Renesas 70V38L20PFGI

Overview

70V38L20PFGI from Integrated Device Technology (IDT) is a high-speed, 3.3V, 64K × 18 true dual-port static RAM with independent left/right ports, 20 ns max access time (industrial grade), LVTTL-compatible I/O, and on-chip semaphore/arbiter logic for inter-processor synchronization in real-time embedded systems.

For engineers reviewing the 70V38L20PFGI datasheet, 70V38L20PFGI pinout, 70V38L20PFGI application, or 70V38L20PFGI equivalent, this device supports simultaneous asynchronous read/write to shared memory locations, hardware BUSY arbitration, interrupt flag signaling, and master/slave cascading for 36-bit+ data width expansion - all critical for deterministic multi-CPU communication in industrial control and telecom infrastructure.

Technical Context

The 70V38L20PFGI implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention via push-pull BUSY flags (BUSYL/BUSYR), while semaphore latches (8 flags, addressed by A0–A2) enable token-passing resource locking without software overhead.

It supports three operational modes: standalone dual-port RAM, master/slave cascaded configuration (via M/S pin), and semaphore-only access (CE = VIH, SEM = VIL). All timing parameters - including tAA (20 ns), tBDD (17 ns), and tSOP (10 ns) - are specified over –40°C to +85°C at VCC = 3.3V ±0.3V.

Key Specifications

Pinout & Package

70V38L20PFGI 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 layout guidelines; package includes four GND and four VCC pins for noise suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1372KV18-200BZC and AS7C362000B-20TIN, the 70V38L20PFGI uniquely integrates BUSY arbitration, semaphore latches, and interrupt flags in a single 100-pin TQFP - delivering deterministic, hardware-accelerated inter-processor communication without external logic or software overhead.

Availability

70V38L20PFGI is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom baseband processors, avionics flight management units, and medical imaging data buffers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V38L20PFGI 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 sensor solutions for communications, computing, and industrial markets.

The 70V38L20PFGI belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in safety-critical and real-time embedded systems.

FAQ

What is the maximum operating temperature range for the 70V38L20PFGI?

The 70V38L20PFGI is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC electrical parameters in the datasheet, including 20 ns access time, BUSY timing (tBDD ≤ 17 ns), and full standby current (ISB3 ≤ 3.0 mA), making it suitable for harsh-environment applications like factory automation and outdoor telecom equipment.

Does the 70V38L20PFGI support true simultaneous read/write to the same memory location?

Yes, the 70V38L20PFGI implements true dual-port SRAM cells that allow independent, asynchronous access to any memory location from both ports. However, when both ports attempt to write to the same address, the on-chip BUSY logic asserts BUSYL or BUSYR to stall the later-accessing port - preserving data integrity without requiring external arbitration logic.

How does the semaphore function work on the 70V38L20PFGI?

The 70V38L20PFGI includes eight dedicated hardware semaphore latches, accessed via A0–A2 when SEM = VIL and CE = VIH. Each latch can be written via I/O0 and read across all 18 I/O lines. The latches operate independently of the main RAM array and enable atomic "token-passing" resource locking between processors - eliminating race conditions without software mutexes or polling loops.

Can the 70V38L20PFGI be used in a master/slave configuration for wider data buses?

Yes, the 70V38L20PFGI supports master/slave cascading via the M/S pin: when M/S = VIH, BUSYL/BUSYR act as push-pull outputs for arbitration; when M/S = VIL, they become inputs for slave devices. Multiple 70V38L20PFGI devices can be stacked to build 36-bit or wider memory systems with full-speed, error-free operation and no external glue logic.

What are the power consumption characteristics of the 70V38L20PFGI in standby mode?

In full standby mode (both ports disabled with CMOS-level inputs), the 70V38L20PFGI draws only 0.2 mA typical (3.0 mA max) at VCC = 3.3V. This ultra-low ISB3 current is achieved by internally disabling all circuitry except bias networks, enabling energy-efficient operation in battery-backed or always-on embedded systems where power budget is constrained.