Renesas 70V3379S4BF8

Overview

70V3379S4BF8 from Integrated Device Technology is a high-speed 32K × 18-bit synchronous dual-port static RAM with pipelined output, true dual-port architecture enabling simultaneous left/right port access to the same memory location, 7.5 ns cycle time (133 MHz), and selectable 3.3 V or 2.5 V I/O interface per port. It supports industrial temperature range (–40°C to +85°C) and is used in real-time packet buffering for telecom line cards.

For engineers reviewing the 70V3379S4BF8 datasheet, 70V3379S4BF8 pinout, 70V3379S4BF8 application, or 70V3379S4BF8 equivalent, key selection criteria include pipelined read latency, independent port voltage configuration via OPTL/OPTR, counter-enabled burst addressing, dual chip enable for depth expansion, and low-power standby modes controlled by CE0/CE1.

Technical Context

The 70V3379S4BF8 implements fully synchronous operation on both ports using rising-edge clocked registers for address, data, and control inputs - minimizing setup/hold requirements (1.8 ns setup, 0.7 ns hold @133 MHz). Its self-timed write pulse decouples internal write timing from clock edge transitions, enabling consistent fast cycle performance regardless of clock duty cycle.

Each port features independent address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and counter reset (CNTRSTL/CNTRSTR) logic, allowing autonomous address generation or external address loading. Byte enables (UBL/LBL and UBR/LBR) support 9-bit-wide data masking per port, critical for multiplexed bus compatibility and partial-word writes.

Key Specifications

Pinout & Package

70V3379S4BF8 is packaged in a 208-pin fine-pitch Ball Grid Array (fpBGA, package code BF208), body size 17 mm × 17 mm × 1.4 mm, 1.0 mm ball pitch. All VDD pins require 3.3 V supply; VDDQL/VDDQR must match OPTL/OPTR logic levels (3.3 V if OPT = VIH, 2.5 V if OPT = VIL); all VSS pins connect to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1375D-133AXC and R1EX24032AS0C0I#, the 70V3379S4BF8 uniquely delivers industrial temperature support, per-port selectable I/O voltage, and integrated address counter - making it the only option for ruggedized, mixed-voltage, burst-oriented dual-port memory systems.

Availability

70V3379S4BF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70V3379S4BF8 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, computing, and industrial markets.

The 70V3379S4BF8 belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for real-time, low-latency data exchange between independent processing domains in networking and control systems.

FAQ

What is the maximum operating frequency supported by the 70V3379S4BF8?

The 70V3379S4BF8 supports a minimum clock cycle time of 7.5 ns, corresponding to a maximum operating frequency of 133 MHz in pipelined mode. This is confirmed in the AC Electrical Characteristics table (Table 11) for the "70V3379S4" speed grade under commercial temperature conditions. The device achieves this while maintaining 4.2 ns clock-to-data access time and 1.8 ns input setup time.

Does the 70V3379S4BF8 support independent voltage operation on its left and right ports?

Yes, the 70V3379S4BF8 supports independent I/O voltage selection per port via the OPTL and OPTR pins. Setting OPTL to VIH (3.3 V) configures VDDQL for 3.3 V operation, while setting it to VIL (0 V) configures VDDQL for 2.5 V. The same applies to OPTR and VDDQR. This allows the left port to interface with a 2.5 V FPGA bank while the right port connects to a 3.3 V microcontroller - without external level shifters.

How does the address counter function in the 70V3379S4BF8, and what signals control it?

The 70V3379S4BF8 includes independent address counters for each port, controlled by ADSL/ADSR (address strobe), CNTENL/CNTENR (counter enable), and CNTRSTL/CNTRSTR (counter reset). When ADS = HIGH and CNTEN = LOW on a CLK rise, the counter advances automatically. When ADS = LOW, the external address is loaded. CNTRST asynchronously resets the counter to zero - enabling precise frame-aligned burst access in packet processing applications.

What power-saving features does the 70V3379S4BF8 provide, and how are they activated?

The 70V3379S4BF8 offers multiple power-saving modes: full standby (ISB3 = 6 mA typ.) activates when both CE0 and CE1 are held at CMOS-invalid levels (>VDDQ−0.2 V or <0.2 V); partial standby (ISB2 = 190 mA typ.) engages when one port is enabled and the other disabled; and dynamic current scales with frequency (e.g., 285 mA typ. at 133 MHz). These are controlled solely by CE0/CE1 logic states - no additional registers or commands are needed.

Is the 70V3379S4BF8 pin-compatible with other members of the IDT70V33xx family, such as the 70V3389 or 70V3399?

No, the 70V3379S4BF8 is not pin-compatible with the 70V3389 (64K × 18) or 70V3399 (128K × 18) in the same package. Although all three share the BF208 fpBGA footprint, the 70V3389 and 70V3399 repurpose pins previously marked NC on the 70V3379S4BF8 (e.g., pins 96 and 99 become VSS). Migration requires PCB layout revision - the 70V3379S4BF8 must be treated as a discrete, non-upgradeable part in new designs.