QVLD output provides half-cycle-advanced indication of valid read data, simplifying capture in FPGA- or ASIC-based memory controllers.

Key Specifications

Pinout & Package

Package: 165-pin Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm footprint, 0.8 mm ball pitch, 1.4 mm height, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2663KV18-553BAXI and AS7C33636B-553BIN, the R1QDA3636CBB-19IB0 delivers superior signal integrity via calibrated ODT and deterministic data capture via QVLD-critical for 533 MHz operation in telecom and networking systems where timing margin is constrained.

Availability

R1QDA3636CBB-19IB0 is available at Aetrix Electronics and suitable for network switch buffering, telecom line card memory, and wireless baseband processing requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for R1QDA3636CBB-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and communications markets.

The R1QDA36xx series belongs to Renesas' QDR™ II+ SRAM product line, engineered specifically for high-speed, low-latency packet buffering and descriptor storage in networking and telecom infrastructure where deterministic burst access and signal integrity at >500 MHz are mandatory.

FAQ

What is the maximum operating frequency of the R1QDA3636CBB-19IB0?

The R1QDA3636CBB-19IB0 supports a maximum clock frequency of 533 MHz, corresponding to a 1.875 ns minimum cycle time. This rating is validated under specified DC operating conditions (VDD = 1.8 V ±0.1 V, VDDQ = 1.4–1.6 V) and industrial temperature range (–40°C to +85°C). Operation above this frequency violates AC timing specifications and may cause data corruption.

Does the R1QDA3636CBB-19IB0 support on-die termination (ODT)?

Yes, the R1QDA3636CBB-19IB0 supports ODT via the dedicated ODT pin and ZQ calibration resistor. When enabled, it provides programmable Thevenin termination (52–150 Ω range) on address and control inputs. ODT is configurable as low-range (0.3 × RQ), high-range (0.6 × RQ), or disabled-enabling impedance matching without external resistors.

What is the function of the QVLD pin on the R1QDA3636CBB-19IB0?

The QVLD pin on the R1QDA3636CBB-19IB0 is a synchronous data-valid indicator that asserts half a clock cycle before the first valid read data (Q0–Q35) and deasserts half a cycle before the last. It is edge-aligned with CQ//CQ echo clocks, allowing external logic to precisely gate data capture-eliminating timing uncertainty in high-speed FPGA or ASIC interfaces.

How is burst addressing implemented in the R1QDA3636CBB-19IB0?

The R1QDA3636CBB-19IB0 implements fixed burst-of-4 addressing: upon assertion of /R or /W, the internal address counter automatically increments by two per K clock cycle, generating four sequential addresses (A, A+1, A+2, A+3) over two clock periods. This reduces address bus toggling frequency by 4× and simplifies controller design versus discrete address generation.

What power supply requirements must be met for reliable operation of the R1QDA3636CBB-19IB0?

The R1QDA3636CBB-19IB0 requires three independent supplies: VDD = 1.8 V ±0.1 V (core), VDDQ = 1.4–1.6 V (I/O), and VREF = VDDQ/2 ±1% (input reference). VDD must stabilize before applying K//K clocks; VDDQ and VREF should follow within 200 ms. All 24 VSS balls must be solidly connected to ground plane for noise suppression and thermal dissipation.