Renesas UPD46185182BF1-E40Y-EQ1

Overview

UPD46185182BF1-E40Y-EQ1 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 capability for low-power system states - deployed in high-bandwidth network packet buffers and FPGA co-processor memory subsystems.

For engineers reviewing the UPD46185182BF1-E40Y-EQ1 datasheet, UPD46185182BF1-E40Y-EQ1 pinout, UPD46185182BF1-E40Y-EQ1 application, or UPD46185182BF1-E40Y-EQ1 equivalent, key selection considerations include its −40°C to +85°C industrial temperature rating, user-programmable output impedance (35–70 Ω), dual input/output clock pairs (K/K# and C/C#), and JTAG 1149.1 test access port compliance.

Technical Context

This QDR II SRAM implements a true dual-port architecture with independent read and write data paths, enabling simultaneous transactions without arbitration. Its internal PLL provides a wide output data valid window and supports future frequency scaling up to 300 MHz, while DLL# pin allows PLL bypass during board debug at sub-250 MHz frequencies.

The device uses full-CMOS six-transistor memory cells and integrates synchronous peripheral circuitry including a burst counter, echo clocks (CQ/CQ#), and byte-write control (BW0#/BW1#). All inputs are registered on K and K# rising edges, and outputs are synchronized to C/C# rising edges - delivering precise DDR timing with matched flight time between clock and data.

Key Specifications

Pinout & Package

UPD46185182BF1-E40Y-EQ1 is housed in a 165-pin plastic BGA (13 × 15 mm grid, 0.8 mm pitch), with balls arranged in 13 rows (A–R) and 11 columns (1–11). Pin functions follow JEDEC-standard HSTL signaling and include dedicated echo clocks (CQ/CQ#), dual clock pairs (K/K#, C/C#), and two byte-write controls (BW0#, BW1#) for 9-bit sub-word writes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2663KV18 and IS61QW25618B, UPD46185182BF1-E40Y-EQ1 delivers superior timing control via C/C# output clocks and on-die impedance tuning, making it optimal for new designs demanding maximum signal integrity margin at 250 MHz.

Availability

UPD46185182BF1-E40Y-EQ1 is available at Aetrix Electronics and suitable for network infrastructure, FPGA acceleration, telecom baseband, and industrial control applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UPD46185182BF1-E40Y-EQ1 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 infrastructure markets.

The UPD46185182BF1-E40Y-EQ1 belongs to Renesas' QDR II SRAM product line, engineered for high-throughput, low-latency memory subsystems in networking and real-time processing equipment.

FAQ

What is the guaranteed operating temperature range for UPD46185182BF1-E40Y-EQ1?

The UPD46185182BF1-E40Y-EQ1 is fully specified and tested over −40°C to +85°C ambient temperature. This industrial-grade rating is confirmed in the Ordering Information table (page 2) and DC Characteristics 2 section (page 15) of the datasheet, where IDD and ISB1 current values are explicitly listed for the "-E40Y" suffix variant under TA = −40 to 85°C conditions.

Does UPD46185182BF1-E40Y-EQ1 support true concurrent read and write operations?

Yes, UPD46185182BF1-E40Y-EQ1 implements a true dual-port architecture with physically separate read and write data paths. As stated in the Features section (page 1), it supports "separate independent read and write data ports with concurrent transactions", and the Block Diagram (page 8) shows distinct input registers, write drivers, and output buffers - enabling simultaneous READ and WRITE cycles without arbitration or pipeline stalls.

How is output impedance calibrated on UPD46185182BF1-E40Y-EQ1?

Output impedance is calibrated via the ZQ pin, which connects to an external resistor (175–350 Ω) to ground. As described on page 7, this sets Q, CQ, and CQ# driver impedance to 0.2 × RQ - yielding 35–70 Ω. Calibration occurs automatically every 20 μs after power-up, and the impedance adjusts dynamically for supply voltage and temperature drift, eliminating manual trimming or fixed external termination.

What happens to UPD46185182BF1-E40Y-EQ1 when the input clock stops?

When the K/K# clock stops, UPD46185182BF1-E40Y-EQ1 enters clock-stop mode: outputs go to high-impedance, internal state is preserved, and power consumption drops to standby levels (ISB1 = 420–460 mA at −40 to 85°C). Normal operation resumes within 20 μs after clock restart, as verified in the Features list (page 1) and Truth Table (page 10).

Can UPD46185182BF1-E40Y-EQ1 operate without using the PLL?

Yes - pulling DLL# LOW disables the PLL, allowing operation at frequencies below 250 MHz without PLL lock. However, as noted on page 9 and page 18, AC/DC characteristics are not guaranteed in this mode, and read latency changes from 2 to 1 clock cycle. For full specification compliance, DLL# must be tied HIGH (e.g., to VDDQ via ≤10 kΩ resistor) during normal operation.