Renesas 70T3319S166BC

Overview

70T3319S166BC 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, 3.4 ns clock-to-data-out (pipelined), 166 MHz operation, and selectable 2.5V/3.3V I/O interface per port - deployed in high-bandwidth packet buffering for telecom line cards.

For engineers reviewing the 70T3319S166BC datasheet, 70T3319S166BC pinout, 70T3319S166BC application, or 70T3319S166BC equivalent, key selection criteria include pipelined vs. flow-through output mode timing, independent port voltage configuration via OPT pins, collision/interrupt flag behavior, JTAG 1149.1 compliance, and BGA package thermal-mechanical constraints for high-density routing.

Technical Context

This device implements fully synchronous dual-port SRAM logic with separate address, data, and control registers on each port, supporting concurrent access with minimal setup/hold requirements (1.5 ns setup, 0.5 ns hold). It features dual chip enables (CE0/CE1) for depth expansion without external logic and supports both pipelined (5 ns cycle, tCD2 = 3.6 ns) and flow-through (20 ns cycle, tCD1 = 12 ns) output modes selected per port via PL/FT pins.

The memory includes integrated address counter with ADS strobe, CNTEN enable, and REPEAT reset functionality - enabling burst-mode sequential addressing without external counters. Collision detection and interrupt flags (COLL/INTR) are generated synchronously to CLK and provide deterministic latency (tCOLS = 3.6 ns, tINS = 7 ns) for arbitration in shared-memory systems.

Key Specifications

Pinout & Package

70T3319S166BC is housed in a 256-pin Ball Grid Array (BC256) package measuring 17 mm × 17 mm × 1.4 mm with 1.0 mm ball pitch. All VDD pins require connection to 2.5V; VDDQ pins must be supplied at either 2.5V or 3.3V depending on OPT pin state per port. A17L and A18L are no-connects, confirming the 256K × 18 organization (18 address bits: A0–A16).

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-166JCIN, the 70T3319S166BC delivers unique value through per-port voltage configurability, hardware collision detection, JTAG testability, and integrated address counter - reducing BOM count and firmware complexity in high-reliability embedded systems.

Availability

70T3319S166BC is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, medical imaging, and defense electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70T3319S166BC 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 70T33xx family was designed specifically for high-throughput, low-latency shared-memory applications in networking equipment and real-time control systems - emphasizing deterministic timing, dual-port concurrency, and robust signal integrity at 166+ MHz.

FAQ

What is the maximum operating frequency of the 70T3319S166BC in pipelined mode?

The 70T3319S166BC supports up to 166 MHz in pipelined output mode (tCYC2 = 6 ns minimum), with verified 3.6 ns clock-to-data-out (tCD2) timing across commercial and industrial temperature ranges. This frequency is achievable using the BC256 BGA package; the BF208 fpBGA variant does not support 200 MHz or 166 MHz in industrial grade per datasheet note 7.

How does the OPT pin affect I/O voltage levels on the 70T3319S166BC?

The OPTL and OPTR pins independently configure each port's I/O voltage standard: when pulled to VDD (2.5V), the associated port operates at 3.3V logic levels (VIH = 2.0 V min, VDDQ = 3.3V); when pulled to VSS (0V), it operates at 2.5V levels (VIH = 1.7 V min, VDDQ = 2.5V). This enables mixed-voltage system integration without level shifters.

Does the 70T3319S166BC support hardware collision detection, and how is it implemented?

Yes, the 70T3319S166BC provides dedicated COLL and COLR outputs that assert within 3.6 ns (tCOLS) when both ports simultaneously write to the same memory location. The flag remains asserted until cleared by subsequent non-colliding accesses - enabling immediate hardware arbitration without software polling or additional logic.

What is the purpose of the ADS, CNTEN, and REPEAT signals on the 70T3319S166BC?

ADSL/ADSR latches the current address into an internal counter; CNTENL/CNTENR enables automatic address increment on each clock; REPEATL/REPEATR resets the counter to the last ADS-loaded address. Together, they enable burst-mode sequential memory access without external address generation - reducing controller overhead in packet buffering and video frame handling.

Can the 70T3319S166BC operate in sleep mode while maintaining JTAG functionality?

Yes, asserting ZZL or ZZR places the corresponding port into ultra-low-power sleep mode (Izz = 5–15 mA), but JTAG signals (TCK, TMS, TDI, TDO, TRST) remain fully functional and unaffected. The datasheet explicitly recommends avoiding boundary scan during sleep mode, but the TAP controller remains accessible for debug and programming.