Renesas 70V261L25PFGI

Overview

70V261L25PFGI 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, industrial temperature range (−40°C to +85°C), and integrated semaphore/interrupt arbitration logic - used in real-time inter-processor communication systems requiring concurrent memory access without external logic.

For engineers reviewing the 70V261L25PFGI datasheet, 70V261L25PFGI pinout, 70V261L25PFGI application, or 70V261L25PFGI equivalent, key selection criteria include dual-port arbitration timing (tBAA ≤25 ns), ultra-low standby current (660 µW), 100-pin TQFP package compatibility, and master/slave cascading support for 32-bit+ bus expansion.

Technical Context

The 70V261L25PFGI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention via BUSY flag assertion based on chip enable and address match (tAPS = 5 ns setup), not R/W state.

It integrates eight hardware semaphores (addressed by A0–A2) accessible via dedicated SEM pin control (CE = VIH, SEM = VIL), and supports interrupt signaling using fixed mailbox addresses (3FFE_H/3FFF_H) with tINS ≤25 ns set time and tINR ≤30 ns reset time.

Key Specifications

Pinout & Package

70V261L25PFGI 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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-25BGXI and AS7C316098B-25TIN, the 70V261L25PFGI uniquely delivers industrial temperature rating, integrated semaphore registers, and interrupt mailboxes - reducing BOM count and firmware complexity in safety-critical dual-processor systems.

Availability

70V261L25PFGI is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line cards, avionics sensor hubs, and medical imaging subsystems requiring stable component supply across extended lifecycle programs.

Supply support for 70V261L25PFGI 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 timing, memory interface, and RF solutions, now part of Renesas Electronics.

The 70V261L25PFGI belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where concurrent memory access and hardware arbitration are critical.

FAQ

What is the maximum operating temperature range for the 70V261L25PFGI?

The 70V261L25PFGI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the DC Electrical Characteristics table (Table 05) and applies to all speed grades of the L-suffix variant. The 25 ns access time is guaranteed across this full range, making the 70V261L25PFGI suitable for harsh-environment applications such as factory automation and outdoor telecom equipment.

How does the BUSY arbitration logic function in the 70V261L25PFGI?

The 70V261L25PFGI's BUSY arbitration responds to address and chip enable matches between ports - not R/W state - with tAPS = 5 ns setup time. When configured as master (M/S = VIH), BUSYL/BUSYR assert within ≤25 ns (tBAA) if both ports access the same address simultaneously. The asserting port proceeds; the other is write-inhibited. In slave mode (M/S = VIL), BUSY pins become inputs that gate local writes, enabling cascaded arrays.

Does the 70V261L25PFGI support byte-selectable writes?

Yes, the 70V261L25PFGI supports independent upper- and lower-byte writes via UBL/UBR and LBL/LBR pins. When UBL = LBL = VIH, both bytes are deselected (power-down). With UBL = VIL and LBL = VIH, only I/O8–I/O15 are written; with UBL = VIH and LBL = VIL, only I/O0–I/O7 are written. This feature ensures compatibility with multiplexed 8-bit data buses and reduces unnecessary memory transitions.

What are the key differences between the 'S' and 'L' variants of the 70V261 family?

The 'S' variant (e.g., 70V261S25PFGI) has typical standby current of 3.3 mW, while the 'L' variant (70V261L25PFGI) achieves 660 µW - a 5× reduction - due to optimized CMOS design. Both share identical 25 ns access time, pinout, and feature set. The 'L' suffix denotes low-power optimization for battery-backed or thermally constrained systems, with no trade-off in speed or functionality.

Can the 70V261L25PFGI be used in a master/slave configuration for 32-bit data bus expansion?

Yes, the 70V261L25PFGI supports seamless 32-bit expansion using its M/S pin. One device is configured as master (M/S = VIH) to generate BUSY arbitration signals; others are slaves (M/S = VIL) that accept BUSY as write-inhibit inputs. Address and chip enable lines are shared across all devices, while data buses are interleaved (e.g., master handles I/O0–I/O15, slave handles I/O16–I/O31), enabling full-speed error-free operation without external glue logic.