Renesas 70V3319S133PRFI8

Overview

70V3319S133PRFI8 from Integrated Device Technology (IDT) is a high-speed, synchronous dual-port static RAM with 256K × 18-bit organization (4.5 Mbit), designed for simultaneous read/write access across independent left and right ports in real-time inter-processor or FIFO buffer applications. It operates at 133 MHz (7.5 ns cycle time), supports selectable 3.3 V or 2.5 V I/O interfaces per port, and features pipelined output mode only (no flow-through due to TQFP pin count limitation).

For engineers reviewing the 70V3319S133PRFI8 datasheet, 70V3319S133PRFI8 pinout, 70V3319S133PRFI8 application, or 70V3319S133PRFI8 equivalent, key selection criteria include its industrial-grade temperature range (–40°C to +85°C), dual chip enable architecture for depth expansion, JTAG-compliant test support (excluded in this TQFP variant), and strict 1.7 ns address setup / 0.5 ns hold timing at 133 MHz.

Technical Context

This device implements true dual-port SRAM cells with fully synchronous operation on both ports, using input registers for address, data, and control signals to minimize setup/hold requirements. Its clock-to-data-out latency is 4.2 ns (max) in pipelined mode, enabling 6 Gbps aggregate bandwidth (133 MHz × 18 bits × 2 ports).

The 70V3319S133PRFI8 integrates independent counter-enable and repeat-address logic per port, allowing burst-mode sequential addressing without external counters. Power management includes dual chip enables (CE0/CE1) that place each port into low-power standby independently, with full standby current as low as 15 mA (typ) when both ports are deselected.

Key Specifications

Pinout & Package

70V3319S133PRFI8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package (PKG128), measuring approximately 14 mm × 20 mm × 1.4 mm. All VDD pins require connection to 3.3 V; VDDQL and VDDQR must match the voltage selected by OPTL and OPTR (3.3 V if OPT = VIH, 2.5 V if OPT = VIL). JTAG is not supported in this package due to pin count limitation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133BZI and AS7C3256B-133JIN, the 70V3319S133PRFI8 uniquely delivers industrial temperature operation in a 128-pin TQFP while supporting per-port 2.5 V/3.3 V I/O selection - eliminating level shifters in mixed-voltage embedded systems without requiring BGA rework.

Availability

70V3319S133PRFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V3319S133PRFI8 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 70V3319S133PRFI8 belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered for deterministic, low-latency inter-processor communication in real-time embedded systems where concurrent access and voltage flexibility are critical.

FAQ

What is the maximum operating frequency of the 70V3319S133PRFI8?

The 70V3319S133PRFI8 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 under specified supply conditions (VDD = 3.3 V ±150 mV). The device does not support 166 MHz operation - that speed grade is exclusive to the commercial-only 70V3319S166 variant.

Does the 70V3319S133PRFI8 support flow-through output mode?

No, the 70V3319S133PRFI8 in the 128-pin TQFP package (PKG128) supports pipelined output mode only. Flow-through mode is disabled due to insufficient pin count to implement the FT/PIPE control signal per port. This is explicitly stated in the datasheet notes for PKG128: "PIPE/FT option in PKG128 is not supported due to limitation in pin count. Device is pipelined outputs only on each port."

Can the left and right ports of the 70V3319S133PRFI8 operate at different I/O voltages?

Yes. The 70V3319S133PRFI8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VIH configures the left port for 3.3 V I/O (requiring VDDQL = 3.3 V), while setting OPTR = VIL configures the right port for 2.5 V I/O (requiring VDDQR = 2.5 V). This enables mixed-voltage system integration without external level-shifting circuitry.

What is the purpose of the CNTEN and REPEAT signals on the 70V3319S133PRFI8?

CNTEN (counter enable) and REPEAT (repeat address) provide hardware-accelerated sequential addressing. When CNTEN is asserted, the internal address counter advances on each clock edge. REPEAT resets the counter to the last valid address loaded via ADS (address strobe), enabling efficient burst transfers - for example, streaming pixel data or sensor samples without software-managed address incrementing. Both signals are port-specific (CNTENL/REPEATL and CNTENR/REPEATR).

Is JTAG boundary scan supported on the 70V3319S133PRFI8?

No, JTAG is not supported on the 70V3319S133PRFI8 in the 128-pin TQFP package. The datasheet explicitly states: "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package" and "JTAG is not supported in the PKG128 package." JTAG functionality (TCK, TMS, TDI, TDO, TRST) is only available on the 208-pin and 256-pin BGA variants of the 70V3319/99 family.