Renesas 70V3399S166BC

Overview

70V3399S166BC 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, 3.6ns clock-to-data), 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 and FPGA co-processor data exchange.

For engineers reviewing the 70V3399S166BC datasheet, 70V3399S166BC pinout, 70V3399S166BC application, or 70V3399S166BC 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 compliance in PKG128, and dual chip enable support for seamless depth expansion without external logic.

Technical Context

The 70V3399S166BC implements fully synchronous dual-port operation with independent clock inputs (CLKL/CLKR), separate address/data/control registers per port, and self-timed write control. Its memory array uses true dual-port cells-no arbitration logic required-and includes dedicated address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and repeat (REPEATL/REPEATR) functions for burst-mode addressing.

It supports JTAG IEEE 1149.1 boundary-scan on packages with sufficient pins but excludes JTAG in the 128-pin TQFP due to pin count limitation. The OPTL/OPTR pins configure each port's I/O voltage (3.3V or 2.5V), while VDD remains fixed at 3.3V ±150mV; A17 is no-connect on this variant.

Key Specifications

Pinout & Package

70V3399S166BC is housed in a 128-pin Thin Quad Flatpack (TQFP) package with 0.5 mm pitch, 14 mm × 20 mm footprint, and 1.4 mm height. All VDD pins require connection to 3.3V; VDDQL/VDDQR must match OPTL/OPTR settings (3.3V if VIH, 2.5V if VIL). A17L and A17R are no-connects.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166AXC and IDT70V27L15PF8, the 70V3399S166BC uniquely delivers 166MHz synchronous dual-port performance in a pin-compatible 128-pin TQFP package with per-port I/O voltage selection-enabling high-speed, mixed-voltage system integration without layout change or mode configuration overhead.

Availability

70V3399S166BC is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA acceleration, real-time DSP, and industrial motion control applications requiring stable component supply and long-term obsolescence management.

Supply support for 70V3399S166BC 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 data buffering in synchronous systems-specifically engineered for telecom line cards, FPGA co-processing, and real-time control where deterministic dual-port access and sub-4ns output timing are critical.

FAQ

What is the maximum operating frequency of the 70V3399S166BC?

The 70V3399S166BC is rated for 166MHz operation (6ns clock cycle time) under commercial temperature conditions (0°C to +70°C). This frequency is validated with pipelined output mode and applies to both left and right ports independently. The device does not support flow-through mode in its 128-pin TQFP package due to pin count limitations, so all timing specifications assume pipelined operation.

Does the 70V3399S166BC support 2.5V I/O operation on both ports simultaneously?

Yes, the 70V3399S166BC supports independent 2.5V I/O operation on both ports: OPTL and OPTR can each be set to VIL (0V) to configure VDDQL and VDDQR for 2.5V supply, respectively. The core VDD remains fixed at 3.3V. This enables mixed-voltage system integration-for example, connecting the left port to a 2.5V FPGA bank and the right port to a 3.3V microcontroller bus-without external level shifters.

Is JTAG boundary-scan supported on the 70V3399S166BC?

No, JTAG boundary-scan (IEEE 1149.1) is not supported on the 70V3399S166BC because it is packaged in a 128-pin TQFP (PKG128), which lacks sufficient pins to accommodate the required TCK, TMS, TDI, TDO, and TRST signals. JTAG is available only on the 208-pin fpBGA and 256-pin BGA variants of the 70V3319/99 family.

What is the function of the REPEAT signal in the 70V3399S166BC?

The REPEAT signal (REPEATL/REPEATR) resets the internal address counter to the last valid address loaded via ADSL or ADSR. When asserted, it enables rapid re-access to a previously latched address-useful for circular buffer management or repeated reads/writes to a fixed location. The REPEAT address is not initialized at power-up; a known address must be loaded via ADS during system initialization to establish the starting point.

Can the 70V3399S166BC be used in industrial temperature applications?

No, the 70V3399S166BC is specified only for commercial temperature range (0°C to +70°C). Industrial-grade operation (–40°C to +85°C) is supported by the 70V3399S133BC variant, which is rated for 133MHz maximum frequency. The "166" suffix in the part number explicitly denotes the 166MHz commercial-speed grade and excludes industrial qualification.