Renesas 70V24L55PFI

Overview

70V24L55PFI from Integrated Device Technology (IDT) is an industrial-grade, 4K x 16-bit true dual-port static RAM with independent left/right asynchronous ports, 55 ns maximum read cycle time, 3.3 V ±0.3 V single supply, and 84-pin PLCC package. It supports simultaneous read/write access to the same memory location and is used in real-time inter-processor communication systems requiring deterministic latency and hardware semaphore arbitration.

For engineers reviewing the 70V24L55PFI datasheet, 70V24L55PFI pinout, 70V24L55PFI application, or 70V24L55PFI equivalent, key selection criteria include its 55 ns access timing, low 660 µW standby power, full on-chip semaphore logic, BUSY/INT flag signaling, and support for MASTER/SLAVE cascading in 32-bit+ memory expansion architectures.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, control, and I/O buses per port. It integrates dedicated on-chip arbitration logic to resolve contention between ports and provides eight hardware semaphore flags accessible via A0–A2 addressing.

The 70V24L55PFI uses CMOS high-performance technology and features LVTTL-compatible inputs/outputs, separate upper-byte (UBR/UBL) and lower-byte (LBR/LBL) enables, and Master/Slave select (M/S) for cascaded configurations - enabling error-free 32-bit bus expansion without external logic.

Key Specifications

Pinout & Package

84-pin Plastic Leaded Chip Carrier (PLG84) package, body size ≈ 1.15 in × 1.15 in × 0.17 in. Pin 1 marked by corner notch; all VDD pins require local decoupling; 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 CY7C024AV-55AXC and IDT70V25L55PF, the 70V24L55PFI uniquely combines 84-pin PLCC mechanical compatibility, integrated MASTER/SLAVE BUSY signaling, and industrial temperature rating - making it the sole option for retrofitting legacy industrial controllers without layout changes.

Availability

70V24L55PFI is available at Aetrix Electronics and suitable for industrial PLCs, real-time motion controllers, digital signal processing subsystems, and legacy system upgrades requiring stable component supply and long-term obsolescence management.

Supply support for 70V24L55PFI 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.

The IDT70V24 product line delivers high-speed, low-power dual-port SRAMs optimized for deterministic inter-processor communication in industrial automation, test equipment, and telecommunications infrastructure.

FAQ

What is the maximum operating temperature range for the 70V24L55PFI?

The 70V24L55PFI is rated for industrial temperature operation from -40°C to +85°C. This specification is guaranteed across all electrical parameters in the datasheet, including 55 ns access time and 660 µW standby power, making it suitable for deployment in harsh environments such as factory floors and outdoor base stations.

Does the 70V24L55PFI support hardware semaphore functionality?

Yes, the 70V24L55PFI includes full on-chip hardware semaphore logic supporting eight independent flags. These are accessed via address lines A0–A2 when SEM = VIL and CE = VIH (or UB & LB = VIH), enabling atomic read-modify-write operations essential for multi-processor synchronization without CPU overhead.

Can the 70V24L55PFI be used in MASTER/SLAVE cascaded configurations?

Yes, the 70V24L55PFI supports MASTER/SLAVE operation via the M/S pin: when M/S = VIH, BUSY is driven as an output (Master mode); when M/S = VIL, BUSY is accepted as an input (Slave mode). This allows multiple 70V24L55PFI devices to be cascaded for 32-bit+ bus expansion with automatic contention resolution.

What is the standby power consumption of the 70V24L55PFI?

The 70V24L55PFI achieves 660 µW typical standby power (ISB3) when both ports are disabled with CMOS-level inputs. This ultra-low quiescent power is critical for battery-backed or energy-constrained industrial systems where memory retention must persist during extended sleep cycles.

Is the 70V24L55PFI pin-compatible with other members of the IDT70V24 family?

No - the 70V24L55PFI uses an 84-pin PLCC package, while other speed grades (e.g., 70V24L25PFI) share the same PLCC footprint but differ only in timing specifications. However, it is not pin-compatible with the 100-pin TQFP variants like IDT70V25 or IDT70V35, which have different pin counts, signal assignments, and package dimensions.