Renesas UPD46185184BF1-E40-EQ1-A

Overview

UPD46185184BF1-E40-EQ1-A from Renesas Electronics is a 1,048,576-word × 18-bit (18M-bit) synchronous Quad Data Rate II (QDR II) SRAM with HSTL interface, 4-word burst operation, 4.0 ns clock cycle time (250 MHz), and 1.8 V core supply. It features separate read/write data ports, PLL-based output timing control, and clock-stop capability for low-power standby. It is used in high-speed networking buffers, packet classification engines, and FPGA co-processor memory subsystems.

For engineers reviewing the UPD46185184BF1-E40-EQ1-A datasheet, UPD46185184BF1-E40-EQ1-A pinout, UPD46185184BF1-E40-EQ1-A application, or UPD46185184BF1-E40-EQ1-A equivalent, this page delivers verified electrical parameters, validated BGA pin mapping, real-world use scenarios, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

This QDR II SRAM implements dual-clock architecture: K/K# registers address/control on rising edges, while C/C# govern output data timing with precise flight-time matching. Its internal burst counter and independent read/write ports enable concurrent transactions without bus arbitration overhead.

The device integrates a PLL for jitter-tolerant output data valid window extension and supports user-programmable output impedance (35–70 Ω) via ZQ calibration. It uses HSTL Class I I/O with VREF = VDDQ/2 and supports clock-stop mode with full operational recovery within 20 μs.

Key Specifications

Pinout & Package

UPD46185184BF1-E40-EQ1-A is housed in a 165-pin plastic BGA (13 × 15 mm, 0.8 mm pitch) with standard top-side index mark. The package supports automated optical inspection and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD46185184BF1-E40-EQ1-A, CY7C1721KV18-400BZI offers higher bandwidth but demands stricter power integrity and lacks clock-stop mode, while AS7C31026B-15JIN sacrifices all QDR advantages for simplicity and cost-making UPD46185184BF1-E40-EQ1-A optimal for deterministic high-speed data-path buffering.

Availability

UPD46185184BF1-E40-EQ1-A is available at Aetrix Electronics and suitable for high-speed networking equipment, FPGA-based accelerators, telecom baseband modules, and real-time video processing systems requiring stable component supply and long-term lifecycle support.

Supply support for UPD46185184BF1-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 UPD46185184BF1-E40-EQ1-A belongs to Renesas' QDR II SRAM product line, engineered for deterministic, low-latency, high-bandwidth memory interfacing in packet-processing and real-time signal-path applications.

FAQ

What is the maximum operating frequency of UPD46185184BF1-E40-EQ1-A?

The UPD46185184BF1-E40-EQ1-A is rated for 250 MHz operation with a 4.0 ns clock cycle time. Its internal PLL supports scaling up to 300 MHz in the E33 variant, but the E40 version is characterized and guaranteed only at 250 MHz under specified voltage and temperature conditions.

Does UPD46185184BF1-E40-EQ1-A support true simultaneous read and write operations?

Yes, UPD46185184BF1-E40-EQ1-A features physically separate read and write data ports (Q[0:17] and D[0:17]) and independent address paths, enabling concurrent read and write transactions without arbitration delay or bus turnaround cycles.

How is output impedance calibrated on UPD46185184BF1-E40-EQ1-A?

Output impedance is calibrated using the ZQ pin: connect an external resistor RQ from ZQ to ground, and the device sets Q, CQ, and CQ# output impedance to 0.2 × RQ. Supported range is 35–70 Ω, corresponding to RQ = 175–350 Ω.

Can UPD46185184BF1-E40-EQ1-A operate without the PLL enabled?

Yes - asserting DLL# = LOW disables the PLL, allowing operation at frequencies below 120 MHz for debug or low-power modes. However, AC/DC characteristics are not guaranteed in this mode, and normal operation requires DLL# = HIGH tied to VDDQ.

What is the purpose of the C and C# pins on UPD46185184BF1-E40-EQ1-A?

C and C# are output clock pairs that control data output timing: C# rising edge clocks first/third data words, and C rising edge clocks second/fourth words. They enable precise flight-time matching between clock and data; if unused, they must be tied HIGH to default to K/K#-synchronized output.