Renesas 70V261L55PF

Overview

70V261L55PF from IDT (now Renesas) is a high-speed, low-power 16K × 16 true dual-port static RAM with independent left/right ports, 55 ns max access time, 3.3 V single supply, and integrated BUSY arbitration, interrupt, and semaphore logic - used in real-time inter-processor communication systems such as telecom line cards and industrial motion controllers.

For engineers reviewing the 70V261L55PF datasheet, 70V261L55PF pinout, 70V261L55PF application, or 70V261L55PF equivalent, key selection criteria include dual-port contention handling (BUSY/SEM/INT), 100-pin TQFP package compatibility, industrial temperature support (−40°C to +85°C), and standby current of 660 µW - critical for power-sensitive embedded designs requiring deterministic inter-core synchronization.

Technical Context

The 70V261L55PF implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves simultaneous accesses to identical memory locations using hardware-driven BUSY flag assertion, with priority determined by chip enable and address match timing (tAPS = 5 ns).

It integrates three co-located synchronization primitives: eight dedicated semaphore registers (addressed via A0–A2), per-port interrupt flags (INTL/INTR triggered at fixed addresses 3FFEh/3FFFh), and master/slave configuration (M/S pin) enabling scalable width expansion without external logic - all operating under TTL-compatible 3.3 V ±0.3 V supply.

Key Specifications

Pinout & Package

70V261L55PF 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 performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-55AXI and AS7C3256B-55PCN, the 70V261L55PF uniquely integrates BUSY arbitration, interrupt flags, and semaphore registers in a single 100-pin TQFP - eliminating external glue logic and reducing BOM count in tightly coupled multi-processor systems.

Availability

70V261L55PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, medical imaging, and avionics applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature compliance.

Supply support for 70V261L55PF 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

Renesas Electronics (formerly Integrated Device Technology) is a global semiconductor leader specializing in high-performance memory, timing, and interface solutions for industrial, communications, and automotive markets.

The 70V261L55PF belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems where hardware synchronization primitives reduce software overhead and improve system reliability.

FAQ

What is the maximum access time specification for the 70V261L55PF?

The 70V261L55PF has a maximum address access time (tAA) of 55 ns under commercial temperature conditions (0°C to +70°C) and 3.3 V supply. This value is guaranteed across the full operating voltage range (3.0 V to 3.6 V) and applies to both left and right ports independently - ensuring predictable latency for time-critical inter-processor messaging in the 70V261L55PF.

How does the BUSY arbitration logic function in the 70V261L55PF?

The 70V261L55PF uses hardware-based BUSY arbitration triggered when both ports attempt access to the same memory location. In Master mode (M/S = VIH), BUSYL/BUSYR assert within 45 ns (tBAA) to stall the later port; in Slave mode (M/S = VIL), BUSY pins act as write-gate inputs. This logic is fully asynchronous and requires no clock - a core feature of the 70V261L55PF design.

Can the 70V261L55PF operate in industrial temperature range?

Yes, the 70V261L55PF is qualified for industrial temperature operation from −40°C to +85°C. This rating is explicitly confirmed in the datasheet's "Recommended DC Operating Conditions" table and applies to all speed grades including the 55 ns variant - making the 70V261L55PF suitable for harsh-environment applications like factory automation and outdoor telecom equipment.

What is the standby current consumption of the 70V261L55PF?

The 70V261L55PF draws 660 µW typical standby current (ISB3) when both ports are fully disabled with CMOS-level inputs (CE > VCC − 0.2 V). This ultra-low value reflects its optimized low-power design and is significantly lower than the 3.3 mW typical of the S-grade variant - a key differentiator of the 70V261L55PF for energy-sensitive deployments.

How are the interrupt flags (INTL/INTR) configured in the 70V261L55PF?

The 70V261L55PF interrupt flags are hardwired to specific addresses: INTL asserts when the right port writes to 3FFEh; INTR asserts when the left port writes to 3FFFh. Clearing is performed by reading the same address. These flags are push-pull outputs and require no external pull-ups - a built-in feature of the 70V261L55PF that simplifies interrupt routing to host processors.