Renesas 70V3579S5BFI8

Overview

70V3579S5BFI8 from Integrated Device Technology is a high-speed 32K × 36-bit synchronous dual-port static RAM with pipelined output, 5 ns max clock-to-data access (industrial grade), 7.5 ns cycle time (133 MHz), and independent 3.3 V or 2.5 V I/O voltage selection per port. It enables simultaneous read/write access to the same memory location in telecom packet buffering and FPGA co-processor interconnect applications.

For engineers reviewing the 70V3579S5BFI8 datasheet, 70V3579S5BFI8 pinout, 70V3579S5BFI8 application, or 70V3579S5BFI8 equivalent, key selection criteria include pipelined latency timing, dual-port counter enable/reset functionality, byte-selectable 9-bit-wide I/O groups, industrial temperature support (−40°C to +85°C), and PQFP-208 package compatibility with depth expansion logic.

Technical Context

The 70V3579S5BFI8 implements full synchronous operation on both ports using edge-triggered registers for address, data, and all control inputs-including CE0/CE1, R/W, OE, ADS, CNTEN, and CNTRST-enabling minimal setup (1.8 ns) and hold (0.7 ns) times at 133 MHz. Its true dual-port memory array allows concurrent access without arbitration logic.

It supports pipelined output mode with one-cycle data delay, self-timed write for fast cycle time, and independent address counters per port controlled by ADS and CNTEN signals. The OPTL/OPTR pins configure each port's I/O voltage (3.3 V or 2.5 V) independently while maintaining a fixed 3.3 V core supply (VDD).

Key Specifications

Pinout & Package

208-pin Plastic Quad Flatpack (PQFP), 28 mm × 28 mm × 3.5 mm body, 0.65 mm lead pitch. Pin 1 marked with dot; top-side marking includes "70V3579S5BFI8" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-100AXC and AS7C33256B-10JCN, the 70V3579S5BFI8 uniquely delivers 133 MHz operation with pipelined latency, per-port I/O voltage configurability, and integrated address counter-reducing external logic count and enabling tighter real-time determinism.

Availability

70V3579S5BFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and avionics data acquisition requiring stable component supply across extended product lifecycles.

Supply support for 70V3579S5BFI8 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 power management solutions for communications and computing markets.

The 70V3579S5BFI8 belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor and FPGA-ASIC bridging in mission-critical embedded systems.

FAQ

What is the maximum operating frequency of the 70V3579S5BFI8?

The 70V3579S5BFI8 supports a maximum clock frequency of 133 MHz, corresponding to a 7.5 ns clock cycle time (tCYC2). This is validated for industrial temperature range (−40°C to +85°C) and applies to both ports under full synchronous operation with pipelined output mode enabled.

Does the 70V3579S5BFI8 support independent I/O voltage levels on left and right ports?

Yes, the 70V3579S5BFI8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL to VIH (3.3 V) or VIL (0 V) configures VDDQL for 3.3 V or 2.5 V operation on the left port; OPTR performs the same function for the right port. The core VDD remains fixed at 3.3 V.

What is the purpose of the CNTEN and CNTRST pins on the 70V3579S5BFI8?

CNTENL/CNTENR enable automatic address increment on each rising clock edge, eliminating external address counters. CNTRSTL/CNTRSTR asynchronously reset the internal address counter to zero-used for buffer initialization or frame synchronization. Both functions operate independently per port and are unaffected by chip enable states.

How does the 70V3579S5BFI8 handle partial-word writes?

The 70V3579S5BFI8 uses four independent byte enable signals (BE0L–BE3L and BE0R–BE3R) to select 9-bit subwords for write operations. Each BE controls one 9-bit byte (I/O0–8, I/O9–17, I/O18–26, I/O27–35), allowing granular 9-bit, 18-bit, 27-bit, or full 36-bit writes without read-modify-write cycles.

Is the 70V3579S5BFI8 available in packages other than PQFP-208?

Yes, the 70V3579S5BFI8 is also offered in 208-pin fine-pitch BGA (BFG208) and 256-pin BGA (BCG256) packages. However, the 70V3579S5BFI8 variant specifically denotes the industrial-grade PQFP-208 package with 5 ns access time and −40°C to +85°C operation.