Renesas 70V3399S133BCI8

Overview

70V3399S133BCI8 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 70V3399S133BCI8 datasheet, 70V3399S133BCI8 pinout, 70V3399S133BCI8 application, or 70V3399S133BCI8 equivalent, key selection criteria include industrial temperature support (−40°C to +85°C), dual chip enable depth expansion capability, JTAG-compliant test features (not supported in TQFP), and strict 1.7ns address setup timing at 133MHz operation.

Technical Context

This device implements full synchronous operation on both ports with registered address, data, and control inputs - enabling minimal 1.7ns setup and 0.5ns hold times at 133MHz. Its dual-port memory array uses true dual-port cells, not time-multiplexed or pseudo-dual configurations, allowing concurrent access without arbitration logic.

The 70V3399S133BCI8 supports pipelined output mode only (no flow-through option) in its 128-pin TQFP package due to pin count constraints. Each port features independent VDDQ supply (3.3V or 2.5V selectable via OPTL/OPTR pins) and separate byte enables (UBL/LBL, UBR/LBR) for precise bus matching in heterogeneous system interconnects.

Key Specifications

Pinout & Package

70V3399S133BCI8 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 asymmetrically distributed across left (L) and right (R) ports, with dedicated clock, address, data I/O, control, and power terminals per 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 AS7C33256PFSIG, the 70V3399S133BCI8 uniquely supports per-port 2.5V/3.3V I/O selection, industrial temperature operation, and integrated address counter - making it the only option among the three qualified for mixed-voltage, safety-critical, or thermally demanding designs.

Availability

70V3399S133BCI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and avionics data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V3399S133BCI8 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 70V3399S133BCI8 belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency data sharing between independent clock domains in real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V3399S133BCI8?

The 70V3399S133BCI8 is rated for 133 MHz operation (7.5 ns clock cycle time) across the industrial temperature range (−40°C to +85°C). This frequency is guaranteed with pipelined output mode and meets all AC timing specifications including 1.7 ns address setup and 4.2 ns clock-to-data-out (tCD2) under worst-case conditions.

Does the 70V3399S133BCI8 support flow-through output mode?

No, the 70V3399S133BCI8 in its 128-pin TQFP package (denoted by suffix 'B') does not support flow-through output mode. Per datasheet note on page 4, the PIPE/FT option is disabled due to pin count limitations - the device operates exclusively in pipelined output mode on both left and right ports.

Can the left and right ports of the 70V3399S133BCI8 operate at different I/O voltages?

Yes, the 70V3399S133BCI8 supports independent I/O voltage selection per port: OPTL configures VDDQL for the left port (3.3V or 2.5V), and OPTR configures VDDQR for the right port. This enables mixed-voltage interfacing - for example, connecting the left port to a 2.5V FPGA core and the right port to a 3.3V microcontroller bus.

Is JTAG debugging supported on the 70V3399S133BCI8?

JTAG (IEEE 1149.1) is not supported on the 70V3399S133BCI8 because it uses the 128-pin TQFP package (PKG128), which lacks sufficient pins for TDI, TDO, TCK, TMS, and TRST signals. JTAG is only available on the 208-pin and 256-pin BGA variants of the 70V3319/99 family.

What is the function of the REPEAT and CNTEN pins on the 70V3399S133BCI8?

The CNTEN pin enables the internal address counter on each port, advancing the address on every clock cycle when asserted. The REPEAT pin resets the counter to the last valid address loaded via ADS, enabling burst sequential access without external address generation - a key feature for DMA-like operations in the 70V3399S133BCI8.