Renesas UPD46184095BF1-E40-EQ1-A

Overview

UPD46184095BF1-E40-EQ1-A from Renesas Electronics is a 2,097,152-word × 9-bit synchronous DDR II SRAM with HSTL interface, 4.0 ns clock cycle time (250 MHz), 1.8 V core supply, and 165-pin plastic BGA (13 × 15) packaging. It delivers pipelined double data rate operation with separate read/write data ports and supports burst-2 transactions in high-speed networking and test equipment memory buffers.

For engineers reviewing the UPD46184095BF1-E40-EQ1-A datasheet, UPD46184095BF1-E40-EQ1-A pinout, UPD46184095BF1-E40-EQ1-A application, or UPD46184095BF1-E40-EQ1-A equivalent, key selection criteria include DDR timing compliance at 250 MHz, HSTL Class I output drive, user-programmable 35–70 Ω output impedance, echo clock (CQ/CQ#) synchronization, and JTAG 1149.1 test access for production validation.

Technical Context

This device implements a synchronous DDR architecture with dual-clock domain control: K/K# registers address/control/data on rising edges, while C/C# govern output timing with precise flight-time matching. Its internal PLL enables wide output data valid windows and supports future frequency scaling up to 300 MHz.

The memory array uses full-CMOS six-transistor cells and integrates a burst counter, independent read/write data paths, and internally self-timed write control. Clock-stop capability restores normal operation within 20 μs, and DLL# allows PLL bypass during debug without guaranteed AC/DC specs.

Key Specifications

Pinout & Package

165-pin plastic BGA (13 × 15 mm grid, ball pitch 0.8 mm), top-view layout with index mark per package dimensions. Pin functions validated per R10DS0115EJ0200 Rev.2.00 Pages 3–6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD46184095BF1-E40-EQ1-A, CY7C2665KV18 offers higher speed but sacrifices echo clock precision and impedance tuning, while IS61WV102418BLL lacks DDR architecture entirely-making UPD46184095BF1-E40-EQ1-A uniquely suited for deterministic, high-fidelity 9-bit DDR buffering.

Availability

UPD46184095BF1-E40-EQ1-A is available at Aetrix Electronics and suitable for network packet buffering, high-speed test equipment memory, protocol accelerator cache, and industrial motion controller buffer applications requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.

Supply support for UPD46184095BF1-E40-EQ1-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 is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The μPD46184095B product line delivers high-density, low-latency DDR II SRAMs optimized for deterministic data buffering in high-speed communications and real-time control systems.

FAQ

What is the maximum operating frequency supported by UPD46184095BF1-E40-EQ1-A?

The UPD46184095BF1-E40-EQ1-A is rated for a 4.0 ns clock cycle time, corresponding to a maximum operating frequency of 250 MHz. This specification is validated across the full commercial temperature range (0 °C to +70 °C) and includes margin for setup/hold timing compliance under worst-case voltage and process corners. Operation above 250 MHz is not guaranteed and requires use of the faster -E33 variant.

Does UPD46184095BF1-E40-EQ1-A support JTAG boundary-scan testing?

Yes, UPD46184095BF1-E40-EQ1-A implements a IEEE 1149.1-compliant Test Access Port (TAP) with dedicated TCK, TMS, TDI, and TDO pins. The JTAG interface operates at up to 20 MHz and supports basic boundary-scan functionality for production test and board-level diagnostics. TAP reset occurs automatically on power-up, and no external TRST pin is provided.

How does the ZQ pin function in UPD46184095BF1-E40-EQ1-A?

The ZQ pin on UPD46184095BF1-E40-EQ1-A enables dynamic output impedance calibration. When connected to an external resistor (175–350 Ω) to ground, it sets Q, CQ, and CQ# driver impedance to 0.2×RQ. Calibration occurs automatically every 20 μs after power-up and tracks supply voltage and temperature drift, ensuring consistent signal integrity across operating conditions.

Can UPD46184095BF1-E40-EQ1-A operate without its internal PLL enabled?

Yes-asserting DLL# LOW disables the internal PLL, allowing operation at frequencies below the minimum PLL lock threshold (120 MHz). In this mode, read latency reduces to 1.0 clock cycle, but AC/DC electrical characteristics are not guaranteed. For full-specification operation at 250 MHz, DLL# must be held HIGH (tied to VDDQ via ≤10 kΩ resistor).

What is the purpose of the CQ and CQ# outputs on UPD46184095BF1-E40-EQ1-A?

CQ and CQ# are synchronous echo clock outputs tightly matched (±0.1 ns) to the Q data outputs. They provide hardware-level data-valid timing references for downstream logic-eliminating the need for external delay lines or complex clock-data recovery circuits. CQ# aligns with the first burst word, and CQ aligns with the second, enabling precise latch timing in high-speed receivers.