Renesas 70V27L35PF8

Overview

IDT70V27L35PF8 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 from independent left and right ports, 35ns maximum read cycle time, 500mW typical active power, and 660μW typical standby power. It supports full on-chip semaphore signaling and busy arbitration for real-time inter-processor communication in embedded control systems.

For engineers reviewing the IDT70V27L35PF8 datasheet, IDT70V27L35PF8 pinout, IDT70V27L35PF8 application, or IDT70V27L35PF8 equivalent, key selection considerations include its 100-pin TQFP package, LVTTL-compatible 3.3V ±0.3V supply, industrial temperature range (–40°C to +85°C), and support for master/slave cascading in 32-bit memory systems without external logic.

Technical Context

The IDT70V27L35PF8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A14L/I/O0L–I/O15L/R/WL/CE0L/CE1L/OEL/UBL/LBL/SEML/INTL/BUSYL on left; mirrored on right), enabling concurrent read/write operations without contention when addresses differ. Its on-chip arbitration logic resolves port-to-port conflicts via BUSY flag assertion based on address match or chip enable timing.

It integrates hardware semaphore support using A0–A2 to select among eight flags, with dedicated SEM pins and non-tri-state totem-pole INT/BUSY outputs. The device enters low-power standby when CE0 and CE1 are high, with CMOS-level inputs enabling sub-milliwatt ISB3 current (0.2mA typ.) under full static conditions.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (PN100-1), 14 mm × 14 mm × 1.4 mm body, lead finish SnPb (EOL as of June 2018).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AC and R1EX24032AS0C-35, the IDT70V27L35PF8 uniquely delivers integrated M/S-selectable cascading and sub-milliwatt standby, making it optimal for cost-sensitive, power-constrained industrial controllers requiring scalable memory width.

Availability

IDT70V27L35PF8 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC memory modules, avionics data loggers, and medical imaging subsystems requiring stable component supply with long-term industrial lifecycle support.

Supply support for IDT70V27L35PF8 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70V27L35PF8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems with strict power and thermal constraints.

FAQ

What is the maximum operating frequency supported by the IDT70V27L35PF8?

The IDT70V27L35PF8 supports a maximum read cycle time of 35 ns, corresponding to a theoretical maximum operating frequency of approximately 28.6 MHz for continuous sequential access. This timing is guaranteed over the full industrial temperature range (–40°C to +85°C) and 3.3V ±0.3V supply, with actual system frequency dependent on address/control setup/hold requirements and board-level signal integrity.

Does the IDT70V27L35PF8 support true simultaneous access to the same memory location from both ports?

Yes, the IDT70V27L35PF8 implements true dual-ported memory cells that allow simultaneous read/write operations to the same address. When contention occurs, on-chip arbitration logic asserts the BUSY flag on the later-arriving port, blocking its write until the first operation completes - ensuring data coherency without external intervention.

How does the Master/Slave (M/S) pin function in the IDT70V27L35PF8?

When M/S = VIH, the IDT70V27L35PF8 operates as a Master: BUSYL and BUSYR are push-pull outputs used to coordinate with Slave devices. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that accept BUSY signals from a Master, enabling seamless 32-bit+ data bus expansion without discrete logic.

What is the purpose of the semaphore functionality in the IDT70V27L35PF8?

The IDT70V27L35PF8 includes eight hardware semaphore flags accessed via A0–A2 and I/O0. These flags provide atomic, hardware-enforced resource locking between processors - for example, allowing one CPU to claim exclusive access to a shared peripheral before the other can initiate a conflicting operation, eliminating race conditions in real-time systems.

Is the IDT70V27L35PF8 compatible with 5V logic interfaces?

No, the IDT70V27L35PF8 is strictly a 3.3V LVTTL-compatible device with VIH = 2.0V min and VIL = 0.8V max. Direct connection to 5V logic may damage the part. Level-shifting circuitry or voltage translators are required for interoperability with 5V systems, though its 3.3V I/O simplifies integration with modern FPGAs and ARM-based controllers.