Renesas 70T3399S166BC

Overview

70T3399S166BC from Integrated Device Technology is a high-speed 2.5V synchronous dual-port static RAM with 256K × 18-bit organization (4.6 Mbit), 166MHz operation, pipelined/flow-through output modes, and independent 2.5V/3.3V I/O voltage selection per port. It enables simultaneous read/write access to shared memory in real-time digital signal processing systems.

For engineers reviewing the 70T3399S166BC datasheet, 70T3399S166BC pinout, 70T3399S166BC application, or 70T3399S166BC equivalent, key selection criteria include its 3.6ns clock-to-data (pipelined), dual chip enables for depth expansion, JTAG-compliant boundary scan, industrial temperature support (−40°C to +85°C), and 256-pin BGA package with verified pin mapping.

Technical Context

This device implements true dual-port SRAM architecture with fully synchronous operation on both left and right ports, using edge-triggered registers for address, data, and control inputs to achieve tight timing margins (1.5ns setup, 0.5ns hold). Its self-timed write cycle enables minimal 6ns pipelined cycle time at 166MHz.

Each port supports independent voltage configuration via OPTL/OPTR pins-selecting either 2.5V or 3.3V I/O levels-and includes dedicated byte enables (UBL/LBL, UBR/LBR), address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and repeat logic for burst addressing. Collision detection and interrupt flags provide hardware-level arbitration between ports.

Key Specifications

Pinout & Package

70T3399S166BC is housed in a 256-pin Ball Grid Array (BGA) package measuring 17mm × 17mm × 1.4mm with 1.0mm ball pitch. All VDD pins require 2.5V connection; VDDQ pins must be set to 2.5V or 3.3V depending on OPT pin state per port.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 70T3399S133BC and 70T3399S166BF, the 70T3399S166BC delivers optimal balance of 166MHz performance, industrial temperature reliability, and 256-pin BGA mechanical compatibility for high-density backplane applications.

Availability

70T3399S166BC 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 70T3399S166BC 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 70T33xx family was designed specifically for high-bandwidth, low-latency dual-access memory applications in real-time systems where deterministic timing and hardware arbitration are critical-such as packet switching, DSP co-processing, and motion control.

FAQ

What is the maximum guaranteed operating frequency of the 70T3399S166BC?

The 70T3399S166BC is rated for guaranteed operation up to 166MHz across both commercial (0°C to +70°C) and industrial (−40°C to +85°C) temperature ranges. This is validated by its 6ns maximum clock cycle time (tCYC2) in pipelined mode, with 3.6ns clock-to-data delay (tCD2) under worst-case conditions. The 200MHz speed grade (70T3399S200BC) is not offered in the 256-pin BGA package.

Does the 70T3399S166BC support independent voltage operation on its two ports?

Yes, the 70T3399S166BC supports fully independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL to VDD (2.5V) configures the left port for 3.3V I/O levels (requiring VDDQL = 3.3V), while setting OPTR to VSS (0V) configures the right port for 2.5V I/O (requiring VDDQR = 2.5V). This enables seamless interfacing between mixed-voltage subsystems without external level shifters.

How does collision detection work in the 70T3399S166BC, and what is its timing behavior?

The 70T3399S166BC asserts COLL or COLR within 4.2ns of detecting simultaneous write operations to the same memory location from both ports. The collision flag remains asserted until cleared by a subsequent non-conflicting access or reset. This hardware-level detection eliminates software polling overhead and enables deterministic recovery sequences in real-time systems where data coherency is critical.

What is the purpose of the ADS, CNTEN, and REPEAT signals in the 70T3399S166BC?

ADSL/ADSR latches the current address into an internal counter; CNTENL/CNTENR enables automatic increment on each clock cycle; REPEATL/REPEATR resets the counter to the last ADS-loaded address. Together, they implement hardware-assisted burst addressing-reducing address bus traffic in sequential access patterns such as video line buffers or FFT coefficient tables-without consuming CPU cycles or FPGA logic resources.

Can the 70T3399S166BC enter low-power sleep mode, and how is it controlled?

Yes, the 70T3399S166BC supports hardware sleep mode via ZZL and ZZR pins. Asserting either pin high disables dynamic inputs (except JTAG), reducing supply current to ≤15mA. Sleep mode recovery requires three clock cycles (tZZRC), and the device retains all memory contents. This feature is essential for power-gated subsystems in battery-backed or thermally managed applications where periodic memory access is required.