Renesas 70V3399S133BC8

Overview

70V3399S133BC8 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. Designed for real-time data buffering in telecom line cards and packet-switching fabric controllers.

For engineers reviewing the 70V3399S133BC8 datasheet, 70V3399S133BC8 pinout, 70V3399S133BC8 application, or 70V3399S133BC8 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 this TQFP variant), and independent VDDQ voltage selection per port via OPTL/OPTR pins.

Technical Context

This device 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 internal architecture includes dual address counters with ADS strobe, CNTEN enable, and REPEAT latch functionality for burst sequential addressing without external logic.

The 70V3399S133BC8 uses LVTTL-compatible signaling with separate VDDQ supplies (3.3V ±150mV or 2.5V ±100mV) per port, controlled independently by OPTL and OPTR pins. JTAG boundary-scan (IEEE 1149.1) is omitted due to 128-pin TQFP pin count limitations, and A17 is no-connect on both ports as confirmed in pin tables.

Key Specifications

Pinout & Package

70V3399S133BC8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package with 0.5 mm pitch, 14 mm × 20 mm footprint, and 1.4 mm height. All VDD pins require 3.3V supply; VDDQL/VDDQR must match OPTL/OPTR logic levels (3.3V if VIH, 2.5V if VIL). A17L and A17R are no-connects.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362KV18-133BZC and AS7C3256A-133JCIN, the 70V3399S133BC8 uniquely provides per-port 2.5V/3.3V I/O selection in a 128-pin TQFP, making it optimal for heterogeneous voltage domain interfacing without layout change penalties of BGA packages.

Availability

70V3399S133BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and network equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V3399S133BC8 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 solutions for communications and computing markets.

The 70V33xx family was engineered specifically for high-bandwidth, low-latency dual-access memory applications in telecom switching, networking ASICs, and real-time embedded systems demanding deterministic timing and industrial reliability.

FAQ

What is the maximum operating frequency of the 70V3399S133BC8, and under what conditions is it guaranteed?

The 70V3399S133BC8 is rated for 133MHz operation (7.5ns cycle time) across the full industrial temperature range (–40°C to +85°C) with VDD = 3.3V ±150mV. This specification is validated per AC Electrical Characteristics Table 11 in the datasheet and applies to both ports simultaneously under pipelined output mode, which is the only supported mode for the 128-pin TQFP package.

Does the 70V3399S133BC8 support flow-through output mode, and if not, why?

No, the 70V3399S133BC8 does not support flow-through output mode. As explicitly stated in the datasheet (page 4, Note 8), the PIPE/FT option is not supported in the PKG128 (128-pin TQFP) package due to pin count limitations-only pipelined output mode is implemented. This means all data outputs are registered on the clock edge, adding one-cycle latency but improving timing margin.

How does the OPTL and OPTR pin configuration affect I/O voltage operation on the 70V3399S133BC8?

The OPTL and OPTR pins independently configure the I/O voltage level for the left and right ports: VIH (≥2.0V) selects 3.3V operation with VDDQL/VDDQR = 3.3V ±150mV; VIL (≤0.8V) selects 2.5V operation with VDDQL/VDDQR = 2.5V ±100mV. Both ports may operate at different voltages-e.g., left port at 3.3V for an ASIC, right port at 2.5V for an FPGA-enabling mixed-voltage system integration without level shifters.

What is the function of ADSL and ADSR, and how do they interact with CNTENL/CNTENR on the 70V3399S133BC8?

ADSL and ADSR are asynchronous address strobe inputs that latch the current address bus value into the internal address counter. When CNTENL/CNTENR is asserted (VIL), the counter auto-increments on each subsequent CLK rise, enabling burst sequential access. REPEATL/REPEATR resets the counter to the last ADS-latched address-supporting circular buffers or ping-pong memory regions without external address generation logic.

Is JTAG boundary-scan supported on the 70V3399S133BC8, and if not, what are the implications for testability?

No, JTAG boundary-scan (IEEE 1149.1) is not supported on the 70V3399S133BC8. As noted in the datasheet (page 4, Note 9), the 128-pin TQFP package lacks sufficient pins to implement the required TCK, TMS, TDI, TDO, and TRST signals. Testability relies on functional testing via the dual-port interface, requiring dedicated test firmware or external logic to verify signal integrity and memory operation.