Renesas 70V24S20PF8

Overview

70V24S20PF8 from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right ports, 20 ns maximum access time (commercial/industrial), 3.3 V single-supply operation, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous read/write access to the same memory location in real-time communication buffers and FPGA co-processor interfaces.

For engineers reviewing the 70V24S20PF8 datasheet, 70V24S20PF8 pinout, 70V24S20PF8 application, or 70V24S20PF8 equivalent, key selection criteria include dual-port arbitration timing, byte-select control for multiplexed bus compatibility, industrial temperature support (–40°C to +85°C), and PLCC-84 package footprint for legacy board designs.

Technical Context

The 70V24S20PF8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port - enabling concurrent read/write operations without external arbitration logic. Its on-chip hardware semaphore logic supports eight shared flags addressed via A0–A2, with dedicated SEM, INT, and BUSY signaling for inter-processor synchronization.

It uses CMOS high-performance fabrication for low-power operation: 400 mW typical active power and 660 µW typical standby power. The device supports MASTER/SLAVE cascading for 32-bit+ data width expansion using M/S pin configuration and BUSY flag handshaking between devices.

Key Specifications

Pinout & Package

70V24S20PF8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), with body dimensions approximately 1.15 in × 1.15 in × 0.17 in. All VDD pins require connection to 3.3 V supply; 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-20AXC, 70V24S20PF8 offers native PLCC-84 compatibility and hardware BUSY arbitration; compared with IDT70V25S20PF8, it provides optimal cost/performance balance for 64 Kbit buffer requirements without over-provisioning memory.

Availability

70V24S20PF8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, and medical imaging subsystems requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for 70V24S20PF8 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs before its acquisition by Renesas Electronics in 2019. IDT delivered high-performance, low-power solutions for communications and computing infrastructure.

The IDT70V24 product line delivers high-speed dual-port SRAMs optimized for real-time inter-processor communication, FPGA co-processing, and deterministic data buffering in industrial, aerospace, and medical systems.

FAQ

What is the maximum operating temperature range supported by the 70V24S20PF8?

The 70V24S20PF8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and validated across DC and AC electrical characteristics for both commercial and industrial grades. The device maintains full functionality-including 20 ns access time and semaphore arbitration-across this entire range without derating.

Does the 70V24S20PF8 support true simultaneous read/write operations to the same memory address?

Yes, the 70V24S20PF8 implements true dual-port SRAM cells that allow simultaneous reads of the same memory location from both ports. The datasheet explicitly states this capability in the Features section and confirms it via the Functional Block Diagram showing independent I/O paths. Concurrent writes to the same address are prevented by hardware BUSY arbitration, ensuring data integrity.

What is the function of the M/S pin on the 70V24S20PF8, and how does it affect BUSY behavior?

The M/S pin configures the 70V24S20PF8 as either Master (M/S = VIH) or Slave (M/S = VIL). In Master mode, BUSYL/BUSYR are outputs indicating local port contention; in Slave mode, they become inputs accepting BUSY signals from a Master device. This enables daisy-chained arbitration in multi-device systems, as documented in Note 2 of the Pin Configurations section.

How many semaphore flags does the 70V24S20PF8 provide, and how are they accessed?

The 70V24S20PF8 provides eight hardware semaphore flags, addressed via A0–A2 and controlled by the SEM pin. When SEM = VIL and CE = VIH (or UB & LB = VIH), the device enters semaphore mode - allowing I/O0 to write and all I/O lines (I/O0–I/O15) to read flag states. This is detailed in Truth Table II and the Semaphore Read/Write Control description.

Is the 70V24S20PF8 pin-compatible with other members of the IDT70V24/25 family?

Yes, the 70V24S20PF8 shares identical 84-pin PLCC pinout with all IDT70V24 variants (e.g., 70V24L15, 70V24S35) and is footprint-compatible with IDT70V25S20PF8. Pin assignments for control, address, and I/O signals are consistent across the family, as verified in the Pin Configurations section where A12 is NC for both 70V24 and 70V25. This enables drop-in replacement within the same speed grade.