Renesas 70V24S25PF

Overview

70V24S25PF 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 (commercial 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 access to shared memory.

For engineers reviewing the 70V24S25PF datasheet, 70V24S25PF pinout, 70V24S25PF application, or 70V24S25PF equivalent, this page delivers verified specifications, validated PLCC-84 pin mapping, industrial-grade timing behavior, and direct alternatives for dual-port SRAM migration in embedded control, telecom switching, and FPGA co-processor designs.

Technical Context

The 70V24S25PF implements fully asynchronous dual-port architecture with separate address, data, and control buses per port, enabling simultaneous non-blocking reads from the same memory location. It integrates hardware semaphore logic for eight shared flags addressed via A0–A2, supporting atomic test-and-set operations across ports without external logic.

Its arbitration logic resolves port contention using BUSY flag signaling in master/slave cascading configurations, while LVTTL-compatible I/Os operate at 3.3 V ±0.3 V with TTL-level input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and guaranteed output drive (VOH ≥ 2.4 V at –4 mA, VOL ≤ 0.4 V at +4 mA).

Key Specifications

Pinout & Package

70V24S25PF is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), measuring approximately 1.15 in × 1.15 in × 0.17 in, with gull-wing leads suitable for through-hole assembly and rework-friendly socketing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-25JC and AS7C34096A-25JC, the 70V24S25PF uniquely delivers integrated hardware semaphore arbitration, 3.3 V native operation, and master/slave expandability - reducing BOM count and PCB area in tightly coupled multi-processor systems.

Availability

70V24S25PF is available at Aetrix Electronics and suitable for telecom switching, industrial PLC I/O mapping, and FPGA co-processor buffering requiring stable component supply and long-term obsolescence management.

Supply support for 70V24S25PF 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 solutions for communications, computing, and industrial markets.

The IDT70V24 family was designed specifically for high-reliability, low-latency inter-processor communication in real-time embedded systems - emphasizing deterministic timing, hardware-based arbitration, and seamless integration with LVTTL and 3.3 V logic families.

FAQ

What is the maximum operating frequency supported by the 70V24S25PF?

The 70V24S25PF does not specify a maximum clock frequency because it is an asynchronous SRAM. Its performance is defined by timing parameters: 25 ns maximum access time (tAA), 25 ns read cycle time (tRC), and 25 ns write cycle time (tWC). These values enable reliable operation with controllers running up to ~33 MHz effective bus bandwidth when accounting for setup/hold and enable delays.

Does the 70V24S25PF support industrial temperature range operation?

No, the 70V24S25PF is rated for commercial temperature range only (0°C to +70°C). For industrial operation (–40°C to +85°C), IDT offers the 70V24L15 variant - which shares the same PLCC-84 package and pinout but features 15 ns speed grade and extended thermal qualification.

How is semaphore functionality implemented in the 70V24S25PF?

The 70V24S25PF implements eight hardware semaphore flags accessible via address lines A0–A2. When SEM is asserted low, the device enters semaphore mode: writing to I/O0 sets the flag, and reading returns its state across all I/O pins (I/O0–I/O15). This enables atomic test-and-set operations without software intervention or external latches.

Can the 70V24S25PF be used in a master/slave configuration with other dual-port SRAMs?

Yes, the 70V24S25PF supports master/slave cascading via the M/S pin. When M/S = VIH, BUSY is driven as an output (master); when M/S = VIL, BUSY is accepted as an input (slave). This allows multiple 70V24S25PF devices to be chained for 32-bit or wider memory expansion without external arbitration logic.

What are the power consumption characteristics of the 70V24S25PF in standby mode?

In full standby mode (both ports disabled with CMOS-level inputs), the 70V24S25PF draws ≤2.5 mA (ISB3). With TTL-level inputs and both CE pins high, standby current is ≤16 mA (ISB1). These values reflect typical operation at VDD = 3.3 V and TA = +25°C, enabling efficient power gating in battery-aware or thermally constrained designs.