Renesas UPD44324365BF5-E40-FQ1

Overview

UPD44324365BF5-E40-FQ1 from Renesas Electronics is a 1,048,576-word × 36-bit synchronous DDR II SRAM with 4.0 ns clock cycle time (250 MHz), HSTL interface, separate read/write data ports, and 165-pin plastic BGA (15 × 17) packaging. It delivers pipelined double data rate operation for high-bandwidth buffering in network packet processors and FPGA-based protocol accelerators.

For engineers reviewing the UPD44324365BF5-E40-FQ1 datasheet, UPD44324365BF5-E40-FQ1 pinout, UPD44324365BF5-E40-FQ1 application, or UPD44324365BF5-E40-FQ1 equivalent, key selection criteria include burst-2 DDR timing compliance, user-programmable output impedance (35–70 Ω), clock-stop capability (20 μs recovery), and JTAG 1149.1 test access for production validation.

Technical Context

This device implements a synchronous DDR architecture with dual-clock domain control: K/K# registers address/control/data on rising edges, while C/C# govern output timing with echo clocks CQ/CQ# tightly matched to data valid windows. The integrated PLL enables wide output data valid window and supports frequency scaling up to 300 MHz.

It features independent read and write data paths, two-tick burst operation, and internally self-timed write control. Byte write enable (BW0#–BW3#) allows selective 9-bit segment writes across its 36-bit data bus, and DLL# input disables the PLL for low-frequency debug operation with 1-cycle read latency.

Key Specifications

Pinout & Package

UPD44324365BF5-E40-FQ1 is housed in a 165-pin plastic BGA (15 × 17 mm) with ball pitch of 0.8 mm. Pin functions are defined per top-view layout in datasheet pages 4–6, with dedicated address, data, clock, control, power, and test terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2663KV18 and AS7C3365B, UPD44324365BF5-E40-FQ1 uniquely combines 36-bit width, 250 MHz DDR performance, echo clock timing validation, and programmable impedance in a single package-making it optimal for high-integrity, high-throughput buffering where deterministic timing and signal integrity are critical.

Availability

UPD44324365BF5-E40-FQ1 is available at Aetrix Electronics and suitable for network packet buffering, FPGA-based protocol acceleration, telecom line card memory, and high-performance test equipment requiring stable component supply, long-term lifecycle support, and consistent electrical performance across temperature.

Supply support for UPD44324365BF5-E40-FQ1 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 communications infrastructure.

The μPD44324xxx family was designed specifically for high-speed, low-latency DDR II SRAM applications in networking and telecom equipment where precise timing, signal integrity, and burst-mode efficiency are essential.

FAQ

What is the maximum operating frequency supported by UPD44324365BF5-E40-FQ1?

UPD44324365BF5-E40-FQ1 supports a maximum clock frequency of 250 MHz, corresponding to its 4.0 ns clock cycle time rating. This is validated across the full commercial temperature range (0 °C to +70 °C) and includes guaranteed setup/hold timing margins for all control and data signals under HSTL Class I loading conditions.

Does UPD44324365BF5-E40-FQ1 support true dual-port operation?

UPD44324365BF5-E40-FQ1 does not support simultaneous independent read and write operations on the same address. It implements separate read and write data buses (Q[0:35] and D[0:35]) with pipelined DDR timing, enabling high-efficiency burst-2 transfers-but read and write cycles are controlled by LD# and R,W# and occur sequentially per bus cycle.

How is output impedance calibrated on UPD44324365BF5-E40-FQ1?

Output impedance calibration on UPD44324365BF5-E40-FQ1 is performed via the ZQ pin, which connects to an external resistor (RQ) to ground. The device sets Q, CQ, and CQ# output impedance to 0.2 × RQ, supporting 35–70 Ω adjustment. Calibration occurs automatically every 20 μs after power-up and tracks voltage/temperature drift.

Can UPD44324365BF5-E40-FQ1 operate without the PLL enabled?

Yes - UPD44324365BF5-E40-FQ1 can operate with the PLL disabled by asserting DLL# LOW. In this mode, read latency reduces to 1.0 clock cycle and operation is supported down to 120 MHz, though AC/DC characteristics are not guaranteed per datasheet specifications.

What is the purpose of CQ and CQ# pins on UPD44324365BF5-E40-FQ1?

CQ and CQ# are echo clock outputs tightly matched to Q[0:35] data transitions (±0.1 ns skew). They provide hardware-validated timing references for the receiving device to sample output data, eliminating reliance on board-level clock routing accuracy and simplifying high-speed interface design.