Renesas 70V27L20PFGI

Overview

70V27L20PFGI from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-port 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 control systems.

For engineers reviewing the 70V27L20PFGI datasheet, 70V27L20PFGI pinout, 70V27L20PFGI application, or 70V27L20PFGI equivalent, key selection criteria include port arbitration timing (tAPS = 5 ns), BUSY flag response under address-match contention (tBAA ≤ 20 ns), semaphore support for inter-processor synchronization, and LVTTL-compatible 3.3V ±0.3V single-supply operation.

Technical Context

The 70V27L20PFGI implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses. On-chip arbitration logic resolves port conflicts using either address-match detection (M/S = VIH) or chip-enable timing, with push-pull BUSY outputs and dedicated INTL/INTR flags.

It supports byte-selectable writes (UBL/LBL), semaphore flag access via A0–A2 addressing, and four standby modes-including ISB3 full standby at 0.2 mA-controlled by TTL- or CMOS-level CE inputs. All timing parameters are specified for VDD = 3.3V ±0.3V and industrial temperature range.

Key Specifications

Pinout & Package

70V27L20PFGI is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed thermal pad (per PN100-1 package drawing). All VDD pins require local 3.3V decoupling; all VSS pins must be solidly grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and R1EX24032ASAS-20#U0, the 70V27L20PFGI uniquely integrates full hardware arbitration, semaphore flags, and interrupt mailboxes - reducing BOM count and eliminating timing-critical firmware synchronization code in safety- or latency-sensitive designs.

Availability

70V27L20PFGI is available at Aetrix Electronics and suitable for industrial PLC backplanes, dual-core DSP buffers, avionics interfaces, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for 70V27L20PFGI 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, and RF power solutions for communications and computing infrastructure.

The IDT70V27 family was designed specifically for deterministic, low-latency shared memory in real-time embedded systems - emphasizing hardware arbitration, interrupt signaling, and seamless Master/Slave scalability without external logic.

FAQ

What is the maximum operating frequency supported by the 70V27L20PFGI?

The 70V27L20PFGI has a 20 ns maximum read cycle time (tRC), supporting reliable operation up to 50 MHz in synchronous bus environments. Its fully asynchronous design allows variable clock rates per port, with timing guaranteed across −40°C to +85°C and 3.3V ±0.3V supply. The 70V27L20PFGI does not require a system clock; timing is controlled solely by address and control signal transitions.

How does the 70V27L20PFGI handle simultaneous access to the same memory address?

The 70V27L20PFGI resolves simultaneous access via hardware arbitration: when M/S = VIH (Master), it asserts BUSY on the later-arriving port within 20 ns (tBAA) if addresses match. Priority is determined by tAPS (5 ns setup), ensuring deterministic resolution. As Slave (M/S = VIL), BUSY is an input that blocks writes until deasserted. The 70V27L20PFGI guarantees no data corruption during contention.

Can the 70V27L20PFGI be used in a 32-bit data path configuration?

Yes - the 70V27L20PFGI supports 32-bit expansion via Master/Slave cascading. Two devices are connected with M/S = VIH (Master) and M/S = VIL (Slave); BUSY outputs feed BUSY inputs, and CE0/CE1 signals are daisy-chained. This configuration maintains full 20 ns access speed across the combined 32-bit bus without external logic, as documented in the IDT70V27 functional description.

What is the purpose of the SEM pins on the 70V27L27L20PFGI?

The SEML and SEMR pins enable access to the internal 8-flag semaphore register. When SEM = VIL and CE = VIH, the device enters semaphore mode - allowing atomic read/write of flags addressed by A0–A2. This provides hardware-enforced mutual exclusion between processors, eliminating race conditions in shared-resource access. The 70V27L20PFGI supports semaphore contention detection (tSPS = 5 ns) and flag update (tSOP = 10 ns).

Does the 70V27L20PFGI support low-power modes for battery-operated systems?

Yes - the 70V27L20PFGI offers four standby modes. In ISB3 (full CMOS standby), current drops to 0.2 mA typical with all inputs at valid CMOS levels (VIL < 0.2 V or VIH > VDD − 0.2 V). This mode retains memory contents indefinitely and resumes operation in 0 ns (tPU = 0 ns). The 70V27L20PFGI's 660 µW typical standby power makes it suitable for energy-constrained edge nodes.