Renesas UPD44325084BF5-E40-FQ1

Overview

UPD44325084BF5-E40-FQ1 from Renesas Electronics is a 4,194,304-word × 8-bit synchronous Quad Data Rate II (QDR II) SRAM with 4-word burst operation, 1.8 V supply, HSTL interface, and 4.0 ns clock cycle time (250 MHz). It delivers concurrent read/write ports, 100% bus utilization, and PLL-based output timing control for high-speed networking and packet buffering applications.

For engineers reviewing the UPD44325084BF5-E40-FQ1 datasheet, UPD44325084BF5-E40-FQ1 pinout, UPD44325084BF5-E40-FQ1 application, or UPD44325084BF5-E40-FQ1 equivalent, key selection considerations include its 165-pin plastic BGA (15 × 17) package, HSTL I/O compatibility, user-programmable output impedance (35–70 Ω), clock-stop capability (20 μs recovery), and JTAG 1149.1 test access.

Technical Context

The UPD44325084BF5-E40-FQ1 implements a dual-clock architecture with independent K/K# input clocks for address/control/data registration and C/C# output clocks for precise data delivery timing. Its internal PLL enables wide output data valid windows and supports future frequency scaling up to 300 MHz.

It features separate read and write data paths enabling true concurrent transactions, internally self-timed write control, and four-tick burst addressing that reduces effective address bus frequency by 4×. The device uses full-CMOS six-transistor memory cells and supports HSTL Class I signaling with VREF-referenced inputs.

Key Specifications

Pinout & Package

UPD44325084BF5-E40-FQ1 is housed in a 165-pin plastic BGA (15 × 17 mm) with ball pitch of 1.0 mm. Pin functions are defined per top-view layout in Renesas datasheet R10DS0039EJ0200.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2665KV18-400BZI and AS7C33256PFS-25BIN, the UPD44325084BF5-E40-FQ1 uniquely balances 8-bit width, 250 MHz QDR II performance, HSTL compatibility, and 165-pin BGA packaging-making it optimal for space-constrained, high-throughput packet buffering where precise timing and concurrent access are mandatory.

Availability

UPD44325084BF5-E40-FQ1 is available at Aetrix Electronics and suitable for high-speed network switch buffers, telecom line card packet memory, and FPGA-based baseband processor caches requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.

Supply support for UPD44325084BF5-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 Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and communications markets.

The UPD44325084BF5-E40-FQ1 belongs to Renesas' QDR II SRAM product line, engineered specifically for high-bandwidth, low-latency packet buffering and cache applications in networking infrastructure and test equipment.

FAQ

What is the maximum guaranteed clock frequency for UPD44325084BF5-E40-FQ1?

The UPD44325084BF5-E40-FQ1 is rated for a 4.0 ns clock cycle time, corresponding to a maximum guaranteed operating frequency of 250 MHz under specified conditions (TA = 0 to 70°C, VDD = 1.8 V ± 0.1 V). This rating includes full timing margin for setup/hold, propagation, and output validity windows as defined in Renesas datasheet R10DS0039EJ0200.

Does UPD44325084BF5-E40-FQ1 support true concurrent read and write operations?

Yes, UPD44325084BF5-E40-FQ1 supports true concurrent read and write operations via physically separate data paths. The device allows simultaneous initiation of READ and WRITE cycles-subject to the constraint that R# and W# cannot both be asserted on the same K clock edge. When both are active, read takes precedence, ensuring deterministic behavior in shared-memory architectures.

How is output impedance calibrated on UPD44325084BF5-E40-FQ1?

Output impedance on UPD44325084BF5-E40-FQ1 is calibrated using the ZQ pin, which connects to an external precision resistor (RQ) to ground. The device sets Q, CQ, and CQ# output impedance to 0.2 × RQ. Typical RQ values yield 35–70 Ω range. Calibration occurs automatically every 20 μs after power-up and adjusts for temperature and supply drift-no software command is required.

Can UPD44325084BF5-E40-FQ1 operate without the PLL enabled?

Yes, UPD44325084BF5-E40-FQ1 can operate with the PLL disabled by pulling DLL# LOW. However, this mode is intended only for debug or low-frequency validation (<120 MHz); AC/DC characteristics-including timing parameters-are not guaranteed outside the specified operating range. For production use at 250 MHz, DLL# must be held HIGH (e.g., tied to VDDQ via ≤10 kΩ resistor).

What is the function of CQ and CQ# pins on UPD44325084BF5-E40-FQ1?

CQ and CQ# are synchronous echo clock outputs on UPD44325084BF5-E40-FQ1. Their rising edges are tightly matched to the corresponding Q data outputs and serve as hardware-valid indicators for received data. Unlike C/C#, CQ/CQ# continue running even when Q outputs are tristated, enabling reliable data capture timing in systems where output enable is dynamically controlled.