Renesas 70V27S35PF8

Overview

70V27S35PF8 from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 35ns maximum read cycle time (tRC), LVTTL-compatible I/O, and on-chip port arbitration logic for bus contention management in real-time interprocessor communication systems.

For engineers reviewing the 70V27S35PF8 datasheet, 70V27S35PF8 pinout, 70V27S35PF8 application, or 70V27S35PF8 equivalent, key selection considerations include its 100-pin TQFP package, industrial temperature range (–40°C to +85°C), BUSY/INT semaphore signaling support, and Master/Slave cascading capability for 32-bit+ data bus expansion without external logic.

Technical Context

The 70V27S35PF8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses - allowing concurrent reads/writes across ports without internal synchronization overhead. Its on-chip arbitration logic resolves address-contention conflicts via BUSY flag assertion (M/S = VIH) or BUSY input gating (M/S = VIL), with tBDD ≤ 40ns ensuring deterministic port-to-port data visibility timing.

It supports full hardware semaphore signaling using A0–A2 to select among eight flags, with dedicated SEM pins and non-tri-state totem-pole INT/BUSY outputs. The device uses separate upper-byte (UB) and lower-byte (LB) enables for flexible bus-width matching and operates from a single 3.3V ±0.3V supply with CMOS-level power-down control via CE0/CE1.

Key Specifications

Pinout & Package

70V27S35PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. All VDD pins require local decoupling; all VSS pins must be connected to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-35BVXI and AS7C33256PFSI-35, the 70V27S35PF8 uniquely integrates hardware semaphore and BUSY arbitration in a pin-compatible 100-pin TQFP, reducing BOM count and eliminating timing-critical software locks in real-time embedded systems.

Availability

70V27S35PF8 is available at Aetrix Electronics and suitable for industrial PLC communication modules, avionics data concentrators, medical imaging frame buffers, and automated test equipment requiring stable component supply and long-term industrial temperature support.

Supply support for 70V27S35PF8 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 IDT70V27 family was engineered specifically for deterministic interprocessor communication in real-time embedded systems, emphasizing hardware-accelerated arbitration, low-latency dual-port access, and seamless Master/Slave scalability.

FAQ

What is the maximum operating frequency supported by the 70V27S35PF8?

The 70V27S35PF8 supports a maximum read cycle time (tRC) of 35 ns, corresponding to an effective maximum operating frequency of approximately 28.6 MHz for continuous sequential access. This rating is guaranteed over the full industrial temperature range (–40°C to +85°C) and 3.3V ±0.3V supply, with timing validated using AC test conditions per the official IDT datasheet DSC3603.

Does the 70V27S35PF8 support true simultaneous read/write operations on both ports?

Yes, the 70V27S35PF8 features true dual-ported memory cells that allow independent, fully asynchronous read or write operations on the left and right ports simultaneously - including to the same memory location. When contention occurs, on-chip arbitration logic asserts the BUSY flag within 35 ns (tBAA) to prevent data corruption, as confirmed in Truth Table V and Timing Waveform 3603 drw 11.

How does the Master/Slave (M/S) pin affect BUSY functionality in the 70V27S35PF8?

When M/S = VIH, the 70V27S35PF8 operates as a Master: BUSYL and BUSYR are push-pull outputs that assert automatically during address-contention events. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that gate writes on the respective port - enabling daisy-chained arbitration in multi-device configurations, as defined in Note 1 of the Functional Block Diagram and Truth Table V.

Can the 70V27S35PF8 be used in a 32-bit data bus configuration?

Yes, the 70V27S35PF8 supports 32-bit expansion via its Master/Slave select (M/S) feature and dual chip-enable pairs (CE0L/CE1L and CE0R/CE1R). Cascading two devices - one configured as Master (M/S = VIH), the other as Slave (M/S = VIL) - enables full-speed 32-bit operation without external logic, as explicitly described in the "IDT MASTER/SLAVE Dual-Port RAM approach" section of the datasheet.

What are the voltage levels and drive strength specifications for the 70V27S35PF8 I/O pins?

The 70V27S35PF8 I/O pins are LVTTL-compatible with VOH ≥ 2.4 V (IOH = –4 mA) and VOL ≤ 0.4 V (IOL = 4 mA) under 3.3V ±0.3V supply conditions. Input thresholds are VIH ≥ 2.0 V and VIL ≤ 0.8 V, and output capacitance is specified at 10 pF (COUT), ensuring reliable interfacing with standard 3.3V logic families without external termination.