Renesas 70V24L15PFI

Overview

IDT70V24L15PFI from Integrated Device Technology is a high-speed 4K × 16 dual-port static RAM with true independent left/right port access, 15 ns read cycle time (max), 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 control systems.

For engineers reviewing the IDT70V24L15PFI datasheet, IDT70V24L15PFI pinout, IDT70V24L15PFI application, or IDT70V24L15PFI equivalent, key selection criteria include dual-port arbitration timing, 84-pin PLCC package compatibility, low-power standby current (660 µA typ.), and semaphore flag coherency in multi-CPU memory sharing architectures.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, data, and control buses per port. It supports master/slave cascading via M/S pin to expand bus width beyond 16 bits while maintaining full-speed concurrent access without external logic.

On-chip hardware semaphore logic enables eight shared resource flags accessed via A0–A2, with dedicated SEM enable and contention window timing (tSPS = 5 ns). BUSY flag behavior differs by port role: output on Master, input on Slave - critical for deterministic arbitration in tightly coupled multiprocessing.

Key Specifications

Pinout & Package

84-pin Plastic Leaded Chip Carrier (PLG84) package, body size ≈ 1.15 in × 1.15 in × 0.17 in. All VDD pins require local 3.3 V decoupling; all VSS pins must be connected to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15AXC and IDT70V25L15PF, IDT70V24L15PFI uniquely delivers industrial-grade 84-pin PLCC packaging with guaranteed 15 ns timing and integrated semaphore logic - enabling direct replacement in legacy through-hole embedded controllers without layout change or firmware modification.

Availability

IDT70V24L15PFI is available at Aetrix Electronics and suitable for industrial motor control, real-time OS co-processing, and programmable logic controller (PLC) applications requiring stable component supply and long-term obsolescence management.

Supply support for IDT70V24L15PFI 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 signal conditioning ICs for communications, computing, and industrial markets.

IDT70V24L15PFI belongs to the IDT70V24 family of high-speed dual-port SRAMs designed specifically for deterministic inter-processor communication in real-time embedded systems with strict timing and reliability requirements.

FAQ

What is the maximum operating frequency supported by IDT70V24L15PFI?

IDT70V24L15PFI supports a maximum read cycle time (tRC) of 15 ns, corresponding to a theoretical maximum operating frequency of 66.7 MHz. This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3 V ± 0.3 V supply, making IDT70V24L15PFI suitable for high-throughput real-time control loops without derating.

Does IDT70V24L15PFI support true simultaneous read operations on both ports?

Yes, IDT70V24L15PFI implements true dual-port SRAM cells that allow concurrent reads from both left and right ports to the same memory location without contention or delay. This capability is fundamental to its use in lock-free inter-processor communication and is verified in the functional block diagram and truth table I of the official datasheet.

How does the BUSY flag function in master versus slave configuration for IDT70V24L15PFI?

In master configuration (M/S = VIH), BUSYL/BUSYR are outputs signaling internal port contention; in slave configuration (M/S = VIL), they become inputs synchronized to the master's BUSY assertion. This dual-role design enables hierarchical arbitration in cascaded systems - a feature explicitly documented in datasheet Notes 2 and 3 for IDT70V24L15PFI.

What is the purpose of the SEM pin and how are semaphore flags accessed in IDT70V24L15PFI?

The SEM pin (SEML/SEMR) enables access to eight hardware semaphore flags addressed by A0–A2. When SEM = VIL and CE = VIH (or UB & LB = VIH), the I/O pins reflect semaphore values; writing to I/O0 updates the selected flag. This atomic operation is timed by tSOP (10 ns min) and tSAA (15 ns max), as specified in AC Electrical Characteristics Table 11d for IDT70V24L15PFI.

Is IDT70V24L15PFI pin-compatible with other members of the IDT70V24 family?

IDT70V24L15PFI shares identical 84-pin PLCC pinout with all IDT70V24 variants (e.g., IDT70V24S15PFI, IDT70V24L20PFI), differing only in speed grade and power optimization. Pin compatibility is confirmed in the "Pin Configurations" section (page 4) of the datasheet, where A12L/A12R are marked NC for all IDT70V24 devices - ensuring drop-in replacement within the same speed/power bin.