Renesas UPD46365184BF1-E40-EQ1-A

Overview

UPD46365184BF1-E40-EQ1-A from NEC Electronics (now Renesas) is a 2,097,152-word × 18-bit synchronous quad data rate (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 FPGA co-processor caches.

For engineers reviewing the UPD46365184BF1-E40-EQ1-A datasheet, UPD46365184BF1-E40-EQ1-A pinout, UPD46365184BF1-E40-EQ1-A application, or UPD46365184BF1-E40-EQ1-A equivalent, key selection considerations include its dual-port QDR timing, user-programmable output impedance (35–70 Ω), PLL-enabled output data valid window, clock-stop capability (20 μs recovery), and JTAG 1149.1 test access support.

Technical Context

This QDR II SRAM employs separate independent read and write data ports with concurrent transaction capability, using K/K# input clocks for address/control registration on rising edges and C/C# output clocks to synchronize data delivery with precise flight-time matching. Its internal burst counter and full CMOS six-transistor memory cell enable 100% bus utilization in DDR READ/WRITE operations.

The device integrates a PLL circuit for wide output data valid window and future frequency scaling, supports HSTL Class I I/O standards, and features user-programmable output impedance via ZQ pin calibration. Clock-stop mode suspends operation while retaining state, resuming normal function within 20 μs after clock restart.

Key Specifications

Pinout & Package

Package: 165-pin plastic BGA (13 × 15 mm), lead-free, top-view layout with index mark per package dimensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2665KV18-400BZI and IS45S16160F-400BLI, the UPD46365184BF1-E40-EQ1-A offers optimal balance of 250 MHz performance, 18-bit width, full QDR II feature set (CQ/CQ#, DLL#, ZQ), and proven thermal reliability in commercial temperature range - reducing design risk for mid-speed networking and test equipment.

Availability

UPD46365184BF1-E40-EQ1-A is available at Aetrix Electronics and suitable for network packet buffering, FPGA co-processor cache, and telecom line card memory applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for UPD46365184BF1-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 global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The UPD46365184BF1-E40-EQ1-A belongs to Renesas' QDR II SRAM product line, engineered specifically for high-bandwidth, low-latency memory subsystems in networking, telecommunications, and test equipment where deterministic timing and concurrent access are critical.

FAQ

What is the maximum clock frequency supported by the UPD46365184BF1-E40-EQ1-A?

The UPD46365184BF1-E40-EQ1-A is rated for 250 MHz operation with a 4.0 ns clock cycle time. This specification is validated across the full commercial temperature range (0 °C to +70 °C) and includes timing margins for setup/hold compliance with HSTL I/O standards. Exceeding this frequency may violate AC timing parameters and is not guaranteed.

Does the UPD46365184BF1-E40-EQ1-A support true concurrent read and write operations?

Yes, the UPD46365184BF1-E40-EQ1-A implements fully independent read and write data ports with separate address and control paths. This allows simultaneous initiation and completion of read and write transactions to different memory locations without arbitration delay - a defining feature of QDR II architecture confirmed in the device's block diagram and truth table.

How is output impedance calibrated on the UPD46365184BF1-E40-EQ1-A?

Output impedance calibration on the UPD46365184BF1-E40-EQ1-A is performed via the ZQ pin, which connects to an external resistor to ground. The device measures this resistance at power-up and adjusts Q, CQ, and CQ# driver strength to achieve 0.2 × RQ. Typical RQ values of 175–350 Ω yield calibrated output impedances of 35–70 Ω, as specified in the DC characteristics table.

What is the purpose of the CQ and CQ# pins on the UPD46365184BF1-E40-EQ1-A?

The CQ and CQ# pins on the UPD46365184BF1-E40-EQ1-A are synchronous echo clock outputs tightly matched in flight time to the Q[0:17] data outputs. They provide a hardware-level data-valid indication usable by receiving logic - especially valuable in systems where C/C# cannot be routed alongside data due to skew constraints. CQ/CQ# continue running even when Q outputs are tristated.

Can the UPD46365184BF1-E40-EQ1-A operate without the PLL enabled?

Yes, the UPD46365184BF1-E40-EQ1-A can operate with the PLL disabled by pulling DLL# LOW, allowing use at clock frequencies below 120 MHz for debug or low-power modes. However, AC and DC electrical characteristics are not guaranteed in this mode, and the device must be configured for single-clock operation (C/C# tied HIGH). For production operation, DLL# must be HIGH.