Renesas 70V3579S5BCI

Overview

70V3579S5BCI 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 switching fabric and real-time DSP co-processing systems.

For engineers reviewing the 70V3579S5BCI datasheet, 70V3579S5BCI pinout, 70V3579S5BCI application, or 70V3579S5BCI equivalent, key selection criteria include pipelined latency tolerance, dual-port depth expansion capability via dual chip enables, industrial temperature support (–40°C to +85°C), and per-port VDDQ voltage flexibility (2.5 V/3.3 V).

Technical Context

The 70V3579S5BCI implements full synchronous operation on both ports using edge-triggered registers for address, data, and all control signals-including CE0/CE1, R/W, BE0–BE3, ADS, CNTEN, and CNTRST. Its pipelined output mode introduces one-cycle latency between clock edge and valid data output, enabling deterministic timing at 133 MHz.

Each port features independent OPT pins (OPTL/OPTR) that configure its VDDQ supply voltage (2.5 V or 3.3 V), allowing mixed-voltage system interfacing without level shifters. The internal address counter-enabled by CNTEN and reset by CNTRST-operates independently of external address bus activity when ADS is deasserted.

Key Specifications

Pinout & Package

70V3579S5BCI is packaged in a 208-pin Plastic Quad Flatpack (PQFP) with 0.5 mm lead pitch and 28 mm × 28 mm body size. 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); all VSS pins connect to ground.

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 70V3579S5BCI uniquely delivers industrial temperature support combined with per-port 2.5 V/3.3 V I/O configurability-enabling robust mixed-voltage system integration without added components or thermal derating.

Availability

70V3579S5BCI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and test equipment applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V3579S5BCI 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 ICs for communications and computing markets.

The 70V3579S5BCI belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between heterogeneous processors, FPGAs, and ASICs in real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V3579S5BCI?

The 70V3579S5BCI supports a minimum clock cycle time of 7.5 ns, enabling guaranteed operation at 133 MHz across the full industrial temperature range (–40°C to +85°C). This is validated by tCYC2 parameter in the AC Electrical Characteristics table and confirmed in the Functional Block Diagram timing summary.

Does the 70V3579S5BCI support mixed-voltage operation between its two ports?

Yes-the 70V3579S5BCI supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL to VIH configures the left port for 3.3 V I/O, while setting OPTR to VIL configures the right port for 2.5 V I/O, enabling direct interfacing with heterogeneous logic families without external level shifters.

What is the purpose of the ADS (Address Strobe) signal on the 70V3579S5BCI?

The ADS signal on the 70V3579S5BCI controls whether the external address bus or internal address counter determines the accessed memory location. When ADS is asserted (VIL), the external address is latched on the next clock edge; when ADS is deasserted (VIH), the internal counter advances automatically if CNTEN is enabled.

How does the 70V3579S5BCI handle power management during idle periods?

The 70V3579S5BCI provides four standby current modes. Full standby (ISB3) draws just 6 mA typical when both ports are disabled with CMOS-level inputs. Port-specific standby (ISB2/ISB4) allows one port to remain active while the other enters low-power mode-ideal for asymmetric traffic patterns in networking buffers.

Can the 70V3579S5BCI be used for depth expansion without external logic?

Yes-the 70V3579S5BCI includes dual chip enables (CE0X and CE1X) per port. By cascading CE outputs between devices-for example, connecting CE1L of device 1 to CE0L of device 2-depth expansion up to 64K × 36 or larger is achieved without additional decode logic or gate arrays.