Renesas UPD44164184BF5-E40-EQ3-A

Overview

UPD44164184BF5-E40-EQ3-A from Renesas Electronics is a 1,048,576-word × 18-bit synchronous double data rate (DDR) SRAM with pipelined burst operation, HSTL interface, and PLL-based timing control. It operates at 250 MHz (4.0 ns cycle time), supports 1.8 V core supply and 1.4–1.8 V I/O supply, and is packaged in a 165-pin plastic BGA (13 × 15 mm). It serves as high-speed buffer memory in network packet processors and telecom line cards requiring precise DDR timing and low-latency burst access.

For engineers reviewing the UPD44164184BF5-E40-EQ3-A datasheet, UPD44164184BF5-E40-EQ3-A pinout, UPD44164184BF5-E40-EQ3-A application, or UPD44164184BF5-E40-EQ3-A equivalent, key selection considerations include its 4-word linear burst mode, user-programmable output impedance (35–70 Ω), clock-stop capability with 20 μs recovery, dual input/output clock pairs (K/K# and C/C#), and JTAG 1149.1 test port compliance.

Technical Context

This DDR II SRAM uses full-CMOS six-transistor memory cells and integrates synchronous peripheral circuitry including a burst counter, DLL/PLL for output timing stabilization, and echo clocks (CQ/CQ#) tightly matched to data outputs. All inputs are registered on the rising edges of K and K#, while data outputs are synchronized to C and C#-enabling precise flight-time matching between clock and data paths to receiving devices.

The device implements pipelined double data rate operation with two-tick burst addressing, internally self-timed write control, and common DQ bus for read/write. Its HSTL Class I-compliant I/Os support 1.8 V supply with VREF = VDDQ/2 reference, and ZQ pin enables dynamic output impedance tuning via external resistor to ground.

Key Specifications

Pinout & Package

Package: 165-pin plastic BGA (13 × 15 mm grid, 0.8 mm pitch), lead-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1551KV18-400BZI and IS42S16160J-4BL, the UPD44164184BF5-E40-EQ3-A delivers guaranteed low-jitter DDR timing via CQ/CQ# echo clocks and on-die impedance tuning - making it uniquely suited for systems where signal integrity and burst predictability outweigh raw bandwidth or cost targets.

Availability

UPD44164184BF5-E40-EQ3-A is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, baseband processing cache, and industrial real-time controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for UPD44164184BF5-E40-EQ3-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 μPD44164184B family was designed specifically for high-speed, deterministic DDR memory applications in networking and communications equipment where precise timing, low latency, and signal integrity are critical.

FAQ

What is the operating temperature range for UPD44164184BF5-E40-EQ3-A?

The UPD44164184BF5-E40-EQ3-A is rated for an operating ambient temperature range of 0 °C to +70 °C, as indicated by the "E" suffix in the ordering code. This distinguishes it from the "EY" variants rated for −40 °C to +85 °C. Thermal resistance (θ_ja) is 21.4 °C/W under 4-layer board, 0 m/s airflow conditions.

How does the ZQ pin function in UPD44164184BF5-E40-EQ3-A?

The ZQ pin in UPD44164184BF5-E40-EQ3-A connects to an external resistor to ground to calibrate output driver impedance. The device sets DQ, CQ, and CQ# output impedance to 0.2 × R_Q, supporting 35–70 Ω range. It cannot be left unconnected or tied directly to GND; minimum recommended R_Q is 175 Ω. Calibration occurs automatically every 20 μs after power-up.

Can UPD44164184BF5-E40-EQ3-A operate without using the C and C# output clocks?

Yes - UPD44164184BF5-E40-EQ3-A can operate with C and C# fixed HIGH, causing output data to be referenced to K and K# instead. This simplifies clock routing but forfeits the flight-time matching benefit of the dedicated output clock pair. The device guarantees operation only when C/C# are either actively driven or fixed HIGH; toggling them is not supported.

What is the purpose of the DLL# pin on UPD44164184BF5-E40-EQ3-A?

The DLL# pin disables the internal PLL when pulled LOW, allowing debug-mode operation at frequencies below 120 MHz without PLL lock. However, AC/DC characteristics are not guaranteed in this mode, and read latency changes to 1.0 clock cycle. For normal operation, DLL# must be HIGH - typically tied to VDDQ via ≤10 kΩ resistor.

Does UPD44164184BF5-E40-EQ3-A support JTAG boundary scan testing?

Yes - UPD44164184BF5-E40-EQ3-A implements IEEE 1149.1 JTAG with TCK, TMS, TDI, and TDO pins. It supports IDCODE, BYPASS, and boundary scan registers. TCK must be tied to VSS if JTAG is unused. JTAG I/O levels are 1.8 V compatible, and DC/AC characteristics are specified separately in the datasheet.