Renesas R1Q2A7236ABG-40IA1

Overview

R1Q2A7236ABG-40IA1 from Renesas Electronics is a 72-Mbit synchronous Quad Data Rate II (QDR-II) SRAM with 2,097,152-word × 36-bit organization, 1.8 V core supply (VDD), 1.4–1.5 V I/O supply (VDDQ), and 250 MHz maximum operating frequency. It features dual-clock DDR timing (K/̅K for inputs, C/̅C for outputs), burst-of-two read/write operation, and HSTL-compatible I/O for high-speed networking and packet buffering applications.

For engineers reviewing the R1Q2A7236ABG-40IA1 datasheet, R1Q2A7236ABG-40IA1 pinout, R1Q2A7236ABG-40IA1 application, or R1Q2A7236ABG-40IA1 equivalent, this device delivers deterministic low-latency memory access in FPGA-attached cache, telecom line card buffers, and high-throughput switching fabric designs where concurrent read/write ports and precise echo clock synchronization are required.

Technical Context

The R1Q2A7236ABG-40IA1 implements a full CMOS six-transistor memory cell architecture with integrated synchronous peripheral circuitry, including a burst counter and input register latching on the rising edges of K and /K. Its dual-clock interface separates address/control registration (K/̅K) from output data timing (C/̅C), minimizing skew between data and echo clocks (CQ/̅CQ).

It supports clock-stop mode with microsecond restart, DLL/PLL-based output timing control for wide data valid windows, and JTAG 1149.1 test access. The device operates at industrial temperature (−40°C to +85°C) and uses 165-pin FBGA (13 mm × 15 mm) packaging with HSTL I/O and programmable output impedance via ZQ calibration.

Key Specifications

Pinout & Package

Package: 165-pin Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm body, 0.8 mm ball pitch, BB marking (Pb-free, tray). Compliant with JEDEC MO-270AB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2663KV18-400BZXC and AS7C3256A-15JCIN, the R1Q2A7236ABG-40IA1 uniquely balances 250 MHz QDR-II performance with C/̅C timing control and industrial temperature support-making it optimal for new designs targeting robust, medium-bandwidth packet buffering without QDR-II+ ecosystem lock-in.

Availability

R1Q2A7236ABG-40IA1 is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, FPGA-accelerated compute cache, and telecom baseband processing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R1Q2A7236ABG-40IA1 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, and memory solutions for automotive, industrial, and infrastructure markets.

The R1Q2A7236ABG-40IA1 belongs to Renesas' QDR-II SRAM product line, engineered specifically for high-throughput, low-latency data buffering in networking and communications equipment where deterministic timing and industrial reliability are mandatory.

FAQ

What is the maximum operating frequency of the R1Q2A7236ABG-40IA1?

The R1Q2A7236ABG-40IA1 is rated for a maximum operating frequency of 250 MHz, corresponding to a minimum cycle time of 4.0 ns. This enables 500 MT/s effective data transfer rates on both read and write ports using double-data-rate operation. The device meets this specification under industrial temperature conditions (−40°C to +85°C) with VDD = 1.8 V ±0.1 V and VDDQ = 1.5 V.

Does the R1Q2A7236ABG-40IA1 support independent read and write operations?

Yes, the R1Q2A7236ABG-40IA1 supports fully concurrent read and write operations through physically separate data ports (D0–D35 for input, Q0–Q35 for output) and independent control (/R and /W). This allows simultaneous access without arbitration delay-critical for real-time packet buffering and switch fabric applications where back-to-back read/write transactions occur continuously.

How does the ZQ pin function on the R1Q2A7236ABG-40IA1?

The ZQ pin on the R1Q2A7236ABG-40IA1 serves as the output impedance calibration input. When connected to a precision resistor (RQ) to ground, it programs the Q and CQ output driver impedance to 0.2 × RQ. For example, a 250 Ω resistor yields ~50 Ω output impedance. This eliminates need for external series termination and improves signal integrity on high-speed traces without requiring layout changes.

What is the read latency of the R1Q2A7236ABG-40IA1 and how is it implemented?

The R1Q2A7236ABG-40IA1 has a fixed read latency of 1.5 clock cycles (L15), meaning the first valid output word appears 1.5 K-clock periods after the /R signal is asserted. This latency is implemented via internal pipelining synchronized to the K/̅K clock pair and is guaranteed across voltage, temperature, and process corners-enabling accurate timing budgeting in synchronous systems.

Can the R1Q2A7236ABG-40IA1 operate without the DLL/PLL enabled?

Yes, the R1Q2A7236ABG-40IA1 can operate with DLL/PLL disabled by holding /DOFF low. In this mode, the device functions reliably down to DC, bypassing the DLL/PLL for stable low-frequency operation (<120 MHz). However, echo clock (CQ/̅CQ) alignment degrades, and the data valid window narrows-so DLL/PLL should remain enabled for 250 MHz operation to maintain timing margins.