Renesas UPD44324185BF5-E40-FQ1

Overview

UPD44324185BF5-E40-FQ1 from Renesas Electronics is a 2,097,152-word × 18-bit synchronous double data rate (DDR II) SRAM with HSTL interface, 1.8 V core supply, 4.0 ns clock cycle time (250 MHz), and 165-pin plastic BGA (15 × 17) packaging. It delivers pipelined DDR read/write operations per cycle for high-bandwidth buffering in network packet processors and baseband signal chains.

For engineers reviewing the UPD44324185BF5-E40-FQ1 datasheet, UPD44324185BF5-E40-FQ1 pinout, UPD44324185BF5-E40-FQ1 application, or UPD44324185BF5-E40-FQ1 equivalent, key selection considerations include its 2-word burst architecture, separate I/O ports, user-programmable output impedance (35–70 Ω), echo clock (CQ/CQ#) timing alignment, and JTAG 1149.1 test port support.

Technical Context

This DDR II SRAM uses full-CMOS six-transistor memory cells and integrates synchronous peripheral circuitry including a burst counter and PLL-based timing engine. All inputs-address, control, and data-are registered on the rising edges of complementary input clocks K and K#, enabling precise DDR timing at 250 MHz with 4.0 ns cycle time.

The device supports dual-clock operation: K/K# for input registration and C/C# for output timing reference, with echo clocks CQ/CQ# tightly matched to data outputs for flight-time compensation. Its separate read/write data ports and two-tick burst mode reduce transaction latency in high-throughput streaming applications.

Key Specifications

Pinout & Package

Package: 165-pin plastic BGA (15 × 17 mm), ball pitch 0.8 mm, lead-free finish. Pinout conforms to μPD44324185B-specific layout (not shared with x36 variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1551KV18 and AS7C33618B, the UPD44324185BF5-E40-FQ1 uniquely combines 1.8 V operation, echo clock timing alignment, and programmable output impedance-enabling tighter signal integrity control in space-constrained, high-speed industrial and telecom PCB layouts.

Availability

UPD44324185BF5-E40-FQ1 is available at Aetrix Electronics and suitable for network packet buffering, baseband signal processing, and industrial motion control requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature.

Supply support for UPD44324185BF5-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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The μPD44324xxxB family was designed specifically for high-bandwidth, low-latency DDR II buffering in telecom infrastructure and test equipment, emphasizing precise timing control, HSTL compatibility, and robust thermal performance in compact BGA packages.

FAQ

What is the maximum guaranteed clock frequency for UPD44324185BF5-E40-FQ1?

The UPD44324185BF5-E40-FQ1 is rated for a maximum clock cycle time of 4.0 ns, corresponding to a guaranteed 250 MHz operation under commercial temperature conditions (0 °C to +70 °C). This rating is validated across all AC parameters including setup/hold times, output valid/hold, and PLL lock behavior per R10DS0037EJ0200 Rev.2.00.

Does UPD44324185BF5-E40-FQ1 support JTAG boundary-scan testing?

Yes, UPD44324185BF5-E40-FQ1 implements IEEE 1149.1-compliant JTAG test access port with dedicated TCK, TMS, TDI, and TDO pins. The interface operates at 1.8 V I/O level and supports basic boundary-scan functionality; TCK must be tied to VSS if unused, per datasheet recommendations.

How does the ZQ pin function in UPD44324185BF5-E40-FQ1?

The ZQ pin in UPD44324185BF5-E40-FQ1 serves as an output impedance calibration input. When connected to a precision resistor to ground, it sets Q, CQ, and CQ# driver strength to 0.2 × RQ. Calibration occurs automatically every 20 µs after power-up and adjusts for VDDQ and temperature drift, enabling dynamic bus termination without external resistors.

Can UPD44324185BF5-E40-FQ1 operate without the PLL enabled?

Yes, UPD44324185BF5-E40-FQ1 can operate with the PLL disabled by pulling DLL# LOW, allowing sub-250 MHz clock frequencies for debug or low-power modes. However, AC/DC characteristics are not guaranteed in this mode, and read latency changes to 1.0 clock cycle; DLL# must be HIGH for production operation per specification.

What is the purpose of CQ and CQ# signals in UPD44324185BF5-E40-FQ1?

CQ and CQ# in UPD44324185BF5-E40-FQ1 are synchronous echo clock outputs tightly matched to data outputs (±0.1 ns). They provide a reliable, on-die data-valid indication referenced to the same timing domain as Q outputs, enabling precise capture at the receiving device regardless of PCB flight time variations.