Renesas UPD44325184BF5-E33-FQ1

Overview

UPD44325184BF5-E33-FQ1 from Renesas Electronics is a 2,097,152-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 (15 × 17) package. It supports concurrent read/write operations, four-word burst, and PLL-based output timing for high-speed networking buffer applications.

For engineers reviewing the UPD44325184BF5-E33-FQ1 datasheet, UPD44325184BF5-E33-FQ1 pinout, UPD44325184BF5-E33-FQ1 application, or UPD44325184BF5-E33-FQ1 equivalent, key selection criteria include QDR II burst timing compliance, HSTL-1 I/O compatibility, 18-bit wide data path, 300 MHz operation under 0–70°C ambient, and impedance-programmable outputs via ZQ pin.

Technical Context

This QDR II SRAM uses dual-clock architecture: K/K# registers address/control on rising edges and latches input data across both K and K# edges, while C/C# control output timing with precise flight-time matching. Its internal burst counter and separate read/write data ports enable true concurrent transactions without arbitration delay.

The device integrates a PLL for jitter-tolerant output data valid window extension and supports clock-stop mode with 20 μs recovery. User-programmable output impedance (35–70 Ω) via external ZQ resistor enables dynamic bus termination matching to system trace impedance.

Key Specifications

Pinout & Package

165-pin plastic BGA (15 × 17 mm), 0.8 mm ball pitch, RoHS-compliant lead-free construction. Pin mapping follows μPD44325184B-specific top-view arrangement with dedicated address, data, control, clock, and power balls.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD44325184BF5-E33-FQ1, CY7C2663KV18 offers higher reliability margins and extended temperature support but requires firmware adaptation for QDR II+ modes, while AS7C33618B provides pin-compatible cost reduction at the expense of 17% bandwidth and missing impedance tuning.

Availability

UPD44325184BF5-E33-FQ1 is available at Aetrix Electronics and suitable for high-speed network switch buffers, telecom line card packet memory, and industrial real-time control FIFOs requiring stable component supply across multi-year production cycles.

Supply support for UPD44325184BF5-E33-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The μPD44325xxx family targets high-performance packet buffering in networking and telecom equipment, delivering QDR II architecture optimized for deterministic latency, concurrent access, and HSTL interoperability with FPGA-based controllers.

FAQ

What is the maximum guaranteed clock frequency for UPD44325184BF5-E33-FQ1?

The UPD44325184BF5-E33-FQ1 is rated for 300 MHz operation with a 3.3 ns clock cycle time, validated across 0°C to +70°C ambient temperature and 1.7–1.9 V VDD supply. This frequency is guaranteed per the R10DS0039EJ0200 datasheet Rev.2.00 timing specifications under standard HSTL loading conditions.

Does UPD44325184BF5-E33-FQ1 support independent read and write operations simultaneously?

Yes, UPD44325184BF5-E33-FQ1 implements true concurrent read and write ports with separate 18-bit data paths. The device allows overlapping read and write bursts without arbitration delay, provided R# and W# are not asserted on the same K clock edge-read commands take precedence when both are active.

How is output impedance calibrated on UPD44325184BF5-E33-FQ1?

UPD44325184BF5-E33-FQ1 uses the ZQ pin to calibrate output driver impedance. A precision resistor (RQ) is connected from ZQ to ground, setting Q, CQ, and CQ# output impedance to 0.2 × RQ. Supported range is 35–70 Ω, corresponding to RQ = 175–350 Ω, with automatic recalibration every 20 μs after power-up.

What is the function of the C and C# pins on UPD44325184BF5-E33-FQ1?

The C and C# pins on UPD44325184BF5-E33-FQ1 serve as user-controlled output clocks. C# times the first and third words of a 4-word burst, while C times the second and fourth. They enable precise flight-time matching between clock and data at the receiver, and must be held HIGH if K/K# are used instead for output timing.

Can UPD44325184BF5-E33-FQ1 operate with stopped clocks, and what is the recovery time?

Yes, UPD44325184BF5-E33-FQ1 supports clock-stop mode: when K/K# are halted, the device retains state and resumes normal operation within 20 μs after clock restart. During stop, C/C# and CQ/CQ# also halt, but output drivers remain in last state-not tristated-ensuring deterministic behavior in low-power states.