Renesas 70V3399S166BF8

Overview

70V3399S166BF8 from Integrated Device Technology is a high-speed 256K × 18-bit synchronous dual-port static RAM with true dual-port architecture enabling simultaneous read/write access to the same memory location from independent left and right ports. It operates at 166MHz (6ns cycle time, 3.6ns clock-to-data), supports selectable 3.3V or 2.5V I/O voltage per port via OPT pins, and features pipelined output mode only in its 128-pin TQFP package. It is used in real-time packet buffering for telecom line cards requiring deterministic latency and concurrent data flow.

For engineers reviewing the 70V3399S166BF8 datasheet, 70V3399S166BF8 pinout, 70V3399S166BF8 application, or 70V3399S166BF8 equivalent, key selection criteria include guaranteed 166MHz operation under commercial temperature (0°C to +70°C), LVTTL-compatible 3.3V core supply with dual-voltage I/O flexibility, pipelined-output-only timing behavior in PKG128, and support for depth expansion using dual chip enables without external logic.

Technical Context

This device implements full synchronous operation on both ports with registered address, data, and control inputs-enabling minimal setup (1.7ns) and hold (0.5ns) times at 166MHz. Its self-timed write architecture ensures fast cycle time without external wait-state generation.

The memory array uses true dual-port SRAM cells, allowing independent, concurrent access to identical addresses. The integrated address counter with ADS strobe, CNTEN enable, and REPEAT reset provides burst-addressing capability for sequential data transfers without external address sequencing logic.

Key Specifications

Pinout & Package

70V3399S166BF8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package measuring approximately 14 mm × 20 mm × 1.4 mm. All VDD pins require connection to 3.3 V; VDDQL and VDDQR must match the voltage selected by OPTL and OPTR (3.3 V or 2.5 V). A17 is not connected (NC) on both ports.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166AXC and IDT70V9369S166BG, the 70V3399S166BF8 uniquely delivers 256K × 18 density in a 128-pin TQFP with per-port 2.5 V/3.3 V I/O selection-enabling mixed-voltage system integration without package or timing-mode trade-offs.

Availability

70V3399S166BF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and network processor designs requiring stable component supply, long-lifecycle assurance, and commercial-temperature 166 MHz dual-port memory performance.

Supply support for 70V3399S166BF8 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 sensor solutions for communications, computing, and industrial markets.

The 70V33xx family was designed specifically for high-bandwidth, low-latency dual-access memory applications in telecom line cards, test equipment, and real-time embedded systems-emphasizing synchronous timing rigor and flexible I/O voltage operation.

FAQ

What is the maximum operating frequency of the 70V3399S166BF8?

The 70V3399S166BF8 is rated for 166 MHz operation (6 ns clock cycle time) under commercial temperature conditions (0°C to +70°C). This speed is guaranteed with pipelined output mode, which is the only supported mode in its 128-pin TQFP package. The device achieves 3.6 ns clock-to-data-out timing, enabling deterministic latency for real-time systems.

Does the 70V3399S166BF8 support both 2.5 V and 3.3 V I/O interfaces?

Yes, the 70V3399S166BF8 supports selectable 2.5 V or 3.3 V I/O operation per port via dedicated OPTL and OPTR pins. When OPTL is set to VIH (3.3 V), VDDQL must be supplied at 3.3 V; when OPTL is VIL (0 V), VDDQL must be 2.5 V. The same applies independently to the right port. This allows mixed-voltage interfacing-for example, connecting left port to a 3.3 V FPGA and right port to a 2.5 V ASIC.

Why does the 70V3399S166BF8 not support flow-through output mode?

The 70V3399S166BF8 does not support flow-through output mode because its 128-pin TQFP package lacks sufficient pins to implement the FT/PIPE control function. As stated in the datasheet, "Due to limited pin count PL/FT option is not supported on the 128-pin TQFP package. Device is pipelined outputs only on each port." This design choice preserves critical signals like dual chip enables and byte controls within the constrained pinout.

What is the role of the ADS, CNTEN, and REPEAT signals in the 70V3399S166BF8?

The ADS (Address Strobe), CNTEN (Counter Enable), and REPEAT signals enable autonomous burst addressing. ADS loads the current address into the internal counter on its rising edge. When CNTEN is asserted (VIL), the counter auto-increments on each subsequent clock. REPEAT resets the counter to the last ADS-loaded address-allowing rapid re-access to a base location. These features reduce host processor or FPGA overhead in sequential data transfers.

Is JTAG debugging supported on the 70V3399S166BF8?

No, JTAG is not supported on the 70V3399S166BF8. The 128-pin TQFP package does not include the required TCK, TMS, TDI, TDO, and TRST pins due to pin count limitations. As explicitly noted in the datasheet: "Due to the limited pin count, JTAG is not supported in the PKG128 package." JTAG functionality is available only on larger packages like the 208-pin fpBGA (e.g., 70V3399S166BF208).