Renesas IDT70T3319S133DD

Overview

IDT70T3319S133DD from Integrated Device Technology is a high-speed 256K × 18-bit synchronous dual-port static RAM with true dual-port architecture, 2.5V core supply, and selectable 2.5V/3.3V I/O interface per port. It supports 133MHz operation (7.5ns cycle time in pipelined mode), industrial temperature range (–40°C to +85°C), and features pipelined/flow-through output modes, dual chip enables, interrupt/collision flags, and JTAG IEEE 1149.1 compliance - deployed in real-time DSP inter-processor communication and FPGA-to-FPGA bridging systems.

For engineers reviewing the IDT70T3319S133DD datasheet, IDT70T3319S133DD pinout, IDT70T3319S133DD application, or IDT70T3319S133DD equivalent, key selection criteria include simultaneous left/right port access timing, VDDQ voltage configuration per port, sleep mode current (5–20mA), pipelined read latency (4.2ns max), and BGA package compatibility with depth expansion logic.

Technical Context

This device implements fully synchronous dual-port SRAM architecture with independent clock domains per port (CLKL/CLKR), register-controlled address/data/control inputs enabling tight setup/hold margins (1.5ns setup, 0.5ns hold). Each port supports configurable I/O voltage via dedicated OPTL/OPTR pins, allowing mixed-voltage system integration without level shifters.

It integrates on-chip address counter with ADS/CNTEN/REPEAT control, collision detection logic between ports, and dual-cycle deselect (DCD) for pipelined output mode. The memory array uses true dual-port cells enabling concurrent read/write to same location - critical for lock-free inter-processor data exchange in telecom baseband subsystems.

Key Specifications

Pinout & Package

Available in 256-pin Ball Grid Array (BGA) package, body size 17mm × 17mm × 1.4mm, 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 CY7C1362BV33-133AXC and AS7C33256A-133BIN, the IDT70T3319S133DD uniquely delivers 2.5V core + selectable I/O voltage, industrial temperature rating, and hardware collision detection - making it the only viable option for deterministic, low-power, mixed-voltage dual-processor interconnects.

Availability

IDT70T3319S133DD is available at Aetrix Electronics and suitable for telecom baseband processing, FPGA-to-FPGA bridging, motor drive controller buffering, and industrial PLC data exchange requiring stable component supply across extended product lifecycles.

Supply support for IDT70T3319S133DD 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, and RF power solutions for communications and computing infrastructure.

The IDT70T33xx family was designed specifically for high-reliability, low-latency inter-processor communication in telecom, industrial automation, and defense electronics - emphasizing deterministic timing, mixed-voltage interoperability, and hardware-assisted concurrency control.

FAQ

What is the maximum operating frequency of the IDT70T3319S133DD in pipelined mode?

The IDT70T3319S133DD supports up to 133MHz operation in pipelined output mode, corresponding to a 7.5ns clock cycle time (tCYC2). This is validated for both commercial and industrial temperature ranges, with guaranteed tCD2 (clock-to-data valid) of 4.2ns maximum. The device achieves this performance using self-timed write and registered control paths, enabling reliable high-speed burst transfers in real-time systems.

Does the IDT70T3319S133DD support mixed-voltage operation between its left and right ports?

Yes, the IDT70T3319S133DD supports 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 with VDDQL = 3.3V, while OPTR held at VSS (0V) sets the right port to 2.5V I/O with VDDQR = 2.5V. This eliminates external level shifters in heterogeneous SoC interconnects, and is explicitly confirmed in the DC Operating Conditions tables for both 2.5V and 3.3V VDDQ configurations.

What is the function of the ZZL and ZZR pins on the IDT70T3319S133DD?

The ZZL and ZZR pins are asynchronous sleep mode controls for the left and right ports respectively. When asserted high (VIH), they disable dynamic inputs (except JTAG signals), reducing current consumption to 5–20mA depending on temperature grade. Static inputs like PL/FTx and OPTx remain functional during sleep, and JTAG remains accessible for debugging. Sleep mode recovery requires three clock cycles (tZZRC), and the feature is validated in the AC Electrical Characteristics table under tZZSC/tZZRC parameters.

How does collision detection work between ports on the IDT70T3319S133DD?

The IDT70T3319S133DD implements hardware collision detection that asserts COLL (left port) or COLR (right port) when both ports attempt to access the same memory location simultaneously. Detection occurs within 4.2ns (tCOLS), and flags remain asserted until cleared by subsequent non-conflicting access. Collision logic operates independently of OE/CE states and is synchronized to each port's clock domain, enabling lock-free arbitration in multi-CPU systems without software polling overhead.

What package type is used for the IDT70T3319S133DD, and what are its mechanical dimensions?

The IDT70T3319S133DD is packaged in a 256-pin Ball Grid Array (BGA) with part code BC256, measuring approximately 17mm × 17mm × 1.4mm with 1.0mm ball pitch. This package is distinct from the 208-pin fpBGA variant (BF208) used in other speed grades. Pin configuration data, including NC assignments (e.g., A18L and A18R are no-connect for IDT70T3319), is fully documented in the official pinout diagram and confirmed in the "Pin Configuration" section of the datasheet.