Renesas 70V3399S166BFG

Overview

70V3399S166BFG from Integrated Device Technology is a high-speed 256K × 18-bit synchronous dual-port SRAM 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), delivers 3.6ns clock-to-data-out in pipelined mode, supports selectable 3.3V or 2.5V I/O interfaces per port, and targets real-time data buffering in telecom line cards and network packet processors.

For engineers reviewing the 70V3399S166BFG datasheet, 70V3399S166BFG pinout, 70V3399S166BFG application, or 70V3399S166BFG equivalent, key selection criteria include its 166MHz pipelined timing, dual-chip-enable depth expansion capability, separate byte enables for bus matching, JTAG-compliant test support (in BGA packages), and industrial-grade operation up to +85°C - all critical for deterministic latency in high-throughput switching fabric designs.

Technical Context

This device implements fully synchronous dual-port operation with registered address, data, and control inputs on both ports, enabling minimal setup/hold times (1.7ns setup, 0.5ns hold @ 166MHz) and fast 6ns cycle time. Its memory array uses true dual-port cells, not pseudo-dual-port or FIFO-based emulation, allowing concurrent conflict-free access without arbitration logic.

The 70V3399S166BFG integrates per-port address counters with CNTEN/REPEAT/ADSR controls for burst-mode sequential addressing, and supports Dual Cycle Deselect (DCD) in pipelined output mode to manage output enable timing across multiple devices. Core voltage is fixed at 3.3V ±150mV, while I/O voltage per port is independently configurable via OPTL/OPTR pins to either 3.3V or 2.5V.

Key Specifications

Pinout & Package

70V3399S166BFG is housed in a 128-pin Thin Quad Flatpack (TQFP) package measuring 14 mm × 20 mm × 1.4 mm, with 0.5 mm lead pitch. The package supports reflow soldering and is RoHS-compliant (Green part). JTAG is omitted due to pin count constraints; pipelined output mode is fixed (no PL/FT select).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV18 and AS7C3256B, the 70V3399S166BFG uniquely combines 166MHz synchronous operation, 3.3V core compatibility, industrial temperature range, and per-port I/O voltage flexibility - making it the only viable choice for new high-speed, mixed-voltage, ruggedized embedded designs.

Availability

70V3399S166BFG is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation controllers, and radar signal processing systems requiring stable component supply across extended product lifecycles.

Supply support for 70V3399S166BFG 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, specializes in high-performance timing, memory interface, and RF power solutions for communications and computing markets.

The 70V3399S166BFG belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic-latency data buffering in telecom switching fabrics, network processors, and real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V3399S166BFG?

The 70V3399S166BFG is rated for 166MHz operation with a 6ns clock cycle time. This is validated under commercial temperature conditions (0°C to +70°C) and requires pipelined output mode (fixed in the 128-pin TQFP package). At this speed, it achieves 3.6ns clock-to-data-out latency and 6Gbps aggregate bandwidth.

Does the 70V3399S166BFG support both 3.3V and 2.5V I/O interfaces?

Yes, the 70V3399S166BFG supports per-port selectable I/O voltages: OPTL and OPTR pins independently configure VDDQL and VDDQR to either 3.3V or 2.5V. This allows one port to interface with a 3.3V FPGA while the other connects to a 2.5V ASIC - eliminating external level shifters in mixed-voltage systems.

Is JTAG debugging supported on the 70V3399S166BFG in its 128-pin TQFP package?

No, JTAG is not supported on the 70V3399S166BFG in the 128-pin TQFP package due to insufficient pin count, as explicitly stated in the datasheet notes. JTAG functionality (TCK, TMS, TDI, TDO, TRST) is only available in the 208-pin and 256-pin BGA variants of the 70V3319/99 family.

What is the role of the CNTEN and REPEAT pins on the 70V3399S166BFG?

CNTEN enables the internal address counter on each port, advancing the address automatically on each clock edge when asserted. REPEAT resets the counter to the last valid address loaded via ADS (Address Strobe), enabling efficient burst reads/writes without continuous host address updates - reducing CPU overhead in streaming data paths.

Can the 70V3399S166BFG operate in flow-through output mode?

No, the 70V3399S166BFG in the 128-pin TQFP package operates exclusively in pipelined output mode. The FT/PIPEL and FT/PIPER pins are fixed to enable pipelining, as confirmed by the datasheet note: "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."