Renesas 70V25S55PF8

Overview

70V25S55PF8 from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 55 ns maximum read cycle time, 3.3 V ±0.3 V single-supply operation, and integrated on-chip semaphore logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 70V25S55PF8 datasheet, 70V25S55PF8 pinout, 70V25S55PF8 application, or 70V25S55PF8 equivalent, this device supports simultaneous non-blocking reads/writes across two independent buses in telecom line cards, industrial PLCs, and FPGA co-processor memory buffers where deterministic latency and hardware arbitration are required.

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, control, and I/O pins per port, enabling concurrent access to any memory location without external arbitration logic. It features dedicated BUSY flag signaling, MASTER/SLAVE cascading capability via M/S pin, and full hardware semaphore support using A0–A2 addressing for eight shared flags.

It operates exclusively at 3.3 V with LVTTL-compatible I/O levels, includes automatic power-down via CE control, and supports byte-selectable upper/lower data access (UBL/LBL) for multiplexed bus compatibility. The 55 ns speed grade targets commercial-temperature applications requiring moderate bandwidth with low standby power (660 µW typical).

Key Specifications

Pinout & Package

70V25S55PF8 is housed in a 100-pin TQFP (PNG100) package measuring 14 mm × 14 mm × 1.4 mm, with 48 I/O pins (24 per port), 26 address/control lines, and 26 power/ground pins. All VDD and VSS pins require local decoupling per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-55AXC and IDT70V24S55PF8, the 70V25S55PF8 uniquely delivers hardware semaphore support, MASTER/SLAVE configuration, and full 16-bit dual-port performance in a drop-in-compatible 100-pin TQFP-enabling scalable, low-jitter memory architectures without external glue logic.

Availability

70V25S55PF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and FPGA-based embedded systems requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for 70V25S55PF8 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 and computing markets.

The IDT70V25 product line delivers high-speed dual-port SRAMs optimized for real-time inter-processor communication in telecom, industrial control, and embedded systems where deterministic latency and hardware arbitration are critical.

FAQ

What is the maximum operating frequency supported by the 70V25S55PF8?

The 70V25S55PF8 does not specify a clock frequency because it is an asynchronous SRAM. Its performance is defined by timing parameters: 55 ns maximum read cycle time (tRC), 55 ns maximum address access time (tAA), and 55 ns maximum chip enable access time (tACE). These values establish a practical upper limit of approximately 18 MHz for continuous burst reads under worst-case conditions, though actual throughput depends on system-level timing margins and bus protocol.

Does the 70V25S55PF8 support simultaneous read and write operations on both ports?

Yes, the 70V25S55PF8 supports fully independent simultaneous read and write operations on left and right ports-including reads and writes to the same memory address. When both ports access the same location concurrently, the BUSY flag asserts to signal contention, and internal arbitration ensures data integrity. This behavior is inherent to its true dual-port SRAM cell design and requires no external logic.

How is semaphore functionality implemented in the 70V25S55PF8?

The 70V25S55PF8 implements eight hardware semaphore flags using dedicated registers addressed by A0–A2. Access occurs in semaphore mode when SEM is low and either CE is high or both UB and LB are high. Writing to I/O0 updates the selected flag; reading returns the flag state across all I/O lines (I/O0–I/O15). This provides atomic test-and-set capability essential for multi-processor synchronization without software overhead.

Can the 70V25S55PF8 be used in industrial temperature applications?

No, the 70V25S55PF8 is rated for commercial temperature range only (0°C to +70°C). For industrial applications (−40°C to +85°C), IDT offers the 70V25L55PF8 variant (low-power version) or the 70V25S25PF8 (25 ns speed grade with industrial temp support). The 'S' suffix in 70V25S55PF8 explicitly denotes commercial-grade thermal specification per IDT ordering conventions.

What package type and dimensions does the 70V25S55PF8 use?

The 70V25S55PF8 uses a 100-pin Thin Quad Flatpack (TQFP) package designated PNG100, with body dimensions of 14 mm × 14 mm × 1.4 mm. It features gull-wing leads, 0.5 mm pitch, and RoHS-compliant green molding compound. This package is pin-compatible with other IDT70V25/24 devices in the same family, enabling design reuse across speed grades.