Renesas 70V27S55PF8

Overview

IDT70V27S55PF8 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, 55 ns maximum read cycle time (commercial grade), LVTTL-compatible I/O, and on-chip port arbitration logic - deployed in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the IDT70V27S55PF8 datasheet, IDT70V27S55PF8 pinout, IDT70V27S55PF8 application, or IDT70V27S55PF8 equivalent, key selection considerations include bus-matching byte enables (UBL/LBL), master/slave semaphore signaling, BUSY flag arbitration timing (tBDD ≤ 50 ns), and industrial-grade TQFP packaging for ruggedized control subsystems.

Technical Context

The IDT70V27S55PF8 implements fully asynchronous dual-port architecture with independent left/right address, control, and 16-bit bidirectional I/O buses. Its on-chip arbitration logic resolves contention via address-match or chip-enable priority, with push-pull BUSY outputs (not tri-state) and dedicated semaphore registers addressed by A0–A2.

It supports MASTER/SLAVE cascading for 32-bit+ data width expansion using M/S pin configuration, where M/S = VIH enables BUSY output (Master) and M/S = VIL configures BUSY as input (Slave). Semaphore flags are written via I/O0 and read across all 16 I/O lines, with tSWRD ≤ 5 ns and tSPS ≤ 5 ns for low-latency interlock coordination.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead finish SnPb (EOL per June 2018).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and R1EX24032AS0A0I#U0, the IDT70V27S55PF8 uniquely integrates full on-chip arbitration (BUSY, INT, SEM), byte-select controls, and M/S cascading - reducing BOM count and PCB area in tightly coupled dual-processor systems.

Availability

IDT70V27S55PF8 is available at Aetrix Electronics and suitable for industrial automation, avionics data concentrators, and real-time signal processing bridges requiring stable component supply and long-term obsolescence mitigation.

Supply support for IDT70V27S55PF8 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 IDT70V27S55PF8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems with strict latency and reliability requirements.

FAQ

What is the operating temperature range for IDT70V27S55PF8?

IDT70V27S55PF8 is specified for commercial temperature range: 0°C to +70°C. While the IDT70V27L variant supports industrial range (–40°C to +85°C), the 'S' suffix in IDT70V27S55PF8 confirms its commercial-grade qualification per datasheet DSC 3603/17. Thermal derating is not supported beyond this range.

Does IDT70V27S55PF8 support true simultaneous read/write to the same address?

Yes, IDT70V27S55PF8 features true dual-ported memory cells that permit simultaneous access - including concurrent read and write - to the exact same memory location. This capability is implemented at the silicon level and requires no external arbitration logic, as confirmed in the Functional Block Diagram and Features section of the datasheet.

How does the BUSY arbitration work on IDT70V27S55PF8?

IDT70V27S55PF8 implements two BUSY arbitration modes: address-match (tBAA/tBDA) and chip-enable timing (tBAC/tBDC). When configured as Master (M/S = VIH), BUSY outputs assert to block conflicting writes; as Slave (M/S = VIL), BUSY inputs inhibit writes. All BUSY signals are push-pull, not open-drain, per Note 2 in the Pin Configuration diagram.

Can IDT70V27S55PF8 be used in a 32-bit data path configuration?

Yes, IDT70V27S55PF8 supports 32-bit expansion via MASTER/SLAVE cascading. When multiple devices are connected, the M/S pin selects Master (BUSY output) or Slave (BUSY input), enabling synchronized operation without external logic. The datasheet explicitly states "IDT70V27 easily expands data bus width to 32 bits or more" using this method.

What is the meaning of '55' in IDT70V27S55PF8?

The '55' in IDT70V27S55PF8 denotes the maximum access time specification: 55 ns. This applies to parameters including tAA (Address Access Time), tACE (Chip Enable Access Time), and tABE (Byte Enable Access Time), all guaranteed ≤ 55 ns under commercial conditions (VDD = 3.3 V, TA = 0°C to +70°C), as shown in Table 12b of the datasheet.