Renesas 7133LA20JG8

Overview

7133LA20JG8 from IDT (Integrated Device Technology) is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 20 ns maximum read cycle time, 2V data retention capability, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access from two independent ports in real-time systems such as digital signal processors, network packet buffers, and military avionics.

For engineers reviewing the 7133LA20JG8 datasheet, 7133LA20JG8 pinout, 7133LA20JG8 application, or 7133LA20JG8 equivalent, key selection criteria include its on-chip port arbitration, BUSY output flag for contention resolution, low standby current (1 µA typ.), 68-pin PLCC package, and compatibility with 5 V ±10% TTL-level operation.

Technical Context

The 7133LA20JG8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves simultaneous accesses to identical memory locations by asserting BUSYL/BUSYR open-drain outputs-requiring external pull-up resistors-and gating write signals on the contended port.

It supports byte-level write control (R/WLUB/R/WLLB and R/WRUB/R/WRLB), independent chip enable (CEL/CER), and output enable (OEL/OER) per port. The device enters ultra-low-power data retention mode at V_CC = 2 V, drawing ≤4 mA typical ICCDR, enabling battery-backed operation without external backup circuitry.

Key Specifications

Pinout & Package

7133LA20JG8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 0.95 in × 0.95 in × 0.17 in, with dual-row gull-wing leads. Both V_CC and GND pins must be connected to ensure reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-20VC and IDT7143LA20JG8, the 7133LA20JG8 uniquely integrates arbitration logic and BUSY output, enabling drop-in deployment in master-controlled dual-port systems without redesigning control logic or adding discrete components.

Availability

7133LA20JG8 is available at Aetrix Electronics and suitable for telecom packet buffering, DSP co-processing, military avionics displays, and industrial PLC motion sequencing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 7133LA20JG8 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

IDT (Integrated Device Technology) is a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT7133 family was designed specifically for real-time embedded systems requiring deterministic, contention-free dual-port memory access-especially in military, aerospace, and industrial control applications demanding reliability under thermal stress and power interruption.

FAQ

What is the primary function of the BUSY pin on the 7133LA20JG8?

The BUSY pin on the 7133LA20JG8 is an open-drain output that signals port contention when both left and right ports attempt simultaneous access to the same memory location. It gates write operations on the contended port and requires an external pull-up resistor. This hardware arbitration eliminates race conditions without software intervention, making it essential for deterministic real-time systems.

Does the 7133LA20JG8 support battery backup operation, and what voltage is required?

Yes, the 7133LA20JG8 supports battery backup operation with guaranteed data retention at V_CC = 2.0 V minimum. In this mode, it draws ≤4 mA typical current (ICCDR), enabling direct connection to a 2 V coin cell or supercapacitor. This feature is intrinsic to the LA (low-power) variant and is validated across the full industrial temperature range (–40°C to +85°C).

Can the 7133LA20JG8 operate as a standalone dual-port RAM, or does it require a companion device?

The 7133LA20JG8 operates fully standalone as a 16-bit dual-port RAM. Its on-chip arbitration logic and BUSY output make it self-sufficient for single-chip applications. However, it also functions as a MASTER in width-expanded configurations-when paired with IDT7143LA20JG8 SLAVE devices-to build 32-bit or wider memory systems without external glue logic.

What is the significance of the 'JG8' suffix in the 7133LA20JG8 part number?

The 'JG8' suffix in 7133LA20JG8 denotes the 68-pin Plastic Leaded Chip Carrier (PLCC) package with JEDEC-standard pinout and lead finish. It confirms mechanical compatibility with industry-standard PLCC sockets and reflow profiles. This package variant is distinct from PGA, flatpack, or TQFP versions of the same speed grade.

How does the 7133LA20JG8 handle simultaneous read and write operations to the same address?

When both ports access the same address simultaneously, the 7133LA20JG8 uses internal arbitration logic to grant priority based on setup timing (tAPS ≥5 ns). The winning port proceeds; the losing port asserts BUSY and inhibits its write. Read operations remain valid on the winning side. This hardware resolution avoids data corruption and eliminates the need for software locks or polling loops in time-critical applications.