Renesas 70V3389S4BC

Overview

70V3389S4BC from Integrated Device Technology is a high-speed 64K × 18-bit synchronous dual-port static RAM with pipelined output mode, 4.2 ns clock-to-data access (max), 7.5 ns cycle time (133 MHz), and independent 3.3 V or 2.5 V I/O voltage selection per port. It supports simultaneous left/right port access to the same memory location and is used in real-time digital signal processing systems requiring low-latency bidirectional data flow.

For engineers reviewing the 70V3389S4BC datasheet, 70V3389S4BC pinout, 70V3389S4BC application, or 70V3389S4BC equivalent, this page delivers verified timing parameters, dual-port counter control logic, VDDQ voltage configuration rules, and industrial-grade (-40°C to +85°C) thermal validation for synchronous burst-mode memory subsystems.

Technical Context

The 70V3389S4BC implements true dual-port SRAM cells with fully synchronous operation on both ports, using rising-edge clock-triggered registers for address, data, and control inputs. Its self-timed write architecture enables fast cycle times without external timing constraints.

Each port features independent OPT pins to select 3.3 V or 2.5 V I/O interface levels, with corresponding VDDQL/VDDQR supplies. The address counter-enabled by CNTENL/CNTRSTL (left) and CNTENR/CNTRSTR (right)-operates asynchronously to CE/R/W and allows automatic sequential addressing during pipelined read/write sequences.

Key Specifications

Pinout & Package

70V3389S4BC is packaged in a 256-pin Ball Grid Array (BC256/BCG256), 17 mm × 17 mm body, 1.0 mm ball pitch, with exposed thermal pad. All VDD pins require 3.3 V supply; VDDQL/VDDQR must match OPTL/OPTR logic state (VIH → 3.3 V, VIL → 2.5 V); all VSS pins tied to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-167BZI and AS7C362000B-15JIN, the 70V3389S4BC uniquely combines 4.2 ns pipelined access, per-port 2.5 V/3.3 V I/O selection, and integrated address counters-enabling tighter timing closure and reduced system-level component count in high-performance embedded memory subsystems.

Availability

70V3389S4BC is available at Aetrix Electronics and suitable for telecom line cards, digital signal processors, industrial PLC controllers, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V3389S4BC 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 70V3389S4BC belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered specifically for deterministic-latency, burst-mode memory applications in real-time signal processing and network infrastructure.

FAQ

What is the maximum operating frequency of the 70V3389S4BC?

The 70V3389S4BC supports a 133 MHz clock frequency, derived from its 7.5 ns minimum clock cycle time (tCYC2). This is guaranteed across the commercial temperature range (0°C to +70°C) and validated with 4.2 ns clock-to-data (tCD2) in pipelined mode. Industrial-grade operation at 133 MHz requires verification against the 70V3389S5 variant.

How does the address counter function in the 70V3389S4BC?

The 70V3389S4BC implements independent left- and right-port address counters controlled by CNTENL/CNTRSTL and CNTENR/CNTRSTR. When CNTEN = LOW on a rising CLK edge, the counter advances regardless of CE or R/W state. CNTRST = LOW resets the counter to address 0. This enables automatic sequential access without external address generation logic.

Can the left and right ports of the 70V3389S4BC operate at different I/O voltages?

Yes. The 70V3389S4BC supports independent I/O voltage selection per port: OPTL configures the left port's VDDQL (3.3 V or 2.5 V), and OPTR configures the right port's VDDQR. Both ports may run at 3.3 V, both at 2.5 V, or one at each voltage-enabling flexible integration with heterogeneous logic families.

What is the purpose of the dual chip enables (CE0 and CE1) on the 70V3389S4BC?

The dual chip enables (CE0L/CE1L and CE0R/CE1R) allow depth expansion of multiple 70V3389S4BC devices without external logic. For example, CE0L = LOW + CE1L = HIGH activates the left port, while CE0L = HIGH + CE1L = LOW places it in low-power standby. This pairing simplifies memory banking in large-capacity systems.

Does the 70V3389S4BC support asynchronous output enable?

Yes. The 70V3389S4BC includes asynchronous OEL and OER signals that override output state independently of the clock. When OE = HIGH, outputs go high-impedance immediately-even mid-cycle-facilitating clean bus sharing in asynchronous system architectures without timing penalties.