Renesas 70V38L15PFG

Overview

70V38L15PFG from Integrated Device Technology is a high-speed 3.3V 64K × 18 true dual-port static RAM with independent left/right ports, 15 ns max access time (commercial), LVTTL-compatible I/O, and on-chip semaphore/arbiration logic for multiprocessor synchronization. It enables simultaneous read/write to the same memory location in systems requiring deterministic inter-processor communication, such as real-time industrial controllers and telecom packet buffers.

For engineers reviewing the 70V38L15PFG datasheet, 70V38L15PFG pinout, 70V38L15PFG application, or 70V38L15PFG equivalent, key selection considerations include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S configuration, semaphore write-to-read latency (tSWRD = 5 ns), and compatibility with 3.3V LVTTL bus interfaces in master/slave cascaded memory architectures.

Technical Context

The 70V38L15PFG implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic uses push-pull BUSY outputs (not open-drain) and supports both master (M/S = VIH) and slave (M/S = VIL) modes - in master mode BUSY is an output indicating port contention; in slave mode it becomes a write-inhibit input.

Semaphore functionality resides in eight dedicated latches (addressed by A0–A2), accessible only when CE = VIH and SEM = VIL, with tSOP = 10 ns pulse width requirement and tSPS = 5 ns contention window. Interrupt flags (INTL/INTR) are triggered by writes to fixed addresses FFFE_H (left port sets right INTR) and FFFF_H (right port sets left INTL), with tINS/tINR ≤ 20 ns.

Key Specifications

Pinout & Package

70V38L15PFG 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 V_CC and GND pins must be connected per layout guidelines; package includes four GND and four V_CC 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 CY7C028V-15AXC and IDT70V27L15PF, the 70V38L15PFG uniquely delivers 64K × 18 density with on-die semaphores and configurable BUSY logic in a single 100-pin TQFP - eliminating board space for arbitration ICs and reducing firmware complexity in tightly synchronized multiprocessor systems.

Availability

70V38L15PFG is available at Aetrix Electronics and suitable for industrial motion controllers, telecom line card buffers, avionics display processors, and medical imaging pipelines requiring stable component supply, long-term lifecycle support, and guaranteed commercial-grade timing performance.

Supply support for 70V38L15PFG 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 high-performance computing and communications infrastructure.

The 70V38L15PFG belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration and low-latency memory sharing are critical.

FAQ

What is the maximum operating frequency supported by the 70V38L15PFG?

The 70V38L15PFG has a 15 ns maximum access time (tAA), corresponding to a theoretical maximum random-access frequency of 66.7 MHz per port. Sustained operation at this rate requires meeting all AC timing parameters including tRC = 15 ns, tACE = 15 ns, and proper bus settling - actual system clock rate depends on controller interface timing margins and PCB layout.

How does the BUSY signal behave when the 70V38L15PFG is configured as a slave?

When M/S = VIL (slave mode), BUSYL and BUSYR become level-sensitive write-inhibit inputs rather than outputs. A LOW on BUSYL blocks all writes to the left port; a LOW on BUSYR blocks all writes to the right port. This allows external arbitration logic to directly control write permission without relying on internal priority resolution.

Can the 70V38L15PFG be used in industrial temperature applications?

No - the 70V38L15PFG is rated for commercial temperature range only (0°C to +70°C). For industrial applications (–40°C to +85°C), the pin-compatible 70V38L20PFG variant must be selected, which has 20 ns access time and extended thermal qualification.

What is the purpose of the SEM pins on the 70V38L15PFG?

The SEML and SEMR pins enable access to the eight dedicated semaphore latches. When SEM = VIL and CE = VIH, the I/O pins map to semaphore flag storage (addressed by A0–A2); when SEM = VIH, the device operates as standard dual-port RAM. This separation prevents accidental overwrites of semaphore state during normal memory access.

How are interrupt flags generated and cleared in the 70V38L15PFG?

INTL is asserted when the right port writes to address FFFE_H; INTR is asserted when the left port writes to FFFF_H. INTL is cleared by the left port reading FFFE_H (CEL = OEL = VIL); INTR is cleared by the right port reading FFFF_H (CER = OER = VIL). Both flags are push-pull outputs with tINS/tINR ≤ 20 ns.