Renesas UPD46365362BF1-E40-EQ1-A

Overview

UPD46365362BF1-E40-EQ1-A from Renesas Electronics is a 1,048,576-word × 36-bit synchronous quad data rate (QDR II) SRAM with 1.8 V core supply, 4.0 ns clock cycle time (250 MHz), 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 packet buffering for network switches and routers.

For engineers reviewing the UPD46365362BF1-E40-EQ1-A datasheet, UPD46365362BF1-E40-EQ1-A pinout, UPD46365362BF1-E40-EQ1-A application, or UPD46365362BF1-E40-EQ1-A equivalent, key selection criteria include its 36-bit wide I/O, dual-clock timing architecture (K/K# for input, C/C# for output), user-programmable output impedance (35–70 Ω), JTAG 1149.1 test port, and clock-stop capability with 20 μs recovery.

Technical Context

The UPD46365362BF1-E40-EQ1-A implements a true dual-port QDR II architecture with physically separate read and write data paths, enabling simultaneous access without arbitration. Its internal PLL provides a wide output data valid window and supports future frequency scaling up to 300 MHz.

It uses HSTL Class I I/O with VREF-referenced inputs and programmable output impedance via ZQ calibration. All control and address signals are registered on the rising edge of K, while write data is latched on both K and K# edges-enabling precise DDR timing alignment and eliminating external phase-matching circuitry.

Key Specifications

Pinout & Package

UPD46365362BF1-E40-EQ1-A is housed in a 165-pin plastic BGA (13 × 15 array, 1.0 mm pitch) with exposed thermal pad. Pin functions follow the μPD46365362B-specific layout defined in R10DS0089EJ0400 Rev.4.00 Page 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2663KV18-400BZXC and AS7C33618B-20JIN, UPD46365362BF1-E40-EQ1-A uniquely balances 250 MHz performance, 1.8 V efficiency, and integrated calibration-making it optimal for new cost-sensitive, thermally constrained networking and test equipment designs.

Availability

UPD46365362BF1-E40-EQ1-A is available at Aetrix Electronics and suitable for network packet buffering, high-speed test equipment memory, baseband signal processing, and industrial real-time control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.

Supply support for UPD46365362BF1-E40-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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT markets.

The μPD46365xxx family was designed specifically for high-bandwidth, low-latency buffering in networking and communications infrastructure-emphasizing QDR II architecture, HSTL signaling, and robust thermal performance in compact BGA packages.

FAQ

What is the maximum operating frequency of the UPD46365362BF1-E40-EQ1-A?

The UPD46365362BF1-E40-EQ1-A is rated for 250 MHz operation with a 4.0 ns clock cycle time. While the same μPD46365362B die supports 300 MHz (3.3 ns) in the -E33 variant, the -E40 suffix confirms this specific part is characterized and guaranteed for 250 MHz across 0°C to 70°C ambient temperature. Exceeding this frequency violates AC specifications and may cause timing violations.

Does the UPD46365362BF1-E40-EQ1-A support independent byte writes?

Yes, the UPD46365362BF1-E40-EQ1-A supports four independent 9-bit byte writes using BW0# through BW3#. When BW0# is LOW and others HIGH, only D0–D8 are written; BW1# LOW enables D9–D17, and so on. This allows partial-word updates without read-modify-write cycles, critical for efficient packet header manipulation in networking applications.

How does the ZQ pin function on the UPD46365362BF1-E40-EQ1-A?

The ZQ pin on the UPD46365362BF1-E40-EQ1-A calibrates output driver impedance by connecting to an external precision resistor (typically 240 Ω) to ground. The device measures this resistance and adjusts Q, CQ, and CQ# output drivers to 0.2 × RQ (e.g., 48 Ω). Calibration occurs automatically every 20 μs after power-up to compensate for voltage/temperature drift, ensuring consistent signal integrity.

Can the UPD46365362BF1-E40-EQ1-A operate without its PLL enabled?

Yes-the UPD46365362BF1-E40-EQ1-A can operate with the PLL disabled by asserting DLL# LOW. In this mode, read latency reduces to 1.0 clock cycle, but AC/DC characteristics are not guaranteed. For production operation, DLL# must be tied HIGH (e.g., to VDDQ via ≤10 kΩ) to enable the PLL, which provides the wide data-valid window and jitter tolerance required for 250 MHz reliability.

What is the purpose of the CQ and CQ# pins on the UPD46365362BF1-E40-EQ1-A?

The CQ and CQ# pins on the UPD46365362BF1-E40-EQ1-A are synchronous echo clocks that track Q0–Q35 output timing with ±0.1 ns matching. They provide a hardware data-valid strobe for the receiving device-eliminating the need for complex deskew circuits or margin-heavy timing budgets. Unlike C/C#, CQ/CQ# remain active even when Q outputs are tristated, supporting robust handshaking in burst-oriented systems.