Renesas 7008L25PFI

Overview

IDT7008L25PFI from Integrated Device Technology (IDT) is a high-speed 64K × 8 true dual-port static RAM with independent left/right ports, 25 ns maximum access time, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous read/write access to the same memory location and supports master/slave arbitration for 16-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the IDT7008L25PFI datasheet, IDT7008L25PFI pinout, IDT7008L25PFI application, or IDT7008L25PFI equivalent, key selection criteria include BUSY/INT flag timing (tBDD ≤ 25 ns, tINS ≤ 20 ns), dual chip-enable power-down modes (ISB3 ≤ 0.2 mA), semaphore arbitration (A0–A2 addressable flags), and 100-pin TQFP package compatibility with PCB layout constraints for dual-bus interconnect.

Technical Context

The IDT7008L25PFI implements fully asynchronous dual-port operation with separate address, data, and control lines per port (A0L–A15L/I/O0L–I/O7L/R/WL/CE0L/CE1L/OEL/SEML/INTL/BUSYL on left; mirrored signals on right). Its on-chip arbitration logic resolves contention via BUSY flag assertion (push-pull, non-tri-state) when address matches occur between ports, with priority determined by tAPS (5 ns setup).

It integrates full hardware semaphore support using eight dedicated flags addressed by A0–A2, accessed only when CE = VIH and SEM = VIL. Interrupt signaling uses fixed mailbox addresses (FFFE_H for INTL, FFFF_H for INTR), with interrupt set/reset controlled by write/read cycles under specific CE/OE/R/W conditions per Truth Table IV.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size ≈ 1.12 in × 1.12 in × 0.16 in, lead pitch 0.5 mm. All VCC pins must be connected to 5 V supply; all GND pins require solid ground plane connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C028V-25AXC and AS7C364B-25JCIN, the IDT7008L25PFI uniquely delivers integrated hardware arbitration (BUSY/INT), master/slave configuration, and industrial temperature operation in a 5 V system-eliminating FPGA logic for contention resolution and enabling drop-in replacement in legacy 5 V designs.

Availability

IDT7008L25PFI is available at Aetrix Electronics and suitable for industrial motion controllers, real-time communication gateways, DSP co-processors, and redundant safety PLC modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for IDT7008L25PFI 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions for communications, computing, and industrial markets.

The IDT7008L25PFI belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems requiring hardware-enforced arbitration and low-latency shared memory access.

FAQ

What is the maximum operating temperature range for the IDT7008L25PFI?

The IDT7008L25PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including access time (25 ns max), standby current (ISB3 ≤ 0.2 mA), and BUSY timing (tBDD ≤ 25 ns), making it suitable for deployment in uncooled industrial enclosures and motor drive cabinets where ambient temperatures exceed commercial-grade limits.

How does the BUSY arbitration logic function in the IDT7008L25PFI?

In the IDT7008L25PFI, BUSY arbitration activates when both ports attempt access to the same memory address. When configured as Master (M/S = VIH), BUSYL and BUSYR assert as push-pull outputs to block conflicting writes. The winning port is determined by tAPS (5 ns arbitration priority setup time); if violated, BUSY assertion is non-deterministic. As Slave (M/S = VIL), BUSY pins become inputs that internally inhibit writes when driven low by a Master device.

Can the IDT7008L25PFI be used in a 3.3 V system?

No-the IDT7008L25PFI requires a 5.0 V ±10% supply (4.5 V to 5.5 V) and is not 3.3 V compatible. Its input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive characteristics (VOH ≥ 2.4 V at –4 mA, VOL ≤ 0.4 V at 4 mA) are specified for TTL-level interfacing. Using it with 3.3 V logic without level translation risks setup/hold violations and unreliable semaphore or interrupt operation.

What are the valid semaphore address ranges for the IDT7008L25PFI?

The IDT7008L25PFI implements eight hardware semaphore flags addressed exclusively by A0–A2 (000₂ to 111₂). These flags are accessed only when CE = VIH and SEM = VIL-distinct from normal RAM access (CE = VIL, SEM = VIH). Writing to I/O0 sets the flag; reading returns the value across all I/O0–I/O7 lines. No other address bits affect semaphore operation, and A3–A15 are ignored during semaphore cycles.

Does the IDT7008L25PFI support depth expansion without external logic?

Yes-the IDT7008L25PFI supports depth expansion via dual chip enables (CE0 and CE1). CE0 selects the memory array; CE1 enables port arbitration and semaphore logic. By tying CE1 of multiple devices together and controlling CE0 individually, designers can cascade units to increase total memory depth while preserving full-speed operation and avoiding discrete decode logic-enabling scalable buffer architectures in programmable logic controllers and test equipment.