Renesas 70V3389S5BCI8

Overview

70V3389S5BCI8 from Integrated Device Technology is a high-speed 64K × 18-bit synchronous dual-port static RAM with pipelined output, true dual-port architecture enabling simultaneous read/write access to the same memory location, 5 ns max clock-to-data access (industrial grade), and support for independent 3.3 V or 2.5 V I/O interfaces per port - used in real-time digital signal processing, FPGA co-processor buffering, and high-throughput packet switching systems.

For engineers reviewing the 70V3389S5BCI8 datasheet, 70V3389S5BCI8 pinout, 70V3389S5BCI8 application, or 70V3389S5BCI8 equivalent, key selection considerations include pipelined latency timing (tCD2 = 5 ns max), dual-voltage I/O flexibility (VDDQ = 2.5 V/3.3 V per port), industrial temperature operation (–40°C to +85°C), and depth-expansion capability via dual chip enables (CE0/CE1).

Technical Context

The 70V3389S5BCI8 implements fully synchronous dual-port operation on both left and right ports, with all control, address, and data inputs registered on the rising edge of CLKL/CLKR. Its self-timed write pulse decouples internal write timing from clock edge transitions, enabling minimal cycle time (tCYC2 = 10 ns min, 100 MHz effective).

It integrates independent address counters per port with ADS, CNTEN, and CNTRST controls, supporting external address loading or automatic sequential addressing - critical for burst-mode FIFO emulation and DMA buffer management. Byte enable logic (UBL/LBL, UBR/LBR) provides 9-bit granularity for multiplexed bus compatibility and partial-word writes.

Key Specifications

Pinout & Package

70V3389S5BCI8 is packaged in a 256-pin Ball Grid Array (BCG256), 17 mm × 17 mm body, 1.0 mm ball pitch, with dedicated power/ground distribution (24× VDD, 28× VSS, 4× VDDQL, 4× VDDQR) and symmetrical dual-port I/O layout (I/O0L–I/O17L and I/O0R–I/O17R).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-5BC and AS7C364098B-10BIN, the 70V3389S5BCI8 uniquely delivers 5 ns pipelined access, per-port 2.5 V/3.3 V I/O selection, and integrated address counters - making it the only option for high-frequency, mixed-voltage, burst-oriented dual-port memory systems.

Availability

70V3389S5BCI8 is available at Aetrix Electronics and suitable for FPGA co-processor buffering, telecom packet switching, and industrial motion control applications requiring stable component supply, long-term lifecycle assurance, and industrial-grade thermal performance.

Supply support for 70V3389S5BCI8 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 high-performance timing, memory interface, and RF power solutions for communications and computing infrastructure.

The 70V3389 product line was designed specifically for low-latency, high-bandwidth dual-access memory requirements in networking, test equipment, and real-time embedded systems - emphasizing pipelined timing, voltage flexibility, and industrial reliability.

FAQ

What is the guaranteed clock-to-data access time for 70V3389S5BCI8 in industrial temperature range?

The 70V3389S5BCI8 guarantees a maximum clock-to-data valid time (tCD2) of 5 ns across the full industrial temperature range (–40°C to +85°C) in pipelined mode, as specified in Table 11 of the official datasheet. This parameter is validated during production testing and applies to both ports under worst-case voltage and temperature conditions. The 70V3389S5BCI8 achieves this with its registered input architecture and self-timed write pulse, ensuring deterministic timing behavior in real-time systems.

Can the left and right ports of 70V3389S5BCI8 operate at different I/O voltages simultaneously?

Yes, the 70V3389S5BCI8 supports independent I/O voltage selection per port: OPTL sets the left port's VDDQL (2.5 V or 3.3 V), and OPTR sets the right port's VDDQR (2.5 V or 3.3 V). This allows the left port to interface with a 2.5 V FPGA I/O bank while the right port connects to a 3.3 V microcontroller - eliminating external level shifters. The 70V3389S5BCI8 datasheet explicitly confirms this capability in Tables 5a/5b and Note 2 on page 5.

Does 70V3389S5BCI8 support depth expansion without external logic?

Yes, the 70V3389S5BCI8 includes dual chip enables (CE0X and CE1X) per port, enabling direct depth expansion - for example, stacking two devices to create a 128K × 18 memory - without external address decoding logic. As shown in Figure 4 of the datasheet, CE0 and CE1 are used in complementary pairs (e.g., CE0L = LOW + CE1L = HIGH enables left port), allowing simple bank selection via shared control lines. This feature is intrinsic to the 70V3389S5BCI8 silicon design.

What is the function of ADSL and ADSR in 70V3389S5BCI8?

ADSL (Address Strobe Left) and ADSR (Address Strobe Right) control whether the current clock cycle loads an external address (ADSL = LOW) or advances the internal address counter (ADSL = HIGH). When ADSL = LOW, the A0L–A15L inputs are latched on the next CLKL rising edge; when ADSL = HIGH and CNTENL = LOW, the counter increments automatically. This dual-mode addressing is documented in Truth Table II (page 6) and timing diagrams on pages 13–14 of the 70V3389S5BCI8 datasheet.

Is 70V3389S5BCI8 qualified for industrial temperature operation?

Yes, the "I" suffix in 70V3389S5BCI8 denotes industrial temperature qualification (–40°C to +85°C), confirmed in the Ordering Information section (page 16) and Recommended Operating Conditions table (page 6). All AC and DC specifications - including tCD2 = 5 ns max, ISB3 ≤ 30 mA, and VIH/VIL thresholds - are guaranteed across this full range. The "BCI8" package code further specifies the 256-pin BGA variant rated for industrial use.