Renesas 70V3579S4BF

Overview

70V3579S4BF from Integrated Device Technology is a high-speed 32K × 36-bit synchronous dual-port static RAM with pipelined output, 4.2 ns clock-to-data access (max), 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 switching fabric, network packet buffering, and real-time DSP co-processing systems.

For engineers reviewing the 70V3579S4BF datasheet, 70V3579S4BF pinout, 70V3579S4BF application, or 70V3579S4BF equivalent, this page delivers verified timing parameters, dual-port control logic behavior, industrial-grade (-40°C to +85°C) operation, package-specific pin mapping for BF208, and validated alternatives for depth expansion or voltage interface migration.

Technical Context

The 70V3579S4BF implements full synchronous operation on both ports using edge-triggered registers for address, data, byte enables, R/W, CE, OE, ADS, CNTEN, and CNTRST - all sampled on the rising edge of CLKL/CLKR. Its pipelined output mode introduces one-cycle latency, enabling deterministic 133 MHz throughput with 9.6 Gbps aggregate bandwidth.

Each port supports independent I/O voltage configuration via OPTL/OPTR pins, allowing 3.3 V or 2.5 V signaling without core voltage change (VDD remains fixed at 3.3 V). The internal address counter operates independently per port and is controlled by CNTEN/CNTRST with asynchronous ADS override - critical for burst-mode sequential access in FIFO emulation.

Key Specifications

Pinout & Package

70V3579S4BF is packaged in a 208-pin Plastic Quad Flatpack (PQFP), body size 28 mm × 28 mm × 3.5 mm, with 0.5 mm lead pitch. All VDD pins require 3.3 V supply; VDDQL/VDDQR must match OPTL/OPTR logic levels (3.3 V if VIH, 2.5 V if VIL).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-167BZXI and AS7C33256B-15JIN, the 70V3579S4BF uniquely delivers per-port I/O voltage selection, industrial temperature qualification, and pipelined 133 MHz operation in a 208-pin PQFP - making it the only option supporting mixed-voltage, high-reliability, deterministic dual-port buffering without layout or voltage-rail changes.

Availability

70V3579S4BF is available at Aetrix Electronics and suitable for telecom switching fabric, industrial motion control, and avionics data acquisition requiring stable component supply across extended lifecycle programs.

Supply support for 70V3579S4BF 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 70V3579S4BF belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency data exchange between independent clock domains in telecom infrastructure and real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V3579S4BF?

The 70V3579S4BF supports a maximum clock cycle time of 7.5 ns, corresponding to 133 MHz operation in pipelined mode. This is guaranteed across the commercial temperature range (0°C to +70°C) and confirmed in the AC Electrical Characteristics table (Table 11) of the official datasheet. The 70V3579S4BF achieves this with 4.2 ns clock-to-data access and 1.8 ns input setup time, enabling robust timing margin in high-speed designs.

Does the 70V3579S4BF support independent I/O voltage selection per port?

Yes, the 70V3579S4BF supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL to VIH (3.3 V) configures VDDQL for 3.3 V I/O operation on the left port; setting it to VIL (0 V) configures VDDQL for 2.5 V. The same applies to OPTR and VDDQR. This capability is explicitly documented in the Pin Configuration notes and Truth Table II, enabling mixed-voltage system integration without external level shifters.

What package type is used for the 70V3579S4BF?

The 70V3579S4BF is supplied in a 208-pin Plastic Quad Flatpack (PQFP) package, designated DRG208. Its mechanical dimensions are approximately 28 mm × 28 mm × 3.5 mm with 0.5 mm lead pitch. This package is distinct from the fpBGA and BGA variants (BF208, BC256) offered for other speed grades and temperature ranges - the "BF" suffix in 70V3579S4BF confirms the PQFP variant per IDT's ordering nomenclature.

How does the address counter function in the 70V3579S4BF?

The 70V3579S4BF implements an independent address counter per port, controlled by CNTENL/CNTENR and CNTRSTL/CNTRSTR. When CNTENX = VIL on the rising CLKX edge, the counter advances automatically - regardless of CE, BE, or R/W state. ADSX provides asynchronous address override. This behavior is defined in Truth Table II and illustrated in Timing Waveform drw 11, enabling efficient burst-mode sequential access without CPU/FPGA address increment logic.

Is the 70V3579S4BF qualified for industrial temperature operation?

Yes, the 70V3579S4BF is qualified for industrial temperature operation from -40°C to +85°C. This is explicitly stated in the Recommended Operating Conditions table (Table 4) and confirmed in the AC Electrical Characteristics table (Table 11), which lists "70V3579S5" (industrial grade) timing parameters alongside the "70V3579S4" (commercial) variant. The "S4BF" suffix denotes the commercial-speed, industrial-temperature qualified PQFP version.