Renesas 7134LA20JI

Overview

IDT7134LA20JI from Renesas Electronics is a high-speed 4K × 8 dual-port static RAM with independent left/right ports, 20 ns read cycle time (max), TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7134LA20JI datasheet, 7134LA20JI pinout, 7134LA20JI application, or 7134LA20JI equivalent, this page delivers verified timing specs, dual-port arbitration behavior, battery-backed data retention (2V), low-power standby (1 µA typical full standby), and PLCC-52 package compatibility for legacy military/industrial designs.

Technical Context

The 7134LA20JI 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 CE, OE, R/W, and address decoding, enabling external contention management.

It supports battery backup data retention at V_CC ≥ 2V (LA-specific), achieves 20 ns max t_RC and 15 ns max t_AOE, and operates with CMOS-level standby current (ISB3 = 0.2 mA typ) when both CE pins exceed V_CC − 0.2 V.

Key Specifications

Pinout & Package

7134LA20JI is supplied in a 52-pin PLCC (PLG52) package with J-lead configuration, body size ≈ 0.75 in × 0.75 in × 0.17 in. All V_CC and GND pins must be externally decoupled per datasheet note.

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-20JIN, the 7134LA20JI uniquely combines 20 ns speed, industrial temperature range, and native 2V battery retention in a 52-pin PLCC-making it irreplaceable for legacy 5V systems requiring fail-safe data hold.

Availability

7134LA20JI is available at Aetrix Electronics and suitable for real-time inter-processor communication, legacy military avionics buffering, and industrial PLC I/O mapping requiring stable component supply across extended product lifecycles.

Supply support for 7134LA20JI 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 infrastructure markets.

The IDT7134 family was originally developed by Integrated Device Technology (acquired by Renesas in 2019) to serve high-reliability dual-port memory needs in defense, aerospace, and industrial control-prioritizing deterministic timing, data integrity under contention, and long-term obsolescence resilience.

FAQ

What is the maximum operating temperature range for the 7134LA20JI?

The 7134LA20JI is rated for industrial temperature operation from –40°C to +85°C. This range is validated across all electrical parameters including t_RC, ISB3, and V_OL/V_OH, with no derating required. The device meets Renesas' industrial qualification standards and is commonly deployed in factory automation and outdoor telecom equipment where ambient thermal stress is significant. The 7134LA20JI does not support commercial (0°C to +70°C) or military (–55°C to +125°C) grades.

Does the 7134LA20JI support true dual-port contention resolution?

No-the 7134LA20JI does not include on-chip arbitration logic. When both ports access the same memory location simultaneously, contention must be managed externally by the system designer. The datasheet explicitly states that "it is the user's responsibility to ensure data integrity" under such conditions. The 7134LA20JI provides independent CE, OE, and R/W controls per port to enable external arbitration schemes (e.g., semaphores or priority encoders), but offers no automatic resolution. This architecture reduces latency and silicon area versus integrated-arbitration alternatives.

What is the minimum supply voltage required for data retention on the 7134LA20JI?

The 7134LA20JI guarantees data retention down to 2.0 V (V_DR), as specified in Table 2720 tbl 07. This applies only to the LA variant (not SA) and is measured with CE > V_HC and VIN held at valid logic levels. At V_CC = 2.0 V, typical retention current is 100 µA, with a maximum of 1500 µA over commercial temperature. The 7134LA20JI must be powered from a stable backup source (e.g., coin cell or supercapacitor) during main power loss-no external circuitry is required beyond proper V_CC switching.

Which package type is used for the 7134LA20JI?

The 7134LA20JI uses a 52-pin PLCC (plastic leaded chip carrier) package, designated PLG52 in Renesas' ordering nomenclature. Its body dimensions are approximately 0.75 in × 0.75 in × 0.17 in, with J-leads for surface-mount assembly. Pin 1 is located at the index corner, and the package complies with JEDEC MS-026 standards. This PLCC variant is distinct from the 48-pin DIP (PDG48), LCC (LC48), or Flatpack (FP48) options offered in the broader 7134LA family.

Can the 7134LA20JI operate with a 3.3V supply?

No-the 7134LA20JI is strictly a 5V device with a recommended supply range of 4.5 V to 5.5 V (±10%). Its input thresholds (VIH = 2.2 V min, VIL = 0.8 V max) and output drive strength are designed for TTL/5V CMOS compatibility. Applying 3.3V violates the Absolute Maximum Rating for V_TERM and will result in undefined operation, excessive leakage, or permanent damage. For 3.3V systems, Renesas offers the AS7C34098B series-but those lack battery retention and are not pin-compatible with the 7134LA20JI.