Renesas UPD46364185BF1-E33-EQ1-A

Overview

UPD46364185BF1-E33-EQ1-A from NEC Electronics (now Renesas) is a 2,097,152-word × 18-bit synchronous DDR II SRAM with HSTL interface, 300 MHz operation (3.3 ns cycle time), 1.8 V core supply, and 165-pin plastic BGA (13 × 15 mm) packaging. It delivers pipelined double data rate reads/writes per clock cycle and supports burst-2 transactions for high-bandwidth buffering in network packet processors.

For engineers reviewing the UPD46364185BF1-E33-EQ1-A datasheet, UPD46364185BF1-E33-EQ1-A pinout, UPD46364185BF1-E33-EQ1-A application, or UPD46364185BF1-E33-EQ1-A equivalent, key selection considerations include its dual-clock timing architecture (K/K# input + C/C# output clocks), user-programmable output impedance (35–70 Ω), echo clock (CQ/CQ#) for precise data valid window alignment, and JTAG 1149.1 test port support.

Technical Context

This device implements a fully synchronous DDR II SRAM architecture with separate read/write data ports, internal burst counter, and PLL-based clock generation for stable high-frequency operation. All address, control, and data inputs are registered on rising edges of K and K#, while outputs are synchronized to C/C# or optionally to K/K# when C/C# are held high.

The memory integrates HSTL Class I I/O buffers, DLL-controlled output timing, and ZQ calibration for dynamic output impedance matching. Its two-tick burst mode enables low-latency, deterministic 2-word transfers per cycle - critical for real-time packet buffering where predictable access timing supersedes maximum density.

Key Specifications

Pinout & Package

165-pin plastic BGA (13 × 15 mm, 0.8 mm pitch), top view; package meets JEDEC MO-245 standards with index mark at corner A1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous DDR SRAM applications.

Compared with CY7C1305KV18-333BZXI and IS42S16100F-3BL, the UPD46364185BF1-E33-EQ1-A offers deterministic sub-ns timing via echo clocks, 1.8 V HSTL compatibility, and on-die impedance tuning - making it uniquely suited for latency-critical, high-reliability packet and video buffering where signal integrity and timing predictability are non-negotiable.

Availability

UPD46364185BF1-E33-EQ1-A is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, and high-speed test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for UPD46364185BF1-E33-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 communications markets.

The UPD46364185BF1-E33-EQ1-A belongs to Renesas' DDR II SRAM product line, engineered specifically for deterministic, high-bandwidth buffering in networking and telecom infrastructure where sub-cycle latency, signal integrity, and thermal reliability are critical.

FAQ

What is the exact memory organization and density of the UPD46364185BF1-E33-EQ1-A?

The UPD46364185BF1-E33-EQ1-A is organized as 2,097,152 words × 18 bits, delivering a total capacity of 36 Mbit. This configuration supports 18-bit-wide data paths with 2M-depth addressing - optimized for applications like packet buffering where balanced width and depth simplify controller logic and reduce external bus width.

Does the UPD46364185BF1-E33-EQ1-A require an external PLL or clock synthesizer?

No, the UPD46364185BF1-E33-EQ1-A integrates an on-die PLL for output timing generation. It locks to the K input clock within 20 μs and uses that reference to drive C/C# and CQ/CQ# outputs. An external PLL is unnecessary unless system-level clock distribution demands additional fanout or jitter cleaning beyond the device's built-in capability.

How does the ZQ pin function on the UPD46364185BF1-E33-EQ1-A, and what resistor value should be used?

The ZQ pin on the UPD46364185BF1-E33-EQ1-A connects to an external resistor to ground for output impedance calibration. Using a 240 Ω resistor yields nominal 48 Ω output impedance (0.2 × 240 Ω), matching standard 50 Ω PCB traces. The device auto-calibrates every 20 μs after power-up and tracks voltage/temperature drift - eliminating manual trimming or fixed termination networks.

Can the UPD46364185BF1-E33-EQ1-A operate without the C and C# output clocks?

Yes - the UPD46364185BF1-E33-EQ1-A can operate with C and C# tied HIGH, causing Q outputs to be synchronized directly to K and K# rising edges instead. However, this forfeits the flight-time compensation and skew-matching benefits of the dedicated output clock pair, reducing timing margin in high-speed or long-trace applications.

What is the purpose of the DLL# pin on the UPD46364185BF1-E33-EQ1-A, and how should it be configured?

The DLL# pin disables the internal PLL when pulled LOW, allowing low-frequency debugging (below 120 MHz) without PLL lock requirements. For normal operation at 300 MHz, DLL# must be HIGH - typically tied to VDDQ via a ≤10 kΩ resistor. Leaving DLL# floating or connecting it to GND violates specifications and risks undefined behavior.