Renesas UPD46365094BF1-E33-EQ1-A

Overview

UPD46365094BF1-E33-EQ1-A from Renesas Electronics is a 4,194,304-word × 9-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 delivers concurrent read/write operations, four-word burst access, and PLL-based output timing control for high-bandwidth networking buffers and packet memory applications.

For engineers reviewing the UPD46365094BF1-E33-EQ1-A datasheet, UPD46365094BF1-E33-EQ1-A pinout, UPD46365094BF1-E33-EQ1-A application, or UPD46365094BF1-E33-EQ1-A equivalent, key selection considerations include its 4M × 9 organization, HSTL I/O compliance, DLL#-controlled PLL enable/disable, user-programmable output impedance (35–70 Ω), and support for independent read/write ports with echo clocks CQ/CQ#.

Technical Context

This QDR II SRAM uses dual-clock architecture: K/K# registers address/control on rising edges and latches input data across both edges, while C/C# govern output timing-enabling precise flight-time matching between clock and data. Its internal burst counter and address register support fixed four-word sequential access without external address incrementing.

The device integrates a PLL for wide output data valid window and frequency scalability, supports clock-stop mode with 20 μs recovery, and implements byte-write control via BW0# to manage all nine data bits. All I/Os comply with JEDEC HSTL Class I standards and use VREF = VDDQ/2 for input threshold referencing.

Key Specifications

Pinout & Package

UPD46365094BF1-E33-EQ1-A is housed in a 165-pin plastic BGA package (13 × 15 mm, ball pitch 0.8 mm), lead-free compliant, with thermal pad exposed on underside for enhanced heat dissipation in high-power-density designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2665KV18 and AS7C36256A, UPD46365094BF1-E33-EQ1-A uniquely combines 300 MHz QDR II performance, 9-bit parity-ready organization, on-die impedance tuning, and echo clock support-making it optimal for next-generation packet memory where timing precision and bandwidth density are critical.

Availability

UPD46365094BF1-E33-EQ1-A is available at Aetrix Electronics and suitable for high-speed network switch buffers, telecom line card packet memory, and baseband processing memory requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for UPD46365094BF1-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 Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT applications.

The UPD46365094BF1-E33-EQ1-A belongs to Renesas' QDR II SRAM product line, engineered specifically for high-bandwidth, low-latency packet buffering in networking and communications equipment where deterministic burst access and precise timing control are essential.

FAQ

What is the memory organization and total capacity of UPD46365094BF1-E33-EQ1-A?

UPD46365094BF1-E33-EQ1-A has a 4,194,304-word × 9-bit organization, delivering 36 Mbit (4.5 Mbyte) of synchronous static RAM. The 9-bit width supports 8-bit data plus 1-bit parity for error detection in mission-critical networking applications. This configuration is distinct from the x8, x18, and x36 variants in the same family.

Does UPD46365094BF1-E33-EQ1-A support concurrent read and write operations?

Yes, UPD46365094BF1-E33-EQ1-A supports true concurrent read and write operations through independent address and data paths. During a burst cycle, it can accept a new write command while delivering read data from a prior request-enabling full-duplex packet buffering without arbitration delay. This capability is confirmed in the block diagram and truth table of the official datasheet.

What is the function of the CQ and CQ# pins on UPD46365094BF1-E33-EQ1-A?

The CQ and CQ# pins on UPD46365094BF1-E33-EQ1-A are synchronous echo clock outputs tightly matched to the Q0–Q8 data outputs. They provide a hardware-accurate data-valid indication for the receiving controller, enabling precise setup/hold margin verification. Unlike C/C#, CQ/CQ# continue running even when outputs are tristated, supporting robust timing analysis in high-speed systems.

How does the ZQ pin affect output impedance calibration on UPD46365094BF1-E33-EQ1-A?

The ZQ pin on UPD46365094BF1-E33-EQ1-A connects to an external resistor (RQ) to ground, allowing automatic calibration of Q, CQ, and CQ# output impedance to 0.2 × RQ. Calibration occurs every 20 μs after power-up to compensate for voltage/temperature drift. Direct connection to VDDQ minimizes impedance; grounding or leaving ZQ floating is prohibited per datasheet specifications.

Can UPD46365094BF1-E33-EQ1-A operate without the PLL enabled?

Yes, UPD46365094BF1-E33-EQ1-A can operate with the PLL disabled by holding DLL# LOW, enabling low-frequency debugging below 120 MHz. However, AC/DC electrical characteristics are not guaranteed in this mode. For full-spec 300 MHz operation-including timing margins and jitter tolerance-DLL# must be held HIGH (typically tied to VDDQ via ≤10 kΩ resistor) to activate the PLL.