Renesas 70T3339S166BC

Overview

70T3339S166BC from Integrated Device Technology is a high-speed synchronous dual-port static RAM with 512K × 18-bit organization, 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 3.6ns clock-to-data access at 166MHz in commercial/industrial temperature range (–40°C to +85°C). It is used in real-time packet buffering for telecom line cards.

For engineers reviewing the 70T3339S166BC datasheet, 70T3339S166BC pinout, 70T3339S166BC application, or 70T3339S166BC equivalent, key selection criteria include simultaneous dual-port access latency, voltage-flexible I/O compatibility, JTAG-compliant boundary scan support, and industrial-grade thermal reliability in high-throughput memory subsystems.

Technical Context

The 70T3339S166BC implements true dual-port SRAM cells enabling concurrent read/write operations on independent left and right ports without arbitration. Its fully synchronous architecture uses registered address, data, and control inputs-achieving 1.5ns setup and 0.5ns hold times at 200MHz operation.

It integrates dual-cycle deselect (DCD) for pipelined output mode, address strobe logic (ADSL/ADSR), counter enable/repeat functions, and collision/interrupt flags. Each port has independent OPT pins to configure I/O voltage (2.5V or 3.3V), and dedicated sleep mode pins (ZZL/ZZR) that reduce current to 5mA while preserving JTAG accessibility.

Key Specifications

Pinout & Package

70T3339S166BC is packaged in a 256-pin Ball Grid Array (BGA) with 17mm × 17mm body and 1.0mm ball pitch. Pin assignments are validated per IDT DSC-5652/11 (November 2019) pin configuration diagram for BC256 package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-166AXC and AS7C331024B-166BIN, the 70T3339S166BC uniquely combines 2.5V core operation, per-port I/O voltage flexibility, IEEE 1149.1 JTAG, and hardware collision detection-making it the only viable option for industrial telecom and safety-critical dual-access memory systems.

Availability

70T3339S166BC is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and test equipment applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70T3339S166BC 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 and computing markets.

The 70T3339S166BC belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for real-time, low-latency memory sharing between independent processors, FPGAs, or ASICs in telecom, defense, and industrial automation.

FAQ

What is the maximum operating frequency supported by the 70T3339S166BC?

The 70T3339S166BC supports up to 166MHz operation across both commercial and industrial temperature ranges. This corresponds to a 6ns clock cycle time in pipelined mode and guarantees 3.6ns clock-to-data access time. The 200MHz speed grade (70T3339S200BC) is not offered in the BC256 package variant.

Does the 70T3339S166BC support independent voltage levels on its left and right ports?

Yes, the 70T3339S166BC supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL to VDD configures the left port for 3.3V I/O operation (with VDDQL = 3.3V), while setting OPTR to VSS configures the right port for 2.5V I/O (with VDDQR = 2.5V). This enables seamless interfacing with heterogeneous logic families.

How does the collision detection feature work in the 70T3339S166BC?

The 70T3339S166BC asserts COLL or COLR outputs when both ports attempt to access the same memory location simultaneously. These open-drain flags require external pull-ups and provide immediate hardware notification-allowing firmware or external logic to resolve contention without polling or timing assumptions. Detection latency is guaranteed at ≤4.2ns.

Can the 70T3339S166BC operate in flow-through output mode, and what is its access time in that mode?

Yes, the 70T3339S166BC supports flow-through output mode when PL/FTL or PL/FTR is driven low. In this mode, data appears combinatorially after address registration, with a maximum access time of 12ns (tCD1) at 166MHz. This mode eliminates pipeline latency but requires stricter timing closure on the system board.

Is JTAG boundary scan supported on the 70T3339S166BC, and which standard does it comply with?

Yes, the 70T3339S166BC includes full IEEE 1149.1-compliant JTAG boundary scan circuitry with TCK, TMS, TDI, TDO, and TRST pins. This enables in-system testability, device identification, and debug access without requiring physical probe points-critical for high-density telecom and industrial PCBs.