Renesas 70V28L20PFGI8

Overview

70V28L20PFGI8 from IDT (now Renesas) is a high-speed, 3.3V, 64K × 16 true dual-port static RAM with independent left/right ports, 20 ns max access time (industrial/commercial), on-chip semaphore logic, and hardware BUSY arbitration. It enables simultaneous read/write to the same memory location in real-time inter-processor communication systems.

For engineers reviewing the 70V28L20PFGI8 datasheet, 70V28L20PFGI8 pinout, 70V28L20PFGI8 application, or 70V28L20PFGI8 equivalent, key selection criteria include dual-port contention handling (BUSY/INT/SEM), LVTTL-compatible 3.3V operation, 100-pin TQFP packaging, industrial temperature support (–40°C to +85°C), and master/slave cascading for 32-bit+ bus expansion.

Technical Context

The 70V28L20PFGI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-no shared timing constraints between left and right sides. Its on-chip arbitration logic resolves simultaneous access via push-pull BUSY flags (not open-drain), while semaphore latches (8×, addressed by A0–A2) operate independently of the main 64K×16 memory array.

It supports three operational modes: standalone dual-port, master (BUSY output), or slave (BUSY input), selected by the M/S pin. Power management includes four standby current states (ISB1–ISB4), triggered by TTL- or CMOS-level chip enable inputs (CE0/CE1), enabling dynamic power gating per port without external logic.

Key Specifications

Pinout & Package

70V28L20PFGI8 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; NC pins are internally unconnected and must remain floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C364000B-20BIN, the 70V28L20PFGI8 uniquely delivers 3.3V-native dual-port operation with integrated semaphore and push-pull BUSY-enabling drop-in replacement in industrial and avionics designs where deterministic inter-processor coordination is mandatory.

Availability

70V28L20PFGI8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, real-time avionics data buffers, and medical imaging pipeline buffers requiring stable component supply across extended product lifecycles.

Supply support for 70V28L20PFGI8 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, specializes in high-performance timing, memory, and interface solutions for demanding real-time systems.

The 70V28L20PFGI8 belongs to IDT's high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in industrial automation, aerospace, and medical imaging applications.

FAQ

What is the maximum operating temperature range certified for the 70V28L20PFGI8?

70V28L20PFGI8 is rated for industrial temperature operation from –40°C to +85°C, with all AC/DC specifications guaranteed across this range. The PFGI8 suffix explicitly denotes industrial-grade qualification, including thermal cycling and long-term reliability testing per JESD22 standards.

Does the 70V28L20PFGI8 require external pull-up resistors on BUSY or INT pins?

No. The 70V28L20PFGI8 features push-pull (totem-pole) outputs on BUSYL, BUSYR, INTL, and INTR pins-no external pull-ups are needed. This eliminates BOM cost and layout uncertainty, unlike open-drain alternatives such as CY7C028V-20AXC.

How does the 70V28L20PFGI8 handle simultaneous write attempts to the same memory address?

When both ports attempt a write to the same address, the 70V28L20PFGI8 asserts BUSYL or BUSYR (depending on M/S configuration) within 20 ns, gating the write signal on the delayed port. The winning port completes its write; the stalled port resumes after BUSY deasserts-ensuring data integrity without external logic.

Can the 70V28L20PFGI8 be used in a 32-bit data path without external logic?

Yes. Using the MASTER/SLAVE cascading architecture, two 70V28L20PFGI8 devices can be configured-one as master, one as slave-with M/S and CE1 signals coordinating width expansion. This achieves full 32-bit operation with no glue logic, preserving 20 ns access timing end-to-end.

What memory locations are reserved for interrupt and semaphore functionality in the 70V28L20PFGI8?

The 70V28L20PFGI8 reserves address FFFEh to set/clear the left port interrupt (INTL) and FFFFh for the right port interrupt (INTR). Semaphore flags occupy eight dedicated locations addressed by A0–A2 (000b–111b) when SEM is active low-separate from the main 64K×16 array.