Renesas 70V24L20PF8

Overview

70V24L20PF8 from Integrated Device Technology is a high-speed 4K x 16 dual-port static RAM with independent left/right asynchronous ports, 20 ns maximum access time, 3.3 V single supply, and 660 µW typical standby power. It supports full on-chip semaphore signaling and BUSY flag arbitration for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 70V24L20PF8 datasheet, 70V24L20PF8 pinout, 70V24L20PF8 application, or 70V24L20PF8 equivalent, key selection criteria include industrial temperature range (–40°C to +85°C), 84-pin PLCC package, true dual-port read/write concurrency, and integrated hardware arbitration without external logic.

Technical Context

The 70V24L20PF8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves simultaneous access contention using BUSY flag handshake and master/slave configuration via M/S pin.

It integrates eight semaphore registers accessible via A0–A2 and controlled by SEM, CE, UB/LB signals - enabling inter-processor synchronization without software polling. All I/Os are LVTTL-compatible with 3.3 V ±0.3 V supply and support byte-selectable upper/lower data writes.

Key Specifications

Pinout & Package

70V24L20PF8 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 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, 70V24L20PF8 offers through-hole PLCC compatibility and integrated master/slave arbitration; versus IDT70V25L20PF8, it provides cost-optimized 4K capacity while retaining identical timing, package, and feature set - ideal for fixed-function embedded controllers.

Availability

70V24L20PF8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics display subsystems, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for 70V24L20PF8 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70V24 family delivers low-latency, hardware-arbitrated dual-port SRAMs optimized for real-time inter-processor communication in deterministic embedded systems - especially where PCB space, power, and reliability are constrained.

FAQ

What is the maximum operating frequency supported by the 70V24L20PF8?

The 70V24L20PF8 has a 20 ns maximum access time, supporting effective bus frequencies up to 50 MHz in non-multiplexed configurations. Its fully asynchronous design means no internal clock is required - timing is governed solely by setup/hold and access specifications across CE, OE, R/W, and address signals. Real-world throughput depends on system-level bus protocol but remains bounded by tRC = 20 ns.

Does the 70V24L20PF8 support simultaneous read operations from both ports to the same memory address?

Yes, the 70V24L20PF8 implements true dual-port SRAM cells that allow concurrent reads from both left and right ports to the same address without contention or delay. This capability is inherent to its cell architecture and requires no arbitration - unlike pseudo-dual-port devices - making it ideal for mirrored data access in redundant control systems.

How does the BUSY flag function in master/slave configuration for the 70V24L20PF8?

In master/slave mode, the 70V24L20PF8 uses the M/S pin to configure BUSY behavior: when M/S = VIH, the device operates as master and asserts BUSYR/BUSYL as outputs to signal port contention; when M/S = VIL, it acts as slave and expects BUSY input on the corresponding port. This enables hardware-enforced flow control during cascaded multi-device memory expansion.

Can the 70V24L20PF8 be used in a single-port configuration?

Yes, the 70V24L20PF8 can operate in single-port mode by tying one port's chip enable (e.g., CER) permanently high and using only the other port's control and data lines. All timing and electrical specifications remain valid, and standby current drops further when the disabled port's CE is held high - simplifying migration from legacy single-port SRAMs without redesigning memory controllers.

What is the purpose of the semaphore feature in the 70V24L20PF8, and how is it accessed?

The 70V24L20PF8 includes eight hardware semaphore flags for inter-processor synchronization. They are accessed by setting SEM = VIL, CE = VIH (or UB & LB = VIH), and addressing via A0–A2. I/O0 writes the flag value; all I/O pins (I/O0–I/O7) read it back. This enables atomic test-and-set operations without software intervention - critical for deterministic real-time task coordination.