Renesas 70V261L25PFGI8

Overview

70V261L25PFGI8 from IDT (now Renesas) is a high-speed, 3.3V, 16K × 16 (256 Kbit) true dual-port static RAM with independent left/right ports, on-chip semaphore logic, interrupt flag support, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous read/write access to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 70V261L25PFGI8 datasheet, 70V261L25PFGI8 pinout, 70V261L25PFGI8 application, or 70V261L25PFGI8 equivalent, key selection criteria include its 25 ns max access time, 660 µW standby power, dual BUSY/INT signaling, full hardware semaphore arbitration, and TQFP-100 package compatibility with industrial-grade thermal and timing stability.

Technical Context

The 70V261L25PFGI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-no shared timing constraints between left and right sides. Its on-chip arbitration logic resolves contention via BUSY flag assertion based on chip enable and address match timing, not R/W state.

It integrates dedicated semaphore registers (8 flags, addressed by A0–A2), interrupt mailbox locations (3FFEh/3FFFh), and Master/Slave mode selection via M/S pin-enabling deterministic inter-processor synchronization without external logic. All I/Os are TTL-compatible with 3.3 V ±0.3 V supply.

Key Specifications

Pinout & Package

70V261L25PFGI8 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 VCC and GND pins must be properly decoupled per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-25BGXI and AS7C31026B-25JCIN, the 70V261L25PFGI8 delivers unique value through its integrated hardware semaphore engine, dual interrupt mailboxes, and industrial-grade BUSY arbitration-reducing BOM count, PCB area, and firmware complexity in safety-critical or real-time deterministic systems.

Availability

70V261L25PFGI8 is available at Aetrix Electronics and suitable for industrial motion control, telecom line card buffering, and medical imaging data pipelines requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.

Supply support for 70V261L25PFGI8 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

IDT (Integrated Device Technology), now part of Renesas Electronics, is a semiconductor leader specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V261L25PFGI8 belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems demanding hardware-enforced synchronization and zero-latency memory access.

FAQ

What is the maximum operating speed of the 70V261L25PFGI8?

The 70V261L25PFGI8 has a maximum access time of 25 ns, supporting up to 40 MHz effective read/write bandwidth per port under worst-case industrial temperature and voltage conditions. This is verified across –40°C to +85°C at VCC = 3.3 V ±0.3 V, with tAA, tACE, and tABE all specified at 25 ns max in the official Renesas datasheet revision 6.42.

Does the 70V261L25PFGI8 support true simultaneous access to the same memory address?

Yes, the 70V261L25PFGI8 implements true dual-port SRAM cells that allow simultaneous read/write or read/read operations to the exact same memory location. When contention occurs, its on-chip arbitration logic asserts BUSY to one port while permitting the other to proceed-ensuring deterministic behavior without data corruption in the 70V261L25PFGI8.

How does the semaphore functionality work in the 70V261L25PFGI8?

The 70V261L25PFGI8 provides eight dedicated binary semaphore flags accessed via A0–A2 when SEM = VIL and CE = VIH. Each flag is written using I/O0 and read across all 16 I/O lines. The hardware ensures atomic acquisition/release-no external logic or software intervention is needed to prevent race conditions in the 70V261L25PFGI8.

What is the role of the M/S pin in the 70V261L25PFGI8?

The M/S pin configures the 70V261L25PFGI8 as either Master (M/S = VIH) or Slave (M/S = VIL). In Master mode, BUSYL/BUSYR are push-pull outputs signaling port contention; in Slave mode, they become write-inhibit inputs. This enables seamless 32-bit+ bus expansion using one master and multiple slaves-all coordinated by the 70V261L25PFGI8's native architecture.

Can the 70V261L25PFGI8 operate with a single 3.3 V supply?

Yes, the 70V261L25PFGI8 operates exclusively from a single 3.3 V ±0.3 V supply (VCC). All I/Os are TTL-compatible, and internal circuitry is optimized for this voltage range. No auxiliary supplies, level shifters, or voltage regulators are required-simplifying power design and reducing bill-of-materials cost for the 70V261L25PFGI8.