Renesas 70V09L20PF

Overview

70V09L20PF from Integrated Device Technology is a high-speed 128K × 8 true dual-ported static RAM with independent left/right ports, 20 ns max access time (industrial grade), 3.3 V ±0.3 V single supply, and on-chip semaphore/INT/BUSY arbitration logic. It enables simultaneous asynchronous read/write to the same memory location in real-time interprocessor communication systems.

For engineers reviewing the 70V09L20PF datasheet, 70V09L20PF pinout, 70V09L20PF application, or 70V09L20PF equivalent, this device is selected for deterministic inter-CPU handshaking, mailbox-based messaging, hardware semaphore coordination, and low-latency shared-memory architectures requiring no external arbitration logic.

Technical Context

The 70V09L20PF implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its BUSY logic resolves contention via master/slave configuration (M/S pin), where BUSY is an output in master mode (VIH) and input in slave mode (VIL), with push-pull drive and no pull-up required.

It integrates eight dedicated semaphore latches (addressed by A0–A2) accessible via SEM = VIL and CE = VIH, enabling token-passing resource locking without software overhead. Interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (1FFFEh/1FFFFh), supporting event-driven interprocessor signaling.

Key Specifications

Pinout & Package

70V09L20PF 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; NC pins are no-connect and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C3128P-20JCIN, the 70V09L20PF uniquely delivers integrated hardware arbitration (BUSY/SEM/INT) in a true dual-port 8-bit architecture - reducing BOM count, PCB area, and firmware development effort for deterministic interprocessor communication.

Availability

70V09L20PF is available at Aetrix Electronics and suitable for industrial PLCs, avionics flight control units, and telecom baseband processors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V09L20PF 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 high-performance interconnect solutions for communications, computing, and industrial markets.

The 70V09L20PF belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency interprocessor communication in safety-critical and real-time embedded systems.

FAQ

What is the maximum operating temperature range for the 70V09L20PF?

The 70V09L20PF is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings and DC Operating Conditions tables of the official IDT datasheet DSC-4852/8, and applies to all speed grades including the 20 ns version. The device maintains full 20 ns access time performance across this entire range.

Does the 70V09L20PF support true simultaneous read/write to the same memory address?

Yes, the 70V09L20PF implements true dual-ported memory cells that permit simultaneous access to the same location. When contention occurs, its on-chip BUSY logic asserts the BUSY flag on the losing port to gate the write - preserving data integrity without external arbitration. This behavior is explicitly documented in the Functional Block Diagram and Truth Table V (Address BUSY Arbitration).

How are the semaphore flags accessed on the 70V09L20PF?

Semaphore flags are accessed by setting SEM = VIL and CE = VIH (per Truth Table III), then using A0–A2 to select one of eight latches. I/O0 writes the flag value; I/O0–I/O7 simultaneously read the current state. This dedicated semaphore bank is physically separate from the main 128K × 8 memory array and operates independently of normal memory access timing.

Can the 70V09L20PF be used in a master/slave configuration for memory expansion?

Yes - the M/S pin configures the 70V09L20PF as master (M/S = VIH, BUSY output) or slave (M/S = VIL, BUSY input). In master/slave arrays, the master resolves contention and drives BUSY to slaves, enabling scalable width expansion without external logic. This topology is detailed in the "Master/Slave Arrays" section of the datasheet (page 15).

What power-saving modes does the 70V09L20PF support?

The 70V09L20PF offers four standby modes: ISB1 (both ports TTL-inactive), ISB2 (one port active), ISB3 (full CMOS standby, 0.2 mA typ), and ISB4 (one port CMOS-standby). These are controlled by CE and input voltage thresholds, with ISB3 enabling ultra-low power (≤3 mA max) when all inputs are held near VCC or GND - ideal for intermittent wake-up architectures.