Renesas UPD44325092BF5-E40-FQ1-A

Overview

UPD44325092BF5-E40-FQ1-A from Renesas Electronics is a 4,194,304-word × 9-bit synchronous QDR II SRAM with 4.0 ns clock cycle time (250 MHz), 1.8 V core supply, HSTL interface, and 165-pin plastic BGA (15 × 17) package. It supports 2-word burst reads/writes, concurrent read/write ports, and clock-stop mode with 20 μs recovery - deployed in high-speed network packet buffers and FPGA co-processor memory subsystems.

For engineers reviewing the UPD44325092BF5-E40-FQ1-A datasheet, UPD44325092BF5-E40-FQ1-A pinout, UPD44325092BF5-E40-FQ1-A application, or UPD44325092BF5-E40-FQ1-A equivalent, key selection criteria include DDR-compatible timing margins, HSTL I/O compliance, output impedance programmability (35–70 Ω), PLL-enabled data valid window control, and JTAG 1149.1 test access for production validation.

Technical Context

This QDR II SRAM uses dual-clock architecture: K/K# for address/control/data registration and C/C# for output timing reference, enabling precise flight-time matching between clock and data. Its internal burst counter and separate read/write data paths allow true concurrent transactions without bus arbitration overhead.

The device integrates a PLL for jitter-tolerant operation down to 120 MHz, DLL# input to disable PLL during debug, and ZQ pin for dynamic output impedance calibration against system trace impedance. All I/Os conform to JEDEC HSTL Class I standards with VREF = VDDQ/2 reference.

Key Specifications

Pinout & Package

165-pin plastic BGA (15 × 17 mm) with 0.8 mm pitch; top-side index mark per package drawing. Ball grid includes dedicated HSTL I/Os, dual clock pairs (K/K#, C/C#), echo clocks (CQ/CQ#), JTAG TAP (TMS/TDI/TCK/TDO), and ZQ impedance calibration input.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2665KV18-400BZI and AS7C33256P-15JIN, UPD44325092BF5-E40-FQ1-A delivers optimal balance of 250 MHz QDR performance, 1.8 V compatibility, and HSTL signal integrity - making it preferred for new 10G+ infrastructure designs where power, timing margin, and pin count are constrained.

Availability

UPD44325092BF5-E40-FQ1-A is available at Aetrix Electronics and suitable for high-speed networking equipment, FPGA-based accelerators, wireless baseband subsystems, and automated test instrumentation requiring stable component supply and long-term lifecycle assurance.

Supply support for UPD44325092BF5-E40-FQ1-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, and infrastructure markets.

The μPD44325xxx series was designed specifically for QDR II applications demanding concurrent read/write bandwidth, sub-5 ns cycle times, and HSTL-compliant interfaces in networking and telecom equipment.

FAQ

What is the maximum operating frequency supported by UPD44325092BF5-E40-FQ1-A?

The UPD44325092BF5-E40-FQ1-A is rated for 250 MHz operation with a 4.0 ns clock cycle time. Its AC characteristics are fully specified at this frequency under TA = 0 to +70°C and VDD = 1.8 ± 0.1 V. While the underlying QDR II architecture supports up to 300 MHz (E33 variant), the E40 speed grade guarantees timing margins only at 250 MHz.

Does UPD44325092BF5-E40-FQ1-A support true concurrent read and write operations?

Yes, UPD44325092BF5-E40-FQ1-A features physically separate read and write data ports with independent control logic. This allows simultaneous READ and WRITE transactions without bus contention or arbitration delay - confirmed by the block diagram and truth table in the datasheet.

How is output impedance calibrated on UPD44325092BF5-E40-FQ1-A?

Output impedance is calibrated via the ZQ pin: connect an external resistor (175–350 Ω) from ZQ to ground to set Q, CQ, and CQ# driver impedance to 35–70 Ω. The device performs automatic calibration every 20 μs after power-up to compensate for voltage/temperature drift.

Can UPD44325092BF5-E40-FQ1-A operate without the PLL enabled?

Yes - asserting DLL# = LOW disables the PLL, allowing operation at frequencies below TKHKH (MAX) for debug purposes. However, AC/DC electrical characteristics are not guaranteed in this mode, and full timing compliance requires DLL# = HIGH during normal operation.

What is the function of the CQ and CQ# pins on UPD44325092BF5-E40-FQ1-A?

CQ and CQ# are synchronous echo clock outputs whose rising edges are tightly matched to Q data outputs. They serve as hardware data-valid strobes independent of C/C# state - critical for capturing Q data reliably in high-speed systems where clock skew must be minimized.