Renesas 7008S20PFI

Overview

IDT7008S20PFI from Integrated Device Technology (IDT) is a high-speed 64K × 8 true dual-ported static RAM with independent left/right ports, 20 ns maximum access time, TTL-compatible 5V ±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 arbitration for 16-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7008S20PFI datasheet, 7008S20PFI pinout, 7008S20PFI application, or 7008S20PFI equivalent, key selection criteria include BUSY/INT arbitration timing (tBDD ≤ 20 ns), dual CE0/CE1-controlled power-down modes (ISB3 ≤ 0.2 mA), semaphore flag support via A0–A2, and compatibility with 84-pin PLCC packaging for legacy industrial PCB layouts.

Technical Context

The 7008S20PFI implements fully asynchronous dual-port operation with separate address, data, and control buses per port (A0L–A15L/I/O0L–I/O7L/R/WL/CE0L/CE1L/OEL/SEML/INTL/BUSYL and mirrored right-side signals). Its on-chip arbitration logic resolves port contention using either address-match detection (tAPS = 5 ns) or CE-controlled timing, with push-pull BUSY outputs (not tri-state) that inhibit writes when asserted.

It integrates full hardware semaphore signaling across eight flags addressed by A0–A2, accessible only when CE = VIH and SEM = VIL, and supports interrupt generation via dedicated mailbox addresses (FFFE_H for INTL, FFFF_H for INTR), with tINS/tINR ≤ 20 ns. Power management includes four standby current modes (ISB1–ISB4) dependent on CE level and input logic family (TTL vs. CMOS).

Key Specifications

Pinout & Package

7008S20PFI is packaged in an 84-pin Plastic Leadless Chip Carrier (PLCC) with 0.050" lead pitch. Pin 1 is marked by a notch; top view orientation follows JEDEC MS-018 standard. All VCC and GND pins must be connected per datasheet Note 1 and Note 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and IDT70V27L25PF, the 7008S20PFI uniquely delivers 5V-tolerant dual-port operation with integrated BUSY/SEM/INT logic in an 84-pin PLCC-enabling drop-in replacement in industrial control systems where pin-for-pin compatibility and hardware arbitration are mandatory.

Availability

7008S20PFI is available at Aetrix Electronics and suitable for industrial PLC controllers, avionics data recorders, and medical imaging subsystems requiring stable component supply, long-lifecycle support, and RoHS-compliant green packaging.

Supply support for 7008S20PFI 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 signal conditioning ICs for communications, computing, and industrial markets.

The IDT7008 product line was designed specifically for real-time multi-processor systems requiring deterministic shared memory access without software overhead-targeting industrial automation, aerospace, and medical equipment where hardware arbitration and 5V robustness are critical.

FAQ

What is the maximum operating temperature range for the 7008S20PFI?

The 7008S20PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including access time (20 ns max), standby current (ISB3 ≤ 0.2 mA), and BUSY arbitration timing (tBDD ≤ 20 ns), with no derating required within this range. The 7008S20PFI achieves this using IDT's proprietary CMOS process optimized for thermal stability under continuous 5V bias.

How does the M/S pin affect BUSY signal behavior in the 7008S20PFI?

When M/S = VIH, the 7008S20PFI operates as a Master: BUSYL and BUSYR become push-pull outputs that assert LOW to block writes during port contention. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that must be driven LOW by an external Master to inhibit writes. This dual-mode capability allows flexible system-level arbitration topologies without redesigning the 7008S20PFI's internal logic.

Can the 7008S20PFI support simultaneous read operations from both ports to the same memory address?

Yes, the 7008S20PFI's true dual-port SRAM cells allow concurrent reads from both left and right ports to identical addresses with no timing penalty or data corruption. This is inherent to its cell architecture-not dependent on BUSY arbitration-and is guaranteed across all operating conditions. Simultaneous reads do not trigger BUSY assertion, and output validity is determined solely by tAA (≤20 ns) and tAOE (≤12 ns) specifications for each port independently.

What are the power consumption characteristics of the 7008S20PFI in standby mode?

The 7008S20PFI offers four standby current modes: ISB1 (both ports TTL-inactive, 65 mA typ.), ISB2 (one port active, 115 mA typ.), ISB3 (full CMOS standby, 0.2 mA typ.), and ISB4 (one port CMOS-standby, 110 mA typ.). ISB3 is the lowest-power state, achieved when both CE0/CE1 inputs exceed VCC − 0.2 V and all control inputs are held at valid CMOS levels-making it ideal for battery-backed industrial systems where <1 mA quiescent draw is mandatory.

How are interrupt flags generated and cleared in the 7008S20PFI?

Interrupt flags in the 7008S20PFI are hardware-generated: writing to address FFFF_H via the left port asserts INTR; writing to FFFE_H via the right port asserts INTL. Clearing requires reading FFFF_H (for INTR) or FFFE_H (for INTL) with appropriate CE/OE enables. Timing is guaranteed at tINS/tINR ≤ 20 ns. These mailbox addresses remain functional as general SRAM if interrupts are unused-no configuration register programming is required to enable this feature in the 7008S20PFI.