Renesas 70V25L20PFGI8

Overview

70V25L20PFGI8 from IDT (Integrated Device Technology) is a high-speed 4K x 16 true dual-port static RAM with independent left/right ports, 20 ns maximum access time, 3.3 V single-supply operation, and integrated semaphore arbitration logic - used in real-time inter-processor communication, video frame buffering, and FPGA co-processor memory interfaces.

For engineers reviewing the 70V25L20PFGI8 datasheet, 70V25L20PFGI8 pinout, 70V25L20PFGI8 application, or 70V25L20PFGI8 equivalent, key selection criteria include dual-port timing symmetry, industrial temperature support (–40°C to +85°C), low standby current (660 µA typ.), and TQFP-100 package compatibility for high-density PCB layouts.

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write operations to the same memory location without contention. On-chip arbitration resolves port conflicts via BUSY flag signaling and master/slave cascading capability.

It supports semaphore flag management across both ports using A0–A2 addressing and I/O0 for write, with full hardware semaphore logic eliminating external logic. The device operates exclusively at 3.3 V ±0.3 V and features TTL-compatible inputs and push-pull outputs for BUSY and INT signals.

Key Specifications

Pinout & Package

70V25L20PFGI8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VDD pins require local decoupling; all VSS pins must be solidly grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-20BGXI and AS7C34098B-20TIN, the 70V25L20PFGI8 uniquely integrates BUSY arbitration and semaphore logic - reducing BOM count and PCB area in tightly coupled multi-processor systems requiring deterministic inter-port coordination.

Availability

70V25L20PFGI8 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and real-time embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V25L20PFGI8 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 IDT70V25 family delivers high-speed dual-port SRAMs optimized for real-time inter-processor communication and FPGA co-processing - emphasizing deterministic timing, hardware arbitration, and industrial-grade reliability.

FAQ

What is the maximum operating frequency supported by the 70V25L20PFGI8?

The 70V25L20PFGI8 does not operate on a clock; it is an asynchronous SRAM. Its maximum effective throughput is determined by its 20 ns access time, supporting up to ~50 MHz random read/write cycles under ideal conditions. Real-world bandwidth depends on bus protocol overhead, but the device guarantees deterministic 20 ns latency for any address access - critical for hard real-time systems where jitter cannot be tolerated. This specification applies across the full industrial temperature range.

Does the 70V25L20PFGI8 support true simultaneous read/write to the same memory location?

Yes, the 70V25L20PFGI8 implements true dual-port SRAM cells that allow concurrent read and write operations to the identical memory address - one port reading while the other writes - without data corruption or bus contention. This behavior is inherent to the cell architecture and requires no configuration. The 70V25L20PFGI8 maintains data integrity even during simultaneous access, making it suitable for lock-free inter-processor communication protocols where deterministic timing is mandatory.

How is semaphore functionality implemented in the 70V25L20PFGI8?

The 70V25L20PFGI8 includes eight dedicated hardware semaphore flags accessed via A0–A2 address lines and controlled using the SEM enable pin. Writing to I/O0 updates the selected flag; reading returns the flag value across all I/O lines (I/O0–I/O15). This logic operates independently per port and resolves contention without software intervention. The 70V25L20PFGI8 uses this feature to coordinate resource access between processors - for example, ensuring exclusive access to shared peripherals or memory regions.

Can the 70V25L20PFGI8 be used in a master/slave configuration to expand data bus width?

Yes, the 70V25L20PFGI8 supports master/slave cascading via the M/S pin to construct wider memory systems - e.g., two devices yield a 4K × 32-bit configuration. When M/S = VIH, the device acts as master and outputs BUSY; when M/S = VIL, it acts as slave and accepts BUSY input. This eliminates external arbitration logic and ensures synchronized operation. The 70V25L20PFGI8's pinout and timing are designed for seamless daisy-chaining without additional glue logic or timing compensation.

What are the power consumption characteristics of the 70V25L20PFGI8 in active and standby modes?

The 70V25L20PFGI8 draws 400 mW (typ.) during active operation and only 660 µW (typ.) in full standby mode - achieved by asserting both CEL and CER high while maintaining CMOS-level inputs. This ultra-low standby current enables energy-efficient operation in always-on industrial controllers. Power-down sequencing is automatic: disabling CE per port reduces dynamic current proportionally, and the device meets industrial temp specs across the entire operating range without derating.