Renesas UPD46365094BF1-E40-EQ1-A

Overview

UPD46365094BF1-E40-EQ1-A from NEC Electronics (now Renesas) is a 4,194,304-word × 9-bit synchronous Quad Data Rate II (QDR-II) SRAM with HSTL interface, 4-word burst operation, and 1.8 V core supply. It delivers 250 MHz clock frequency (4.0 ns cycle time), supports concurrent read/write ports, and is packaged in a 165-pin plastic BGA (13 × 15 mm) for high-density memory subsystems in network packet buffers and baseband processors.

For engineers reviewing the UPD46365094BF1-E40-EQ1-A datasheet, UPD46365094BF1-E40-EQ1-A pinout, UPD46365094BF1-E40-EQ1-A application, or UPD46365094BF1-E40-EQ1-A equivalent, key selection considerations include its 4M × 9 organization, dual-clock (K/K# and C/C#) timing architecture, 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 employs separate independent read and write data ports with concurrent transaction support, enabling simultaneous access without bus contention. Its internal PLL provides wide output data valid window and enables future frequency scaling up to 300 MHz.

The device uses HSTL Class I I/O with VREF-based input thresholding and supports echo clocks (CQ/CQ#) tightly matched to data outputs for precise timing closure. All control and address inputs are registered on the rising edge of K, while data is registered on both K and K# rising edges during writes and synchronized to C/C# rising edges during reads.

Key Specifications

Pinout & Package

UPD46365094BF1-E40-EQ1-A is housed in a 165-pin plastic BGA (13 × 15 mm grid, 0.8 mm pitch), lead-free compliant, with standard top-side index marking. Pin functions are defined per the μPD46365094B-specific pin arrangement (Page 4 of R10DS0090EJ0400 Rev.4.00).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2665KV18-400BZI and AS7C331024B-20BIN, UPD46365094BF1-E40-EQ1-A uniquely balances 9-bit width, 250 MHz QDR-II performance, and BGA packaging for space-constrained telecom and test equipment, offering optimal trade-off between density, speed, and interface compatibility.

Availability

UPD46365094BF1-E40-EQ1-A is available at Aetrix Electronics and suitable for network packet buffering, baseband processor memory, and switch fabric lookup tables requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for UPD46365094BF1-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 Corporation (formerly NEC Electronics) is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and communications markets.

The μPD46365xxx series was designed specifically for high-bandwidth, low-latency memory subsystems in networking infrastructure and wireless base stations, emphasizing QDR-II protocol compliance, HSTL signal integrity, and robust thermal performance in compact BGA packages.

FAQ

What is the memory organization and total capacity of UPD46365094BF1-E40-EQ1-A?

UPD46365094BF1-E40-EQ1-A is organized as 4,194,304 words × 9 bits, delivering a total capacity of 36 megabits (36 Mbit). This configuration supports applications requiring a 9-bit data path-such as 8-bit data plus parity-or flexible byte-aligned access in packet-processing systems. The device implements true QDR-II architecture with separate read and write ports.

Does UPD46365094BF1-E40-EQ1-A support concurrent read and write operations?

Yes, UPD46365094BF1-E40-EQ1-A supports true concurrent read and write operations via physically independent read and write data ports. This allows simultaneous access to the memory array without bus contention-essential for real-time applications like network packet buffering where ingress and egress data streams must be handled in parallel without latency penalties.

What are the clocking requirements for UPD46365094BF1-E40-EQ1-A?

UPD46365094BF1-E40-EQ1-A requires two differential clock pairs: K/K# for input registration (address, control, write data) and C/C# for output timing (read data, echo clocks). K/K# must be 180° out-of-phase; C/C# may be tied HIGH to use K/K# for output timing. The device operates at 250 MHz (4.0 ns cycle time) and supports clock-stop with 20 μs recovery.

How is output impedance controlled on UPD46365094BF1-E40-EQ1-A?

UPD46365094BF1-E40-EQ1-A provides user-programmable output impedance via the ZQ pin, which connects to an external resistor to ground. This adjusts Q, CQ, and CQ# driver impedance to 35–70 Ω, matching typical PCB trace impedances. Calibration occurs automatically every 20 μs after power-up and tracks supply/temperature drift-eliminating need for fixed external termination resistors.

Is UPD46365094BF1-E40-EQ1-A compatible with JTAG boundary-scan testing?

Yes, UPD46365094BF1-E40-EQ1-A integrates a fully compliant IEEE 1149.1 JTAG test access port (TMS, TDI, TCK, TDO) operating at 1.8 V I/O level. This enables boundary-scan testing for interconnect verification and in-system debugging. Pins may be left unconnected if JTAG functionality is unused, except TCK which must be tied to VSS in that case.