Renesas 70V3579S6BC8

Overview

70V3579S6BC8 from IDT (now Renesas) 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 packet buffers, FPGA co-processor interfaces, and real-time video frame stores.

For engineers reviewing the 70V3579S6BC8 datasheet, 70V3579S6BC8 pinout, 70V3579S6BC8 application, or 70V3579S6BC8 equivalent, key selection criteria include pipelined latency timing, dual-port depth expansion capability via dual chip enables, byte-selectable 9-bit I/O control, industrial temperature support (-40°C to +85°C), and LVTTL-compatible 3.3 V core with selectable 2.5 V/3.3 V I/O interface.

Technical Context

The 70V3579S6BC8 implements full synchronous operation on both ports using edge-triggered registers for address, data, and all control signals-including R/W, CE0/CE1, BE0–BE3, ADS, CNTEN, and CNTRST-ensuring deterministic timing at 133 MHz. Its pipelined output mode introduces one-cycle latency between clock edge and valid data output, while self-timed write logic maintains fast cycle time without external wait-state generation.

Each port features independent OPT pins (OPTL/OPTR) that configure its VDDQ supply (3.3 V or 2.5 V), enabling mixed-voltage system interfacing-for example, left port at 2.5 V to an ASIC and right port at 3.3 V to an FPGA. The integrated address counter supports burst-mode sequential access with reset and enable control, decoupling address generation from external logic.

Key Specifications

Pinout & Package

70V3579S6BC8 is packaged 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 across left (L) and right (R) ports, supporting identical signal routing on both sides of the device.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and AS7C33256P-133JCIN, the 70V3579S6BC8 uniquely delivers per-port I/O voltage flexibility and guaranteed pipelined latency-enabling mixed-voltage integration and deterministic timing in high-throughput embedded systems without layout or logic redesign.

Availability

70V3579S6BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA-based accelerators, real-time video processing, and industrial motion control requiring stable component supply across extended product lifecycles.

Supply support for 70V3579S6BC8 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

Renesas Electronics (formerly IDT) is a global semiconductor leader specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The 70V3579S6BC8 belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency shared-memory applications in packet processing, video streaming, and real-time control systems.

FAQ

What is the maximum operating frequency of the 70V3579S6BC8?

The 70V3579S6BC8 supports a maximum clock frequency of 133 MHz, corresponding to a 7.5 ns clock cycle time. This is validated across commercial temperature range (0°C to +70°C) and confirmed in AC Electrical Characteristics Table 11 for the S6 speed grade. Operation at this rate requires adherence to specified setup/hold times (e.g., 1.8 ns address setup) and proper termination of clock and control lines.

Does the 70V3579S6BC8 support independent voltage selection for each port's I/O interface?

Yes, the 70V3579S6BC8 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 operation, while setting it to VIL (0 V) configures VDDQL for 2.5 V. The same applies to OPTR and VDDQR. This allows the left port to interface with a 2.5 V ASIC while the right port connects to a 3.3 V FPGA-all within a single 70V3579S6BC8 device.

What is the function of the ADSL and ADSR pins on the 70V3579S6BC8?

ADSL (Address Strobe Left) and ADSR (Address Strobe Right) are asynchronous address latch-enable inputs on the 70V3579S6BC8. When asserted low (VIL), they cause the corresponding port to load the current address bus value into its internal address register on the next rising clock edge-enabling external address generation independent of counter mode. This provides flexibility to switch between external addressing and internal counter-driven bursts without reconfiguring control logic.

How does the pipelined output mode affect data timing on the 70V3579S6BC8?

In pipelined mode, the 70V3579S6BC8 outputs data one clock cycle after the read command is registered-i.e., data valid appears at tCD2 (≤6 ns) after the rising edge that sampled R/W = HIGH and CE0/CE1 = ACTIVE. This deterministic 1-cycle latency simplifies timing analysis in synchronous systems but requires the read initiator to account for the pipeline stage when aligning data consumption. Non-pipelined alternatives would introduce variable or longer access delays.

Can the 70V3579S6BC8 be used in industrial temperature applications?

Yes, the 70V3579S6BC8 is qualified for industrial temperature operation from -40°C to +85°C. While the "S6" speed grade designation indicates commercial timing (6 ns tCD2), the device's electrical specifications-including DC current, AC timing parameters, and voltage thresholds-are validated across the full industrial range as documented in Tables 4, 9, and 11 of the datasheet. System designs must ensure thermal management complies with derating curves for sustained operation.