Renesas UPD46365182BF1-E40-EQ1-A

Overview

UPD46365182BF1-E40-EQ1-A from Renesas Electronics is a 2,097,152-word × 18-bit synchronous quad data rate (QDR II) SRAM with 4.0 ns clock cycle time (250 MHz), 1.8 V core supply, HSTL interface, and 165-pin plastic BGA (13 × 15) package. It supports concurrent read/write operations, burst-2 DDR transactions, and is used in high-speed networking buffers and packet-forwarding engines.

For engineers reviewing the UPD46365182BF1-E40-EQ1-A datasheet, UPD46365182BF1-E40-EQ1-A pinout, UPD46365182BF1-E40-EQ1-A application, or UPD46365182BF1-E40-EQ1-A equivalent, key selection considerations include its 2M × 18 organization, 250 MHz QDR-II timing, dual-clock (K/K# and C/C#) architecture, HSTL I/O compliance, and user-programmable output impedance (35–70 Ω).

Technical Context

This QDR II SRAM employs separate read and write data ports with independent address latching on K (read) and K# (write) rising edges. Its internal PLL enables wide output data valid window and supports future frequency scaling up to 300 MHz.

The device delivers synchronized output data aligned to C/C# rising edges (or K/K# if C/C# are tied HIGH), includes echo clocks (CQ/CQ#) tightly matched to data for precise timing validation, and features JTAG 1149.1 test access for boundary-scan verification.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2665KV18-400BZI, UPD46365182BF1-E40-EQ1-A offers lower power at 250 MHz and broader VDDQ tolerance, while IS42S16160F-6BL lacks true QDR architecture and cannot support simultaneous access-making UPD46365182BF1-E40-EQ1-A the optimal choice for deterministic, high-throughput buffering.

Availability

UPD46365182BF1-E40-EQ1-A is available at Aetrix Electronics and suitable for high-speed networking equipment, telecom infrastructure, and storage controller designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for UPD46365182BF1-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 is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and communications markets.

The UPD46365182BF1-E40-EQ1-A belongs to Renesas' QDR II SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth buffering in packet-switched networks and real-time data path applications.

FAQ

What is the maximum operating frequency supported by UPD46365182BF1-E40-EQ1-A?

The UPD46365182BF1-E40-EQ1-A is rated for 250 MHz operation with a 4.0 ns clock cycle time. While its QDR II architecture supports up to 300 MHz (3.3 ns) in the -E33 variant, the -E40 suffix confirms this specific part is characterized and guaranteed for 250 MHz across 0°C to 70°C ambient temperature.

Does UPD46365182BF1-E40-EQ1-A support concurrent read and write operations?

Yes, UPD46365182BF1-E40-EQ1-A features fully independent read and write data ports. It can execute a READ transaction on one port while simultaneously performing a WRITE on the other, enabling true full-duplex memory access essential for switch fabric and packet buffer applications.

How is output impedance calibrated on UPD46365182BF1-E40-EQ1-A?

Output impedance calibration on UPD46365182BF1-E40-EQ1-A is performed via the ZQ pin. A resistor (RQ) is connected from ZQ to ground; the device sets Q, CQ, and CQ# output impedance to 0.2 × RQ. The calibration runs automatically every 20 μs after power-up to compensate for voltage and temperature drift.

What happens when DLL# is pulled LOW on UPD46365182BF1-E40-EQ1-A?

When DLL# is pulled LOW, the internal PLL is disabled, allowing operation at clock frequencies below 120 MHz. However, AC/DC electrical characteristics are not guaranteed, and read latency changes from 2.0 to 1.0 clock cycles. This mode is intended solely for board-level debug-not production use.

Can UPD46365182BF1-E40-EQ1-A be used with a single-ended clock source?

No-UPD46365182BF1-E40-EQ1-A requires differential clock pairs: K/K# for input registration and C/C# for output timing. Single-ended drive violates setup/hold timing and may cause metastability. The device expects 180° phase alignment between each pair, with strict jitter limits (TKC var ≤ 0.2 ns).