Renesas 70V24L35PFI8

Overview

70V24L35PFI8 from Integrated Device Technology is a high-speed 4K x 16 dual-port static RAM with true asynchronous dual-port architecture, 35 ns read/write cycle time, 3.3 V single-supply operation, and industrial temperature range (–40°C to +85°C). It supports independent concurrent access from left and right ports for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 70V24L35PFI8 datasheet, 70V24L35PFI8 pinout, 70V24L35PFI8 application, or 70V24L35PFI8 equivalent, key selection criteria include dual-port arbitration logic, on-chip semaphore support, BUSY/INT flag signaling, byte-selectable I/O control, and low-power standby mode (660 µW typ.) - all critical for deterministic memory sharing in safety-critical industrial controllers.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, control, and data buses per port. It integrates hardware semaphore logic for eight shared flags addressed via A0–A2, and uses on-chip arbitration to resolve simultaneous access contention without external logic.

Port arbitration is managed by dedicated BUSY flag signaling (output on Master, input on Slave), M/S select pin configuration, and non-tri-stated push-pull INT/BUSY outputs. The device supports multiplexed bus compatibility via independent upper- and lower-byte enables (UBR/UBL, LBR/LBL) and operates across full industrial voltage (3.0–3.6 V) and temperature (–40°C to +85°C) ranges.

Key Specifications

Pinout & Package

70V24L35PFI8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), body size ≈ 1.15 in × 1.15 in × 0.17 in, with gull-wing leads and internal heat slug. All VDD pins require local decoupling; all VSS pins must be solidly 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 IDT70V25L25PFI, the 70V24L35PFI8 delivers optimal balance of deterministic latency, integrated hardware arbitration, and ultra-low standby power in a rugged 84-pin PLCC - making it uniquely suited for space-constrained, safety-critical industrial control where predictability trumps peak speed.

Availability

70V24L35PFI8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, real-time motor drive controllers, avionics data concentrators, and railway signaling interlocking units requiring stable component supply and long-term lifecycle assurance.

Supply support for 70V24L35PFI8 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 product line delivers high-reliability dual-port SRAMs optimized for deterministic inter-processor communication in harsh-environment applications - emphasizing hardware arbitration, low-power operation, and industrial-grade qualification.

FAQ

What is the maximum operating temperature range for the 70V24L35PFI8?

The 70V24L35PFI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the Absolute Maximum Ratings table and confirmed in the DC Electrical Characteristics section for the "Industrial" grade column. Operation outside this range may result in parametric degradation or functional failure.

Does the 70V24L35PFI8 support hardware semaphore functionality?

Yes, the 70V24L35PFI8 includes full on-chip hardware support for eight semaphore flags. These are accessed via A0–A2 address lines with SEM enable, and support atomic read/write operations as defined in Truth Table II. The 70V24L35PFI8 implements dedicated SEML/SEMR pins and associated timing (tSOP, tSAA) to ensure contention-free resource locking.

What package type is used for the 70V24L35PFI8?

The 70V24L35PFI8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), designated PLG84 per the datasheet. Pin configuration diagrams confirm the top-view layout with corner index mark, and mechanical dimensions specify ≈1.15 in × 1.15 in × 0.17 in body size. A12 is explicitly marked as No Connect (NC) for this variant.

How does the BUSY flag operate in master/slave configurations with the 70V24L35PFI8?

In master configuration (M/S = VIH), the 70V24L35PFI8 asserts BUSYL/BUSYR as an output during internal arbitration or write cycles. In slave configuration (M/S = VIL), BUSYL/BUSYR becomes an input that must be monitored before initiating writes. This handshake prevents simultaneous access to shared addresses and is fundamental to the 70V24L35PFI8's deterministic behavior.

What is the standby current consumption of the 70V24L35PFI8?

The 70V24L35PFI8 exhibits a typical standby current of 660 µW under ISB3 conditions (both ports fully disabled with CMOS-level inputs). This value is specified in the DC Electrical Characteristics table for the "70V24L" variant and reflects its low-power L-series design - significantly lower than the S-series counterpart (3.3 mW typ.), making it ideal for energy-sensitive applications.