Renesas 7008S25PFI

Overview

IDT7008S25PFI from Integrated Device Technology (IDT) is a high-speed 64K × 8 true dual-ported 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 asynchronous reads/writes to the same memory location and supports master/slave cascading for 16-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the IDT7008S25PFI datasheet, IDT7008S25PFI pinout, IDT7008S25PFI application, or IDT7008S25PFI equivalent, key selection considerations include BUSY arbitration timing (tBDD ≤ 25 ns), semaphore flag support (8 flags via A0–A2), dual chip-enable depth expansion, and compatibility with 100-pin TQFP layout constraints.

Technical Context

The IDT7008S25PFI implements fully asynchronous dual-port operation with separate address, data, and control buses per port (A0L–A15L/I/O0L–I/O7L/CE0L/R/WL/OEL/SEML/INTL/BUSYL and mirrored right-side signals). Its on-chip arbitration logic resolves contention via push-pull BUSY outputs (not tri-state) and supports both address-match and CE-controlled BUSY assertion modes.

It integrates full hardware semaphore signaling across eight flags addressed by A0–A2, with write-to-I/O0 and read-from-all-I/Os behavior. Interrupt functionality uses dedicated mailbox addresses FFFE_H (left INTL set/clear) and FFFF_H (right INTR set/clear), requiring no external logic for inter-processor communication.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size ≈ 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant green variant available.

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 IDT7008S25PFI uniquely delivers 5 V native operation, true dual-port concurrency, and integrated hardware arbitration-making it irreplaceable in deterministic real-time systems requiring sub-25 ns memory coherency.

Availability

IDT7008S25PFI is available at Aetrix Electronics and suitable for industrial motion control, telecom line card buffering, and medical imaging data acquisition requiring stable component supply across extended product lifecycles.

Supply support for IDT7008S25PFI 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

The IDT7008S25PFI belongs to IDT's high-speed dual-port SRAM product line, designed specifically for real-time embedded systems requiring deterministic inter-processor communication, hardware-accelerated resource arbitration, and industrial-grade reliability.

FAQ

What is the operating temperature range for the IDT7008S25PFI?

The IDT7008S25PFI is rated for industrial temperature operation from –40°C to +85°C, validated across the full voltage range (4.5 V to 5.5 V) and all AC timing parameters. This qualification makes it suitable for deployment in harsh environments such as factory automation controllers, outdoor telecom base stations, and vehicle-mounted diagnostic equipment where ambient thermal cycling is expected.

Does the IDT7008S25PFI support true simultaneous read operations from both ports?

Yes, the IDT7008S25PFI implements true dual-ported memory cells that allow concurrent reads from identical or different addresses on the left and right ports without contention or delay. This capability is inherent to the silicon cell design-not dependent on external arbitration-and enables lock-free data exchange between independent processors or DMA channels accessing shared memory regions.

How does the BUSY arbitration logic function in the IDT7008S25PFI when configured as a MASTER?

When M/S = VIH (MASTER mode), BUSYL and BUSYR are push-pull outputs that assert LOW to block writes on the opposing port during address contention. The IDT7008S25PFI uses either address-match detection (tBAA ≤ 20 ns) or CE-controlled timing (tBAC ≤ 20 ns) to trigger BUSY, with tBDD ≤ 25 ns defining the guaranteed delay from BUSY deassertion to valid read data-ensuring deterministic resolution of port-to-port conflicts.

Can the IDT7008S25PFI be used in a 16-bit data bus configuration?

Yes, the IDT7008S25PFI supports 16-bit expansion via MASTER/SLAVE cascading using the M/S pin. Two devices can be interconnected so that one operates as MASTER (M/S = VIH) and the other as SLAVE (M/S = VIL), enabling full-speed 16-bit word access without external logic. The BUSY and semaphore signals coordinate arbitration across both devices, preserving timing integrity and eliminating wait states.

What are the power consumption characteristics of the IDT7008S25PFI in standby mode?

In full standby (ISB3 mode), where both CE0 and CE1 are held at CMOS-inactive levels (> VCC − 0.2 V) and all inputs are static, the IDT7008S25PFI draws just 0.2 mA typical current. This ultra-low quiescent power enables use in battery-backed systems such as portable medical monitors or remote sensor gateways where multi-year operation without maintenance is required.