Renesas 70V3319S166BC

Overview

70V3319S166BC 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 interfaces per port, and features pipelined output mode only in its 128-pin TQFP package. It is used in real-time packet buffering for telecom line cards.

For engineers reviewing the 70V3319S166BC datasheet, 70V3319S166BC pinout, 70V3319S166BC application, or 70V3319S166BC equivalent, key selection criteria include guaranteed 3.6ns clock-to-data-out timing at 166MHz, dual chip enables for seamless depth expansion, LVTTL-compatible 3.3V core supply with independent 2.5V/3.3V I/O voltage selection per port, and industrial-grade operation up to +85°C.

Technical Context

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

The memory array uses true dual-port cells, allowing concurrent access without arbitration logic. The 128-pin TQFP variant omits JTAG and PL/FT select functionality due to pin count constraints, fixing pipelined output mode and disabling boundary-scan capability.

Key Specifications

Pinout & Package

70V3319S166BC is housed in a 128-pin Thin Quad Flatpack (TQFP) package with 0.5 mm pitch, body size 14 mm × 20 mm × 1.4 mm. All VDD pins require connection to 3.3 V; VDDQL and VDDQR must match OPTL/OPTR logic levels (3.3 V if VIH, 2.5 V if VIL). JTAG and FT/PIPE select are not implemented in this package variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166AXC and AS7C3256B-166JC, the 70V3319S166BC uniquely supports per-port 2.5V/3.3V I/O selection and integrated address counter with repeat-reducing FPGA logic utilization and enabling mixed-voltage interoperability without level shifters.

Availability

70V3319S166BC is available at Aetrix Electronics and suitable for telecom infrastructure, network packet processing, digital signal co-processing, and real-time industrial control applications requiring stable component supply and long-term manufacturability.

Supply support for 70V3319S166BC 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 power management ICs 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, packet processors, and real-time control systems demanding deterministic timing and flexible I/O voltage support.

FAQ

What is the maximum operating frequency of the 70V3319S166BC?

The 70V3319S166BC is rated for 166 MHz operation, achieving a 6 ns clock cycle time. This specification applies to commercial temperature range (0°C to +70°C) operation and is validated with pipelined output mode, which is the only supported mode in its 128-pin TQFP package. The device delivers 6 Gbps aggregate bandwidth across both ports at this rate.

Does the 70V3319S166BC support JTAG boundary-scan testing?

No, the 70V3319S166BC does not support JTAG boundary-scan. As explicitly stated in the datasheet notes for the PKG128 (128-pin TQFP) package, JTAG functionality-including TDI, TDO, TCK, TMS, and TRST pins-is omitted due to insufficient pin count. JTAG is only available on the 208-pin and 256-pin BGA variants of the 70V3319/99 family.

Can the left and right ports of the 70V3319S166BC operate at different I/O voltages?

Yes, the 70V3319S166BC supports independent I/O voltage selection per port. OPTL and OPTR pins configure VDDQL and VDDQR independently: VIH (3.3 V) selects 3.3 V I/O levels, while VIL (0 V) selects 2.5 V I/O levels. This allows the left port to interface with 3.3 V logic while the right port connects to 2.5 V peripherals-enabling mixed-voltage system integration without external level shifters.

What is the purpose of the CNTEN and REPEAT signals on the 70V3319S166BC?

The CNTEN (counter enable) and REPEAT signals provide hardware-accelerated address sequencing. When CNTEN is asserted, the internal address counter advances on each clock edge, eliminating software overhead for burst transfers. REPEAT resets the counter to the last valid address loaded via ADS, enabling rapid re-access to a known location-critical for FIFO-like behavior or repeated table lookups in real-time systems using the 70V3319S166BC.

Is the 70V3319S166BC pin-compatible with other members of the 70V3319/99 family?

No, the 70V3319S166BC is not pin-compatible with other package variants of the 70V3319/99 family. Its 128-pin TQFP footprint differs electrically and physically from the 208-pin fpBGA and 256-pin BGA packages. Key differences include missing JTAG pins, absence of FT/PIPE select functionality, and NC status for A17 on both ports-making direct PCB replacement impossible without layout revision.