Renesas 70261L20PFGI8

Overview

70261L20PFGI8 from IDT (now Renesas) is a high-speed 16K × 16 true dual-port static RAM with interrupt and semaphore logic, operating at 20 ns max access time over industrial temperature (−40°C to +85°C), powered by single 5V ±10% supply, and packaged in 100-pin TQFP. It enables simultaneous asynchronous read/write access from independent left/right ports in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 70261L20PFGI8 datasheet, 70261L20PFGI8 pinout, 70261L20PFGI8 application, or 70261L20PFGI8 equivalent, key selection considerations include BUSY/INT flag timing, on-chip arbitration for contention resolution, byte-selectable I/O control, low 1 mW standby power, and master/slave cascading capability for 32-bit+ memory expansion.

Technical Context

The 70261L20PFGI8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional data buses per port. Its on-chip arbitration logic resolves simultaneous access to identical memory locations using BUSY flag assertion (M/S = H) or BUSY input synchronization (M/S = L), with tBDD ≤ 30 ns propagation delay for port-to-port write-read coordination.

It integrates dedicated interrupt registers at addresses 3FFE_H (left port INTL) and 3FFF_H (right port INTR), plus eight hardware semaphores addressed via A0–A2 and controlled by SEM pins, enabling lock-free resource sharing between heterogeneous processors without external logic.

Key Specifications

Pinout & Package

70261L20PFGI8 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 externally 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 CY7C028V-20AXC and AS7C31026B-20TIN, the 70261L20PFGI8 uniquely integrates hardware semaphore, interrupt mailbox, and master/slave arbitration-reducing BOM count by up to 3 discrete ICs and eliminating firmware complexity in multi-processor systems.

Availability

70261L20PFGI8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics flight control units, telecom baseband processors, and medical imaging data pipelines requiring stable component supply across extended product lifecycles.

Supply support for 70261L20PFGI8 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) designs high-performance memory and interface solutions for industrial, automotive, and communications infrastructure.

The IDT70261 product line delivers true dual-port SRAMs with integrated arbitration and inter-processor communication features specifically for real-time embedded systems requiring deterministic, hardware-accelerated memory sharing.

FAQ

What is the maximum operating temperature range for the 70261L20PFGI8?

The 70261L20PFGI8 is rated for industrial temperature operation from −40°C to +85°C, verified per manufacturer specifications and qualified for deployment in harsh environments such as factory automation controllers and outdoor telecom equipment. This range is explicitly defined in the "Maximum Operating Temperature and Supply Voltage" table of the official datasheet.

Does the 70261L20PFGI8 support true simultaneous access to the same memory location?

Yes, the 70261L20PFGI8 implements true dual-port memory cells that permit simultaneous read/write access to identical addresses. When contention occurs, on-chip arbitration logic asserts the BUSY flag to stall one port while allowing the other to complete, with tBDD ≤ 30 ns ensuring predictable resolution-confirmed in the BUSY TIMING section of the datasheet.

How does the interrupt functionality work in the 70261L20PFGI8?

The 70261L20PFGI8 uses fixed memory-mapped mailboxes: writing to address 3FFF_H on the left port sets the right port's INTR flag, and writing to 3FFE_H on the right port sets the left port's INTL flag. Clearing is performed by reading those same addresses. Timing is guaranteed with tINS ≤ 20 ns and tINR ≤ 20 ns, as specified in Table 15a.

What is the standby current consumption of the 70261L20PFGI8?

The 70261L20PFGI8 consumes 1 mW typical standby power (ISB3 ≤ 0.2 mA at full CMOS input levels), significantly lower than the IDT70261S variant (5 mW). This value is measured under ISB3 conditions (both ports disabled with all inputs at rail) and confirmed in Table 10 of the datasheet for the 'L' speed grade.

Can multiple 70261L20PFGI8 devices be cascaded for wider data paths?

Yes, the 70261L20PFGI8 supports master/slave cascading via the M/S pin: set M/S = H for master (BUSY output) and M/S = L for slave (BUSY input) to expand data width beyond 16 bits. This configuration enables error-free 32-bit or wider memory systems without external glue logic, as documented in the Functional Block Diagram and Pin Configuration sections.