Renesas UPD46365364BF1-E40-EQ1-A

Overview

UPD46365364BF1-E40-EQ1-A from Renesas Electronics is a 1,048,576-word × 36-bit synchronous quad data rate (QDR II) SRAM with HSTL interface, 1.8 V core supply, 4.0 ns clock cycle time (250 MHz), and 165-pin plastic BGA (13 × 15) packaging. It supports concurrent read/write ports, four-tick burst operation, and user-programmable output impedance for high-speed networking and packet buffer applications.

For engineers reviewing the UPD46365364BF1-E40-EQ1-A datasheet, UPD46365364BF1-E40-EQ1-A pinout, UPD46365364BF1-E40-EQ1-A application, or UPD46365364BF1-E40-EQ1-A equivalent, key selection considerations include its 36-bit wide I/O, dual-clock timing architecture (K/K# input, C/C# output), DLL-enabled PLL for jitter tolerance, HSTL Class I compliance, and byte-write granularity via BW0#–BW3# control signals.

Technical Context

This QDR II SRAM uses full-CMOS six-transistor memory cells and integrates synchronous peripheral circuitry including a burst counter, internal PLL, and independent read/write data paths. Its dual-clock architecture separates input registration (on K/K# rising edges) from output timing (synchronized to C/C# rising edges), enabling precise flight-time matching between clock and data.

The device implements 4-word burst transfers per transaction, supports clock-stop mode with 20 μs recovery, and provides user-configurable output impedance (35–70 Ω) via ZQ calibration. All control inputs-including R#, W#, and BWx#-are registered on the rising edge of K, and the JTAG 1149.1 test port enables boundary-scan verification.

Key Specifications

Pinout & Package

Package: 165-pin plastic BGA (13 × 15 mm), lead-free, with index mark per JEDEC MO-270AB. Thermal pad not present; bottom-side solder mask defined per datasheet mechanical drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD46365364BF1-E40-EQ1-A, the Cypress part offers higher speed but narrower bus width and incompatible voltage, while the IDT part trades performance and feature set for timing simplicity and broader legacy support.

Availability

UPD46365364BF1-E40-EQ1-A is available at Aetrix Electronics and suitable for high-speed networking, telecom infrastructure, and baseband processing applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for UPD46365364BF1-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 is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and communications markets.

The UPD46365364BF1-E40-EQ1-A belongs to Renesas' QDR II SRAM product line, engineered specifically for high-bandwidth, low-latency buffer applications in network switches, routers, and baseband units where concurrent access and precise timing alignment are critical.

FAQ

What is the maximum guaranteed clock frequency for UPD46365364BF1-E40-EQ1-A?

The UPD46365364BF1-E40-EQ1-A is rated for a 4.0 ns clock cycle time, corresponding to a maximum guaranteed frequency of 250 MHz under specified operating conditions (TA = 0 to 70°C, VDD = 1.8 ± 0.1 V). This rating includes margin for setup/hold timing, jitter, and board-level signal integrity-exceeding 250 MHz may violate AC timing parameters and is not supported.

Does UPD46365364BF1-E40-EQ1-A support true simultaneous read and write operations?

Yes, UPD46365364BF1-E40-EQ1-A supports true concurrent read and write operations through physically separate data ports (Q0–Q35 for read, D0–D35 for write) and independent address latching. The internal state machine allows overlapping transactions as long as R# and W# are not asserted on the same K rising edge-read takes precedence if both are active simultaneously.

How is output impedance calibrated on UPD46365364BF1-E40-EQ1-A?

Output impedance calibration on UPD46365364BF1-E40-EQ1-A is performed via the ZQ pin, which connects to an external resistor (R_Q) to ground. The device measures R_Q at power-up and adjusts Q, CQ, and CQ# driver strength to 0.2 × R_Q, supporting 35–70 Ω range. Calibration repeats every 20 μs to compensate for voltage/temperature drift.

Can UPD46365364BF1-E40-EQ1-A operate without using the C and C# output clocks?

Yes, UPD46365364BF1-E40-EQ1-A can operate with C and C# fixed HIGH, causing output data to be synchronized to K and K# rising edges instead. However, this disables flight-time matching capability and reduces timing margin; the datasheet specifies that C/C# must be fixed HIGH (not floating) to guarantee operation in this mode.

What is the purpose of the DLL# pin on UPD46365364BF1-E40-EQ1-A?

The DLL# pin on UPD46365364BF1-E40-EQ1-A disables the internal PLL when pulled LOW, allowing debug operation at frequencies below 120 MHz without PLL lock requirements. For normal 250 MHz operation, DLL# must be HIGH (typically tied to VDDQ via ≤10 kΩ resistor); leaving it unconnected or floating violates DC specifications and risks undefined behavior.