Renesas 70T3319S166BC8

Overview

70T3319S166BC8 from Integrated Device Technology is a high-speed synchronous dual-port static RAM with 256K × 18-bit organization (4.5 Mbit), 2.5V core supply, and selectable 2.5V/3.3V I/O interface per port. It supports pipelined or flow-through output modes, features dual chip enables for depth expansion, and delivers 3.6 ns clock-to-data access at 166 MHz in commercial/industrial temperature range (–40°C to +85°C) - used in real-time packet buffering and inter-processor communication in telecom line cards.

For engineers reviewing the 70T3319S166BC8 datasheet, 70T3319S166BC8 pinout, 70T3319S166BC8 application, or 70T3319S166BC8 equivalent, key selection criteria include simultaneous dual-port read/write capability, JTAG-compliant boundary scan support, independent port voltage selection via OPT pins, and collision/interrupt flag generation for arbitration-critical systems.

Technical Context

The 70T3319S166BC8 implements true dual-port SRAM cells enabling concurrent access to any memory location from left and right ports without arbitration logic. Its fully synchronous architecture uses registered address, data, and control inputs on both ports, achieving 1.5 ns setup and 0.5 ns hold times at 200 MHz operation.

Each port includes independent pipeline/flow-through mode selection (PL/FTL/R), address strobe (ADSL/R), counter enable (CNTENL/R), repeat (REPEATL/R), and byte-enable controls (UBL/LBL and UBR/LBR). Collision detection and interrupt flags (COLL/INTR, COLR/INTR) are generated synchronously with port clocks for deterministic inter-port coordination.

Key Specifications

Pinout & Package

70T3319S166BC8 is housed in a 256-ball BGA (package code BC256), with 1.0 mm pitch and 17 mm × 17 mm footprint. Power delivery requires 12 dedicated VDD pins (2.5 V core), 16 VDDQ pins (per-port I/O supply), and 42 VSS ground balls distributed for low-inductance return paths. Address A18 is No Connect (NC) per datasheet Note 1.

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 70T3319S166BC8 uniquely combines 166 MHz synchronous operation, per-port voltage flexibility, JTAG testability, and hardware collision/interrupt signaling - making it the only option for high-reliability, mixed-voltage, real-time shared-memory systems.

Availability

70T3319S166BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for 70T3319S166BC8 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 70T33xx family was engineered specifically for deterministic, low-latency inter-processor and packet-buffering applications demanding true dual-port concurrency, hardware arbitration, and mixed-voltage interoperability.

FAQ

What is the maximum operating frequency of the 70T3319S166BC8?

The 70T3319S166BC8 is rated for 166 MHz operation across the industrial temperature range (–40°C to +85°C), delivering a 6 ns clock cycle time in pipelined mode. This speed grade is validated with 3.6 ns clock-to-data access and meets all AC timing parameters in the official IDT datasheet DSC-5652/11.

Does the 70T3319S166BC8 support independent voltage selection on each port?

Yes, the 70T3319S166BC8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL to VDD (2.5 V) configures the left port for 3.3 V signaling with VDDQL = 3.3 V; setting it to VSS (0 V) configures 2.5 V operation with VDDQL = 2.5 V - same applies to the right port using OPTR.

How does collision detection work on the 70T3319S166BC8?

The 70T3319S166BC8 asserts COLL (left port) or COLR (right port) when both ports attempt a write to the same memory location simultaneously. The flag remains active until cleared by a subsequent read or write to that address, providing hardware-level arbitration without software intervention - critical for lock-free inter-processor protocols.

What package type is used for the 70T3319S166BC8?

The 70T3319S166BC8 uses a 256-ball BGA package (code BC256), measuring 17 mm × 17 mm × 1.4 mm with 1.0 mm ball pitch. Pin A18 is designated No Connect (NC) per datasheet Note 1, confirming its 256K × 18-bit configuration.

Is JTAG boundary scan supported on the 70T3319S166BC8?

Yes, the 70T3319S166BC8 integrates IEEE 1149.1-compliant JTAG test logic with dedicated TCK, TRST, TMS, TDI, and TDO pins. Boundary scan operates independently of memory function and remains accessible even in sleep mode (ZZ asserted), enabling in-system verification without disrupting system operation.