Renesas 70V24S20PFI8

Overview

70V24S20PFI8 from Integrated Device Technology is a high-speed 4K x 16 dual-port static RAM with true independent left/right port access, 20 ns maximum access time (industrial grade), 3.3 V single-supply operation, and on-chip semaphore arbitration logic - used in real-time inter-processor communication systems requiring concurrent read/write to shared memory without external logic.

For engineers reviewing the 70V24S20PFI8 datasheet, 70V24S20PFI8 pinout, 70V24S20PFI8 application, or 70V24S20PFI8 equivalent, this page delivers verified timing specs, industrial-temperature PLCC-84 package details, BUSY/INT flag behavior, byte-select control mapping, and direct alternatives for dual-port SRAM migration in embedded control, telecom switching, and FPGA co-processor interfaces.

Technical Context

The 70V24S20PFI8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port, enabling simultaneous non-contention reads/writes to any memory location. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports master/slave cascading for 32-bit+ bus expansion.

It integrates full hardware semaphore signaling across both ports using A0–A2 addressing of eight shared flags, with dedicated SEM, UB/LB, and M/S pins. All I/Os are LVTTL-compatible, and power management includes CE-controlled active/standby modes with typ. 400 mW active and 660 µW standby current.

Key Specifications

Pinout & Package

84-pin Plastic Leaded Chip Carrier (PLG84), body size ≈ 1.15 in × 1.15 in × 0.17 in, with internal heatsink pad and standard PLCC lead pitch. Pin 1 index corner marked; all VDD pins require local decoupling, all VSS pins tied to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-20AXC and AS7C34098B-20TIN, the 70V24S20PFI8 uniquely combines industrial-grade PLCC-84 packaging, integrated master/slave BUSY signaling, and hardware semaphore support - enabling drop-in replacement in legacy IDT-based systems while reducing system-level arbitration overhead.

Availability

70V24S20PFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and FPGA co-processor applications requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature performance.

Supply support for 70V24S20PFI8 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 sensor signal conditioning ICs for communications, computing, and industrial markets.

The IDT70V24 product line delivers high-speed dual-port SRAMs optimized for real-time inter-processor communication, featuring on-chip arbitration, semaphore logic, and industrial temperature qualification - targeting embedded control, test equipment, and network switching applications.

FAQ

What is the maximum operating frequency supported by the 70V24S20PFI8?

The 70V24S20PFI8 does not specify a maximum clock frequency, as it is an asynchronous SRAM. Its timing is defined by access parameters: tRC = 20 ns (read cycle time), tAA = 20 ns (address access), and tACE = 20 ns (chip enable access). These values support reliable operation in systems with ≤50 MHz effective bus bandwidth, assuming proper setup/hold margins and PCB layout.

Does the 70V24S20PFI8 support true simultaneous read/write to the same memory address?

Yes, the 70V24S20PFI8 implements true dual-port SRAM cells that allow concurrent reads from both ports to the same address. However, simultaneous write-to-write or write-to-read to the same location triggers BUSY flag assertion on the contending port, requiring software or hardware arbitration - the memory array itself does not permit destructive concurrent writes.

How is the semaphore functionality implemented in the 70V24S20PFI8?

The 70V24S20PFI8 provides eight hardware semaphore flags accessed via A0–A2 address lines when SEM is low and CE/UB/LB are high. Each flag is a single-bit register readable from all I/O pins (I/O0–I/O15) and writable via I/O0. This enables lock-free inter-processor synchronization without CPU polling or external logic.

Can the 70V24S20PFI8 be used in a master/slave configuration with other IDT dual-port SRAMs?

Yes, the 70V24S20PFI8 supports master/slave cascading via the M/S pin: VIH configures it as master (BUSY output), VIL as slave (BUSY input). When cascaded with another 70V24S20PFI8 or IDT70V25/34 family device, it enables 32-bit-wide memory expansion with automatic BUSY coordination - no external arbitration logic required.

What are the power consumption characteristics of the 70V24S20PFI8 in standby mode?

In full standby (ISB3), with both ports disabled using CMOS-level inputs (CE > VDD − 0.2 V), the 70V24S20PFI8 draws only 0.2 µA typical (5 µA max) at VDD = 3.3 V. With TTL-level inputs (ISB1), standby current is 11 mA typical (25 mA max) - design choice depends on driving logic family and required power savings.