Renesas 7134SA25J8

Overview

7134SA25J8 from Renesas Electronics is a high-speed 4K × 8 dual-port static RAM with independent asynchronous left/right ports, 25 ns maximum access time (industrial grade), TTL-compatible 5V ±10% operation, and 48-pin PLCC packaging. It enables real-time inter-processor communication in embedded control systems requiring zero-wait-state memory arbitration.

For engineers reviewing the 7134SA25J8 datasheet, 7134SA25J8 pinout, 7134SA25J8 application, or 7134SA25J8 equivalent, this page delivers verified timing specs, industrial-grade DC/AC electrical characteristics, dual-port contention management guidance, and package-specific layout notes for reliable integration into avionics data buffers and industrial PLC co-processor modules.

Technical Context

The 7134SA25J8 implements fully asynchronous dual-port architecture with separate address, control, and 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 concurrent but externally managed access to the same 32-Kbit memory array.

It supports industrial temperature operation (–40°C to +85°C), consumes 75 mA typical dynamic current (both ports active), and enters low-power standby (ISB2 = 75 mA typ.) when one port's CE is deasserted. Battery backup data retention at 2 V is not supported-this is the SA (standard power) variant, not LA.

Key Specifications

Pinout & Package

7134SA25J8 is supplied in a 52-pin Plastic Leaded Chip Carrier (PLCC, package code PLG52), body size ≈ 0.75 in × 0.75 in × 0.17 in, with J-lead configuration and pin 1 index marker. All V_CC and GND pins must be properly decoupled per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C135-25JC and AS7C34098-25JI, the 7134SA25J8 uniquely combines industrial temperature rating, true independent R/W control per port, and Renesas' MIL-PRF-38535 QML-compliant manufacturing traceability-making it the preferred choice for safety-critical embedded systems where long-term supply continuity and process rigor are mandatory.

Availability

7134SA25J8 is available at Aetrix Electronics and suitable for industrial PLC co-processor buffers, aerospace avionics data exchange, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.

Supply support for 7134SA25J8 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The IDT7134 family-including 7134SA25J8-was designed for high-reliability dual-ported memory applications demanding deterministic timing, external arbitration flexibility, and extended temperature resilience in mission-critical embedded systems.

FAQ

What is the maximum operating temperature range for the 7134SA25J8?

The 7134SA25J8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per Renesas' industrial-grade qualification standards and applies across all DC and AC electrical parameters in the datasheet. The 7134SA25J8 does not support military (–55°C to +125°C) or commercial (0°C to +70°C) grades-its orderable part number suffix 'I' confirms industrial qualification. Always verify ambient and junction temperature margins in your final thermal design.

Does the 7134SA25J8 support battery backup data retention?

No, the 7134SA25J8 does not support battery backup data retention. That capability is exclusive to the LA (low-power) variant-e.g., 7134LA25JGI-whose datasheet specifies V_DR ≥ 2.0 V and ICCDR ≤ 4000 µA. The 'SA' in 7134SA25J8 denotes standard power consumption (700 mW typical active), and its DC characteristics tables omit all data retention parameters. For battery-backed applications, select an LA-suffixed part with matching speed and package.

What package type is used for the 7134SA25J8?

The 7134SA25J8 uses a 52-pin Plastic Leaded Chip Carrier (PLCC) package, designated PLG52 in Renesas' ordering nomenclature. Its physical dimensions are approximately 0.75 in × 0.75 in × 0.17 in, with J-leads and a pin-1 index marker. This surface-mount package offers superior thermal dissipation and board-area efficiency compared to through-hole DIP variants, and is RoHS-compliant per Renesas' green-part initiative.

How does the 7134SA25J8 handle simultaneous access to the same memory location from both ports?

The 7134SA25J8 places responsibility for data integrity during simultaneous left/right port access entirely on the system designer. It provides no internal arbitration or collision detection-when both ports drive the same address, contention may occur, resulting in undefined data or increased current draw. External arbitration logic (e.g., semaphores or priority encoders) must be implemented to ensure deterministic behavior. The datasheet explicitly states: "It is the user's responsibility to ensure data integrity" under such conditions.

Is the 7134SA25J8 pin-compatible with other members of the IDT7134 family?

Yes, the 7134SA25J8 shares identical pinout and package (PLG52) with all other IDT7134 variants offered in 52-pin PLCC-including 7134LA25JGI and 7134SA55JG. Signal assignments (A0L–A11L, I/O0R–I/O7R, CEL, OER, etc.) are functionally consistent across SA/LA speed grades and temperature grades in this package. However, always confirm voltage tolerances and timing margins match your design requirements, as LA variants exhibit lower standby current and different AC parameter distributions.