Renesas IDT71V2559S75PFG

Overview

IDT71V2559S75PFG from Integrated Device Technology is a 3.3V synchronous ZBT™ SRAM with 128K × 36-bit (4.5 Mbit) organization, 7.5 ns clock-to-data access time, and zero bus turnaround architecture. It supports 100 MHz system operation, 4-word burst (linear or interleaved), individual byte write control (BW1–BW4), and flow-through outputs. Used in high-speed packet buffering and network switch fabric memory subsystems.

For engineers reviewing the IDT71V2559S75PFG datasheet, IDT71V2559S75PFG pinout, IDT71V2559S75PFG application, or IDT71V2559S75PFG equivalent, key selection criteria include ZBT™ timing compatibility, 100-pin TQFP mechanical fit, 3.3V core / 2.5V I/O voltage separation, burst counter behavior, and CE1/CE2/CE2 chip enable logic for depth expansion.

Technical Context

The IDT71V2559S75PFG implements a synchronous dual-edge-triggered interface with registered address/control inputs and flow-through data outputs. Its ZBT™ architecture eliminates dead cycles between read and write operations by decoupling address load and data transfer across consecutive clock edges.

It features an on-chip 4-word burst counter controlled by ADV/LD and LBO pins, supporting both linear and interleaved sequences. The device uses three chip enables (CE1, CE2 active-low; CE2 active-high) for hierarchical memory banking, and includes asynchronous OE for output tri-state control independent of clock timing.

Key Specifications

Pinout & Package

Packaged in JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body size, 0.5 mm pitch. Pin 1 marked by dot; top-side marking includes "IDT71V2559S75PFG" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1355KV18 and IS61WV102436B, the IDT71V2559S75PFG uniquely delivers 128K×36 ZBT™ operation with true 3.3V/2.5V rail separation - essential for maintaining signal integrity in mixed-voltage telecom ASIC interfaces while eliminating bus turnaround penalties.

Availability

IDT71V2559S75PFG is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, and radar signal processing applications requiring stable component supply, long-lifecycle support, and industrial temperature compliance.

Supply support for IDT71V2559S75PFG 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 high-performance computing solutions.

The IDT71V2559S75PFG belongs to IDT's ZBT™ SRAM product line, designed specifically for ultra-low-latency, high-throughput memory subsystems in networking, telecommunications, and military/aerospace systems demanding deterministic timing and zero bus turnaround.

FAQ

What is the maximum operating frequency supported by the IDT71V2559S75PFG?

The IDT71V2559S75PFG supports a maximum clock frequency of 100 MHz, corresponding to a 7.5 ns clock-to-data access time. This timing is guaranteed across the full commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature ranges when operated within specified 3.3V ±5% (VDD) and 2.5V ±5% (VDDQ) supply tolerances. System-level timing margins must account for board-level skew and termination.

Does the IDT71V2559S75PFG support both 128K × 36 and 256K × 18 memory configurations?

Yes, the IDT71V2559S75PFG supports both configurations. In 128K × 36 mode, it uses address lines A0–A16 (17 bits) and all 36 I/O bits (I/O0–I/O31 + I/OP1–I/OP4). In 256K × 18 mode, it uses A0–A17 (18 bits) and only I/O0–I/O15 + I/OP1–I/OP2. Configuration is determined by external address mapping and pin strapping - no internal mode register or command sequence is required.

How does the ZBT™ (Zero Bus Turnaround) feature function in the IDT71V2559S75PFG?

The ZBT™ feature in the IDT71V2559S75PFG eliminates idle bus cycles between consecutive read and write operations. When a write cycle completes, the next clock edge can initiate a read without waiting for bus release/reacquisition. This is achieved through internal control logic that manages direction switching and output enable timing autonomously - no external handshake or wait-state insertion is needed.

What is the role of the LBO pin in the IDT71V2559S75PFG?

The LBO (Linear Burst Order) pin selects the 4-word burst sequence: LOW configures linear order (0,1,2,3), HIGH configures interleaved order (0,2,1,3). It is a static input - its state must be stable before burst initiation and cannot change mid-burst. Internally, LBO is pulled to VDD if left unconnected, defaulting to interleaved mode unless actively driven LOW.

Can the IDT71V2559S75PFG operate with OE tied permanently LOW?

Yes, OE can be tied LOW in most applications because the IDT71V2559S75PFG uses synchronous control for data validity - outputs are inherently valid only during read cycles defined by R/W and ADV/LD states. OE is provided for asynchronous override (e.g., bus sharing or power-down sequencing) but is not required for normal read/write operation. Tying OE LOW simplifies design and avoids timing constraints on the OE path.