Renesas 70V24S55PF8

Overview

IDT70V24S55PF8 from Integrated Device Technology is a high-speed 4K x 16 dual-port static RAM with true asynchronous dual-port architecture, 55 ns maximum read cycle time (commercial grade), 3.3 V single-supply operation, and integrated semaphore logic for inter-processor communication - used in real-time embedded systems requiring concurrent memory access by two independent controllers.

For engineers reviewing the IDT70V24S55PF8 datasheet, IDT70V24S55PF8 pinout, IDT70V24S55PF8 application, or IDT70V24S55PF8 equivalent, this page delivers verified electrical specs, validated PLCC-84 pin mapping, industrial-grade timing behavior, and direct alternatives for bus-width expansion or power-optimized replacement in legacy dual-ported memory designs.

Technical Context

This device implements fully independent left/right ports with separate address, data, and control lines (CEL/CER, R/WL/R/WR, OEL/OER, UBL/UBR, LBL/LBR), enabling simultaneous read/write to the same memory location without arbitration delay. On-chip hardware semaphore logic (A0–A2 addressed, eight flags) supports atomic resource locking between ports.

It operates at 3.3 V ±0.3 V with TTL-compatible inputs and push-pull BUSY/INT outputs; features automatic power-down via chip enable; and uses CMOS process technology to achieve 400 mW typical active power and 660 µW typical standby power - optimized for deterministic latency in real-time control subsystems.

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLG84), body size ≈ 1.15 in × 1.15 in × 0.17 in, lead pitch 0.05 in. All VDD pins require connection to 3.3 V supply; all VSS pins must be grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V24S55PF8, CY7C024AV-55AXC requires board-level voltage rail changes and offers wider temp range, while IDT70V24L15PF8 delivers faster access but invalidates existing timing budgets - neither is pin- or timing-compatible, making IDT70V24S55PF8 irreplaceable in legacy 55 ns-constrained deployments.

Availability

IDT70V24S55PF8 is available at Aetrix Electronics and suitable for industrial motion controllers, avionics data acquisition units, and medical imaging front-ends requiring stable component supply, long-lifecycle support, and verified PLCC-84 packaging.

Supply support for IDT70V24S55PF8 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.

IDT70V24S55PF8 belongs to the IDT70V24 family of dual-port SRAMs designed specifically for real-time, deterministic inter-processor communication in embedded control systems where concurrent memory access and hardware semaphore coherency are critical.

FAQ

What is the maximum operating frequency supported by IDT70V24S55PF8?

IDT70V24S55PF8 has a 55 ns maximum read cycle time (tRC), corresponding to a theoretical maximum operating frequency of ~18.2 MHz for consecutive reads. This assumes full address/control setup/hold compliance and applies only under commercial temperature conditions (0°C to +70°C); actual system clock rate depends on bus controller timing margins and layout-induced skew.

Does IDT70V24S55PF8 support true simultaneous read/write to the same memory address?

Yes, IDT70V24S55PF8 implements true dual-port SRAM cells that allow simultaneous read from one port and write to the same address on the other port - confirmed in the Functional Block Diagram and Truth Table I. No arbitration logic is needed, and data integrity is maintained without external intervention.

What is the function of the M/S pin on IDT70V24S55PF8?

The M/S (Master/Slave) pin configures BUSY behavior: when driven high (VIH), BUSY becomes an output flag indicating port contention (Master mode); when driven low (VIL), BUSY becomes an input for cascaded slave devices (Slave mode). This enables seamless expansion to 32-bit+ data widths using multiple IDT70V24S55PF8 devices.

Can IDT70V24S55PF8 operate with mixed 3.3 V and 5 V logic interfaces?

No - IDT70V24S55PF8 is strictly LVTTL-compatible with 3.3 V ±0.3 V supply and input thresholds defined for 3.3 V systems (VIH = 2.0 V min, VIL = 0.8 V max). Direct connection to 5 V logic violates absolute maximum ratings and risks permanent damage; level translation is mandatory for 5 V interface integration.

How many hardware semaphore flags does IDT70V24S55PF8 provide, and how are they accessed?

IDT70V24S55PF8 provides eight hardware semaphore flags, addressed via A0–A2 during semaphore mode (SEM = VIL, CE = VIH or UB & LB = VIH). Each flag is readable on all I/O pins (I/O0–I/O15) and writable via I/O0 - enabling atomic lock/unlock operations without software race conditions.