Renesas IDT70T3319S133DDI

Overview

IDT70T3319S133DDI 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, selectable 2.5V/3.3V I/O interface per port, and industrial-grade operation up to 133MHz (4.2ns access time). It enables simultaneous read/write access to the same memory location from independent left and right ports-ideal for real-time inter-processor communication in telecom line cards and packet buffering systems.

For engineers reviewing the IDT70T3319S133DDI datasheet, IDT70T3319S133DDI pinout, IDT70T3319S133DDI application, or IDT70T3319S133DDI equivalent, key selection criteria include pipelined vs. flow-through output mode timing, dual chip enable depth expansion capability, JTAG-compliant boundary scan support, and independent port voltage configuration via OPTL/OPTR pins.

Technical Context

This device implements fully synchronous dual-port SRAM architecture with separate address, data, and control registers on both ports-enabling 1.5ns setup and 0.5ns hold times at 200MHz operation. Each port features independent clock (CLKL/CLKR), read/write (R/WL/R/WR), chip enables (CE0L/CE1L, CE0R/CE1R), byte enables (UBL/LBL, UBR/LBR), and pipeline/flow-through mode selection (PL/FTL/PL/FTR).

It integrates collision detection (COLL/COLR) and interrupt flags (INTL/INTR), address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and repeat logic (REPEATL/REPEATR) for burst addressing. Sleep mode (ZZL/ZZR) reduces current to 5mA while preserving JTAG accessibility and static input functionality.

Key Specifications

Pinout & Package

Package: 256-ball BGA (BC256), 17 mm × 17 mm × 1.4 mm, 1.0 mm pitch. All VDD pins require 2.5 V; VDDQ pins must match OPT pin state (2.5 V if OPT = VSS, 3.3 V if OPT = VDD).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and R1EX24016AS0C0I#U0, IDT70T3319S133DDI delivers unique value through per-port voltage flexibility, hardware collision arbitration, IEEE 1149.1 testability, and sub-5ns pipelined access-making it optimal for high-reliability, mixed-voltage, real-time systems.

Availability

IDT70T3319S133DDI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics data concentrators, and medical imaging systems requiring stable component supply across extended product lifecycles.

Supply support for IDT70T3319S133DDI 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 high-performance silicon solutions for communications, computing, and industrial markets.

IDT70T3319S133DDI belongs to the 70T33xx family of high-speed synchronous dual-port SRAMs designed specifically for low-latency, deterministic inter-processor communication in mission-critical embedded systems.

FAQ

What is the maximum operating frequency of the IDT70T3319S133DDI?

The IDT70T3319S133DDI is rated for 133 MHz operation in industrial temperature range (−40°C to +85°C), delivering a 7.5 ns clock cycle time in pipelined mode. Its AC specifications guarantee 4.2 ns clock-to-data valid (tCD2) and 1.5 ns address setup time (tSA) under these conditions. The device supports higher speeds (up to 200 MHz) in commercial grade variants, but IDT70T3319S133DDI is specifically qualified for 133 MHz industrial use.

Does the IDT70T3319S133DDI support independent voltage configuration on each port?

Yes, the IDT70T3319S133DDI supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VDD (2.5 V) configures the left port for 3.3 V I/O levels with VDDQL = 3.3 V, while OPTR = VSS (0 V) sets the right port to 2.5 V I/O with VDDQR = 2.5 V. This allows seamless interfacing with mixed-voltage SoCs and legacy peripherals without external level shifters.

How does the collision detection feature work in the IDT70T3319S133DDI?

The IDT70T3319S133DDI asserts COLL (left port) or COLR (right port) when both ports attempt simultaneous access to the same memory address. These open-drain flags are synchronized to the respective port's clock and can trigger external arbitration logic or CPU interrupts. The tCOLS parameter guarantees detection within 4.2 ns of the violating access, enabling deterministic resolution in real-time systems.

What package type is used for the IDT70T3319S133DDI?

IDT70T3319S133DDI uses a 256-ball BGA package (package code BC256), measuring 17 mm × 17 mm × 1.4 mm with 1.0 mm ball pitch. It is RoHS-compliant and designated as a "green" part. Pin assignments follow the standard 70T33xx layout, with NC pins including A18L, A18R, and several reserved balls per the datasheet pinout diagram.

Can the IDT70T3319S133DDI operate in sleep mode while maintaining JTAG functionality?

Yes, asserting ZZL and/or ZZR places the corresponding port into sleep mode, reducing dynamic current to 5 mA (Izz), while preserving JTAG functionality (TCK, TMS, TDI, TDO, TRST remain active). Static inputs-including PL/FTx, OPTx, and the ZZ pins themselves-are unaffected. Boundary scan operations are recommended outside sleep mode per datasheet guidance, but JTAG pins remain electrically accessible.