Renesas IDT71P73804S250BQ

Overview

IDT71P73804 from Integrated Device Technology is a 18Mb (1M × 18-bit) pipelined DDR II SRAM with double-data-rate burst-of-4 operation, HSTL-compatible 1.5V I/O interface, and 1.8V core supply. It delivers 250MHz clock frequency, scalable 35–70Ω output impedance via ZQ calibration, and supports linear burst addressing via SA0/SA1 pins for word-level access in x18 configuration. Used in high-bandwidth packet buffering and network switch data planes.

For engineers reviewing the IDT71P73804 datasheet, IDT71P73804 pinout, IDT71P73804 application, or IDT71P73804 equivalent, key selection criteria include its 1M×18 organization, 165-ball fBGA package, DLL-aligned echo clocks (CQ/CQ), JTAG support, and programmable drive strength for impedance-matched DDR bus design.

Technical Context

The IDT71P73804 implements a synchronous DDR architecture with dual clock domains: K/K for address/control/data capture and C/C for read data/echo clock generation. Its internal DLL tightly aligns DQ outputs to C/C edges, achieving ≤0.5ns output valid/hold windows at 250MHz.

It features multiplexed address inputs, burst-ordered linear addressing (configurable via SA0/SA1), and independent byte-write control (BW0/BW1) enabling selective 9-bit writes per burst word. The device uses separate VDD (1.8V) and VDDQ (1.4–1.9V) supplies, with VREF referenced to VDDQ/2 for HSTL signal integrity.

Key Specifications

Pinout & Package

Package: 165-ball fBGA (13mm × 15mm, 1.0mm pitch), RoHS-compliant, commercial temperature range (0°C to +70°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C2665KV18, IDT71P73804 offers configurable burst start via SA0/SA1 for optimized descriptor handling; compared with MT46V16M18DT-5B, it delivers true SRAM simplicity-no refresh, fixed 4-cycle latency, and DLL-aligned timing for deterministic high-speed capture.

Availability

IDT71P73804 is available at Aetrix Electronics and suitable for network packet buffering, high-speed switch fabric memory, and telecom baseband processing requiring stable component supply and long-term industrial availability.

Supply support for IDT71P73804 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, designs high-performance timing, memory interface, and RF products for communications, computing, and industrial markets.

IDT71P73804 belongs to the QDR™II SRAM family developed jointly by IDT, Cypress, and Micron to deliver high-bandwidth, low-latency synchronous memory for networking and packet-processing systems.

FAQ

What is the memory organization and total capacity of the IDT71P73804?

The IDT71P73804 is organized as 1,048,576 words × 18 bits, delivering a total capacity of 18 megabits (18Mb). This 1M×18 configuration is optimized for applications requiring wide data paths such as network packet descriptors and baseband IQ sample buffering. The IDT71P73804 supports burst-of-4 accesses with linear addressing controlled by SA0 and SA1 pins.

Does the IDT71P73804 support programmable output drive strength, and how is it configured?

Yes, the IDT71P73804 supports programmable output impedance from 35Ω to 70Ω via the ZQ pin. An external resistor (RQ = 175–350Ω) must be connected between ZQ and VSS to set nominal 50Ω drive; connecting ZQ directly to VDDQ forces minimum impedance. This feature eliminates external series termination and adapts to varying PCB trace impedances. The IDT71P73804 recalibrates every 1024 clock cycles to compensate for voltage/temperature drift.

How does the DLL in the IDT71P73804 improve timing performance?

The IDT71P73804 integrates a delay-locked loop (DLL) that aligns DQ output edges precisely with C/C clock edges, achieving ≤0.5ns output valid/hold windows at 250MHz. This eliminates flight-time skew between clock and data at the receiver, enabling reliable source-synchronous capture without strict PCB length matching. The IDT71P73804 allows DLL disable via the Doff pin for simplified timing analysis when ultra-low jitter is not required.

What are the power supply requirements for the IDT71P73804, and why are VDD and VDDQ separate?

The IDT71P73804 requires VDD = 1.7–1.9V for the 1.8V core logic and VDDQ = 1.4–1.9V for the HSTL I/O interface, with VREF = VDDQ/2. Separating VDD and VDDQ isolates core switching noise from sensitive I/O drivers, improves signal integrity, and allows interfacing with mixed-voltage systems (e.g., 1.5V HSTL controllers). The IDT71P73804 draws up to 650mA operating current at 250MHz in x18 mode.

Can the IDT71P73804 operate in single-clock mode, and what pins are repurposed?

Yes, the IDT71P73804 supports single-clock mode by tying C and C high, causing K and K to control both data output timing and echo clock generation. In this mode, DQ outputs align to K/K edges instead of C/C, and CQ/CQ remain active but derived from K/K. This simplifies clock routing in space-constrained designs while retaining burst-of-4 functionality and byte-write capability. The IDT71P73804 maintains full feature support including ZQ calibration and JTAG in single-clock mode.