Renesas 70V24L20PFI

Overview

70V24L20PFI from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 20 ns max access time, 3.3 V ±0.3 V single supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous read/write operations across ports and is used in real-time DSP co-processing, FPGA inter-processor communication, and legacy bus arbitration systems.

For engineers reviewing the 70V24L20PFI datasheet, 70V24L20PFI pinout, 70V24L20PFI application, or 70V24L20PFI equivalent, key selection criteria include dual-port arbitration logic, semaphore flag support, byte-select control for multiplexed bus compatibility, low-power standby (660 µW typ.), and PLCC-84 packaging for through-hole industrial designs.

Technical Context

The 70V24L20PFI implements full on-chip hardware semaphore signaling using A0–A2 address lines to access eight shared flags, enabling deterministic resource locking between independent processors. Its port arbitration logic resolves contention automatically without external logic, and BUSY/INT flags provide synchronous status signaling.

It operates fully asynchronously from either port, with separate CE, R/W, OE, UB/LB, and SEM controls per side. The device uses CMOS high-performance fabrication and supports MASTER/SLAVE cascading for 32-bit+ memory expansion via M/S pin configuration.

Key Specifications

Pinout & Package

84-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 1.15 in × 1.15 in × 0.17 in, with internal heatsink pad not electrically connected. Pin 1 marked by corner notch; pins numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-20AXC and IDT70V25L20PF, the 70V24L20PFI uniquely delivers industrial-grade 4K x 16 dual-port SRAM in a through-hole PLCC-84 package with 660 µW standby - making it irreplaceable for field-upgradeable, vibration-prone, or legacy-replacement designs where mounting method and ultra-low quiescent power are decisive.

Availability

70V24L20PFI is available at Aetrix Electronics and suitable for industrial PLCs, real-time DSP subsystems, and FPGA-based embedded controllers requiring stable component supply, long-term lifecycle support, and guaranteed PLCC-84 availability.

Supply support for 70V24L20PFI 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 power management ICs for communications, computing, and industrial markets.

The IDT70V24 family was designed specifically for deterministic, low-latency inter-processor communication in harsh industrial environments - emphasizing robust dual-port arbitration, hardware semaphore support, and extended temperature reliability over raw speed or density.

FAQ

What is the maximum operating frequency supported by the 70V24L20PFI?

The 70V24L20PFI does not specify a maximum clock frequency because it is an asynchronous SRAM. Its performance is defined by timing parameters: tRC (read cycle time) is 20 ns max, enabling effective operation up to 50 MHz in tightly controlled systems. Actual throughput depends on system-level timing margins, bus loading, and control signal sequencing - not a fixed clock input.

Does the 70V24L20PFI support simultaneous read and write operations on the same memory location?

Yes, the 70V24L20PFI supports true simultaneous read and write to the same address via its independent left and right ports. When contention occurs, the on-chip arbitration logic asserts BUSYL/BUSYR to signal conflict, and the internal design ensures data integrity - the write completes and the read returns valid data after tBDD delay, as specified in the timing diagrams.

How is semaphore functionality implemented in the 70V24L20PFI?

The 70V24L20PFI implements eight hardware semaphore flags accessed via A0–A2 address lines. 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; reading returns all eight bits across I/O0–I/O7. This enables atomic test-and-set operations without CPU intervention or external logic.

Can the 70V24L20PFI be used in MASTER/SLAVE configurations, and how is that configured?

Yes, the 70V24L20PFI supports MASTER/SLAVE cascading for 32-bit+ data bus expansion. Configuration is done via the M/S pin: VIH sets the device as MASTER (BUSY pin becomes output), VIL sets it as SLAVE (BUSY pin becomes input). Multiple devices synchronize via shared BUSY chaining, enabling error-free expansion without additional arbitration circuitry.

What are the power consumption characteristics of the 70V24L20PFI in standby mode?

In full standby mode (both ports disabled with CMOS-level inputs), the 70V24L20PFI draws only 660 µW typical (ISB3), verified across –40°C to +85°C. This ultra-low quiescent power is achieved via internal power-gating and is critical for battery-backed systems or energy-sensitive industrial nodes where continuous memory retention is required without significant drain.