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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas UPD46185182BF1-E33-EQ1-A

Name: UPD46185182BF1-E33-EQ1-A
Brand: Renesas
SKU: UPD46185182BF1-E33-EQ1-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UPD46185182BF1-E33-EQ1-A

Manufacturer:: Renesas

Category:: Memory

Package:: -

Datasheet:: UPD46185182BF1-E33-EQ1-A.pdf

Description:: QDR SRAM, 1MX18, 0.45NS

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Product details

Overview

UPD46185182BF1-E33-EQ1-A from Renesas Electronics is a 1,048,576-word × 18-bit synchronous quad data rate (QDR II) SRAM with 3.3 ns clock cycle time (300 MHz), 1.8 V core supply, HSTL interface, and 165-pin plastic BGA (13 × 15) packaging. It supports concurrent read/write operations, burst-2 DDR transactions, and is used in high-speed networking buffers and FPGA co-processor memory subsystems.

For engineers reviewing the UPD46185182BF1-E33-EQ1-A datasheet, UPD46185182BF1-E33-EQ1-A pinout, UPD46185182BF1-E33-EQ1-A application, or UPD46185182BF1-E33-EQ1-A equivalent, key selection considerations include its dual-clock timing architecture (K/K# for input, C/C# for output), user-programmable output impedance (35–70 Ω), PLL-enabled wide data valid window, and JTAG 1149.1 test port support.

Technical Context

This QDR II SRAM implements separate read and write data ports with independent address latching on K (read) and K# (write) rising edges. Its internal PLL generates tightly matched C/C# output clocks and echo clocks (CQ/CQ#) to enable precise flight-time compensation and skew-matched data delivery.

The device uses full-CMOS six-transistor memory cells and integrates burst counters, HSTL I/O buffers referenced to VREF (VDDQ/2), and byte-write control via BW0#/BW1#. Clock-stop mode restores operation within 20 μs, and DLL# allows PLL bypass for low-frequency debug.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory organization	1,048,576 words × 18 bits (18 Mbit total)
Clock frequency	300 MHz - enables 600 MT/s effective data rate per port
Core supply voltage	1.8 ± 0.1 V - requires tight regulation; VDDQ must not exceed VDD
Interface standard	HSTL Class I - compatible with JEDEC-compliant 1.5 V or 1.8 V VDDQ supplies
Package	165-pin plastic BGA (13 × 15 mm) - lead-free, thermal resistance θ_ja = 16.5 °C/W (4-layer board, still air)
Burst operation	2-word burst - delivers two consecutive data words per clock cycle with no turnaround penalty
Output impedance	User-programmable 35–70 Ω via ZQ pin - matches system bus impedance using external resistor to ground

Pinout & Package

165-pin plastic BGA (13 × 15 mm), top view, RoHS-compliant, lead-free finish. Pin mapping validated per Renesas datasheet R10DS0112EJ0200 Rev.2.00 Pages 4 and 6.

Pin/Terminal	Circuit Role	Design Meaning
A[0:18]	Synchronous address inputs	Latched on K rising edge (READ) or K# rising edge (WRITE); 19-bit address space for 1M-word depth
D0–D17	Synchronous data inputs	18-bit parallel write data; meet setup/hold relative to K and K# rising edges
Q0–Q17	Synchronous data outputs	18-bit parallel read data; synchronized to C/C# rising edges (or K/K# if C/C# tied HIGH)
R#, W#	Read/write command inputs	Active-low; initiate burst-2 READ or WRITE on next K rising edge; both high = NOP
BW0#, BW1#	Byte write select inputs	Enable writing of D0–D8 (BW0# low) or D9–D17 (BW1# low); both high = no write
K, K#	Input clocks	Differential pair; K rising edge latches READ address/control; K# rising edge latches WRITE address/data
C, C#	Output clocks	Differential pair; C# rising edge times first output word, C rising edge times second; must be fixed HIGH if unused
CQ, CQ#	Echo clock outputs	Tightly matched to Q outputs; provide data-valid indication; continue running even when Q tristates
ZQ	Output impedance calibration	Connect external resistor to ground to set Q/CQ/CQ# output impedance to 0.2 × RQ; cannot float or tie to GND
VREF	HSTL input reference	Nominally VDDQ/2; supplies reference for all HSTL input buffers (A, R#, W#, BWx#, K/K#, C/C#)
VDD, VDDQ	Power supplies	VDD = 1.8 V core; VDDQ = 1.4–1.8 V I/O supply; VDDQ ≤ VDD required during operation
TDI, TDO, TCK, TMS	JTAG 1149.1 interface	1.8 V I/O level; TCK must tie to VSS if JTAG unused; TDI/TMS may float if unused

Key Features

Feature	Design Value
Concurrent read/write ports	Enables full-duplex memory access without arbitration delay-critical for packet buffering in switch ASICs
PLL-based output timing	Generates C/C# and CQ/CQ# with <±0.1 ns data-to-clock skew-eliminates need for board-level trace length matching
Programmable output impedance	35–70 Ω tuning via ZQ pin and external resistor-reduces signal integrity issues across varied PCB stackups
Two-tick burst operation	Delivers two data words per clock cycle with zero turnaround time-maximizes DDR bus utilization to 100%
Clock-stop capability	Enters low-power state with clocks halted; resumes normal operation within 20 μs-supports dynamic power gating
JTAG 1149.1 test port	Enables boundary-scan testing and in-system debugging without additional probe points-reduces test cost and complexity

Applications

High-Speed Network Switch Buffer	FPGA-Based Protocol Accelerator
Use Scenario: Line-rate packet buffering in 10G/25G Ethernet switches where ingress/egress queues require simultaneous read and write at >500 MT/s. IC Role / Device Role / Timing Role: Dual-port QDR II SRAM serving as shared buffer between MAC and switching fabric; K/K# and C/C# clocks decouple input/output timing domains. Use Value: Concurrent read/write eliminates arbitration stalls; 300 MHz clock + burst-2 yields 1.2 GB/s aggregate bandwidth-meets line-rate requirements without interleaving.	Use Scenario: Offloading TCP/IP or encryption processing from host CPU using FPGA with embedded soft-core processor and hardware accelerators. IC Role / Device Role / Timing Role: High-bandwidth scratchpad memory for FPGA logic; provides low-latency, deterministic access to packet headers and crypto keys. Use Value: HSTL interface ensures clean signal integrity at 300 MHz; programmable ZQ impedance adapts to FPGA I/O drive strength-reducing timing closure effort.
Baseband Digital Signal Processor Memory	Real-Time Video Frame Buffer
Use Scenario: Storing intermediate FFT and channel estimation results in LTE/5G baseband processing units operating under strict latency budgets. IC Role / Device Role / Timing Role: Low-latency, high-throughput memory for DSP co-processors; operates with K/K# synchronized to baseband clock domain. Use Value: PLL-generated CQ/CQ# echo clocks provide precise data-valid timing-enabling reliable capture by downstream logic without added setup/hold margin.	Use Scenario: Storing uncompressed 4K video frames (3840×2160×24bpp) for real-time color correction and compositing in broadcast equipment. IC Role / Device Role / Timing Role: Frame buffer memory interfaced to video processing ASIC; uses burst-2 reads/writes to match pixel clock timing. Use Value: 18-bit bus width supports RGB444 or YUV422 packing; 1.8 V supply reduces power vs. older 3.3 V QDR-critical for fanless enclosures.

High-Speed Network Switch Buffer

FPGA-Based Protocol Accelerator

Use Scenario: Line-rate packet buffering in 10G/25G Ethernet switches where ingress/egress queues require simultaneous read and write at >500 MT/s.

IC Role / Device Role / Timing Role: Dual-port QDR II SRAM serving as shared buffer between MAC and switching fabric; K/K# and C/C# clocks decouple input/output timing domains.

Use Value: Concurrent read/write eliminates arbitration stalls; 300 MHz clock + burst-2 yields 1.2 GB/s aggregate bandwidth-meets line-rate requirements without interleaving.

Use Scenario: Offloading TCP/IP or encryption processing from host CPU using FPGA with embedded soft-core processor and hardware accelerators.

IC Role / Device Role / Timing Role: High-bandwidth scratchpad memory for FPGA logic; provides low-latency, deterministic access to packet headers and crypto keys.

Use Value: HSTL interface ensures clean signal integrity at 300 MHz; programmable ZQ impedance adapts to FPGA I/O drive strength-reducing timing closure effort.

Baseband Digital Signal Processor Memory

Real-Time Video Frame Buffer

Use Scenario: Storing intermediate FFT and channel estimation results in LTE/5G baseband processing units operating under strict latency budgets.

IC Role / Device Role / Timing Role: Low-latency, high-throughput memory for DSP co-processors; operates with K/K# synchronized to baseband clock domain.

Use Value: PLL-generated CQ/CQ# echo clocks provide precise data-valid timing-enabling reliable capture by downstream logic without added setup/hold margin.

Use Scenario: Storing uncompressed 4K video frames (3840×2160×24bpp) for real-time color correction and compositing in broadcast equipment.

IC Role / Device Role / Timing Role: Frame buffer memory interfaced to video processing ASIC; uses burst-2 reads/writes to match pixel clock timing.

Use Value: 18-bit bus width supports RGB444 or YUV422 packing; 1.8 V supply reduces power vs. older 3.3 V QDR-critical for fanless enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C2663KV18	1M × 18, 300 MHz, 1.8 V, 165-pin BGA; identical organization and timing but Cypress-specific JTAG implementation and different ZQ calibration behavior	Same use cases; requires validation of JTAG chain compatibility and ZQ resistor value (120 Ω vs. Renesas 150 Ω typical)	Select when existing design uses Cypress toolchain or requires second-source qualification with identical AC specs
AS7C33256P	1M × 18, 250 MHz, 3.3 V, 119-pin TSOP-II; lower speed, higher voltage, different package and interface (SSTL vs. HSTL)	Not suitable for 300 MHz systems or 1.8 V designs; usable only in legacy 3.3 V backplanes with relaxed timing margins	Consider only for cost-sensitive, non-performance-critical upgrades where voltage and footprint changes are acceptable

Compared with CY7C2663KV18 and AS7C33256P, UPD46185182BF1-E33-EQ1-A delivers higher bandwidth (600 vs. 500 MT/s), lower power (1.8 V core), and tighter output skew control via integrated PLL-making it optimal for new high-speed infrastructure designs requiring deterministic timing.

Availability

UPD46185182BF1-E33-EQ1-A is available at Aetrix Electronics and suitable for high-speed networking equipment, FPGA-based accelerators, baseband signal processors, and broadcast video systems requiring stable component supply and long-term industrial temperature support (0 to 70°C).

Supply support for UPD46185182BF1-E33-EQ1-A 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The UPD46185182BF1-E33-EQ1-A belongs to Renesas' QDR II SRAM product line, engineered specifically for high-bandwidth, low-latency memory subsystems in networking, telecom, and high-performance computing where concurrent access and precise timing control are critical.

FAQ

What is the maximum guaranteed clock frequency for UPD46185182BF1-E33-EQ1-A?

The UPD46185182BF1-E33-EQ1-A is rated for 300 MHz operation with a 3.3 ns clock cycle time, as specified in the ordering information table on page 2 of the datasheet. This applies to both K/K# input clocks and C/C# output clocks under TA = 0 to 70°C and VDD = 1.8 ± 0.1 V conditions. Operation above this frequency is not guaranteed and violates AC timing specifications.

Does UPD46185182BF1-E33-EQ1-A support true dual-port operation with independent read and write addresses?

No. The UPD46185182BF1-E33-EQ1-A supports concurrent read and write operations but uses a single address bus. Read and write addresses are latched on different clock edges (K for read, K# for write), enabling overlapped access-but both ports share the same A[0:18] pins. True independent dual-port functionality with separate address buses is not implemented.

How is output impedance calibrated on UPD46185182BF1-E33-EQ1-A?

Output impedance on UPD46185182BF1-E33-EQ1-A is calibrated via the ZQ pin: an external resistor (RQ) is connected from ZQ to ground, and the device sets Q, CQ, and CQ# output impedance to 0.2 × RQ. Typical RQ values range from 150 Ω to 350 Ω, yielding 30–70 Ω output drive. ZQ must never be left floating or tied to VSS.

Can UPD46185182BF1-E33-EQ1-A operate without the PLL enabled?

Yes. Pulling DLL# low disables the PLL, allowing operation at frequencies below TKHKH (MAX.)-but AC/DC characteristics are not guaranteed, read latency changes to 1.0 clock cycle, and timing margins shrink significantly. For production use, DLL# must be tied HIGH (e.g., to VDDQ via ≤10 kΩ resistor) to ensure full specification compliance.

What is the purpose of the CQ and CQ# pins on UPD46185182BF1-E33-EQ1-A?

The CQ and CQ# pins on UPD46185182BF1-E33-EQ1-A are echo clocks that track Q outputs with <±0.1 ns skew. They provide a precise, receiver-side data-valid indication-enabling source-synchronous capture without requiring complex deskew circuitry. Unlike C/C#, CQ/CQ# remain active even when Q outputs are tristated.

UPD46185182BF1-E33-EQ1-A 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:: -

UPD46185182BF1-E33-EQ1-A FAQ

1.How can I place an order for UPD46185182BF1-E33-EQ1-A through Aetrix?

Please submit a Request for Quotation (RFQ) for UPD46185182BF1-E33-EQ1-A 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 UPD46185182BF1-E33-EQ1-A reliable?

The price and inventory of UPD46185182BF1-E33-EQ1-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UPD46185182BF1-E33-EQ1-A is usually 5 days.

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UPD46185182BF1-E33-EQ1-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UPD46185182BF1-E33-EQ1-A 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 UPD46185182BF1-E33-EQ1-A?

For technical support, including UPD46185182BF1-E33-EQ1-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UPD46185182BF1-E33-EQ1-A requirements.

6.How does Aetrix verify that UPD46185182BF1-E33-EQ1-A is sourced from the original manufacturer or authorized distributors?

All UPD46185182BF1-E33-EQ1-A 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 UPD46185182BF1-E33-EQ1-A meets industry standards.

7.What is the process for return or replacement of UPD46185182BF1-E33-EQ1-A?

All UPD46185182BF1-E33-EQ1-A units undergo pre-shipment inspection (PSI). If there is an issue with UPD46185182BF1-E33-EQ1-A, 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 UPD46185182BF1-E33-EQ1-A part is unused and in its original packaging.

Return procedure for UPD46185182BF1-E33-EQ1-A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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