Renesas UPD44165362BF5-E50-EQ3-A

Overview

UPD44165362BF5-E50-EQ3-A from Renesas Electronics is a 524,288-word × 36-bit (18-Mbit) synchronous Quad Data Rate II (QDR-II) SRAM with 2-word burst operation, HSTL interface, and 1.8 V core supply. It delivers 200 MHz clock frequency (5.0 ns cycle time), supports concurrent read/write ports, and operates in 0 to 70°C ambient temperature. It is used in high-speed networking packet buffers and FPGA co-processor memory subsystems requiring deterministic DDR timing.

For engineers reviewing the UPD44165362BF5-E50-EQ3-A datasheet, UPD44165362BF5-E50-EQ3-A pinout, UPD44165362BF5-E50-EQ3-A application, or UPD44165362BF5-E50-EQ3-A equivalent, key selection considerations include its 165-pin plastic BGA (13×15) package, dual-clock (K/K# and C/C#) timing architecture, user-programmable output impedance (35–70 Ω), PLL-enabled wide data-valid window, and JTAG 1149.1 test access support.

Technical Context

This QDR-II SRAM employs full-CMOS six-transistor memory cells and integrates synchronous peripheral circuitry including a burst counter, DLL/PLL for clock deskew and flight-time matching, and independent read/write data paths enabling true concurrent transactions. Its dual-clock system separates address/control registration (on K/K# rising edges) from output timing (synchronized to C/C# rising edges), ensuring precise DDR data delivery.

The device implements HSTL Class I I/O with programmable termination via ZQ pin, supports clock-stop mode with 20 μs recovery, and uses separate VDD (1.8 V) and VDDQ (1.4–1.8 V) supplies to isolate core logic from I/O drivers. Byte write control (BW0#–BW3#) enables selective 9-bit sub-word writes within the 36-bit data bus.

Key Specifications

Pinout & Package

UPD44165362BF5-E50-EQ3-A is housed in a 165-pin plastic BGA (13 × 15 array, 0.8 mm pitch) with exposed thermal pad. Pin functions are defined per the μPD44165362B-specific top-view layout on page 6 of R10DS0017EJ0200 Rev.2.00.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2663KV18-500BZXC and AS7C33256P-50BIN, UPD44165362BF5-E50-EQ3-A uniquely combines HSTL I/O with on-die impedance tuning and true concurrent ports-enabling tighter timing closure in high-speed serial link buffers without external termination networks.

Availability

UPD44165362BF5-E50-EQ3-A is available at Aetrix Electronics and suitable for high-speed networking packet buffers, FPGA co-processor memory subsystems, and telecom baseband processing requiring stable component supply across extended production lifecycles.

Supply support for UPD44165362BF5-E50-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 μPD44165xxx family was designed specifically for high-bandwidth, low-latency memory interfacing in networking and communications equipment-emphasizing QDR-II timing precision, HSTL compatibility, and robust thermal performance in dense BGA packages.

FAQ

What is the maximum guaranteed clock frequency for UPD44165362BF5-E50-EQ3-A?

The UPD44165362BF5-E50-EQ3-A is rated for 200 MHz operation, corresponding to a 5.0 ns clock cycle time. This is verified across the full 0 to 70°C operating temperature range and 1.7–1.9 V VDD supply. Higher frequencies (e.g., 250 MHz or 287 MHz) require faster speed grades (E40 or E35 suffixes) and are not guaranteed for this specific part number.

Does UPD44165362BF5-E50-EQ3-A support true concurrent read and write operations?

Yes, UPD44165362BF5-E50-EQ3-A features physically independent read and write data paths, allowing simultaneous access to the memory array without arbitration delay. The block diagram on page 9 confirms separate input registers, sense amps, and output buffers for each port-enabling full-duplex operation at 200 MHz.

How is output impedance calibrated on UPD44165362BF5-E50-EQ3-A?

Output impedance is calibrated using the ZQ pin: connect an external resistor (RQ) from ZQ to ground to set Q, CQ, and CQ# driver impedance to 0.2 × RQ. Valid RQ values range from 175 Ω to 350 Ω, yielding 35–70 Ω output impedance. Calibration occurs automatically every 20 μs after power-up and tracks voltage/temperature drift.

Can UPD44165362BF5-E50-EQ3-A operate without the PLL enabled?

Yes-asserting DLL# = LOW disables the PLL, allowing operation at reduced clock frequencies (<120 MHz) for debug or low-power modes. However, AC/DC characteristics are not guaranteed in this mode, and full timing compliance requires DLL# = HIGH (tied to VDDQ via ≤10 kΩ resistor) during normal operation.

What is the purpose of the C and C# output clocks on UPD44165362BF5-E50-EQ3-A?

The C and C# output clocks provide precise, user-controllable timing references for downstream devices: C#↑ latches the first 36-bit data word, and C↑ latches the second. Their 180° phase alignment matches flight time to Q outputs, minimizing skew. If unused, tie both HIGH to revert to K/K#-synchronized output timing.