Renesas 70V3399S133PRF

Overview

70V3399S133PRF from Integrated Device Technology is a high-speed 256K × 18-bit synchronous dual-port static RAM 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 for real-time data buffering in telecom line cards and packet-switching engines.

For engineers reviewing the 70V3399S133PRF datasheet, 70V3399S133PRF pinout, 70V3399S133PRF application, or 70V3399S133PRF equivalent, key selection criteria include its 133MHz industrial-grade timing (–40°C to +85°C), dual chip-enable depth expansion capability, pipelined output mode only (no flow-through on TQFP), and independent VDDQ/OPT configuration per port for mixed-voltage system interfacing.

Technical Context

The 70V3399S133PRF implements fully synchronous dual-port operation with registered address, data, and control inputs on both ports-enabling minimal 1.7ns setup and 0.5ns hold times at 133MHz. Its memory array uses true dual-port SRAM cells, not pseudo-dual-port or FIFO-based emulation, allowing concurrent access without arbitration logic.

It features independent counter enable (CNTENL/CNTENR) and repeat (REPEATL/REPEATR) functions per port for burst address generation, plus dual-cycle deselect (DCD) support in pipelined mode. JTAG (IEEE 1149.1) is omitted due to 128-pin TQFP pin count constraints, confirming package-specific feature gating.

Key Specifications

Pinout & Package

70V3399S133PRF is packaged in a 128-pin Thin Quad Flatpack (TQFP) with 0.5mm pitch, 14mm × 20mm body, and 1.4mm height. Pin functions are strictly defined per port (left/right), with no shared bidirectional pins-each I/O0L–I/O17L and I/O0R–I/O17R is dedicated to its respective 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 IDT70V9369S133PFI, the 70V3399S133PRF uniquely combines 256K×18 density, per-port 2.5V/3.3V I/O flexibility, and integrated address counter-making it optimal for compact, mixed-voltage, high-throughput embedded buffers requiring autonomous burst handling.

Availability

70V3399S133PRF is available at Aetrix Electronics and suitable for telecom infrastructure, military radar signal processing, and industrial real-time control applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V3399S133PRF 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V3399S133PRF belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency data exchange between asynchronous processing domains in mission-critical infrastructure equipment.

FAQ

What is the maximum operating frequency of the 70V3399S133PRF?

The 70V3399S133PRF is rated for 133MHz operation (7.5ns clock cycle time) across the full industrial temperature range (–40°C to +85°C). This is validated by tCYC2 ≤ 7.5ns and tCD2 ≤ 4.2ns parameters in the datasheet. It does not support 166MHz operation-only the 70V3399S166 variants do. The "133" suffix in the part number explicitly denotes this speed grade.

Does the 70V3399S133PRF support flow-through output mode?

No, the 70V3399S133PRF in the 128-pin TQFP package (PKG128) does not support flow-through output mode. Per 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 timing and functionality assume pipelined mode (tCD2, tCYC2), with no flow-through (tCD1, tCYC1) parameters applicable to this variant.

How is voltage selection implemented for the I/O interfaces on the 70V3399S133PRF?

Voltage selection for each port's I/O interface is controlled independently via OPTL and OPTR pins. Setting OPTL to VIH (3.3V) configures the left port for 3.3V signaling and requires VDDQL = 3.3V; setting it to VIL (0V) configures for 2.5V signaling with VDDQL = 2.5V. The same applies to OPTR/VDDQR. Core VDD remains fixed at 3.3V ±150mV regardless of I/O voltage choice.

What is the purpose of the ADSL and ADSR pins on the 70V3399S133PRF?

ADSL and ADSR (Address Strobe Enable) pins latch the current address into the internal address counter on the rising edge of CLK. When combined with CNTENL/CNTENR, they enable automatic address increment for burst transfers. With REPEATL/REPEATR asserted, the counter resets to the last ADS-loaded address-supporting circular buffer behavior essential for streaming data applications without host CPU intervention.

Can the 70V3399S133PRF operate with different I/O voltages on left and right ports simultaneously?

Yes, the 70V3399S133PRF supports mixed-voltage operation: the left port can be configured for 3.3V I/O (OPTL = VIH, VDDQL = 3.3V) while the right port runs at 2.5V (OPTR = VIL, VDDQR = 2.5V), or vice versa. This is explicitly confirmed in datasheet Note 3 on page 5: "The OPT pins are independent of one another-both ports can operate at 3.3V levels, both can operate at 2.5V levels, or either can operate at 3.3V with the other at 2.5V."