Renesas 70V3579S6BC

Overview

70V3579S6BC from Integrated Device Technology is a high-speed 32K × 36-bit synchronous dual-port static RAM with pipelined output mode, 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 70V3579S6BC datasheet, 70V3579S6BC pinout, 70V3579S6BC application, or 70V3579S6BC equivalent, this page delivers verified timing parameters, validated 208-pin PQFP package mapping, confirmed dual-port counter/ADS control behavior, and two production-validated alternative parts for depth-expansion or voltage-flexible designs.

Technical Context

The 70V3579S6BC 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-ensuring deterministic setup/hold timing at 133 MHz. Its pipelined output mode introduces one-cycle latency but enables continuous burst throughput without bus turnaround delays.

Each port supports independent I/O voltage selection (3.3 V or 2.5 V) via dedicated OPTL/OPTR pins and corresponding VDDQL/VDDQR supplies, while the core VDD remains fixed at 3.3 V. The internal address counter operates autonomously on rising CLK when CNTEN = L, enabling sequential burst writes without external address generation.

Key Specifications

Pinout & Package

70V3579S6BC is housed 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 level (VIH = 3.3 V, VIL = 0 V).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-100AXC and AS7C33256P-10BIN, the 70V3579S6BC uniquely delivers 133 MHz pipelined throughput with per-port I/O voltage selection-enabling higher-bandwidth, mixed-voltage, and lower-latency system architectures where timing determinism is critical.

Availability

70V3579S6BC is available at Aetrix Electronics and suitable for telecom switching fabric, network packet buffering, and real-time DSP co-processing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 70V3579S6BC 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 70V3579S6BC belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency, multi-processor memory sharing in bandwidth-intensive infrastructure equipment.

FAQ

What is the maximum operating frequency of the 70V3579S6BC in pipelined mode?

The 70V3579S6BC achieves a minimum clock cycle time of 7.5 ns, supporting guaranteed operation at 133 MHz in pipelined mode. This is validated across commercial temperature range (0°C to +70°C) with 3.3 V core supply and proper signal integrity layout. The 70V3579S6BC datasheet specifies tCYC2 = 7.5 ns (max) as the fundamental timing constraint for sustained burst performance.

Does the 70V3579S6BC support independent voltage selection on each port?

Yes, the 70V3579S6BC supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VIH (3.3 V) configures left-port I/Os for 3.3 V operation with VDDQL = 3.3 V; setting OPTR = VIL (0 V) configures right-port I/Os for 2.5 V operation with VDDQR = 2.5 V. The core VDD remains fixed at 3.3 V for both configurations.

How does the address counter function in the 70V3579S6BC?

The 70V3579S6BC incorporates an internal 15-bit address counter per port, enabled by CNTENL/CNTENR. When CNTEN = L on the rising edge of CLK, the counter advances automatically-regardless of ADS or CE state-allowing sequential burst access without external address increment logic. CNTRSTL/CNTRSTR provides asynchronous reset to address 0.

What package type is used for the 70V3579S6BC?

The 70V3579S6BC is packaged in a 208-pin Plastic Quad Flatpack (PQFP) with 0.5 mm lead pitch and 28 mm × 28 mm body dimensions. Pin assignments follow the DRG208 footprint, including dedicated VDD, VSS, VDDQL, VDDQR, and OPT pins. This package is distinct from the 208-pin fpBGA (BF208) and 256-pin BGA (BC256) variants of the same family.

What is the purpose of the dual chip enable (CE0/CE1) architecture in the 70V3579S6BC?

The dual CE0/CE1 pair per port in the 70V3579S6BC enables depth expansion without external decoding logic. Activation requires CE0 = L and CE1 = H; any other combination (CE0 = H or CE1 = L) places the port in low-power standby. This allows stacking multiple 70V3579S6BC devices on shared address/data buses, with only one device active per transaction based on CE decoding.