Renesas 70V3399S133BC

Overview

70V3399S133BC from Integrated Device Technology is a high-speed 256K × 18-bit synchronous dual-port SRAM with true dual-port architecture enabling simultaneous read/write access to the same memory location from independent left and right ports. It operates at 133MHz (7.5ns cycle time), supports selectable 3.3V or 2.5V I/O interfaces per port, and delivers 4.2ns clock-to-data-out in pipelined mode. It is used in real-time packet buffering for telecom line cards requiring deterministic latency and concurrent data path arbitration.

For engineers reviewing the 70V3399S133BC datasheet, 70V3399S133BC pinout, 70V3399S133BC application, or 70V3399S133BC equivalent, key selection criteria include its 133MHz industrial-grade timing (–40°C to +85°C), dual chip enable depth expansion capability, separate byte controls for bus matching, and JTAG-compliant test support - all validated for 128-pin TQFP package implementation.

Technical Context

This device implements full synchronous operation on both ports with registered address, data, and control inputs, enabling minimal setup/hold times (1.7ns setup, 0.5ns hold @133MHz). Its self-timed write architecture maintains fast cycle time without external wait-state logic.

The memory array uses true dual-port cells, and each port features independent counter enable, repeat, and address strobe functions. Pipelined output mode is fixed (no flow-through option) in the 128-pin TQFP package due to pin count constraints, and JTAG is omitted in this package variant.

Key Specifications

Pinout & Package

70V3399S133BC is housed in a 128-pin Thin Quad Flatpack (TQFP) with 0.5mm pitch, body size 14mm × 20mm × 1.4mm. All VDD pins require 3.3V supply; VDDQL/VDDQR must match selected I/O voltage (3.3V or 2.5V) per port based on OPTL/OPTR logic level. A17L and A17R are no-connect (NC) pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV133BXC, 70V3399S133BC provides greater memory depth and advanced addressing features essential for burst-oriented systems; versus AS7C33199S133BPC, it offers identical functionality with established IDT qualification history for mission-critical deployments.

Availability

70V3399S133BC is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, medical imaging, and avionics applications requiring stable component supply, long-term lifecycle support, and industrial temperature assurance.

Supply support for 70V3399S133BC 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 70V33xx family was designed specifically for high-throughput, low-latency dual-access memory applications in network processors, DSP-based systems, and real-time controllers where deterministic timing and concurrent port access are mandatory.

FAQ

What is the maximum operating frequency of the 70V3399S133BC?

The 70V3399S133BC is rated for 133MHz operation across the industrial temperature range (–40°C to +85°C), with a guaranteed 7.5ns minimum clock cycle time and 4.2ns maximum clock-to-data-out delay in pipelined mode. This timing is validated under worst-case voltage (3.15V VDD) and temperature conditions, making it suitable for deterministic real-time systems.

Does the 70V3399S133BC support flow-through output mode?

No, the 70V3399S133BC in the 128-pin TQFP package does not support flow-through output mode. Per the datasheet note on page 4, "PIPE/FT option in PKG128 is not supported due to limitation in pin count. Device is pipelined outputs only on each port." All output timing follows the pipelined specification (tCD2 = 4.2ns max).

Can the left and right ports of the 70V3399S133BC operate at different I/O voltages?

Yes, the 70V3399S133BC supports independent I/O voltage selection per port: OPTL sets the left port's interface voltage (3.3V or 2.5V), and OPTR sets the right port's. Corresponding VDDQL and VDDQR supplies must be configured accordingly. This enables mixed-voltage system integration - for example, connecting the left port to a 2.5V FPGA and the right port to a 3.3V microcontroller.

Is JTAG debugging supported on the 70V3399S133BC in the 128-pin TQFP package?

No, JTAG is not supported on the 70V3399S133BC in the 128-pin TQFP package. As stated in the Pin Configuration notes (page 4), "Due to the limited pin count, JTAG is not supported in the PKG128 package." JTAG signals (TCK, TMS, TDI, TDO, TRST) are omitted from this package variant; they are only available in the 208-pin and 256-pin BGA versions.

What is the function of the ADSL and ADSR pins on the 70V3399S133BC?

The ADSL and ADSR pins are Address Strobe Enable inputs for the left and right ports respectively. When asserted (low), they latch the current address into the internal address counter, enabling auto-incrementing sequential access. Combined with CNTEN and REPEAT, they support burst-mode transfers - for example, loading a block of image data or packet descriptors without software intervention per address.