Renesas UPD44325362BF5-E40-FQ1-A

Overview

UPD44325362BF5-E40-FQ1-A from Renesas Electronics is a 1,048,576-word × 36-bit synchronous Quad Data Rate II (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) packaging. It supports concurrent read/write operations, burst-2 DDR transactions, and is used in high-bandwidth networking buffers and packet forwarding engines.

For engineers reviewing the UPD44325362BF5-E40-FQ1-A datasheet, UPD44325362BF5-E40-FQ1-A pinout, UPD44325362BF5-E40-FQ1-A application, or UPD44325362BF5-E40-FQ1-A equivalent, key selection considerations include its 36-bit wide synchronous interface, dual-clock (K/K# and C/C#) timing architecture, user-programmable output impedance (35–70 Ω), PLL-enabled output data valid window, and JTAG 1149.1 test access support.

Technical Context

This QDR II SRAM implements separate read and write data ports with independent address latching on K (read) and K# (write) rising edges. Its internal burst counter and echo clocks (CQ/CQ#) tightly align output data to system timing, enabling precise flight-time matching between clock and data at 250 MHz.

The device integrates a PLL for jitter tolerance and wide data valid windows, supports clock-stop mode with 20 μs recovery, and uses HSTL Class I I/O with VREF-referenced inputs. Output impedance is calibrated via ZQ pin using an external resistor to ground, and byte-write control is implemented through four active-low BW0#–BW3# signals.

Key Specifications

Pinout & Package

Package: 165-pin plastic BGA (15 × 17 mm), lead-free, RoHS-compliant.

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-25JIN, the UPD44325362BF5-E40-FQ1-A delivers optimal balance of proven 250 MHz QDR II performance, integrated impedance tuning, and mature industrial qualification - making it ideal for volume production in telecom and networking infrastructure where reliability and timing predictability outweigh peak speed needs.

Availability

UPD44325362BF5-E40-FQ1-A is available at Aetrix Electronics and suitable for high-bandwidth network switching, telecom line card buffering, and baseband processor cache applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for UPD44325362BF5-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 UPD44325362BF5-E40-FQ1-A belongs to Renesas' QDR II SRAM product line, engineered specifically for high-throughput, low-latency buffering in networking and communications equipment where deterministic timing and concurrent access are essential.

FAQ

What is the maximum operating frequency supported by the UPD44325362BF5-E40-FQ1-A?

The UPD44325362BF5-E40-FQ1-A is rated for 250 MHz operation with a 4.0 ns clock cycle time. This specification is validated across the full commercial temperature range (0 °C to +70 °C) and includes margin for setup/hold timing, jitter, and voltage variation. Operation above 250 MHz is not guaranteed and exceeds the device's qualified performance envelope.

Does the UPD44325362BF5-E40-FQ1-A support true concurrent read and write operations?

Yes, the UPD44325362BF5-E40-FQ1-A implements physically separate read and write data ports with independent address latching - enabling simultaneous read and write transactions on the same clock cycle. This concurrency is fundamental to its QDR II architecture and is confirmed in the datasheet truth table and block diagram.

How is output impedance calibrated on the UPD44325362BF5-E40-FQ1-A?

Output impedance on the UPD44325362BF5-E40-FQ1-A is calibrated via the ZQ pin, which must be connected to a precision resistor (175–350 Ω) to ground. The device internally adjusts Q, CQ, and CQ# driver strength to 0.2 × RQ, yielding 35–70 Ω output impedance. Calibration occurs automatically every 20 μs after power-up.

Can the UPD44325362BF5-E40-FQ1-A operate without its PLL enabled?

The UPD44325362BF5-E40-FQ1-A can operate with the PLL disabled by asserting DLL# LOW, but only for debug or low-frequency operation below 120 MHz. For rated 250 MHz performance, DLL# must be HIGH (tied to VDDQ). AC/DC characteristics are not guaranteed with DLL# LOW, and timing margins degrade significantly.

What is the purpose of the CQ and CQ# pins on the UPD44325362BF5-E40-FQ1-A?

The CQ and CQ# pins on the UPD44325362BF5-E40-FQ1-A are echo clocks synchronized to the Q data outputs. Their rising edges tightly match data validity timing, providing a hardware-generated data-ready signal that eliminates reliance on fixed delay lines or complex timing calculations in the receiving controller.