Renesas 70T3539MS166BCG

Overview

70T3539MS166BCG from IDT (now Renesas) is a high-speed synchronous dual-port SRAM with true dual-access architecture, 512K × 36-bit organization, 2.5V core supply, selectable 2.5V/3.3V I/O interface per port, and pipelined or flow-through output modes. It delivers 3.6ns clock-to-data (tCD2) at 166MHz for real-time inter-processor communication in telecom line cards.

For engineers reviewing the 70T3539MS166BCG datasheet, 70T3539MS166BCG pinout, 70T3539MS166BCG application, or 70T3539MS166BCG equivalent, key selection criteria include simultaneous left/right port access timing, dual-cycle deselect (DCD) support for pipelined output mode, JTAG boundary-scan capability, industrial temperature operation up to +85°C, and BGA256 package compatibility with depth-expansion logic.

Technical Context

The 70T3539MS166BCG implements fully synchronous dual-port operation with independent clock inputs (CLKL/CLKR), separate address strobe enables (ADSL/ADSR), and counter-based address generation controlled by CNTENL/CNTENR and REPEATL/REPEATR. Each port supports byte-selectable writes via four 9-bit BE signals and features dedicated interrupt (INTL/INTR) and collision detection (COLL/COLR) flags.

Its internal architecture includes dual data input registers, self-timed write control, and configurable sleep mode (ZZL/ZZR) that disables dynamic inputs while preserving JTAG accessibility. The device supports mixed-voltage operation: VDD = 2.5V ±100mV for core logic, while VDDQL/VDDQR are independently set to 2.5V or 3.3V based on OPTL/OPTR pin states.

Key Specifications

Pinout & Package

70T3539MS166BCG uses a 256-ball BGA package (body size 17 mm × 17 mm, 1.0 mm ball pitch). Power and ground balls are distributed across the array to minimize noise and ensure stable core/I/O voltage delivery. Pin functions are strictly segregated per port (Left/Right), with no shared signal lines between ports except JTAG and ZZ sleep controls.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166BZXI and AS7C331025B-166BIN, the 70T3539MS166BCG uniquely combines 2.5V core + selectable I/O voltage, pipelined/flow-through mode, integrated collision/interrupt signaling, and JTAG-all in a space-efficient 256-BGA package optimized for high-reliability embedded systems.

Availability

70T3539MS166BCG is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics, and real-time DSP applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70T3539MS166BCG 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 Integrated Device Technology) is a global semiconductor leader specializing in high-performance memory, timing, and analog solutions for communications, computing, and industrial markets.

The 70T3539MS166BCG belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered for deterministic, low-latency inter-processor communication in systems demanding simultaneous multi-domain access and real-time responsiveness.

FAQ

What is the maximum operating frequency of the 70T3539MS166BCG in pipelined mode?

The 70T3539MS166BCG supports up to 166 MHz in pipelined output mode (FT/PIPE = VIH), achieving a 6 ns clock cycle time (tCYC2) and 3.6 ns clock-to-data delay (tCD2). This specification applies to commercial-grade operation (0°C to +70°C); industrial-grade units are rated to 133 MHz (7.5 ns tCYC2).

How does the 70T3539MS166BCG handle simultaneous access to the same memory location from both ports?

The 70T3539MS166BCG uses true dual-port memory cells that permit concurrent read/write operations to identical addresses. When conflict occurs, the device asserts COLL (left) or COLR (right) flags within 4.2 ns, and the last write wins. No bus locking or arbitration circuitry is required-collision status is reported synchronously for firmware handling.

Can the left and right ports of the 70T3539MS166BCG operate at different I/O voltage levels?

Yes. The 70T3539MS166BCG allows independent I/O voltage configuration: OPTL sets VDDQL to 2.5V or 3.3V for the left port, and OPTR sets VDDQR accordingly for the right port. This enables one port to interface with a 2.5V FPGA while the other connects to a 3.3V microcontroller-without external level shifters.

What is the purpose of the REPEATL and REPEATR pins on the 70T3539MS166BCG?

REPEATL and REPEATR reset the internal address counter to the last valid address loaded via ADSL or ADSR, respectively. This enables burst-mode sequential access without continuous address bus updates-ideal for streaming sensor data or instruction fetch in DSP co-processing applications using the 70T3539MS166BCG.

Does the 70T3539MS166BCG support JTAG boundary-scan testing?

Yes. The 70T3539MS166BCG integrates a full IEEE 1149.1-compliant JTAG TAP controller with TCK, TMS, TDI, TDO, and TRST pins. Boundary-scan operates independently of sleep mode (ZZL/ZZR) and remains functional even when core logic is powered down-enabling in-system test and debug throughout the product lifecycle.