Renesas 70V27S20PF8

Overview

70V27S20PF8 from Integrated Device Technology is a high-speed 32K × 16 dual-port static RAM with true independent left/right port access, 20 ns maximum read cycle time (tRC), 3.3 V ±0.3 V single-supply operation, and on-chip semaphore/arbiration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 70V27S20PF8 datasheet, 70V27S20PF8 pinout, 70V27S20PF8 application, or 70V27S20PF8 equivalent, this page delivers verified timing specs, master/slave BUSY arbitration behavior, byte-select control, LVTTL-compatible I/O, and industrial-grade (-40°C to +85°C) TQFP packaging details critical for deterministic multi-CPU memory sharing designs.

Technical Context

The 70V27S20PF8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional data buses per port-enabling simultaneous non-contention reads/writes to identical memory locations. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion based on address match or chip-enable timing, with priority set-up time (tAPS) of 5 ns.

It supports MASTER/SLAVE cascading for 32-bit+ bus expansion using M/S pin configuration, where BUSY acts as output (VIH) in Master mode and input (VIL) in Slave mode. Semaphore signaling uses A0–A2 addressing to manage eight shared flags across both ports with tSWRD ≤5 ns write-to-read latency.

Key Specifications

Pinout & Package

70V27S20PF8 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 VDD pins require local decoupling; all VSS pins must be solidly grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and IDT70V36S25PFI, the 70V27S20PF8 uniquely balances 20 ns speed, integrated semaphore arbitration, and industrial temperature support in a mature, production-proven 100-pin TQFP package-making it optimal for cost-constrained, latency-critical embedded control systems requiring hardware-enforced coherency.

Availability

70V27S20PF8 is available at Aetrix Electronics and suitable for real-time multi-processor communication, digital signal processing buffering, industrial PLC redundancy handshake, and avionics flight control data exchange requiring stable component supply across long-life industrial programs.

Supply support for 70V27S20PF8 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 signal conditioning ICs for high-performance computing and communications infrastructure.

The IDT70V27S series was designed specifically for deterministic inter-processor communication in safety-critical embedded systems-delivering hardware-accelerated arbitration, semaphore, and interrupt features to replace software-managed shared memory bottlenecks.

FAQ

What is the maximum operating frequency supported by the 70V27S20PF8?

The 70V27S20PF8 does not operate at a fixed clock frequency-it is an asynchronous SRAM. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 20 ns, enabling effective throughput up to 50 MHz in tightly controlled systems. Actual system bandwidth depends on address/control setup/hold times and bus protocol overhead-not a synchronous clock domain.

Does the 70V27S20PF8 support independent power-down of each port?

Yes. The 70V27S20PF8 supports per-port power management via CE0 and CE1 enables. When CE0L and CE1L are both high, the left port enters standby (ISB1 mode, 44 mA typ.); similarly, CE0R/CE1R control right-port standby. Full standby (ISB3) draws only 0.2 mA typ. when all inputs are CMOS-leveled.

How does the BUSY arbitration logic function in Master vs. Slave configuration for the 70V27S20PF8?

In Master mode (M/S = VIH), BUSYL/BUSYR are push-pull outputs that assert low when port contention is detected-blocking writes on the contending port. In Slave mode (M/S = VIL), BUSYL/BUSYR become inputs; a low signal from the Master inhibits writes internally. This enables hierarchical arbitration in multi-device systems without external logic.

Can the 70V27S20PF8 be used in a 32-bit data bus configuration?

Yes. The 70V27S20PF8 supports 32-bit expansion via MASTER/SLAVE cascading: one device configured as Master (M/S = VIH) drives BUSY outputs, while others as Slaves (M/S = VIL) accept BUSY inputs. Two devices provide 32-bit width; additional devices scale further-no external logic required per the IDT70V27 architecture.

What are the valid interrupt address locations for the 70V27S20PF8?

The 70V27S20PF8 uses fixed mailbox addresses for interrupt control: writing to address 7FFEh (hex) on the right port sets the left-port INTL flag; writing to 7FFFh sets the right-port INTR flag. Conversely, reading those addresses clears the respective flags-enabling hardware-synchronized event signaling between processors.