IDT71P71604S167BQG

Memory IC Overview

The IDT71P71604S167BQG is an 18Mb DDR II SRAM with a 512K x 36 organization. It features a common read/write data port and dual echo clock outputs. The device supports a two-word burst on all accesses using a multiplexed address bus, allowing one request per clock cycle. It utilizes a double-data-rate data bus for two word bursts per clock. The interface uses HSTL inputs scalable from 1.4V to 1.9V. Output drivers are scalable with adjustable impedance from 35 ohms to 70 ohms. It operates on a 1.8V core voltage and is housed in a 165-ball fBGA package.

Memory IC Feature Summary

• Supports double-data-rate bidirectional data port maximizing bandwidth by passing two data items per clock cycle.
• Features programmable output impedance allowing adjustment of drive strength to adapt to various loads and transmission lines.
• Includes dual echo clock outputs tightly aligned with synchronous data outputs for valid indication.
• Utilizes HSTL interfaces that can be scaled to higher voltages up to 1.9V for system interfacing.

Memory IC Applications

• High-speed networking equipment
• Telecommunications systems
• Data acquisition systems

Memory IC Procurement Notes

Verify the specific speed grade suffix matches the required clock frequency, as the datasheet covers multiple variants (e.g., 167MHz). Confirm the package type corresponds to the 165-ball fBGA configuration. Ensure the operating temperature range requirements align with the commercial specifications provided in the documentation.

Memory IC Selection Notes

Select this component when high-bandwidth memory access is required with low latency. The common data port simplifies board layout compared to separate ports. Consider the scalability of the I/O voltage and impedance for compatibility with existing system buses. Verify that the controller supports the specific DDR II Burst of Two protocol.

Memory IC Part Context

This part belongs to the IDT71P71 family of 18Mb DDR II SRAMs. Other members include the 2Mx8, 2Mx9, and 1Mx18 configurations. All share the same 165-ball fBGA package and core architecture but differ in data width and address depth. The family enables depth expansion through control logic.

Memory IC Replacement Considerations

Check for direct pin-compatible substitutes within the IDT71P71 series if different speeds or widths are needed. Verify that any replacement maintains the 165-ball fBGA footprint and compatible voltage levels.

Memory IC FAQ

How is the output impedance adjusted?

An external resistor RQ connected between the ZQ pin and Vss sets the impedance. The value must be 5 times the intended drive impedance, typically ranging from 175 to 350 ohms.

What is the function of the SA0 input?

SA0 allows addressing individual words within a burst on x18 and x36 devices. It can reverse the burst order or select specific word positions during read/write operations.