Renesas 70V27S20PFI8

Overview

70V27S20PFI8 from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 20 ns maximum read cycle time (tRC), 500 mW typical active power, and industrial temperature range (–40°C to +85°C). It serves as a stand-alone 512 Kbit memory or master/slave pair in 32-bit+ bus systems for real-time inter-processor communication.

For engineers reviewing the 70V27S20PFI8 datasheet, 70V27S20PFI8 pinout, 70V27S20PFI8 application, or 70V27S20PFI8 equivalent, key selection considerations include its LVTTL-compatible 3.3 V operation, on-chip semaphore arbitration, BUSY/INT flag support, and TQFP-100 packaging for embedded control and data coherency applications.

Technical Context

The 70V27S20PFI8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses-enabling concurrent read/write operations without external logic. Its on-chip port arbitration logic resolves contention via address-match or chip-enable timing, with BUSY outputs (push-pull) asserting when write conflicts occur.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2 addressing of eight shared flags, while full hardware interrupt generation is triggered by writes to fixed mailbox addresses (e.g., 7FFE_H for INTL). Power management uses TTL- and CMOS-level CE0/CE1 enables to achieve sub-1 mA full-standby current.

Key Specifications

Pinout & Package

70V27S20PFI8 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 VDD and VSS pins require local decoupling 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-20AC and R1EX24032AS0C-20#U0, the 70V27S20PFI8 uniquely integrates M/S-selectable cascading, hardware semaphores, and industrial temperature support in a single 100-pin TQFP - reducing BOM count and firmware development effort for real-time embedded systems.

Availability

70V27S20PFI8 is available at Aetrix Electronics and suitable for industrial motion control, redundant safety PLCs, and real-time inter-processor communication requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70V27S20PFI8 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70V27 family was engineered specifically for deterministic, low-latency inter-processor memory sharing in real-time embedded systems - emphasizing hardware arbitration, semaphore support, and industrial-grade reliability.

FAQ

What is the operating voltage range for the 70V27S20PFI8?

The 70V27S20PFI8 operates over a supply voltage range of 3.0 V to 3.6 V (3.3 V ± 0.3 V), compliant with LVTTL logic levels. This range ensures compatibility with standard 3.3 V system rails and eliminates need for voltage translation in mixed-signal designs. Operation outside this range may cause functional failure or accelerated wear.

Does the 70V27S20PFI8 support true simultaneous access to the same memory location?

Yes, the 70V27S20PFI8 features true dual-ported memory cells that allow independent, asynchronous reads or writes to the same address from left and right ports. When contention occurs, on-chip arbitration logic uses address-match or chip-enable timing to resolve access priority - ensuring data integrity without external logic.

How does the BUSY signal function in master vs. slave configuration on the 70V27S20PFI8?

When M/S = VIH, the 70V27S20PFI8 operates as a Master: BUSYL and BUSYR are push-pull outputs that assert LOW to block conflicting writes. When M/S = VIL, it operates as a Slave: BUSYL/BUSYR become inputs that internally inhibit writes when driven LOW - enabling hierarchical arbitration in multi-device systems.

What is the purpose of the SEM pins on the 70V27S20PFI8?

The SEML and SEMR pins enable hardware semaphore mode on the 70V27S20PFI8. When asserted, they activate eight dedicated semaphore flags addressed by A0–A2 and controlled via I/O0 - allowing atomic resource locking between ports without CPU involvement or software overhead.

Can the 70V27S20PFI8 be used in a 32-bit data bus configuration?

Yes, the 70V27S20PFI8 supports 32-bit expansion via Master/Slave cascading. One device is configured as Master (M/S = VIH), another as Slave (M/S = VIL); the BUSY output of the Master connects to BUSY input of the Slave, enabling coordinated access across two 16-bit devices without external logic.