Renesas 70V24S25PF8

Overview

70V24S25PF8 from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 25 ns maximum access time, 3.3 V single-supply operation, and integrated on-chip semaphore logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 70V24S25PF8 datasheet, 70V24S25PF8 pinout, 70V24S25PF8 application, or 70V24S25PF8 equivalent, this device supports simultaneous read/write access to shared memory, hardware port arbitration, BUSY/INT flag signaling, and master/slave cascading for wider bus expansion - critical for FPGA-to-processor co-processing, telecom packet buffering, and industrial motion control architectures.

Technical Context

The 70V24S25PF8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port, enabling concurrent access without external arbitration logic. It features dedicated upper-byte (UBR/UBL) and lower-byte (LBR/LBL) enables, Master/Slave select (M/S), and non-tri-stated push-pull BUSY and INT outputs.

On-chip semaphore logic uses A0–A2 addressing to manage eight shared flags across ports, with tSWRD ≤ 5 ns write-to-read latency and tSPS = 5 ns contention window. Power management includes TTL- and CMOS-level standby modes, with ISB3 ≤ 0.2 mA (typ.) in full CMOS standby.

Key Specifications

Pinout & Package

70V24S25PF8 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 lead finish SnPb. 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 CY7C1362BV33-25AXI and IDT70V25S25PF8, the 70V24S25PF8 delivers identical timing and industrial temperature support in a legacy-compatible PLCC package with optimized pinout for master/slave daisy-chaining - making it the preferred choice for retrofitting or maintaining existing industrial control designs.

Availability

70V24S25PF8 is available at Aetrix Electronics and suitable for industrial motion controllers, telecom packet buffers, FPGA-to-MCU co-processing systems, and avionics data loggers requiring stable component supply, long-term obsolescence mitigation, and traceable sourcing.

Supply support for 70V24S25PF8 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 real-time embedded systems - emphasizing hardware arbitration, semaphore support, and industrial temperature reliability over density or cost-per-bit.

FAQ

What is the maximum operating frequency supported by the 70V24S25PF8?

The 70V24S25PF8 does not operate at a fixed clock frequency; it is an asynchronous SRAM. Its maximum effective throughput is determined by its 25 ns access time (tAA), enabling read cycles as fast as 40 MHz (1/25 ns) under ideal conditions. Actual system bandwidth depends on CE, OE, and byte-enable timing margins and bus protocol overhead.

Does the 70V24S25PF8 support simultaneous read and write operations on the same memory location?

Yes, the 70V24S25PF8 implements true dual-port SRAM cells that allow simultaneous read and write operations to the same address - one port reading while the other writes - with no bus contention or data corruption. The BUSY flag indicates arbitration status only during conflicting write-write scenarios.

What is the function of the M/S pin on the 70V24S25PF8, and how is it used in cascaded configurations?

The M/S (Master/Slave Select) pin configures the 70V24S25PF8 as either a master (M/S = VIH) or slave (M/S = VIL). In master mode, BUSY is an output flag; in slave mode, BUSY is an input. When cascading two devices for 32-bit bus width, the master asserts BUSY to stall the slave during internal arbitration, ensuring coherent multi-word transfers.

How does the semaphore functionality work in the 70V24S25PF8, and what are its timing constraints?

The 70V24S25PF8 provides eight hardware semaphore flags accessed via A0–A2 address lines when SEM is low. Writing to I/O0 sets the flag; reading returns the value across all I/O pins. Critical timing includes tSWRD ≤ 5 ns (write-to-read delay) and tSPS = 5 ns (contention window), ensuring deterministic lock acquisition in multi-processor systems.

Is the 70V24S25PF8 RoHS-compliant, and what is its lead finish?

The 70V24S25PF8 is not RoHS-compliant in its standard configuration; it uses a SnPb (tin-lead) lead finish as specified in the PLG84 package documentation. For RoHS-compliant alternatives, consult IDT's green-part ordering information - though no SnPb-free PLCC variant of this exact speed grade is documented in the provided datasheet.