Renesas R1QDA7236ABB-19IB0

Overview

R1QDA7236ABB-19IB0 from Renesas Electronics is a 72-Mbit (2,097,152 × 36-bit) QDR™ II+ synchronous SRAM with 2.5-cycle read latency, on-die termination (ODT), HSTL I/O, and 165-pin FBGA (13 × 15 mm) packaging. It operates at 533 MHz (1.875 ns cycle time), supports concurrent read/write via separate data ports, and targets high-bandwidth packet buffering in network switches and routers.

For engineers reviewing the R1QDA7236ABB-19IB0 datasheet, R1QDA7236ABB-19IB0 pinout, R1QDA7236ABB-19IB0 application, or R1QDA7236ABB-19IB0 equivalent, key selection criteria include burst-of-4 timing alignment, ODT impedance control via ZQ pin, QVLD-valid-data indication, K//K clock-synchronized register latching, and industrial temperature range (−40°C to +85°C) operation.

Technical Context

This device implements a true quad data rate architecture with independent read and write data paths, enabling full 100% bus utilization during simultaneous transactions. Its internal burst counter and synchronous address registry are clocked exclusively on the rising edges of K and /K, eliminating need for external phase alignment.

The R1QDA7236ABB-19IB0 integrates a DLL/PLL for output timing stabilization, supports programmable output impedance via ZQ resistor termination, and uses QVLD edge-aligned with CQ//CQ to signal valid output data windows-critical for reliable capture in 533 MHz systems without external strobes.

Key Specifications

Pinout & Package

Package: 165-ball plastic FBGA (13 mm × 15 mm, 0.8 mm pitch, 1.4 mm height), RoHS-compliant Pb-free tray packaging.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2663KV18-533BZC and AS7C361024A-533BIN, the R1QDA7236ABB-19IB0 provides integrated ODT and guaranteed industrial temperature operation without requiring layout changes for termination or thermal derating - reducing BOM count and validation scope in new designs.

Availability

R1QDA7236ABB-19IB0 is available at Aetrix Electronics and suitable for network packet buffering, high-speed test instrumentation, telecom baseband processing, and defense radar signal buffering requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for R1QDA7236ABB-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 management, and high-performance memory solutions for industrial, automotive, and communications markets.

The R1QDA72 series belongs to Renesas' QDR™ II+ SRAM product line, engineered specifically for deterministic, low-latency, high-throughput buffering in packet-switched infrastructure where concurrent read/write bandwidth and precise timing predictability are critical.

FAQ

What is the maximum operating frequency and corresponding cycle time for the R1QDA7236ABB-19IB0?

The R1QDA7236ABB-19IB0 is rated for a maximum operating 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 VDD = 1.8 V ± 0.1 V and VDDQ = 1.5 V ± 0.1 V. The device maintains timing compliance across its full voltage and temperature range without derating.

Does the R1QDA7236ABB-19IB0 support on-die termination (ODT), and how is it configured?

Yes, the R1QDA7236ABB-19IB0 supports on-die termination (ODT) as indicated by the "D" in its part number prefix. ODT is controlled via the ODT pin and calibrated using the ZQ pin connected to a precision 250 Ω resistor to ground. When ODT = low, low-range mode (52–105 Ω) is selected; when high, high-range mode (105–150 Ω) applies. Floating defaults to high-range mode.

How does the QVLD signal function in the R1QDA7236ABB-19IB0, and why is it important?

The QVLD signal in the R1QDA7236ABB-19IB0 is an output-valid indicator edge-aligned with CQ and /CQ. It asserts half a cycle before the first read data word and deasserts half a cycle before the last, defining the exact window of valid output data. This eliminates timing uncertainty in high-speed receivers and removes the need for complex delay-locked loops or manual deskew calibration in FPGA-based systems interfacing with the R1QDA7236ABB-19IB0.

What is the burst length and organization of the R1QDA7236ABB-19IB0, and how does it affect address handling?

The R1QDA7236ABB-19IB0 implements a fixed burst-of-4 architecture with a 2,097,152-word × 36-bit organization. Internally, the 20-bit SA[0–19] address bus is extended by two LSBs to generate four consecutive addresses (A, A+1, A+2, A+3) per /R or /W command. This reduces external address bus toggling frequency by 75%, easing timing closure on high-speed control interfaces while maintaining full 72-Mbit capacity.

Is the R1QDA7236ABB-19IB0 compatible with JTAG boundary-scan testing, and what pins are involved?

Yes, the R1QDA7236ABB-19IB0 fully complies with IEEE 1149.1 (JTAG) boundary-scan standards. It uses dedicated TDI, TDO, TCK, and TMS pins located on the FBGA package (pins R14, R12, R15, and R16 respectively). These operate at 1.8 V I/O levels and support full chain visibility and interconnect testing - essential for validating high-density, high-speed PCB assemblies containing the R1QDA7236ABB-19IB0.