Renesas 7134SA55CB

Overview

7134SA55CB from Renesas Electronics is a high-speed 4K × 8 dual-port static RAM with independent asynchronous ports, 55 ns maximum read cycle time, TTL-compatible 5 V ±10% operation, and military-grade temperature range (–55°C to +125°C). It enables concurrent read/write access in real-time systems such as radar signal processors and avionics data buffers.

For engineers reviewing the 7134SA55CB datasheet, 7134SA55CB pinout, 7134SA55CB application, or 7134SA55CB equivalent, key selection criteria include dual-port arbitration-free operation, 55 ns access timing, SB48 sidebraze DIP package compatibility, and MIL-PRF-38535 QML compliance for harsh-environment deployment.

Technical Context

The 7134SA55CB implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port-no on-chip arbitration logic required. Each port features independent chip enable (CEL/CER), output enable (OEL/OER), and read/write (R/WL/R/WR) controls, enabling external contention management.

It supports battery backup data retention only in LA variants; the SA variant prioritizes speed and standard power consumption (700 mW active, 5 mW standby). Fabricated in CMOS, it operates across –55°C to +125°C with 5 V ±10% supply and meets MIL-PRF-38535 QML Class V requirements.

Key Specifications

Pinout & Package

7134SA55CB is housed in a 48-pin sidebraze DIP (SB48) package with 0.62″ × 2.43″ footprint and 0.15″ height. All VCC and GND pins must be externally decoupled per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 7134SA55CB, the 7134SA45CB delivers faster access for latency-sensitive signal chains, while 7134SA55L48B provides identical timing in a surface-mount ceramic package-enabling trade-offs between board assembly method and thermal robustness without redesigning memory interface logic.

Availability

7134SA55CB is available at Aetrix Electronics and suitable for radar signal processing, avionics data buffering, and electronic warfare front-ends requiring stable component supply across extended lifecycle programs.

Supply support for 7134SA55CB 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and aerospace markets.

The IDT7134 family-including 7134SA55CB-was designed for high-reliability dual-port memory applications demanding deterministic timing, military-grade environmental resilience, and TTL-level interoperability in safety-critical systems.

FAQ

What is the operating temperature range for the 7134SA55CB?

The 7134SA55CB is rated for –55°C to +125°C and qualified per MIL-PRF-38535 QML Class V. This makes it suitable for deployment in extreme environments such as aircraft flight decks, missile guidance sections, and ground-based radar shelters where thermal cycling and long-term reliability are critical. Its SB48 sidebraze DIP package enhances thermal dissipation and mechanical stability across this full military temperature range.

Does the 7134SA55CB support battery backup data retention?

No, the 7134SA55CB does not support battery backup data retention. That feature is exclusive to the LA variant (e.g., 7134LA55CB). The "SA" designation indicates Standard Power operation, optimized for speed and active power efficiency (700 mW typical), whereas LA variants add 2 V data retention capability at the cost of slightly higher standby current. Always verify part number suffixes when selecting for low-voltage retention requirements.

What package type is used for the 7134SA55CB?

The 7134SA55CB uses a 48-pin sidebraze DIP (SB48) package-a hermetically sealed ceramic dual-inline package measuring approximately 0.62″ × 2.43″ × 0.15″. This package provides superior thermal conductivity, moisture resistance, and mechanical ruggedness compared to plastic DIPs, aligning with its intended use in military and aerospace applications where long-term reliability under shock, vibration, and wide temperature swings is essential.

How does the 7134SA55CB handle simultaneous access to the same memory location from both ports?

The 7134SA55CB does not include on-chip arbitration logic, so simultaneous access to the same memory address from both ports results in undefined data and potential bus contention. It is the system designer's responsibility to implement external arbitration-such as using semaphores or priority encoders-to ensure only one port accesses a given location at a time. The device's truth table and timing diagrams assume controlled, non-contention operation for reliable data integrity.

Is the 7134SA55CB pin-compatible with other speed grades in the IDT7134SA family?

Yes, all IDT7134SA variants-including 7134SA20CB, 7134SA25CB, 7134SA35CB, 7134SA45CB, 7134SA55CB, and 7134SA70CB-share identical pinouts and package footprints when using the same package code (e.g., SB48). This allows drop-in replacement across speed grades without PCB redesign, provided timing constraints and thermal limits of the target application are met for the selected speed bin.