Renesas IDT71P71604S250BQ

Overview

IDT71P71604S250BQ from Integrated Device Technology is a 18 Mb (512K × 36-bit) pipelined DDR-II 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 interfaces. It delivers 333 MHz clock frequency support, dual echo clocks (CQ/CQ), and programmable output impedance (35–70 Ω) for high-speed memory subsystems in network packet buffers and telecom line cards.

For engineers reviewing the IDT71P71604S250BQ datasheet, IDT71P71604S250BQ pinout, IDT71P71604S250BQ application, or IDT71P71604S250BQ equivalent, key selection considerations include burst-of-2 DDR timing alignment, ZQ-controlled output drive strength, SA0-based burst-order control for x36 mode, and 165-ball fBGA package compatibility with high-density PCB layouts.

Technical Context

The IDT71P71604S250BQ implements a synchronous, pipelined architecture with independent K/K and C/C clock domains: K/K latches address/control/data on rising edges, while C/C (or echo clocks CQ/CQ) govern read data output timing via an internal DLL. Its DDR interface transfers two words per clock cycle on a 36-bit bidirectional DQ[35:0] bus, enabling 2.4 Gbps peak bandwidth at 333 MHz.

It supports scalable I/O voltage (1.4–1.9 V VDDQ), HSTL-compliant inputs with VREF reference, and dynamic output impedance tuning via external ZQ resistor (175–350 Ω). The device includes JTAG (TCK/TMS/TDI/TDO), DLL disable (Doff), and burst-order control via SA0 - all confirmed for the 512K × 36 configuration.

Key Specifications

Pinout & Package

Package: 165-ball fBGA (13 mm × 15 mm, 1.0 mm 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-II SRAM applications.

Compared with CY7C1415V25 and MT46V32M36, the IDT71P71604S250BQ uniquely combines HSTL interface compatibility, ZQ-calibrated drive strength, and echo-clock deskew-critical for jitter-sensitive telecom and test equipment designs requiring guaranteed sub-nanosecond timing alignment.

Availability

IDT71P71604S250BQ is available at Aetrix Electronics and suitable for network packet buffers, telecom line cards, high-speed test equipment, and radar signal processing systems requiring stable component supply and long-term obsolescence management.

Supply support for IDT71P71604S250BQ 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 timing, memory interface, RF, and power management ICs for communications and computing infrastructure.

The IDT71P71604S250BQ belongs to IDT's DDR-II SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth memory buffering in carrier-grade networking and high-performance instrumentation.

FAQ

What is the maximum supported clock frequency for IDT71P71604S250BQ?

IDT71P71604S250BQ supports up to 333 MHz average clock cycle time (tKHKH = 3.00 ns min), verified across commercial temperature range (0°C to +70°C) with VDD = 1.8 V ± 100 mV and VDDQ = 1.4–1.9 V. This enables 2.4 Gbps peak data throughput using its burst-of-2 DDR architecture on the 36-bit DQ bus.

How does the ZQ pin function in IDT71P71604S250BQ?

The ZQ pin on IDT71P71604S250BQ connects to an external resistor (175–350 Ω) tied to VSS to calibrate output driver impedance. The device sets DQ output impedance to 0.2 × RQ, yielding 35–70 Ω range. Tying ZQ directly to VDDQ forces minimum 35 Ω mode. Calibration occurs every 1024 clock cycles to compensate for voltage/temperature drift.

Does IDT71P71604S250BQ support burst order reversal, and how is it controlled?

Yes, IDT71P71604S250BQ supports burst order reversal exclusively in x36 mode via the SA0 pin. When SA0 = 0, burst sequence is (a,b); when SA0 = 1, it reverses to (b,a). This feature is documented in the Linear Burst Sequence Table and applies only to x18/x36 variants-not x8/x9-enabling optimized data layout for protocol-specific word ordering.

What are the voltage requirements for VDD, VDDQ, and VREF on IDT71P71604S250BQ?

IDT71P71604S250BQ requires VDD = 1.7–1.9 V (core), VDDQ = 1.4–1.9 V (I/O), and VREF = 0.68–0.95 V (set to VDDQ/2 ± 0.12 V). VDDQ must not exceed VDD during operation. These ranges ensure HSTL compliance, support scalable interface voltages, and maintain valid input thresholds across process/voltage/temperature corners.

Can IDT71P71604S250BQ operate with only one clock pair, and what is the impact?

Yes, IDT71P71604S250BQ supports single-clock mode: tie C and C high to disable them, causing K/K to control both input latching and output timing. In this mode, DQ outputs align to K/K rising edges instead of C/C, and echo clocks CQ/CQ derive from K/K. DLL remains active unless Doff is asserted, preserving timing predictability.