Renesas 70V3579S4BC8

Overview

70V3579S4BC8 from Integrated Device Technology is a high-speed 32K × 36-bit synchronous dual-port static RAM with pipelined output, true dual-port memory cells enabling simultaneous access to the same address, 4.2 ns max clock-to-data access (commercial grade), and 133 MHz operation at 7.5 ns cycle time. It supports independent 3.3 V or 2.5 V I/O interfaces per port and operates across industrial temperature range (–40°C to +85°C) in a 208-pin PQFP package.

For engineers reviewing the 70V3579S4BC8 datasheet, 70V3579S4BC8 pinout, 70V3579S4BC8 application, or 70V3579S4BC8 equivalent, this device is selected for high-bandwidth bidirectional data buffering in telecom line cards, real-time DSP co-processing systems, and FPGA-based protocol bridging where deterministic latency, depth expansion capability, and voltage-flexible I/O interfacing are critical.

Technical Context

The 70V3579S4BC8 implements full synchronous operation on both ports using edge-triggered registers for address, data, and all control inputs-including CE0/CE1, R/W, OE, BE0–BE3, ADS, CNTEN, and CNTRST-enabling precise timing control with minimal setup/hold requirements. Its pipelined output mode introduces one-cycle latency but guarantees deterministic tCD2 timing (4.2 ns max).

Each port features independent OPT pins and dedicated VDDQ rails, allowing mixed-voltage operation: left port at 3.3 V while right port runs at 2.5 V, or vice versa. The internal address counter-enabled via CNTEN and reset via CNTRST-supports burst-mode sequential access without external address generation logic.

Key Specifications

Pinout & Package

70V3579S4BC8 is housed in a 208-pin Plastic Quad Flatpack (PQFP) with 0.5 mm lead pitch and 28 mm × 28 mm body size. Pin functions are fully symmetric between left and right ports, with dedicated power/ground pairs per quadrant and separate VDDQL/VDDQR supplies routed to respective I/O banks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-167AXC and IDT70V3579S5BC8, the 70V3579S4BC8 uniquely balances commercial-grade speed (4.2 ns), industrial temperature support, PQFP package availability, and per-port I/O voltage selection-making it optimal for cost-sensitive, mixed-voltage, and rework-constrained designs.

Availability

70V3579S4BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and FPGA-based protocol bridging requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70V3579S4BC8 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, specializes in high-performance timing, memory interface, and RF solutions for communications and computing markets.

The 70V3579S4BC8 belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered for deterministic latency, mixed-voltage interoperability, and seamless integration into FPGA- and ASIC-based real-time data path architectures.

FAQ

What is the maximum operating frequency of the 70V3579S4BC8?

The 70V3579S4BC8 supports up to 133 MHz operation, corresponding to a 7.5 ns clock cycle time (tCYC2). This is validated under commercial temperature conditions (0°C to +70°C) with VDD = 3.3 V ±150 mV and proper termination. The device achieves 9.6 Gbps aggregate bandwidth across both ports at this rate.

Does the 70V3579S4BC8 support independent I/O voltage levels on each port?

Yes, the 70V3579S4BC8 supports independent 3.3 V or 2.5 V I/O operation per port via dedicated OPTL and OPTR pins. When OPTL = VIH, VDDQL must be 3.3 V; when OPTL = VIL, VDDQL must be 2.5 V-and similarly for the right port. This enables direct interfacing with mixed-voltage FPGAs and ASICs without external level shifters.

What package type is used for the 70V3579S4BC8?

The 70V3579S4BC8 is packaged in a 208-pin Plastic Quad Flatpack (PQFP) with 0.5 mm lead pitch and 28 mm × 28 mm body dimensions. This package provides mechanical robustness, ease of inspection, and compatibility with standard surface-mount assembly processes-unlike the BGA variants offered in the same family.

How does the address counter function in the 70V3579S4BC8?

The 70V3579S4BC8 includes an internal 15-bit address counter per port, controlled by CNTENL/CNTENR and CNTRSTL/CNTRSTR. When CNTEN = VIL on the rising clock edge, the counter advances automatically-eliminating need for external address sequencing logic. ADSL/ADSR can override counter output with external address, enabling hybrid burst/sequential access modes.

What is the significance of the 'S4' suffix in 70V3579S4BC8?

The 'S4' suffix in 70V3579S4BC8 denotes the commercial-grade speed bin: 4.2 ns maximum clock-to-data access time (tCD2) at 0°C to +70°C. It distinguishes this variant from S5 (5 ns, industrial temp qualified) and S6 (6 ns, commercial only). All share identical pinout, functionality, and package-only timing and temperature grading differ.