Renesas 70V24L35PFI

Overview

70V24L35PFI from IDT (Integrated Device Technology) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 35 ns read cycle time, 3.3 V single-supply operation, and industrial temperature range (–40°C to +85°C). It integrates on-chip semaphore logic and BUSY/INT flags for inter-processor communication in real-time embedded systems.

For engineers reviewing the 70V24L35PFI datasheet, 70V24L35PFI pinout, 70V24L35PFI application, or 70V24L35PFI equivalent, key selection criteria include dual-port arbitration timing, low-power standby current (660 µA typ.), PLCC-84 package compatibility, and semaphore flag coherency under concurrent access.

Technical Context

The 70V24L35PFI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write operations to the same memory location without external arbitration logic. Its on-chip hardware semaphore system uses A0–A2 addressing to manage eight shared flags across both ports.

It supports MASTER/SLAVE cascading via M/S pin to expand data width beyond 16 bits, with BUSY output (Master) or input (Slave) signaling and non-tri-stated push-pull INT/BUSY outputs. All I/Os are LVTTL-compatible with VIH = 2.0 V min and VIL = 0.8 V max at VDD = 3.3 V ±0.3 V.

Key Specifications

Pinout & Package

70V24L35PFI is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), with body dimensions approximately 1.15 in × 1.15 in × 0.17 in. Pin 1 is located at the index corner; all VDD pins require connection to 3.3 V supply, and 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 CY7C1362BV33-133AXC and AS7C3256A-15JIN, the 70V24L35PFI uniquely delivers industrial-grade dual-port operation with integrated semaphore and BUSY signaling in a legacy-compatible PLCC-84 package-enabling drop-in replacement in existing 35 ns–qualified designs without layout change.

Availability

70V24L35PFI is available at Aetrix Electronics and suitable for motor control systems, industrial PLC backplanes, medical imaging pipelines, and digital signal processor interfaces requiring stable component supply and long-term industrial lifecycle support.

Supply support for 70V24L35PFI 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 sensor solutions for communications, computing, and industrial markets.

The IDT70V24 family was designed specifically for real-time embedded systems requiring deterministic, contention-free memory sharing between heterogeneous processors-targeting industrial automation, test equipment, and telecom infrastructure.

FAQ

What is the maximum operating frequency supported by the 70V24L35PFI?

The 70V24L35PFI supports a maximum read cycle time (tRC) of 35 ns, corresponding to a theoretical maximum sustained read frequency of 28.6 MHz. This value is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3 V ±0.3 V supply, with no derating required under datasheet-specified AC test conditions.

Does the 70V24L35PFI support true simultaneous read/write operations on both ports?

Yes, the 70V24L35PFI implements true dual-port SRAM architecture that permits simultaneous reads or writes to the same memory location from left and right ports without data corruption. Internal arbitration logic ensures coherent access, and BUSY/INT flags signal contention events to external controllers.

How is semaphore functionality implemented in the 70V24L35PFI?

The 70V24L35PFI provides eight hardware semaphore flags accessed via A0–A2 address lines and controlled by SEML/SEMR pins. When SEM is low, I/O0 writes to or reads from the selected flag; all I/O lines reflect the flag value during read cycles, enabling atomic lock/unlock operations without software intervention.

What is the standby current consumption of the 70V24L35PFI in full CMOS standby mode?

In full CMOS standby mode (ISB3), where both ports have CE inputs held above VDD – 0.2 V and all inputs biased to valid logic levels, the 70V24L35PFI consumes 660 µA typical current. This ultra-low quiescent draw supports battery-backed operation and thermal management in sealed industrial enclosures.

Is the 70V24L35PFI pin-compatible with other members of the IDT70V24 family?

Yes, the 70V24L35PFI shares identical 84-pin PLCC (PLG84) pinout with all IDT70V24 variants including 70V24L15PFI and 70V24L25PFI. Differences are limited to speed grade (tRC = 35 ns vs. 15/25 ns) and power optimization (L = low-power), allowing direct substitution in layouts designed for the same package.