Renesas 70V3399S133PRF8

Overview

70V3399S133PRF8 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 - ideal for real-time packet buffering in telecom line cards and FPGA co-processor data exchange.

For engineers reviewing the 70V3399S133PRF8 datasheet, 70V3399S133PRF8 pinout, 70V3399S133PRF8 application, or 70V3399S133PRF8 equivalent, key selection criteria include its 128-pin TQFP package with pipelined-only output mode, industrial temperature support (–40°C to +85°C), dual chip enable depth expansion capability, and JTAG-disabled configuration due to pin count constraints.

Technical Context

The 70V3399S133PRF8 implements full synchronous operation on both ports with registered address, data, and control inputs - achieving 1.7ns setup and 0.5ns hold times at 133MHz. Its memory array uses true dual-port cells, eliminating arbitration logic and enabling deterministic latency for inter-processor communication.

It features independent port-level power management via dual chip enables (CE0/CE1), separate byte enables (UBL/LBL, UBR/LBR) for 9-bit upper/lower data segmentation, and counter-based address generation with ADS strobe, CNTEN, and REPEAT controls - supporting burst-mode DMA transfers without external address sequencing logic.

Key Specifications

Pinout & Package

70V3399S133PRF8 is packaged in a 128-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 20 mm × 1.4 mm. Pin functions are fully defined in IDT documentation; JTAG and Flow-Through mode are disabled due to pin count limitations - device operates exclusively in pipelined output mode on both ports.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV18 and AS7C3256A, the 70V3399S133PRF8 uniquely balances industrial temperature support, mixed-voltage I/O flexibility, and pipelined latency in a TQFP package - making it optimal for field-upgradable embedded systems where layout reuse and voltage compatibility are mandatory.

Availability

70V3399S133PRF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, avionics data acquisition, and FPGA-based prototyping requiring stable component supply across extended product lifecycles.

Supply support for 70V3399S133PRF8 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 and computing markets.

The 70V3399S133PRF8 belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V3399S133PRF8?

The 70V3399S133PRF8 is rated for 133 MHz operation, corresponding to a 7.5 ns clock cycle time in pipelined mode. This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) and is supported by 4.2 ns clock-to-data-out timing. The device does not support 166 MHz operation - that speed grade applies only to the 70V3399S166 variant.

Does the 70V3399S133PRF8 support Flow-Through output mode?

No, the 70V3399S133PRF8 does not support Flow-Through output mode. Due to pin count limitations in its 128-pin TQFP package, the FT/PIPEL and FT/FTR pins are unimplemented - the device operates exclusively in pipelined output mode on both left and right ports, delivering 4.2 ns clock-to-data-out latency.

Can the left and right ports of the 70V3399S133PRF8 operate at different I/O voltages?

Yes, the 70V3399S133PRF8 supports independent I/O voltage selection per port. OPTL configures the left port for either 3.3 V or 2.5 V I/O signaling, while OPTR performs the same function for the right port. Both ports may operate at the same voltage or at mixed voltages - for example, left port at 3.3 V interfacing to an ASIC and right port at 2.5 V connecting to an FPGA.

Is JTAG debugging supported on the 70V3399S133PRF8?

No, JTAG is not supported on the 70V3399S133PRF8. As explicitly stated in the datasheet notes for the PKG128 package, JTAG functionality (TCK, TMS, TDI, TDO, TRST) is omitted due to insufficient pin count. JTAG is available only on the 208-pin and 256-pin BGA variants of the 70V3399 family.

What is the purpose of the REPEATL and REPEATR pins on the 70V3399S133PRF8?

The REPEATL and REPEATR pins control the address counter's repeat behavior on the left and right ports respectively. When asserted, they reset the internal counter to the last valid address loaded via ADSL or ADSR - enabling circular buffer operation, ping-pong memory access, or re-reading of configuration tables without software intervention. This feature is essential for burst-mode DMA and real-time streaming applications.