Renesas 70T3539MS133BCG

Overview

70T3539MS133BCG from IDT (now Renesas) is a high-speed synchronous dual-port static RAM with true dual-port architecture, 512K × 36-bit organization, 2.5V core supply, and selectable 2.5V/3.3V I/O interface per port. It supports simultaneous read/write access to the same memory location and delivers 4.2ns clock-to-data (pipelined mode) at 133MHz for industrial applications in packet buffering, FPGA co-processing, and real-time DSP systems.

For engineers reviewing the 70T3539MS133BCG datasheet, 70T3539MS133BCG pinout, 70T3539MS133BCG application, or 70T3539MS133BCG equivalent, key selection criteria include pipelined vs. flow-through output timing, independent port voltage configuration (via OPTL/OPTR), collision/interrupt flag support, JTAG boundary-scan capability, and industrial-grade (-40°C to +85°C) operation at full 133MHz speed.

Technical Context

The 70T3539MS133BCG implements fully synchronous dual-port operation with separate clock domains (CLKL/CLKR), register-controlled address/data/control inputs, and dual-cycle deselect (DCD) for pipelined output mode. Its internal address counter supports auto-increment via CNTEN and repeat addressing via REPEATL/REPEATR - both independent of chip enable states.

Each port features independent power domains: VDD (2.5V ±100mV) for core logic and configurable VDDQ (2.5V or 3.3V ±150mV/±100mV) for I/Os, selected by OPTL/OPTR pins. Sleep mode (ZZL/ZZR) disables dynamic inputs while preserving JTAG accessibility and static control pin functionality.

Key Specifications

Pinout & Package

70T3539MS133BCG is housed in a 256-pin BGA (17 mm × 17 mm, 1.0 mm ball pitch) with symmetric left/right port layout. Power delivery requires dedicated VDD (2.5V), VDDQL/VDDQR (2.5V/3.3V), and VSS pins distributed across the array; thermal and signal integrity are enhanced by ground plane coverage and decoupling pin adjacency.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1354BV33-133AXC and AS7C35128PFS-133BIN, the 70T3539MS133BCG uniquely supports per-port I/O voltage selection, pipelined/flow-through mode switching, hardware collision detection, and IEEE 1149.1 JTAG - making it optimal for complex, mixed-voltage, real-time embedded systems requiring deterministic inter-port coordination.

Availability

70T3539MS133BCG is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA acceleration, real-time DSP, and industrial motion control applications requiring stable component supply, long-term lifecycle assurance, and industrial temperature compliance.

Supply support for 70T3539MS133BCG 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 70T3539MS133BCG belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered for deterministic latency, concurrent port access, and robust operation in mission-critical embedded systems.

FAQ

What is the maximum guaranteed operating frequency of the 70T3539MS133BCG under industrial conditions?

The 70T3539MS133BCG is rated for guaranteed operation up to 133 MHz across the full industrial temperature range (-40°C to +85°C). This corresponds to a 7.5 ns clock cycle time in pipelined mode and is validated per AC Electrical Characteristics Table 11 in the official datasheet. The part does not support 166 MHz operation in industrial grade - that speed is limited to commercial temperature range variants (e.g., 70T3539MS166).

How does the 70T3539MS133BCG handle simultaneous access to the same memory address from both ports?

The 70T3539MS133BCG uses true dual-port memory cells that permit simultaneous read/write to the same address. When conflict occurs, hardware collision detection asserts COLL or COLR flags within 4.2 ns. The device does not block or arbitrate access - instead, it relies on external logic or firmware to resolve contention using these flags, preserving deterministic timing behavior.

Can the left and right ports of the 70T3539MS133BCG operate at different I/O voltage levels?

Yes - the 70T3539MS133BCG supports independent I/O voltage configuration per port. OPTL sets left-port VDDQL (2.5V or 3.3V), and OPTR sets right-port VDDQR (2.5V or 3.3V). This allows one port to interface with a 2.5V FPGA while the other connects to a 3.3V microcontroller, eliminating external level shifters and simplifying board design.

What is the function of the REPEATL and REPEATR pins on the 70T3539MS133BCG?

REPEATL and REPEATR reset their respective port's internal address counter to the last valid address loaded via ADSL or ADSR. This enables efficient burst-mode sequential access without continuous host address updates - for example, in DMA transfers or circular buffer implementations where the starting address must be reloaded after wraparound.

Does the 70T3539MS133BCG support JTAG boundary-scan testing, and what pins are required?

Yes - the 70T3539MS133BCG includes full IEEE 1149.1 JTAG boundary-scan support. Required pins are TCK (Test Clock), TMS (Test Mode Select), TDI (Test Data In), TDO (Test Data Out), and TRST (Test Reset). JTAG remains functional even during sleep mode (ZZL/ZZR asserted), enabling in-system test without disrupting system power states.