Renesas 70V3319S166BFG

Overview

70V3319S166BFG 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 6Gbps aggregate bandwidth, supports selectable 3.3V or 2.5V I/O voltage per port, and features pipelined output mode only (no flow-through) in its 128-pin TQFP package. It is used in real-time packet buffering for telecom line cards.

For engineers reviewing the 70V3319S166BFG datasheet, 70V3319S166BFG pinout, 70V3319S166BFG application, or 70V3319S166BFG equivalent, key selection criteria include guaranteed 166MHz operation under commercial temperature, dual chip enable for depth expansion, JTAG support exclusion in this package, and mandatory pipelined output configuration due to pin count constraints.

Technical Context

This device implements full synchronous operation on both ports with registered address, data, and control inputs-enabling 1.7ns setup and 0.5ns hold times at 166MHz. Its memory array uses true dual-port cells, not pseudo-dual-port or FIFO-based emulation, allowing concurrent access without arbitration logic.

The 70V3319S166BFG integrates independent address counters per port with CNTEN/REPEAT/ADSR controls, supports byte-selectable writes via UBL/LBL, and includes automatic power-down via dual CE0/CE1 enables. Core VDD is fixed at 3.3V ±150mV while VDDQ per port is configurable to 3.3V or 2.5V via OPTL/OPTR pins.

Key Specifications

Pinout & Package

70V3319S166BFG is housed in a 128-pin Thin Quad Flatpack (TQFP) with 0.4mm lead pitch and 14mm × 20mm footprint. All VDD pins require connection to 3.3V; VDDQ pins must match OPT pin voltage selection (3.3V if OPT = VIH, 2.5V if OPT = VIL). JTAG and flow-through mode are omitted due to pin count constraints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166AXC and IDT70V3319S133BG, the 70V3319S166BFG offers highest speed in a compact TQFP package but sacrifices JTAG and flow-through mode-making it optimal for cost-sensitive, high-volume commercial telecom buffers where layout simplicity and 166MHz performance are primary.

Availability

70V3319S166BFG is available at Aetrix Electronics and suitable for telecom infrastructure, real-time DSP subsystems, and industrial motion control requiring stable component supply with verified commercial-grade timing compliance.

Supply support for 70V3319S166BFG 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V33xx family targets high-bandwidth, low-latency shared memory applications in networking and signal processing systems where deterministic dual-port access and synchronous timing are critical.

FAQ

What is the maximum guaranteed operating frequency of the 70V3319S166BFG?

The 70V3319S166BFG is rated for 166MHz operation (6ns clock cycle time) under commercial temperature conditions (0°C to +70°C). This is validated by tCYC2 ≤ 6ns and tCD2 ≤ 3.6ns parameters in the datasheet. It does not support 133MHz industrial-grade operation-the 70V3319S133BG variant is required for −40°C to +85°C environments.

Does the 70V3319S166BFG support flow-through output mode?

No, the 70V3319S166BFG does not support flow-through output mode. Due to pin count limitations in its 128-pin TQFP package (PKG128), the FT/PIPEL and FT/PIPER pins are unimplemented-only pipelined output mode is available. This is explicitly stated in the datasheet notes on pages 4 and 5.

Can both ports of the 70V3319S166BFG operate at different I/O voltages?

Yes, the 70V3319S166BFG supports independent I/O voltage selection per port: OPTL configures the left port's VDDQL (3.3V or 2.5V), and OPTR configures the right port's VDDQR. The core VDD remains fixed at 3.3V. This allows one port to interface with a 3.3V FPGA while the other connects to a 2.5V ASIC without external level shifters.

Is JTAG debugging supported on the 70V3319S166BFG?

No, JTAG is not supported on the 70V3319S166BFG. The 128-pin TQFP package lacks dedicated TCK, TMS, TDO, and TDI pins due to insufficient pin count-JTAG functionality is only available on the 208-pin and 256-pin BGA variants of the 70V3319/99 family.

What is the purpose of the CNTEN and REPEAT signals on the 70V3319S166BFG?

The CNTEN signal enables automatic address incrementing on each clock cycle, while REPEAT resets the internal address counter to the last valid address loaded via ADS. Together, they enable hardware-managed burst access-critical for DMA-like transfers in network processors and DSPs without CPU intervention.