Renesas UPD44165184BF5-E40-EQ3

Overview

UPD44165184BF5-E40-EQ3 from Renesas Electronics is a 1,048,576-word × 18-bit synchronous Quad Data Rate II (QDR II) SRAM with 4-word burst operation, 1.8 V core supply, HSTL interface, and 165-pin plastic BGA (13 × 15 mm) packaging. It delivers 250 MHz clock frequency (4.0 ns cycle time), supports concurrent read/write ports, and targets high-bandwidth buffer applications in networking switches and packet processors.

For engineers reviewing the UPD44165184BF5-E40-EQ3 datasheet, UPD44165184BF5-E40-EQ3 pinout, UPD44165184BF5-E40-EQ3 application, or UPD44165184BF5-E40-EQ3 equivalent, key selection considerations include its dual-clock DDR timing (K/K# input, C/C# output), user-programmable output impedance (35–70 Ω), clock-stop capability (20 μs recovery), and JTAG 1149.1 test access.

Technical Context

This QDR II SRAM uses full-CMOS six-transistor memory cells and integrates synchronous peripheral circuitry including a burst counter and PLL-based DLL for wide data-valid windows. All address, control, and data inputs are registered on rising edges of K and K#, enabling precise DDR timing without external phase alignment.

It implements separate independent read and write data paths with concurrent transaction support, 100% bus utilization during DDR READ/WRITE, and internally self-timed write control. Output clocks C and C# deliver synchronized data with matched flight time, while echo clocks CQ/CQ# provide tight data-valid indication aligned to output data edges.

Key Specifications

Pinout & Package

UPD44165184BF5-E40-EQ3 is housed in a 165-pin plastic BGA package (13 mm × 15 mm, 1.0 mm ball pitch). The package supports standard reflow profiles and provides mechanical and thermal performance suitable for high-density PCB layouts in telecom infrastructure.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1721KV18-400BZI and AS7C31026B-25JIN, UPD44165184BF5-E40-EQ3 delivers optimized trade-offs between 250 MHz bandwidth, low-voltage operation, and pin-compatible upgrade path within Renesas' QDR II family - making it ideal for power-constrained telecom infrastructure where 4.0 ns timing suffices.

Availability

UPD44165184BF5-E40-EQ3 is available at Aetrix Electronics and suitable for high-speed network switch buffers, packet processor look-up tables, and optical transport framing buffers requiring stable component supply across extended temperature ranges (0°C to 70°C).

Supply support for UPD44165184BF5-E40-EQ3 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.

UPD44165184BF5-E40-EQ3 belongs to Renesas' QDR II SRAM product line, engineered specifically for high-throughput, low-latency buffering in networking and communications equipment where concurrent access and precise DDR timing are essential.

FAQ

What is the maximum clock frequency supported by UPD44165184BF5-E40-EQ3?

The UPD44165184BF5-E40-EQ3 supports a maximum clock frequency of 250 MHz, corresponding to a 4.0 ns cycle time as specified in its ordering code suffix "-E40". This rating is guaranteed across the commercial temperature range (0°C to 70°C) with 1.8 V ±0.1 V supply and compliant AC operating conditions. Exceeding this frequency may result in timing violations or data corruption.

Does UPD44165184BF5-E40-EQ3 support true dual-port operation with simultaneous read and write?

Yes, UPD44165184BF5-E40-EQ3 supports true concurrent read and write operations through physically separate data paths. Its architecture allows initiation of a READ cycle on one port and a WRITE cycle on the other within the same clock period, provided command signals (R# and W#) are asserted correctly and address/data setup/hold times are met - enabling zero-cycle interlock in pipeline designs.

How is output impedance calibrated on UPD44165184BF5-E40-EQ3?

Output impedance calibration on UPD44165184BF5-E40-EQ3 is performed via the ZQ pin, which connects to an external resistor (RQ) to ground. The device sets Q, CQ, and CQ# output driver impedance to 0.2 × RQ, supporting programmable values from 35 Ω to 70 Ω. Calibration occurs automatically every 20 μs after power-up and tracks voltage/temperature drift - no software or external command is required.

Can UPD44165184BF5-E40-EQ3 operate without the internal DLL enabled?

Yes, UPD44165184BF5-E40-EQ3 can operate with the internal DLL disabled by asserting DLL# = LOW. In this mode, the device functions without PLL-based clock multiplication, allowing reliable operation at frequencies below 120 MHz. However, AC/DC electrical characteristics are not guaranteed in DLL-bypass mode, and it is intended only for system debug - normal operation requires DLL# = HIGH.

What is the role of C and C# pins on UPD44165184BF5-E40-EQ3?

The C and C# pins on UPD44165184BF5-E40-EQ3 serve as user-controlled output clocks that define the timing reference for data outputs Q[0–17]. C# rising edges clock the first and third data words of a burst, while C rising edges clock the second and fourth - enabling precise skew-matched delivery to the receiving device. If unused, C and C# must be fixed HIGH to default to K/K#-timed output.