Renesas UPD46185182BF1-E40Y-EQ1-A

Overview

UPD46185182BF1-E40Y-EQ1-A from Renesas Electronics is a 1,048,576-word × 18-bit synchronous 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) packaging. It supports concurrent read/write ports, burst-2 operation, and clock-stop mode for low-power standby in high-bandwidth networking buffers and packet memory applications.

For engineers reviewing the UPD46185182BF1-E40Y-EQ1-A datasheet, UPD46185182BF1-E40Y-EQ1-A pinout, UPD46185182BF1-E40Y-EQ1-A application, or UPD46185182BF1-E40Y-EQ1-A equivalent, key selection considerations include its −40°C to +85°C industrial temperature rating, user-programmable output impedance (35–70 Ω), JTAG 1149.1 test access, and dual-clock timing architecture using K/K# inputs and C/C# outputs for precise flight-time matching.

Technical Context

This QDR II SRAM implements separate independent read and write data ports with concurrent transaction capability, enabling full 100% bus utilization during DDR READ and WRITE operations. Its internal PLL provides a wide output data valid window and supports future frequency scaling up to 300 MHz.

The device uses two input clocks (K and K#) for precise DDR timing at rising edges only, and two output clocks (C and C#) to deliver clock and data together to the receiving device-ensuring tight skew matching. Internally self-timed write control and clock-stop capability (20 μs recovery) further optimize system-level timing and power management.

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 CY7C2663KV18, UPD46185182BF1-E40Y-EQ1-A offers on-die impedance tuning via ZQ for improved signal integrity across varying board stackups; compared with IDT72V2115L15PF, it provides broader industrial temperature support (−40°C to +85°C vs. 0°C to +70°C) at lower cost, with identical pin compatibility but relaxed AC timing margins.

Availability

UPD46185182BF1-E40Y-EQ1-A is available at Aetrix Electronics and suitable for network packet buffering, high-speed test instrumentation, telecom baseband processing, and real-time video frame storage requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UPD46185182BF1-E40Y-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 manufacturer specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The UPD46185182BF1-E40Y-EQ1-A belongs to Renesas' QDR II SRAM product line, engineered specifically for high-throughput, low-latency memory subsystems in networking, test equipment, and communications infrastructure where concurrent access and precise timing control are critical.

FAQ

What is the maximum operating frequency supported by the UPD46185182BF1-E40Y-EQ1-A?

The UPD46185182BF1-E40Y-EQ1-A is rated for 250 MHz operation with a 4.0 ns clock cycle time. While the datasheet notes PLL support up to 300 MHz (3.3 ns), this speed grade is only guaranteed for the -E33Y variant. The -E40Y suffix explicitly denotes the 250 MHz specification, and operation beyond this violates AC timing guarantees.

Does the UPD46185182BF1-E40Y-EQ1-A support true simultaneous read and write operations?

Yes, the UPD46185182BF1-E40Y-EQ1-A features physically separate read and write data ports with independent address paths, allowing concurrent read and write transactions to different memory locations without arbitration delay. This is confirmed by the block diagram showing dual register banks and the truth table specifying independent R# and W# control.

How does the ZQ pin function on the UPD46185182BF1-E40Y-EQ1-A?

The ZQ pin on the UPD46185182BF1-E40Y-EQ1-A is an input used for output driver impedance calibration. When connected to a precision resistor (typically 240 Ω) to ground, it configures Q, CQ, and CQ# output impedance to 0.2 × RQ (e.g., 48 Ω). Direct connection to VDDQ minimizes impedance; it must never be left floating or tied to VSS.

What is the purpose of the DLL# pin on the UPD46185182BF1-E40Y-EQ1-A?

The DLL# pin disables the internal PLL when pulled LOW, allowing the UPD46185182BF1-E40Y-EQ1-A to operate at frequencies below 120 MHz for board-level debug. During normal operation, DLL# must be pulled HIGH (e.g., via ≤10 kΩ to VDDQ); AC/DC characteristics are not guaranteed in DLL-bypass mode.

Can the UPD46185182BF1-E40Y-EQ1-A be used in systems requiring JTAG boundary-scan testing?

Yes, the UPD46185182BF1-E40Y-EQ1-A integrates a fully compliant IEEE 1149.1 JTAG test access port (TMS, TDI, TCK, TDO) operating at 1.8 V I/O levels. These pins support boundary-scan testing and in-system programming without requiring external level shifters or additional circuitry.