Renesas 70V3389S4BC8

Overview

70V3389S4BC8 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 access to the same memory location, 4.2 ns clock-to-data access (max), and support for independent 3.3 V or 2.5 V I/O interfaces per port - used in high-bandwidth inter-processor communication and real-time DSP buffering.

For engineers reviewing the 70V3389S4BC8 datasheet, 70V3389S4BC8 pinout, 70V3389S4BC8 application, or 70V3389S4BC8 equivalent, key selection criteria include pipelined read latency, dual-voltage I/O flexibility, counter-enabled burst addressing, industrial-grade timing stability at 133 MHz, and TQFP-128 package compatibility with legacy board layouts.

Technical Context

The 70V3389S4BC8 implements fully synchronous operation on both ports with registered address, data, and control inputs clocked on the rising edge of CLKL/CLKR. Its self-timed write pulse decouples internal write completion from clock edge timing, enabling minimal cycle time.

It supports pipelined output mode (1-cycle latency), address counter mode with ADS/CNTEN/CNTRST control, and independent voltage selection per port via OPTL/OPTR pins - allowing mixed 3.3 V/2.5 V bus interfacing without level shifters.

Key Specifications

Pinout & Package

70V3389S4BC8 is housed in a 128-pin TQFP (PKG128) with 0.5 mm lead pitch, 14 mm × 20 mm footprint, and 1.4 mm height. Pin functions are strictly defined per port (left/right), with dedicated clock, address, data I/O, chip enable, byte enable, and control signals for each side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and AS7C364096B-133BIN, the 70V3389S4BC8 uniquely delivers per-port selectable I/O voltage and guaranteed 4.2 ns pipelined access - making it optimal for mixed-voltage, high-throughput inter-processor links where latency and interface compatibility are co-constrained.

Availability

70V3389S4BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and test equipment applications requiring stable component supply, long-lifecycle support, and commercial-temperature dual-port SRAM with proven 133 MHz performance.

Supply support for 70V3389S4BC8 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 ICs for communications, computing, and industrial markets.

The 70V3389S4BC8 belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where concurrent access and precise timing control are mandatory.

FAQ

What is the maximum operating frequency of the 70V3389S4BC8?

The 70V3389S4BC8 supports a maximum clock frequency of 133 MHz, corresponding to a 7.5 ns clock cycle time in pipelined mode. This is validated for commercial temperature range (0°C to +70°C) and requires proper termination, layout, and power integrity per the datasheet guidelines. The 70V3389S4BC8 achieves this speed using registered inputs and self-timed write architecture.

Does the 70V3389S4BC8 support independent I/O voltage levels on its two ports?

Yes, the 70V3389S4BC8 supports independent I/O voltage selection per port via the OPTL and OPTR pins. Setting OPTL to VIH (3.3 V) configures the left port for 3.3 V I/O operation with VDDQL = 3.3 V, while setting OPTR to VIL (0 V) configures the right port for 2.5 V I/O with VDDQR = 2.5 V. This enables direct interfacing with mixed-voltage FPGAs or ASICs without external level shifters.

How does the address counter function work on the 70V3389S4BC8?

The 70V3389S4BC8 implements an internal address counter controlled by CNTENL/CNTENR and CNTRSTL/CNTRSTR. When CNTEN = VIL on the rising clock edge, the counter increments automatically - enabling burst transfers without updating the address bus. CNTRST asynchronously resets the counter to address 0. This feature is especially valuable in pattern memory and FIFO emulation applications where sequential access dominates.

What package type is used for the 70V3389S4BC8?

The 70V3389S4BC8 is packaged in a 128-pin Thin Quad Flat Package (TQFP), designated PKG128, with dimensions of approximately 14 mm × 20 mm × 1.4 mm and 0.5 mm lead pitch. This package is RoHS-compliant, reflow-solderable, and widely supported in PCB design libraries and assembly processes - offering mechanical robustness and thermal performance suitable for commercial embedded applications.

Can the 70V3389S4BC8 be used in depth-expansion configurations without external logic?

Yes, the 70V3389S4BC8 features dual chip enables (CE0X and CE1X) per port, enabling straightforward depth expansion. For example, two devices can be stacked using shared address/data buses and differentiated CE signals - CE0L=LOW/CE1L=HIGH selects the first device, while CE0L=HIGH/CE1L=LOW selects the second. No additional decoding logic is required, simplifying memory banking in systems requiring >64K × 18 capacity.