Renesas 70V28L15PFI8

Overview

70V28L15PFI8 from Integrated Device Technology is a high-speed 3.3V 64K × 16 true dual-ported static RAM with independent left/right ports, 15 ns max access time (commercial grade), LVTTL-compatible I/O, and on-chip semaphore/arbiter logic for interprocessor communication in real-time embedded systems.

For engineers reviewing the 70V28L15PFI8 datasheet, 70V28L15PFI8 pinout, 70V28L15PFI8 application, or 70V28L15PFI8 equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-grade timing behavior, and real-world dual-processor memory coherency implementation guidance.

Technical Context

The 70V28L15PFI8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port-enabling simultaneous read/write to any memory location without internal arbitration delay. Its hardware BUSY flag logic resolves port-to-port contention via push-pull output with tBAA ≤ 15 ns and tBDD ≤ 15 ns.

On-chip semaphore signaling uses dedicated A0–A2-addressed latches (8 flags) accessed via SEM = VIL, CE = VIH, supporting token-passing resource locking without software overhead. Interrupt flags (INTL/INTR) are triggered by writes to FFFE_H (left) or FFFF_H (right), enabling mailbox-style interprocessor messaging.

Key Specifications

Pinout & Package

70V28L15PFI8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 14 mm × 14 mm body and 1.4 mm height. All VCC and GND pins must be connected per datasheet note; package code PNG100 applies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C364B-15JCIN, the 70V28L15PFI8 uniquely integrates arbitration, semaphore, and interrupt logic in a 3.3V-native package - eliminating external components and guaranteeing sub-15 ns deterministic response in safety-critical dual-processor systems.

Availability

70V28L15PFI8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, automotive ADAS sensor fusion modules, medical imaging pipelines, and avionics flight control systems requiring stable component supply across extended product lifecycles.

Supply support for 70V28L15PFI8 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

Integrated Device Technology (IDT), now part of Renesas Electronics, specializes in high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The 70V28L15PFI8 belongs to IDT's high-speed dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems demanding hardware-enforced memory coherency.

FAQ

What is the maximum operating frequency supported by the 70V28L15PFI8?

The 70V28L15PFI8 supports a maximum read cycle time (tRC) of 15 ns, enabling reliable operation at 66.7 MHz bus clocks in commercial temperature range. Its fully asynchronous design means no internal clock is required - timing is governed solely by address/control setup/hold and access parameters specified in the datasheet. The 70V28L15PFI8 achieves this performance using CMOS high-speed fabrication without compromising standby power.

How does the BUSY arbitration logic function in the 70V28L15PFI8?

The 70V28L15PFI8's BUSY logic asserts BUSYL or BUSYR when both ports attempt simultaneous access to the same memory address. In Master mode (M/S = VIH), BUSY is a push-pull output that gates the write signal on the contending port. The 70V28L15PFI8 guarantees tBAA ≤ 15 ns and tBDD ≤ 15 ns, ensuring deterministic resolution without external logic. In Slave mode (M/S = VIL), BUSY becomes an input that directly inhibits writes.

Can the 70V28L15PFI8 be used in 32-bit or wider memory systems?

Yes - the 70V28L15PFI8 supports 32-bit expansion via Master/Slave cascading. When multiple devices are connected, the M/S pin configures one as Master (BUSY output) and others as Slaves (BUSY input), enabling hardware-coordinated depth expansion. The 70V28L15PFI8's dual CE0/CE1 enables seamless stacking without external decode logic, and its separate UB/LB controls ensure byte alignment across wide buses.

What is the role of the SEM pin in the 70V28L15PFI8?

The SEM (Semaphore Enable) pin on the 70V28L15PFI8 selects between main memory and semaphore register access. When SEM = VIL and CE = VIH, the device routes A0–A2 to eight dedicated semaphore latches - allowing atomic token-passing operations independent of the 64K × 16 array. This enables lock-free resource sharing without consuming main memory space or requiring software polling. The 70V28L15PFI8's SEM logic is electrically isolated from memory array timing.

Does the 70V28L15PFI8 support industrial temperature operation?

Yes - the 70V28L15PFI8 is qualified for –40°C to +85°C operation per datasheet specification. While the "15" speed grade (15 ns access) is commercial-only, the 70V28L15PFI8 part number explicitly denotes industrial temperature screening (PFI8 suffix). Its DC characteristics, including ISB3 standby current (0.2 mA typ) and VIH/VIL thresholds, are guaranteed across the full industrial range without derating.