Renesas 7134LA25JI

Overview

7134LA25JI from Renesas Electronics is a high-speed 4K × 8 dual-port static RAM with independent left/right asynchronous ports, 25 ns maximum access time (industrial grade), 1 mW typical standby power, and 2 V data retention capability. It supports TTL-compatible 5 V ±10% operation and is used in real-time inter-processor communication, video frame buffers, and military-grade avionics arbitration systems.

For engineers reviewing the 7134LA25JI datasheet, 7134LA25JI pinout, 7134LA25JI application, or 7134LA25JI equivalent, this page delivers verified technical context, package-specific pin mapping, industrial-temperature DC/AC specifications, battery-backed data retention behavior, and validated alternative parts for dual-port SRAM selection in contention-tolerant embedded architectures.

Technical Context

The 7134LA25JI 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 concurrent but externally managed access to the same 4096 × 8-bit memory array.

It uses CMOS fabrication for low-power operation: active current ≤240 mA (typ. 140 mA), full standby current as low as 0.2 mA (ISB3, CMOS-level CE), and battery backup mode at V_CC = 2 V with ≤4 µA retention current. The device complies with MIL-PRF-38535 QML for military reliability and operates across –40°C to +85°C.

Key Specifications

Pinout & Package

7134LA25JI is supplied in a 52-pin Plastic Leaded Chip Carrier (PLG52) package with 0.050″ lead pitch, 0.75″ × 0.75″ body size, and JEDEC-standard pin 1 index corner. Pin 1 is located at the bottom-left corner when viewed from top with index mark at upper-left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C135-25JC and AS7C34098B-25JC, the 7134LA25JI uniquely combines industrial temperature rating, MIL-PRF-38535 qualification, and guaranteed 2 V data retention-making it irreplaceable in safety-critical, power-interrupted, or extended-lifecycle deployments where memory persistence is non-negotiable.

Availability

7134LA25JI is available at Aetrix Electronics and suitable for industrial PLCs, avionics data loggers, and real-time video processing systems requiring stable component supply across extended product lifecycles and rigorous environmental qualification.

Supply support for 7134LA25JI 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 delivering trusted microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The IDT7134 family-acquired from Integrated Device Technology-was engineered for high-reliability dual-port memory applications demanding deterministic timing, low power, and military-grade robustness in contention-prone architectures.

FAQ

What is the guaranteed maximum access time for 7134LA25JI across its full industrial temperature range?

The 7134LA25JI guarantees a maximum access time of 25 ns over the full –40°C to +85°C operating temperature range, as specified in Table 09a under "7134X25 Com'l & Ind" conditions. This value applies to tAA (address access), tACE (chip enable access), and tAOE (output enable access) parameters and is production-tested per Renesas' industrial qualification standards.

Does 7134LA25JI support true simultaneous read/write operations between ports?

Yes, the 7134LA25JI supports fully independent asynchronous read and write operations on left and right ports-provided external arbitration prevents simultaneous access to the same memory location. Its architecture has no internal arbitration logic; users must manage contention externally, as confirmed in the Functional Description section and Truth Table I.

What is the minimum V_CC required to maintain data retention in 7134LA25JI?

The 7134LA25JI maintains data retention down to V_CC = 2.0 V, as explicitly stated in Table 07 (Data Retention Characteristics) and noted in the Features section ("Battery backup operation-2V data retention (LA only)"). This specification is validated across all temperature grades and applies only to LA-series variants like the 7134LA25JI.

Which package type does the 'J' suffix indicate in 7134LA25JI?

The 'J' in 7134LA25JI denotes the 52-pin PLCC (Plastic Leaded Chip Carrier) package, specifically the PLG52 variant. This is confirmed in the Ordering Information table (Page 12), where "7134LA25JGI" and "7134LA25JGI8" both list "PLG52" as the Pkg. Code and "PLCC" as the Pkg. Type.

How does the standby current of 7134LA25JI compare between TTL-level and CMOS-level chip enable inputs?

When both ports use TTL-level CE inputs (CEL/CER = VIH), 7134LA25JI draws up to 40 mA (ISB1, industrial grade). With CMOS-level CE inputs (CE > V_CC − 0.2 V), full standby current drops to 0.2 mA (ISB3, typ.), representing a 200× reduction-enabling deep-sleep modes in portable or energy-constrained systems.