Renesas 70V27L20PFGI8

Overview

70V27L20PFGI8 from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-ported static RAM with true simultaneous access to the same memory location, 20 ns maximum read cycle time (tRC), 660 µW typical standby power, and industrial temperature range (–40°C to +85°C). It enables error-free 32-bit+ memory expansion via Master/Slave cascading in real-time embedded control systems.

For engineers reviewing the 70V27L20PFGI8 datasheet, 70V27L20PFGI8 pinout, 70V27L20PFGI8 application, or 70V27L20PFGI8 equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under address-match contention, semaphore support for inter-processor synchronization, and LVTTL-compatible 3.3V operation with no external logic required for depth or width expansion.

Technical Context

The 70V27L20PFGI8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port conflicts using either address-match detection (tBAA ≤ 20 ns) or chip-enable timing (tBAC ≤ 20 ns), with priority set-up time of 5 ns.

It supports semaphore signaling across ports via dedicated SEM pins and A0–A2-addressed flags, enabling hardware-level mutual exclusion. The device uses CMOS high-performance fabrication and features separate upper-byte (UB) and lower-byte (LB) controls for flexible bus matching in heterogeneous system designs.

Key Specifications

Pinout & Package

70V27L20PFGI8 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 pins require local 3.3 V decoupling; all VSS pins must be connected to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C3256A-20TIN, the 70V27L20PFGI8 uniquely delivers hardware-enforced memory coherency, sub-microwatt standby, and seamless 32-bit expansion - making it irreplaceable in deterministic multi-processor embedded systems.

Availability

70V27L20PFGI8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics data loggers, medical imaging subsystems, and real-time motor control requiring stable component supply across extended product lifecycles.

Supply support for 70V27L20PFGI8 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management solutions for communications, computing, and industrial markets.

The IDT70V27 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, semaphore support, and seamless bus-width scalability without external logic.

FAQ

What is the maximum operating frequency supported by the 70V27L20PFGI8?

The 70V27L20PFGI8 supports a maximum read cycle time (tRC) of 20 ns, corresponding to a theoretical 50 MHz sustained access rate. This assumes proper setup/hold timing compliance for address, CE, and OE signals under industrial temperature conditions (–40°C to +85°C) and 3.3 V ± 0.3 V supply. Actual system frequency depends on board layout, termination, and controller timing margins.

Does the 70V27L20PFGI8 support true simultaneous read-write operations on the same memory location?

Yes, the 70V27L20PFGI8 implements true dual-ported memory cells that permit simultaneous access - including concurrent read and write - to the exact same memory address. Conflict resolution is handled automatically via on-chip arbitration logic, with BUSY flag assertion and deterministic priority based on tAPS (5 ns setup time).

How does the Master/Slave (M/S) pin affect the BUSY signal behavior in the 70V27L20PFGI8?

When M/S = VIH, the 70V27L20PFGI8 operates as a Master: BUSYL and BUSYR are push-pull outputs that assert LOW to block writes during port contention. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that must be driven LOW by an external Master to inhibit writes - enabling hierarchical arbitration in multi-device systems.

Can the 70V27L20PFGI8 be used in a 32-bit data path configuration?

Yes, the 70V27L20PFGI8 supports 32-bit expansion via Master/Slave cascading. Two devices can be connected with M/S = VIH (Master) and M/S = VIL (Slave), using BUSY signaling to coordinate access. The IDT70V27 architecture eliminates need for external logic, enabling full-speed 32-bit word transfers without wait states or data corruption.

What is the purpose of the semaphore function in the 70V27L20PFGI8, and how is it implemented?

The semaphore function in the 70V27L20PFGI8 provides hardware-level mutual exclusion for shared resources. Eight flags are implemented using A0–A2 addressing and I/O0 for write; all 16 I/O lines reflect the flag value on read. SEM pins enable/disable semaphore access independently per port, allowing atomic test-and-set operations without software intervention or race conditions.