Renesas 70V261L25PFG

Overview

70V261L25PFG from IDT is a high-speed 3.3V 16K × 16 true dual-port static RAM with independent left/right ports, 25 ns max access time, 660 µW standby current, and integrated semaphore/interrupt logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 70V261L25PFG datasheet, 70V261L25PFG pinout, 70V261L25PFG application, or 70V261L25PFG equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-temperature operation (–40°C to +85°C), and two rigorously cross-checked alternative parts for dual-port SRAM selection.

Technical Context

The 70V261L25PFG implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling simultaneous read/write to the same memory location without arbitration delay. It integrates on-chip hardware semaphore logic (8 flags, addressed via A0–A2) and interrupt flag generation (INTL/INTR) triggered by writes to dedicated mailbox addresses (3FFE_H/3FFF_H).

Port arbitration uses push-pull BUSY outputs (BUSYL/BUSYR) in MASTER mode (M/S = VIH) to stall conflicting accesses; in SLAVE mode (M/S = VIL), BUSY pins become write-inhibit inputs. CE-controlled power-down reduces active current to 100 mA typ. and full standby current to 0.2 mA typ. at 3.3 V.

Key Specifications

Pinout & Package

70V261L25PFG 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 connected per datasheet layout guidelines to ensure signal integrity and thermal stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-25BGXI and AS7C316000B-25JIN, the 70V261L25PFG uniquely delivers integrated semaphore registers, mailbox interrupts, and industrial temperature support in a single 100-pin TQFP package-reducing BOM count and eliminating timing-critical external arbitration logic.

Availability

70V261L25PFG is available at Aetrix Electronics and suitable for industrial motion control, telecom line card buffering, and avionics data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V261L25PFG 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) is a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The 70V261L25PFG belongs to IDT's high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems demanding sub-30 ns latency and hardware-enforced resource sharing.

FAQ

What is the maximum operating temperature range for the 70V261L25PFG?

The 70V261L25PFG is rated for industrial temperature operation from –40°C to +85°C. This specification is explicitly confirmed in the DC Operating Conditions table (Table 5) and applies to all speed grades of the L-suffix variant, including the 25 ns version. The device maintains full functionality-including 25 ns access time and 660 µW standby current-across this entire range.

Does the 70V261L25PFG support true simultaneous access to the same memory address?

Yes, the 70V261L25PFG implements true dual-port memory cells that permit simultaneous read/write operations to the exact same address location. This capability is explicitly stated in the Features section and enabled by dedicated read/write circuitry per port-no arbitration delay or software intervention is required for concurrent access.

How does the semaphore function work on the 70V261L25PFG?

The 70V261L25PFG includes eight hardware semaphore flags accessed via A0–A2 when SEM = VIL and CE = VIH. Writing "0" to I/O0 claims the flag; reading returns the flag state across all 16 I/O lines. This mechanism is documented in Truth Table II and Functional Description, enabling lock-free resource sharing between processors without CPU overhead.

What is the role of the M/S pin on the 70V261L25PFG?

The M/S pin configures the 70V261L25PFG as either MASTER (M/S = VIH) or SLAVE (M/S = VIL). In MASTER mode, BUSYL/BUSYR are push-pull outputs indicating port contention; in SLAVE mode, they become write-inhibit inputs. This enables scalable width expansion using one master and multiple slaves, as detailed in the Functional Description and Figure 3.

Is the 70V261L25PFG pin-compatible with other members of the 70V261 family?

Yes, all 70V261 variants-including 70V261S25PFG and 70V261L25PFG-share identical 100-pin TQFP pinout and footprint. Differences are limited to internal power optimization (L = low standby current) and temperature grade; electrical interface, timing, and functional behavior remain consistent across the family.