Renesas IDT71P71804S250BQG

Overview

IDT71P71804 from Integrated Device Technology is a 18 Mb (1M × 18-bit) DDR II synchronous SRAM with double-data-rate burst-of-2 operation, 1.8 V core voltage (VDD), 1.5 V I/O supply (VDDQ), and HSTL-compatible 165-ball fBGA package. It delivers two data words per clock cycle via a bidirectional DDR data bus, supports scalable output impedance (35–70 Ω), and integrates dual echo clocks (CQ/CQ) for precise data capture in high-speed networking and packet buffering applications.

For engineers reviewing the IDT71P71804 datasheet, IDT71P71804 pinout, IDT71P71804 application, or IDT71P71804 equivalent, key selection considerations include its 1M×18 organization, burst-of-2 DDR timing, programmable ZQ impedance calibration, DLL-enabled tight CQ–DQ alignment, and compatibility with 1.4–1.9 V I/O voltage scaling for interfacing with 1.8 V systems.

Technical Context

The IDT71P71804 implements a pipelined DDR architecture with separate K/K input clocks for address/control/data capture and C/C clocks for DDR read data output and echo clock generation. Its internal DLL aligns DQ outputs to C/C edges with sub-0.5 ns jitter tolerance, enabling reliable 333 MHz operation (3.0 ns tKHKH).

It features multiplexed address inputs, SA0-controlled burst order reversal for x18 mode, byte-write capability (BW0/BW1), and JTAG support (TCK/TMS/TDI/TDO). The device uses HSTL I/O with independent VREF and VDDQ, allowing interface voltage tuning while maintaining 1.8 V core logic.

Key Specifications

Pinout & Package

Package: 165-ball fBGA (13 mm × 15 mm, 1.0 mm pitch), RoHS-compliant, moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1551KV18 and MT46V16M18, the IDT71P71804 uniquely combines VDDQ voltage scalability, on-die ZQ impedance calibration, and SA0 burst-order control - delivering superior signal integrity adaptability and architectural flexibility for next-generation networking and embedded video systems.

Availability

IDT71P71804 is available at Aetrix Electronics and suitable for packet buffering, switch fabric interface, baseband processing, and industrial video frame store applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for IDT71P71804 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance timing, memory interface, and RF solutions for communications and computing markets.

The IDT71P71804 belongs to IDT's DDR II SRAM product line, designed specifically for high-bandwidth, low-latency data buffering in networking infrastructure, telecom equipment, and real-time embedded systems demanding deterministic timing and scalable I/O voltage operation.

FAQ

What is the maximum operating frequency of the IDT71P71804?

The IDT71P71804 supports a maximum average clock cycle time (tKHKH) of 3.00 ns, corresponding to 333 MHz operation. This enables a sustained 666 MT/s effective data rate on its DDR data bus. Performance is specified across commercial temperature (0 °C to +70 °C) and VDD/VDDQ voltage ranges, with timing parameters validated at 333 MHz, 300 MHz, 250 MHz, 200 MHz, and 167 MHz.

Does the IDT71P71804 support single-clock mode operation?

Yes, the IDT71P71804 supports single-clock mode. When the C and C input clocks are tied high, the K and K clocks assume full timing responsibility - controlling address/control latching, data input sampling, output registration, and echo clock generation. This simplifies system clock distribution in designs where separate C/C routing is impractical.

How does the ZQ pin function in the IDT71P71804?

The ZQ pin on the IDT71P71804 connects to an external resistor (175–350 Ω) to VSS to calibrate output driver impedance. The device sets DQ and CQ output impedance to 0.2 × RQ (e.g., 50 Ω for RQ = 250 Ω) and auto-recalibrates every 1024 clock cycles to compensate for voltage and temperature drift - ensuring consistent signal integrity without manual tuning.

What is the role of the SA0 pin in the IDT71P71804?

In the IDT71P71804 (1M×18 configuration), the SA0 pin controls burst order during read/write operations. When SA0 = 0, the burst sequence is linear (word 0 → word 1); when SA0 = 1, it reverses (word 1 → word 0). This enables flexible data streaming for applications like interleaved I/Q processing without requiring external address manipulation logic.

Is JTAG support available on the IDT71P71804?

Yes, the IDT71P71804 includes full IEEE 1149.1 JTAG boundary scan support via dedicated TCK, TMS, TDI, and TDO pins. This enables automated test pattern generation, interconnect verification, and in-system debugging - critical for validating high-density BGA routing in telecom and networking PCB assemblies.