Renesas R1QHA7236ABG-25IA0

Overview

R1QHA7236ABG-25IA0 from Renesas Electronics is a 72-Mbit DDR II+ synchronous SRAM with 2M × 36-bit organization, 2.0-cycle read latency, 400 MHz max clock frequency, HSTL I/O interface, and 165-pin FBGA (15 × 17 mm) package. It serves as a high-bandwidth, low-voltage data buffer in network packet processors and telecom line cards requiring precise DDR timing and echo-clock–assisted data capture.

For engineers reviewing the R1QHA7236ABG-25IA0 datasheet, R1QHA7236ABG-25IA0 pinout, R1QHA7236ABG-25IA0 application, or R1QHA7236ABG-25IA0 equivalent, key selection considerations include its DDR II+ burst-2 operation, K//K-only clocking (no C//C pins), QVLD-valid-data indicator, ODT-disabled configuration, and industrial temperature range (−40°C to +85°C).

Technical Context

This device implements a synchronous double-data-rate architecture where all inputs-including address (SA), control (/LD, R-/W, /BW0–/BW3), and clocks (K, /K)-are registered on rising edges of K and /K. Data I/O occurs on both rising edges of the same clock pair, eliminating need for separate C//C outputs.

The internal DLL/PLL enables wide output data valid window and supports future frequency scaling up to 400 MHz; /DOFF pin allows DLL/PLL bypass for stable low-frequency operation. QVLD output is edge-aligned with CQ//CQ and asserts half-cycle before first read data to simplify high-speed receiver timing alignment.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, Pb-free, RoHS-compliant (marking suffix "BG" per datasheet).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT 72T3650L10PFI and Cypress CY7C2665KV18-400BZI, the R1QHA7236ABG-25IA0 uniquely combines industrial temperature qualification, integrated QVLD signaling, and K//K-only clock simplicity - reducing PCB routing complexity and improving timing margin in thermally demanding applications.

Availability

R1QHA7236ABG-25IA0 is available at Aetrix Electronics and suitable for packet buffering, telecom line card aggregation, baseband processing, and industrial motion control applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade performance.

Supply support for R1QHA7236ABG-25IA0 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 automotive, industrial, and infrastructure markets.

The R1QHA72 series belongs to Renesas' DDR II+ SRAM product line, designed specifically for high-speed networking and telecom equipment requiring deterministic latency, echo-clock synchronization, and industrial reliability.

FAQ

What is the maximum operating frequency and corresponding cycle time for R1QHA7236ABG-25IA0?

The R1QHA7236ABG-25IA0 supports a maximum clock frequency of 400 MHz, corresponding to a minimum cycle time of 2.5 ns. This specification is validated under industrial temperature conditions (−40°C to +85°C) with VDD = 1.8 V and VDDQ = 1.5 V, and assumes proper signal integrity, termination, and power delivery per the datasheet's AC timing requirements.

Does R1QHA7236ABG-25IA0 support on-die termination (ODT)?

No, R1QHA7236ABG-25IA0 does not support on-die termination. The part number suffix "H" indicates DDR II+ B2 L20 w/o ODT, and the datasheet confirms ODT functionality is absent in R1QH-series devices. External termination must be implemented on the PCB using series or parallel resistors matched to the transmission line impedance.

What is the function of the QVLD pin on R1QHA7236ABG-25IA0?

The QVLD pin on R1QHA7236ABG-25IA0 is an output valid indicator that signals when read data on DQ[0:35] is stable and ready for sampling. It asserts half a clock cycle before the first valid data edge and deasserts half a cycle before the last, and is edge-aligned with CQ//CQ - enabling precise setup/hold margin definition in high-speed receivers without manual strobe tuning.

Can R1QHA7236ABG-25IA0 operate with only K and /K clocks, or are C and /C required?

R1QHA7236ABG-25IA0 operates exclusively with K and /K clocks; C and /C pins are not present in DDR II+ series devices like this one. The datasheet explicitly states that R1QH-series parts use K//K as both input registration and output timing reference - eliminating the need for separate C//C clock routing and simplifying board layout.

What is the recommended power-up sequence for R1QHA7236ABG-25IA0?

The recommended power-up sequence for R1QHA7236ABG-25IA0 is: apply VSS first, then VDD (1.8 V), followed by VDDQ and VREF simultaneously (1.4–1.5 V and ~0.75 V), and finally apply stable K//K clocks after VDDQ/VREF stabilization. This sequence prevents latch-up and ensures proper initialization of internal registers and DLL/PLL circuitry per Renesas' R10DS0184EJ0011 specification.