Renesas UPD46184362BF1-E40-EQ1-A

Overview

UPD46184362BF1-E40-EQ1-A from NEC Electronics (now Renesas) is a 524,288-word × 36-bit synchronous double data rate static RAM with pipelined DDR operation, HSTL interface, and 1.8 V core supply. It delivers 250 MHz clock frequency (4.0 ns cycle time), supports two-word burst reads/writes, and integrates PLL-based timing control for precise output data valid windows. It is used in high-speed networking buffers and FPGA co-processor memory subsystems requiring low-latency, wide-data-width synchronous storage.

For engineers reviewing the UPD46184362BF1-E40-EQ1-A datasheet, UPD46184362BF1-E40-EQ1-A pinout, UPD46184362BF1-E40-EQ1-A application, or UPD46184362BF1-E40-EQ1-A equivalent, key selection considerations include its 165-pin plastic BGA (13 × 15) package, HSTL I/O compatibility, user-programmable output impedance (35–70 Ω), clock-stop capability (20 μs recovery), and JTAG 1149.1 test access support.

Technical Context

This DDR II SRAM employs full-CMOS six-transistor memory cells and synchronous peripheral circuitry including a burst counter and DLL/PLL for jitter-tolerant timing. All inputs-address, R/W#, LD#, BWx#, K/K#-are registered on the rising edge of K, while data outputs are synchronized to C/C# rising edges for flight-time matching.

The device implements linear two-tick burst addressing with A0 selecting the starting address within the burst, and uses separate input (K/K#) and output (C/C#) clock pairs to decouple write capture and read delivery timing. Echo clocks CQ/CQ# provide tightly matched data-valid indicators with ±0.1 ns variation relative to DQ outputs.

Key Specifications

Pinout & Package

UPD46184362BF1-E40-EQ1-A is housed in a 165-pin plastic BGA (13 × 15 mm) with ball pitch of 0.8 mm. Pin functions are defined per top-view layout in datasheet pages 4 and 5, with dedicated address, data, clock, control, power, and test terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD46184362BF1-E40-EQ1-A, CY7C1551KV18-400BZI offers higher bandwidth but demands stricter board-level timing closure, while AS7C331024A-15JIN trades DDR performance for simplicity and voltage flexibility-neither is pin-compatible, and both require controller firmware and layout revisions.

Availability

UPD46184362BF1-E40-EQ1-A is available at Aetrix Electronics and suitable for high-speed networking buffers, FPGA-based video frame stores, and industrial motion control look-up tables requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for UPD46184362BF1-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 manufacturer specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The μPD46184362B family was designed specifically for high-bandwidth, low-latency synchronous memory applications in FPGA- and ASIC-based systems where DDR timing predictability, HSTL compatibility, and burst efficiency are critical.

FAQ

What is the maximum supported clock frequency for UPD46184362BF1-E40-EQ1-A?

The UPD46184362BF1-E40-EQ1-A is rated for 250 MHz operation with a 4.0 ns clock cycle time. This is specified in the Ordering Information table (page 2) and confirmed in AC Characteristics (page 17). Operation above 250 MHz violates the -E40 speed grade and may result in timing violations or data corruption. The -E33 variant supports 300 MHz, but UPD46184362BF1-E40-EQ1-A must not exceed 250 MHz.

Does UPD46184362BF1-E40-EQ1-A support clock stopping, and how quickly does it resume operation?

Yes, UPD46184362BF1-E40-EQ1-A supports clock-stop mode. When K/K# are halted, the device enters a low-power state while retaining memory contents. Normal operation resumes within 20 μs after clock restart, as verified in the Power-On Sequence section (page 8) and AC Characteristics table (page 17, TKC lock = 20 μs). No reinitialization or NOP cycles are required beyond this lock time.

How is output impedance calibrated on UPD46184362BF1-E40-EQ1-A?

Output impedance is calibrated via the ZQ pin, which connects to an external resistor (RQ) tied to ground. The device sets DQ, CQ, and CQ# output impedance to 0.2 × RQ, yielding 35–70 Ω for RQ = 175–350 Ω. Calibration occurs automatically every 20 μs after power-up (page 6). Direct connection of ZQ to VDDQ minimizes impedance; grounding or leaving ZQ floating is prohibited.

What is the function of CQ and CQ# pins on UPD46184362BF1-E40-EQ1-A?

CQ and CQ# are synchronous echo clock outputs that rise in tight alignment with DQ data valid windows-within ±0.1 ns per datasheet (page 18, Note 6). They provide a system-level data-valid indication independent of C/C# timing, enabling robust capture in high-speed receivers. Unlike C/C#, CQ/CQ# continue running even when DQ tristates (page 6).

Can UPD46184362BF1-E40-EQ1-A operate without the internal PLL enabled?

Yes, UPD46184362BF1-E40-EQ1-A can operate with the PLL disabled by asserting DLL# = LOW. In this mode, read latency reduces to 1.0 clock cycle, but AC/DC electrical characteristics are not guaranteed (page 8, page 17, Note 1). For production use, DLL# must be held HIGH (e.g., tied to VDDQ via ≤10 kΩ resistor) to ensure full specification compliance.