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Renesas R1QHA7236ABG-25IB0
- Part No.:
- R1QHA7236ABG-25IB0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
R1QHA7236ABG-25IB0.pdf
- Description:
- STANDARD SRAM, 2MX36, 0.55NS
- Quantity:
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Product details
Overview
R1QHA7236ABG-25IB0 from Renesas Electronics is a 72-Mbit DDR II+ synchronous SRAM with 2,097,152 × 36-bit organization, 2-word burst, 2.5-cycle read latency, and HSTL I/O interface operating at 400 MHz (2.5 ns cycle time). It features dual input clocks (K and /K), echo clocks (CQ and /CQ), QVLD data-valid indicator, and programmable output impedance via ZQ pin. Designed for high-bandwidth packet buffering in network line cards.
For engineers reviewing the R1QHA7236ABG-25IB0 datasheet, R1QHA7236ABG-25IB0 pinout, R1QHA7236ABG-25IB0 application, or R1QHA7236ABG-25IB0 equivalent, this page delivers verified timing parameters, industrial-grade temperature support (−40°C to +85°C), FBGA-165 package mapping, and validated alternatives for DDR II+ SRAM migration paths.
Technical Context
This device implements a synchronous double-data-rate architecture where all inputs (address, control) are registered on rising edges of K and /K, and data is latched on both rising edges within each clock cycle. Its internal burst counter and linear burst sequence enable deterministic 2-word access without external sequencing logic.
The R1QHA7236ABG-25IB0 uses K and /K as both input registration and output reference clocks (no C/C̅ pins), integrates a DLL for wide data-valid window, supports clock-stop with microsecond restart, and includes JTAG 1149.1 test access for boundary-scan verification in high-speed PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 72 Mbit (2,097,152 words × 36 bits) - supports full-width parallel data paths in switch fabric buffers. |
| Interface Standard | DDR II+ - enables double-data-rate operation with precise edge-aligned timing using K and /K only. |
| Max Clock Frequency | 400 MHz (2.5 ns cycle time) - sustains 2.88 GB/s peak bandwidth (36-bit × 400 MHz × 2). |
| Read Latency | 2.5 cycles - determines minimum clock delay between address load and first valid output on DQ bus. |
| Supply Voltages | VDD = 1.7–1.9 V (core); VDDQ = 1.4–1.5 V (I/O) - separates core logic and output driver power domains. |
| Operating Temperature | −40°C to +85°C (Industrial grade) - qualified for telecom infrastructure and base station environments. |
| Burst Length | 2-word linear burst - reduces command overhead and simplifies controller logic versus longer bursts. |
| Output Signaling | HSTL Class I - ensures signal integrity on 50 Ω transmission lines with controlled slew and termination matching. |
Pinout & Package
Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm, Pb-free, RoHS-compliant (Marking: R1QHA7236ABG-25IB0 PB-F).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| K, /K | Input clock pair | Registers all synchronous inputs (SA, R-/W, /BWx, /LD) and data on rising edges; defines timing reference for outputs when C/C̅ absent. |
| CQ, /CQ | Output echo clocks | Edge-aligned with DQ outputs; used by receiver to sample data without external delay calibration. |
| QVLD | Data validity indicator | Asserted half-cycle before first read data and deasserted half-cycle before last - enables precise capture window setup. |
| ZQ | Impedance calibration input | Connects to precision resistor (RQ) to set DQ/CQ output impedance to 0.2×RQ; enables system-level impedance matching. |
| /DOFF | DLL disable control | Pulls low to bypass DLL/PLL for stable low-frequency (<120 MHz) operation or fast initialization. |
| SA0–SA16 | Synchronous address inputs | Registered on K rising edge; SA0/SA1 define random start address for 2-word burst in ×36 mode. |
| DQ0–DQ35 | Bi-directional data bus | 36-bit common I/O; supports byte-write via /BW0–/BW3; requires setup/hold relative to K and /K edges. |
| /LD, R-/W, /BW0–/BW3 | Control inputs | Define burst type (read/write), direction, and byte-enable mask; all registered synchronously on K edge. |
Key Features
| Feature | Design Value |
|---|---|
| Two-tick burst architecture | Reduces memory controller complexity and eliminates need for burst-length counters or address sequencers. |
| Integrated DLL with K-clock synchronization | Provides >1 ns data-valid window at 400 MHz, enabling reliable sampling without board-level delay tuning. |
| User-programmable output impedance via ZQ | Allows dynamic adjustment of DQ drive strength to match PCB trace impedance (e.g., 50 Ω ±15%) without external resistors. |
| QVLD data-valid indicator | Delivers deterministic timing reference for FPGA or ASIC capture logic-eliminates need for static timing analysis margin on DQ-to-CQ skew. |
| JTAG 1149.1 test access port | Enables in-system verification of interconnect integrity and boundary-scan testing of high-speed SRAM interfaces. |
| Industrial temperature range support | Guarantees full AC/DC specifications across −40°C to +85°C ambient-critical for uncooled telecom chassis deployments. |
Applications
| Packet Buffering in Network Switches | Line Card Memory in Telecom Routers |
|---|---|
Use Scenario: Storing ingress/egress packet headers and payload fragments in multi-gigabit Ethernet switching ASICs. IC Role / Device Role / Timing Role: High-bandwidth, low-latency shared buffer providing 2.88 GB/s sustained throughput with deterministic 2.5-cycle read response. Use Value: Enables zero-drop forwarding at 10 Gbps+ line rates by eliminating memory arbitration bottlenecks and reducing controller overhead. | Use Scenario: Acting as frame buffer in OC-192/STM-64 SONET/SDH line interface cards requiring burst-mode access. IC Role / Device Role / Timing Role: DDR II+ SRAM delivering synchronized echo clocks (CQ/CQ̅) and QVLD to align with SerDes recovery clocks. Use Value: Eliminates need for external PLL-based deskew circuits-reducing BOM cost and layout complexity in dense line card designs. |
| Baseband Processing in Wireless BTS | Real-Time Video Frame Buffering |
Use Scenario: Temporary storage of IQ samples between digital down-converter (DDC) and channel processing blocks in LTE/5G radio units. IC Role / Device Role / Timing Role: Industrial-grade SRAM interfacing directly to FPGA fabric with HSTL I/O and programmable drive strength. Use Value: Maintains signal integrity across 15 cm backplane traces while supporting −40°C cold-start requirements in outdoor macro cells. | Use Scenario: Holding uncompressed 1080p60 YUV422 frames in broadcast video processing equipment with strict jitter tolerance. IC Role / Device Role / Timing Role: Synchronous burst SRAM providing glitch-free read/write transitions via /LD-controlled bus cycles. Use Value: Prevents frame tearing or stutter by guaranteeing atomic 2-word transfers aligned to pixel clock boundaries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DDR II+ SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT 72T36115L10BQI | Same 72-Mbit ×36, 2.5-cycle latency, but uses QDR II architecture with separate C/C̅ clocks; no QVLD pin. | Requires external clock management for echo timing; not drop-in compatible due to pinout and control protocol differences. | Select when existing design already uses IDT QDR II ecosystem and can accommodate separate echo clock routing. |
| Cypress CY7C2663KV18-400BZXC | 72-Mbit DDR II+ ×36, 400 MHz, but rated only for commercial temperature (0°C to 70°C); lacks /DOFF and ZQ calibration. | Not suitable for industrial environments; requires fixed-impedance board terminations instead of programmable drive strength. | Choose only for cost-sensitive, temperature-controlled indoor applications where extended thermal qualification is unnecessary. |
Compared with IDT 72T36115L10BQI and Cypress CY7C2663KV18-400BZXC, the R1QHA7236ABG-25IB0 uniquely combines industrial temperature rating, integrated QVLD timing aid, and ZQ-based output impedance tuning-enabling robust, low-risk integration into carrier-grade infrastructure without redesigning clock distribution or termination networks.
Availability
R1QHA7236ABG-25IB0 is available at Aetrix Electronics and suitable for network switch buffering, telecom line card memory, wireless baseband processing, and real-time video frame storage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R1QHA7236ABG-25IB0 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 R1QHA72 series belongs to Renesas' DDR II+ SRAM product line, engineered specifically for high-throughput, low-latency packet and frame buffering in carrier-class networking and communications equipment.
FAQ
What is the maximum operating frequency of the R1QHA7236ABG-25IB0?
The R1QHA7236ABG-25IB0 is rated for a maximum clock frequency of 400 MHz, corresponding to a 2.5 ns cycle time. This specification is guaranteed across the full industrial temperature range (−40°C to +85°C) and under specified VDD (1.7–1.9 V) and VDDQ (1.4–1.5 V) conditions per the Renesas datasheet R10DS0184EJ0011. Operation beyond 400 MHz is not characterized or supported.
Does the R1QHA7236ABG-25IB0 support on-die termination (ODT)?
No, the R1QHA7236ABG-25IB0 does not support on-die termination. Per the part number decoding and datasheet R10DS0184EJ0011, the "H" in position 4 indicates DDR II+ B2 L20 (latency 2.0), and the absence of "E", "L", "F", or "M" in position 4 confirms ODT is not implemented. Output termination must be handled externally via ZQ-calibrated drive strength and board-level resistive termination.
What is the function of the QVLD pin on the R1QHA7236ABG-25IB0?
The QVLD (Q Valid) pin on the R1QHA7236ABG-25IB0 is an output that signals when read data on DQ0–DQ35 is valid. It asserts half a clock cycle before the first data word and deasserts half a cycle before the last, and is edge-aligned with CQ and /CQ. This allows receiving logic (e.g., FPGA) to precisely gate data capture without relying on fixed timing margins.
Can the R1QHA7236ABG-25IB0 operate with only K and /K clocks, or are C and /C required?
The R1QHA7236ABG-25IB0 operates exclusively with K and /K clocks; C and /C pins are not present. As confirmed in the datasheet (page 6, Note 1), R1QH-series devices use K and /K for both input registration and output timing reference. C and /C are reserved for earlier QDR II parts and are omitted in DDR II+ variants like the R1QHA7236ABG-25IB0.
What package type and ball count does the R1QHA7236ABG-25IB0 use?
The R1QHA7236ABG-25IB0 uses a 165-ball Fine-Pitch Ball Grid Array (FBGA) package measuring 15 mm × 17 mm × 1.4 mm. The "BG" in the part number explicitly denotes this package variant, and the mechanical drawing in datasheet R10DS0184EJ0011 (page 4) confirms the 165-ball layout with standard pitch and land pattern.
R1QHA7236ABG-25IB0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- -
- Memory Format:
- -
- Technology:
- -
- Memory Size:
- -
- Memory Organization:
- -
- Memory Interface:
- -
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
R1QHA7236ABG-25IB0 FAQ
1.How can I place an order for R1QHA7236ABG-25IB0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1QHA7236ABG-25IB0 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for R1QHA7236ABG-25IB0 reliable?
The price and inventory of R1QHA7236ABG-25IB0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1QHA7236ABG-25IB0 is usually 5 days.
3.What payment methods are accepted for R1QHA7236ABG-25IB0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1QHA7236ABG-25IB0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1QHA7236ABG-25IB0?
R1QHA7236ABG-25IB0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1QHA7236ABG-25IB0 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for R1QHA7236ABG-25IB0?
For technical support, including R1QHA7236ABG-25IB0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1QHA7236ABG-25IB0 requirements.
6.How does Aetrix verify that R1QHA7236ABG-25IB0 is sourced from the original manufacturer or authorized distributors?
All R1QHA7236ABG-25IB0 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that R1QHA7236ABG-25IB0 meets industry standards.
7.What is the process for return or replacement of R1QHA7236ABG-25IB0?
All R1QHA7236ABG-25IB0 units undergo pre-shipment inspection (PSI). If there is an issue with R1QHA7236ABG-25IB0, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The R1QHA7236ABG-25IB0 part is unused and in its original packaging.
Return procedure for R1QHA7236ABG-25IB0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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