Renesas 70261L25PF8

Overview

70261L25PF8 from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with interrupt and semaphore support, operating at 25 ns max access time across industrial temperature range (−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-used in real-time interprocessor communication, video frame buffers, and military avionics data exchange.

For engineers reviewing the 70261L25PF8 datasheet, 70261L25PF8 pinout, 70261L25PF8 application, or 70261L25PF8 equivalent, key selection considerations include BUSY/INT flag timing (tINS/tINR ≤ 20 ns), dual-port arbitration latency (tBDD ≤ 30 ns), low standby power (ISB3 = 0.2 mA typ.), and master/slave cascading capability for 32-bit+ bus expansion.

Technical Context

The 70261L25PF8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent memory access without external arbitration logic. Its on-chip arbitration uses push-pull BUSY flags (not open-drain) and supports both address-match and CE-controlled arbitration modes with tAPS = 5 ns priority setup.

It integrates eight hardware semaphores addressed via A0–A2, accessed only when CE = VIH and SEM = VIL, and provides interrupt signaling via dedicated mailbox addresses (3FFE_H for INTL, 3FFF_H for INTR), with interrupt set/reset times ≤ 20 ns and full port-to-port write-read delay (tDDD) ≤ 35 ns.

Key Specifications

Pinout & Package

70261L25PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with exposed thermal pad (Pb-free, RoHS-compliant). All 100 pins are assigned; no NC pins affect routing. Pin 1 is top-left corner (marked dot), with left-port signals on top/bottom edges and right-port signals on left/right edges as per standard pinout diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-25ZXI and IDT70V261S25PF8, the 70261L25PF8 uniquely delivers integrated semaphore arbitration, interrupt mailbox addressing, and industrial temperature support in a single 5V-compatible package-enabling simpler, more robust interprocessor designs without external glue logic or voltage translation.

Availability

70261L25PF8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, video frame buffering, and industrial PLC redundancy modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70261L25PF8 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 fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70261 family was designed specifically for deterministic, low-latency interprocessor communication in safety-critical and real-time embedded systems-emphasizing hardware arbitration, interrupt signaling, and seamless master/slave scalability.

FAQ

What is the maximum operating temperature specification for the 70261L25PF8?

The 70261L25PF8 is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the "Maximum Operating Temperature and Supply Voltage" table (page 3) and DC Electrical Characteristics tables (pages 5–6), where all ISB and ICC parameters are explicitly tested across this full range. The 'L' suffix denotes the low-power industrial variant.

Does the 70261L25PF8 support true simultaneous access to the same memory location from both ports?

Yes, the 70261L25PF8 implements true dual-ported memory cells that allow simultaneous read/write access to the same address. When contention occurs, on-chip arbitration asserts BUSY on the later-arriving port (per tAPS = 5 ns setup), allowing the first port to complete its operation unimpeded-ensuring deterministic behavior without external logic.

How does the interrupt functionality work in the 70261L25PF8?

The 70261L25PF8 uses dedicated mailbox addresses: writing to 3FFF_H on the left port sets INTR (right-port interrupt), and writing to 3FFE_H on the right port sets INTL (left-port interrupt). Clearing is performed by reading those same addresses. Timing is guaranteed with tINS/tINR ≤ 20 ns, as specified in Table 15a.

What is the standby current consumption of the 70261L25PF8 under full CMOS input conditions?

Under full standby conditions-where both CEL and CER are held > VCC − 0.2 V, all inputs are at rail (VIN > VCC − 0.2 V or VIN < 0.2 V), and SEMR/SEML are high-the 70261L25PF8 draws only 0.2 mA typical (ISB3), as documented in Table 10 (page 5). This ultra-low quiescent current enables energy-efficient idle states.

Can multiple 70261L25PF8 devices be cascaded to form a 32-bit or wider data bus?

Yes, the 70261L25PF8 supports master/slave cascading via the M/S pin. When configured as MASTER (M/S = H), BUSY is an output; as SLAVE (M/S = L), BUSY is an input used to inhibit writes. This enables seamless expansion to 32-bit+ word widths without additional discrete logic, as described in the Features section (page 1) and Functional Block Diagram.