Renesas 70V3399S133BCI

Overview

70V3399S133BCI 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 70V3399S133BCI datasheet, 70V3399S133BCI pinout, 70V3399S133BCI application, or 70V3399S133BCI equivalent, this device is selected for deterministic latency-critical dual-processor interconnects, FPGA co-processor memory sharing, and burst-mode packet buffering where concurrent port access, sub-5ns timing, and industrial temperature operation (-40°C to +85°C) are mandatory.

Technical Context

The 70V3399S133BCI implements fully synchronous dual-port operation with registered address, data, and control inputs on both ports-enabling 1.7ns setup and 0.5ns hold times at 133MHz. Its pipelined output mode (fixed on this 128-pin TQFP variant) provides deterministic 4.2ns tCD2 latency, while self-timed write logic maintains fast 7.5ns cycle time without external wait-state generation.

Each port features independent power domains: core VDD = 3.3V ±150mV, while I/O voltage (VDDQ) is configurable to 3.3V or 2.5V via dedicated OPTL/OPTR pins-allowing mixed-voltage system interfacing. Dual chip enables (CE0/CE1 per port) support depth expansion without external logic, and JTAG IEEE 1149.1 is omitted due to pin count constraints in the PKG128 package.

Key Specifications

Pinout & Package

70V3399S133BCI is housed in a 128-pin Thin Quad Flatpack (TQFP) package with 0.5mm pitch, 14mm × 20mm footprint, and 1.4mm height. All VDD pins require 3.3V supply; VDDQL/VDDQR must match OPTL/OPTR configuration (3.3V or 2.5V). A17 is No Connect 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 IDT70V9369S133BG, the 70V3399S133BCI uniquely combines industrial temperature operation, mixed-voltage I/O per port, and compact 128-pin TQFP packaging-making it optimal for space-constrained, mixed-signal embedded systems requiring deterministic dual-port latency.

Availability

70V3399S133BCI is available at Aetrix Electronics and suitable for telecom infrastructure, avionics data concentrators, and medical imaging systems requiring stable component supply across extended product lifecycles.

Supply support for 70V3399S133BCI 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 interface, and RF solutions for communications, computing, and industrial markets.

The 70V33xx family targets deterministic, low-latency memory interfacing in dual-processor and FPGA-ASIC systems-emphasizing simultaneous access, mixed-voltage compatibility, and industrial-grade reliability.

FAQ

What is the maximum guaranteed operating frequency for 70V3399S133BCI?

The 70V3399S133BCI is rated for 133MHz operation across the industrial temperature range (-40°C to +85°C), with a maximum clock cycle time of 7.5ns. This is validated for both commercial and industrial grades, and the device achieves 4.2ns clock-to-data-out (tCD2) in pipelined mode at this frequency. The 166MHz speed grade (70V3399S166) is commercial-only and not applicable to this part number.

Does 70V3399S133BCI support flow-through output mode?

No, the 70V3399S133BCI in the 128-pin TQFP (PKG128) package supports pipelined output mode only. As explicitly stated in the datasheet notes, "PIPE/FT option in PKG128 is not supported due to limitation in pin count. Device is pipelined outputs only on each port." Flow-through mode requires additional pins unavailable in this package variant.

Can both ports of 70V3399S133BCI operate at different I/O voltages?

Yes, the 70V3399S133BCI supports independent I/O voltage selection per port: OPTL configures the left port's VDDQL supply (3.3V or 2.5V), and OPTR configures the right port's VDDQR supply. This allows one port to interface with a 3.3V FPGA bank while the other connects to a 2.5V ASIC-enabling flexible mixed-voltage system integration without level shifters.

Is JTAG debugging supported on 70V3399S133BCI?

No, JTAG is not supported on the 70V3399S133BCI 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." JTAG signals (TCK, TMS, TDI, TDO, TRST) are present only on the 208-pin and 256-pin BGA variants of the 70V3319/99 family.

What is the function of the REPEAT pin on 70V3399S133BCI?

The REPEAT pin on 70V3399S133BCI resets the internal address counter to the last valid address loaded via ADS (Address Strobe Enable). When asserted, it causes the counter to repeat the most recently latched address-enabling efficient burst reads of consecutive locations without continuous address bus updates. This reduces CPU overhead in streaming data applications like packet buffering or image acquisition.