Renesas 70V24L55PF8

Overview

70V24L55PF8 from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time, 3.3 V ±0.3 V single supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access, on-chip semaphore arbitration, and byte-selectable I/O for multiplexed bus compatibility in real-time inter-processor communication systems.

For engineers reviewing the 70V24L55PF8 datasheet, 70V24L55PF8 pinout, 70V24L55PF8 application, or 70V24L55PF8 equivalent, key selection criteria include its 55 ns access timing, 84-pin PLCC package with confirmed pin mapping, low standby current (660 µA typ.), full hardware semaphore support, and master/slave cascading capability for wider data buses.

Technical Context

The 70V24L55PF8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O lines per port-enabling concurrent read/write operations without external arbitration logic. Its on-chip arbitration resolves port contention via BUSY flag signaling and supports both master and slave configurations using the M/S pin.

It integrates full hardware semaphore logic across eight flags (addressed by A0–A2), allowing inter-port synchronization without software overhead. The device uses CMOS process technology and operates exclusively from a 3.3 V supply, with TTL-compatible inputs and push-pull BUSY/INT outputs.

Key Specifications

Pinout & Package

70V24L55PF8 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. 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, the 70V24L55PF8 offers integrated BUSY arbitration and PLCC packaging for legacy-compatible designs; versus IDT70V25L55PF8, it provides identical timing and interface with reduced memory size for cost-optimized implementations.

Availability

70V24L55PF8 is available at Aetrix Electronics and suitable for industrial PLC modules, real-time inter-processor communication links, digital signal processing buffers, and legacy bus interface bridges requiring stable component supply and long-term lifecycle support.

Supply support for 70V24L55PF8 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-speed, low-power dual-port SRAMs optimized for deterministic inter-processor communication, real-time buffering, and legacy system bridging - emphasizing hardware arbitration, industrial temperature reliability, and drop-in replaceability.

FAQ

What is the maximum operating temperature range for the 70V24L55PF8?

The 70V24L55PF8 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 µA standby current. No derating is required within this range, making the 70V24L55PF8 suitable for harsh environments such as factory automation controllers and outdoor telecom equipment.

Does the 70V24L55PF8 support true simultaneous read operations on both ports?

Yes, the 70V24L55PF8 implements true dual-port SRAM cells that allow simultaneous reads from the same memory location on left and right ports without contention or data corruption. This behavior is inherent to the cell architecture and does not require BUSY flag monitoring or external arbitration - enabling lock-free data sharing in real-time systems using the 70V24L55PF8.

How is semaphore functionality implemented in the 70V24L55PF8?

The 70V24L55PF8 includes eight dedicated hardware semaphore flags accessed via A0–A2 address lines and controlled by the SEML/SEMR pins. Writing to I/O0 updates the selected flag; reading returns the flag value across all I/O lines (I/O0–I/O15). This fully autonomous logic eliminates CPU polling and guarantees atomicity - a core capability of the 70V24L55PF8 for inter-processor synchronization.

What is the function of the M/S pin on the 70V24L55PF8?

The M/S (Master/Slave Select) pin configures the 70V24L55PF8 for cascaded operation: when driven high (VIH), it operates as a Master with BUSYR as an output flag; when driven low (VIL), it becomes a Slave with BUSYR as an input. This enables multi-device 32-bit+ memory expansion using daisy-chained BUSY handshaking - a defining feature of the 70V24L55PF8 architecture.

Is the 70V24L55PF8 pin-compatible with other members of the IDT70V24 family?

Yes, the 70V24L55PF8 shares identical 84-pin PLCC pinout and signal mapping with all speed grades (e.g., 70V24L15PF8, 70V24L25PF8) and variants (e.g., 70V24S55PF8) in the IDT70V24 family. Differences are limited to AC timing specifications and power consumption - allowing direct substitution in existing designs without layout changes or firmware modification for the 70V24L55PF8.