Renesas 70T3399S133BC8

Overview

70T3399S133BC8 from Integrated Device Technology is a high-speed synchronous dual-port static RAM with 128K × 18-bit organization (2,304,000 bits), 2.5V core supply, selectable 2.5V/3.3V I/O interface per port, and industrial-grade operation up to 133MHz. It supports true simultaneous read/write access on independent left/right ports and delivers 4.2ns max clock-to-data (pipelined mode) for real-time data buffering in telecom line cards and packet-switching engines.

For engineers reviewing the 70T3399S133BC8 datasheet, 70T3399S133BC8 pinout, 70T3399S133BC8 application, or 70T3399S133BC8 equivalent, key selection criteria include pipelined vs. flow-through output timing, dual-chip-enable depth expansion capability, JTAG-compliant boundary scan support, and independent OPT-pin-controlled I/O voltage selection per port - all critical for multi-protocol interface bridging and deterministic latency systems.

Technical Context

This device implements fully synchronous dual-port architecture with separate address, data, and control registers on both ports, enabling 1.5ns setup and 0.5ns hold times on all inputs at 200MHz. Its self-timed write logic minimizes cycle time while maintaining compatibility with burst-oriented unidirectional/bidirectional data flows.

Each port features independent pipeline/flow-through mode selection (PL/FTL/R), counter enable (CNTENL/R), address strobe (ADSL/R), repeat functionality (REPEATL/R), and collision/interrupt flags (COLL/INTR, COLR/INTR). JTAG IEEE 1149.1 compliance enables in-system testability without requiring external test logic.

Key Specifications

Pinout & Package

70T3399S133BC8 is housed in a 256-ball BGA (package code BC256), with 17mm × 17mm footprint and 1.0mm ball pitch. Power and ground balls are distributed across the array to minimize noise coupling; VDD (2.5V core) and VDDQ (2.5V/3.3V I/O) supplies require dedicated decoupling per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and AS7C3128B-133JIN, the 70T3399S133BC8 uniquely supports per-port I/O voltage selection via OPT pins, includes IEEE 1149.1 JTAG, and provides hardware collision detection - making it the only option among the three suitable for mixed-voltage, safety-critical, or debug-intensive embedded systems.

Availability

70T3399S133BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, network processor co-processing, and industrial motion control applications requiring stable component supply, long-term lifecycle assurance, and industrial temperature compliance.

Supply support for 70T3399S133BC8 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, and RF power solutions for communications and computing markets.

The 70T3339/19/99 family was designed specifically for high-bandwidth, low-latency dual-port buffering in telecom line cards, network processors, and FPGA-based protocol bridges - emphasizing deterministic timing, voltage flexibility, and JTAG testability.

FAQ

What is the maximum operating frequency supported by the 70T3399S133BC8?

The 70T3399S133BC8 is rated for 133MHz operation in both commercial and industrial temperature ranges. This corresponds to a 7.5ns minimum clock cycle time in pipelined mode (tCYC2), verified per datasheet Table 11. It does not support 200MHz - that speed grade is restricted to the S200 suffix variants and unavailable in this BGA package.

How does the OPT pin affect I/O voltage levels on the 70T3399S133BC8?

On the 70T3399S133BC8, OPTL and OPTR independently configure each port's I/O interface: when OPTX = VDD (2.5V), the port operates at 3.3V logic levels and requires VDDQX = 3.3V; when OPTX = VSS (0V), it operates at 2.5V levels with VDDQX = 2.5V. This allows mixed-voltage system integration without external level shifters.

Does the 70T3399S133BC8 support JTAG boundary scan testing?

Yes, the 70T3399S133BC8 fully complies with IEEE 1149.1 JTAG standards. It includes dedicated TDI, TDO, TCK, TMS, and TRST pins, and supports instruction register loading, data register scanning, and boundary scan testing - enabling in-system verification without physical probe access.

What is the purpose of the ZZ (sleep mode) pin on the 70T3399S133BC8?

The ZZL and ZZR pins on the 70T3399S133BC8 place their respective ports into ultra-low-power sleep mode when driven high (VIH). In this state, dynamic inputs are disabled, reducing current to 5mA (ISB3), while JTAG remains functional and static inputs (e.g., OPT, PL/FT) retain their states - ideal for power-gated subsystems.

Can the 70T3399S133BC8 perform simultaneous read and write operations on the same memory location?

Yes, the 70T3399S133BC8 uses true dual-port memory cells that permit simultaneous read and write access to the same address - one port reads while the other writes. Collision detection flags (COLL/COLR) assert asynchronously to signal such contention, allowing software to resolve conflicts without data corruption.