Renesas 70261L15PFG8

Overview

70261L15PFG8 from IDT (now Renesas) is a high-speed 16K × 16 true dual-port static RAM with interrupt and semaphore support, operating at 15 ns max access time (commercial grade), 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It features independent left/right ports, on-chip arbitration logic, and push-pull BUSY/INT flags-used in real-time interprocessor communication, video frame buffers, and military avionics data exchange.

For engineers reviewing the 70261L15PFG8 datasheet, 70261L15PFG8 pinout, 70261L15PFG8 application, or 70261L15PFG8 equivalent, key selection criteria include dual-port contention resolution timing (tBDD ≤ 18 ns), low standby power (1 mW typ.), TTL-compatible I/O, 100-pin TQFP package, and hardware semaphore flag management across eight shared resources.

Technical Context

The 70261L15PFG8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves simultaneous accesses to identical memory locations using BUSY flag assertion (M/S = H for master output; M/S = L for slave input) and priority setup timing (tAPS = 5 ns).

It supports semaphore signaling via dedicated SEM pins and A0–A2 address decoding for eight flags, with write-to-read propagation delay tSWRD = 5 ns. Interrupt functionality uses fixed mailbox addresses (3FFE_H for INTL, 3FFF_H for INTR), triggered by cross-port writes under CE/SEM-controlled conditions.

Key Specifications

Pinout & Package

70261L15PFG8 is housed in a 100-pin TQFP (Pb-free, RoHS-compliant) 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 CY7C1362AV25 and 70V27L15PF, the 70261L15PFG8 uniquely delivers 5 V TTL compatibility, sub-20 ns interrupt latency, and integrated mailbox addressing-making it optimal for legacy industrial and defense systems requiring zero-software arbitration.

Availability

70261L15PFG8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, video frame buffering, and military avionics data exchange requiring stable component supply across extended product lifecycles.

Supply support for 70261L15PFG8 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 memory, timing, and interface solutions for communications and computing markets.

The IDT70261 family was designed specifically for deterministic, low-latency interprocessor communication in dual-CPU architectures-emphasizing hardware arbitration, interrupt mailboxes, and seamless 32-bit bus expansion.

FAQ

What is the maximum operating temperature range for the 70261L15PFG8?

The 70261L15PFG8 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 (page 5) of the official datasheet. The device maintains full 15 ns access time performance across this range, making it suitable for harsh-environment applications like motor drives and avionics. Thermal derating is not required within these limits.

Does the 70261L15PFG8 support true simultaneous read/write to the same memory address?

Yes, the 70261L15PFG8 implements true dual-port memory cells that allow simultaneous access to the same location. When contention occurs, on-chip arbitration logic asserts the BUSY flag (tBAA ≤ 15 ns) to stall one port while permitting the other to proceed. This behavior is documented in the Functional Block Diagram (page 1), Truth Table IV (page 15), and Timing Waveform of Write with Port-to-Port Read (page 12). No external logic is needed.

How does the interrupt functionality work on the 70261L15PFG8?

The 70261L15PFG8 uses fixed SRAM addresses 3FFE_H (for INTL) and 3FFF_H (for INTR) as interrupt mailboxes. Writing to 3FFF_H from the left port asserts INTR; reading 3FFF_H from the right port clears it. Similarly, 3FFE_H controls INTL. This is defined in Truth Table III (page 14) and Functional Description (page 15). The 70261L15PFG8 guarantees tINS ≤ 15 ns interrupt set time under commercial conditions.

What is the standby power consumption of the 70261L15PFG8?

The 70261L15PFG8 consumes 1 mW typical standby power (ISB3, both ports fully disabled with CMOS-level inputs), as specified in Table 10 (page 5) of the datasheet. This is half the standby power of the IDT70261S variant (5 mW) and reflects its "L" (low-power) designation. The value is measured at VCC = 5.0 V, TA = +25°C, with all inputs held static at valid logic levels.

Can the 70261L15PFG8 be used in MASTER/SLAVE configurations for 32-bit bus expansion?

Yes, the 70261L15PFG8 supports MASTER/SLAVE cascading via the M/S pin to expand data bus width beyond 16 bits. When configured as MASTER (M/S = H), BUSY is an output; as SLAVE (M/S = L), BUSY is an input that inhibits writes during contention. This is detailed in the Features section (page 1), Pin Names table (page 2), and Functional Description (page 15). The 70261L15PFG8 enables full-speed, error-free 32-bit operation without external glue logic.