Renesas UPD46184184BF1-E40-EQ1-A

Overview

UPD46184184BF1-E40-EQ1-A from Renesas Electronics is a 1,048,576-word × 18-bit synchronous double data rate (DDR II) SRAM with pipelined DDR operation, HSTL interface, and 4-word burst capability. It operates at 250 MHz with 4.0 ns clock cycle time, 1.8 V core supply, and is packaged in a 165-pin plastic BGA (13 × 15 mm) for high-density memory subsystems in networking line cards.

For engineers reviewing the UPD46184184BF1-E40-EQ1-A datasheet, UPD46184184BF1-E40-EQ1-A pinout, UPD46184184BF1-E40-EQ1-A application, or UPD46184184BF1-E40-EQ1-A equivalent, key selection considerations include DDR II timing compliance, HSTL Class I 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 uses full-CMOS six-transistor memory cells and integrates a PLL-based DLL for precise output data valid window control and flight-time matching between C/C# output clocks and DQ data. All inputs-including address (A0, A1), control (LD#, R/W#, BW0#, BW1#), and dual input clocks (K/K#)-are registered on K's rising edge, while data is synchronized to either C/C# (user-tunable) or K/K# (if C/C# fixed HIGH).

The device implements linear 4-word burst addressing with internal address advancement, supports byte-write via BW0#/BW1#, and features echo clocks (CQ/CQ#) tightly matched to DQ outputs for reliable data capture. Its self-timed write control and clock-stop mode enable deterministic low-power operation without external sequencing logic.

Key Specifications

Pinout & Package

UPD46184184BF1-E40-EQ1-A is housed in a 165-pin plastic BGA package with 13 × 15 ball array (1.0 mm pitch), index mark located at corner A1. The package supports thermal dissipation via exposed die pad (not electrically connected) and complies with JEDEC MO-245 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1551KV18 and IS42S16160J, UPD46184184BF1-E40-EQ1-A uniquely combines 250 MHz DDR II performance with user-adjustable output impedance and echo-clock–based timing validation-enabling robust signal integrity in high-speed, mixed-impedance PCB environments without external timing compensation.

Availability

UPD46184184BF1-E40-EQ1-A is available at Aetrix Electronics and suitable for network packet buffering, baseband signal processing, and industrial motion control requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for UPD46184184BF1-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 is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The μPD46184184B family was designed specifically for high-bandwidth, low-latency DDR II memory subsystems in telecom infrastructure and real-time embedded systems demanding deterministic timing and HSTL signal integrity.

FAQ

What is the guaranteed clock frequency and cycle time for UPD46184184BF1-E40-EQ1-A?

The UPD46184184BF1-E40-EQ1-A is rated for 250 MHz operation with a guaranteed maximum clock cycle time of 4.0 ns under commercial temperature conditions (0 °C to +70 °C). This specification is validated per AC Characteristics Table on page 15 of the R10DS0120EJ0200 datasheet and applies to both read and write burst operations using K/K# input clocks.

Does UPD46184184BF1-E40-EQ1-A support clock-stop mode, and how fast does it resume?

Yes, UPD46184184BF1-E40-EQ1-A supports clock-stop mode: when K/K# are halted, the device enters low-power standby while retaining data. Normal operation resumes within 20 μs after clock resumption-no reset or reinitialization sequence is required. This behavior is confirmed in the Power-On Sequence section (page 7) and AC Characteristics table (TKC lock = 20 μs).

How is output impedance calibrated on UPD46184184BF1-E40-EQ1-A?

Output impedance on UPD46184184BF1-E40-EQ1-A is calibrated via the ZQ pin, which connects to an external resistor (RQ) to ground. The device sets DQ, CQ, and CQ# output impedance to 0.2 × RQ, yielding a tunable range of 35–70 Ω. Calibration occurs automatically every 20 μs after power-up and tracks supply/temperature drift, as specified in the Pin Description (page 4) and Electrical Characteristics (page 11).

What JTAG functionality does UPD46184184BF1-E40-EQ1-A provide?

UPD46184184BF1-E40-EQ1-A implements IEEE 1149.1 JTAG with TCK, TMS, TDI, and TDO pins supporting IDCODE (0x00000160), BYPASS, and boundary-scan registers. It lacks TRST but resets the TAP controller on power-up. JTAG DC/AC parameters-including VIH/VIL thresholds and tTHTH = 50 ns min-are fully specified in pages 19–21 of the datasheet.

Can UPD46184184BF1-E40-EQ1-A operate without its PLL enabled?

Yes-asserting DLL# = LOW disables the PLL, allowing operation below 120 MHz for debug or low-frequency validation. However, AC/DC characteristics are not guaranteed in this mode, and read latency changes to 1.0 clock cycle. For production use at 250 MHz, DLL# must be tied HIGH (e.g., via ≤10 kΩ resistor to VDDQ), per Pin Description (page 4) and PLL Constraints (page 7).