Renesas R1Q2A7236ABG-50IA1

Overview

R1Q2A7236ABG-50IA1 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), 2-word burst, 1.5-cycle read latency, and HSTL-compatible interfaces. It operates at up to 200 MHz (5 ns cycle time) and is used in high-bandwidth packet buffering for network switches and routers.

For engineers reviewing the R1Q2A7236ABG-50IA1 datasheet, R1Q2A7236ABG-50IA1 pinout, R1Q2A7236ABG-50IA1 application, or R1Q2A7236ABG-50IA1 equivalent, this page delivers verified timing parameters, FBGA-165 pin mapping, industrial temperature support (−40°C to +85°C), burst control logic, and QDR-II-specific clocking architecture - all critical for DDR-aligned memory subsystem design and signal integrity validation.

Technical Context

This device implements true dual-port QDR-II architecture with independent read and write data paths, enabling concurrent transactions without bus contention. Its synchronous interface uses K and /K input clocks for address/control registration and data latching on both rising edges, while CQ and /CQ echo clocks provide precise data-valid timing alignment.

The internal burst counter and self-timed write control eliminate external sequencing logic. JTAG 1149.1 test access and programmable output impedance via ZQ resistor tuning support production testability and system-level impedance matching across high-speed PCB traces.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm body, 0.8 mm ball pitch, Pb-free (RoHS-compliant), industrial temperature grade.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2663KV18-500BZXC, R1Q2A7236ABG-50IA1 trades peak speed for industrial reliability and DLL flexibility; compared with AS7C36256P-50JCIN, it delivers 2× effective bandwidth and eliminates timing-critical control logic in high-throughput systems.

Availability

R1Q2A7236ABG-50IA1 is available at Aetrix Electronics and suitable for network packet buffering, high-speed switch fabric memory, and telecom line card buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R1Q2A7236ABG-50IA1 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 R1Q2A series belongs to Renesas' QDR-II SRAM product line, designed specifically for high-bandwidth, low-latency buffering in networking and communications equipment where deterministic timing and concurrent access are mandatory.

FAQ

What is the maximum operating frequency of the R1Q2A7236ABG-50IA1?

The R1Q2A7236ABG-50IA1 is rated for a maximum clock frequency of 200 MHz, corresponding to a 5 ns minimum cycle time. This allows 400 million transfers per second (MT/s) on each of its 36 data lines. The device achieves this performance using K and /K input clocks and CQ and /CQ echo clocks, with timing validated across the full industrial temperature range (−40°C to +85°C). Operation beyond 200 MHz is not guaranteed and violates the AC specifications defined in the official Renesas datasheet R10DS0164EJ0011.

Does the R1Q2A7236ABG-50IA1 support industrial temperature operation?

Yes, the R1Q2A7236ABG-50IA1 is explicitly qualified for industrial temperature operation from −40°C to +85°C, as indicated by the "I" suffix in the part number and confirmed in the Renesas datasheet R10DS0164EJ0011. This qualification covers all DC and AC electrical characteristics, including read/write timing, supply current, and output drive strength. The device uses 1.8 V core and 1.5 V I/O supplies optimized for stability across this range, and includes features like /DOFF DLL-bypass to maintain functionality during cold-start or low-frequency operation.

How does the R1Q2A7236ABG-50IA1 handle read and write operations concurrently?

The R1Q2A7236ABG-50IA1 implements true dual-port QDR-II architecture with physically separate read and write data paths. A read command (/R low) and write command (/W low) can be issued in the same clock cycle without conflict, because address and control signals are registered on the rising edge of K, and data flows independently on D0–D35 (input) and Q0–Q35 (output). This eliminates turnaround cycles and enables 100% bus utilization - delivering sustained 400 MT/s bidirectional throughput. The internal state machine ensures atomicity and avoids bus contention, as verified in the bus cycle state diagram on page 13 of the datasheet.

What is the purpose of the ZQ pin on the R1Q2A7236ABG-50IA1?

The ZQ pin on the R1Q2A7236ABG-50IA1 serves as the reference input for programmable output impedance calibration. When connected to ground through a precision resistor (RQ), the device tunes its Q and CQ output drivers to match the system's data bus impedance - typically targeting 50 Ω single-ended (0.2 × RQ). The recommended RQ value is 250 Ω ±1%, yielding ~50 Ω output impedance with ≤15% tolerance. This feature reduces signal reflections and improves timing margins in high-speed layouts. Leaving ZQ unconnected or tying it to VSS disables calibration and forces minimum impedance mode.

Can the R1Q2A7236ABG-50IA1 operate without using the DLL/PLL?

Yes, the R1Q2A7236ABG-50IA1 can operate with the DLL/PLL disabled by holding the /DOFF pin low. In this mode, the device bypasses the delay-locked loop and uses raw K and /K edges for output timing, enabling stable operation down to DC and simplifying power-up sequencing. This is particularly useful for systems requiring sub-120 MHz operation or fast restart after clock stop. The /DOFF pin must be driven actively low - floating or high enables DLL operation. All timing parameters remain valid in DLL-bypass mode, as specified in the "DLL/PLL Off Mode" section of the datasheet (page 9).