Renesas 7133LA35PF8

Overview

7133LA35PF8 from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 35 ns max read cycle time, 1 mW typical standby power, and industrial temperature support (–40°C to +85°C). It enables simultaneous asynchronous access from left/right ports in real-time embedded systems requiring deterministic memory contention resolution - such as dual-CPU communication buffers or video frame buffer controllers.

For engineers reviewing the 7133LA35PF8 datasheet, 7133LA35PF8 pinout, 7133LA35PF8 application, or 7133LA35PF8 equivalent, key selection considerations include BUSY arbitration timing (tBDD = 35 ns), byte-selectable write control (R/WLUB/R/WLLB), dual 5V TTL-compatible I/O, battery backup data retention at 2V, and 68-pin PLCC package compatibility with width-expansion using IDT7143LA slaves.

Technical Context

The 7133LA35PF8 implements fully asynchronous dual-port operation with independent address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves port-to-port contention via open-drain BUSYL/BUSYR outputs that assert when both ports access the same address simultaneously.

It supports byte-level write enable (upper/lower) per port, automatic power-down via CE control, and operates from a single 5.0 V ±10% supply. The LA variant uses low-power CMOS technology enabling 2V data retention with typical ICCDR ≤ 100 µA under battery backup conditions.

Key Specifications

Pinout & Package

7133LA35PF8 is housed in a 68-pin Plastic Leaded Chip Carrier (PLCC), designated PLG68. The package measures approximately 0.95 in × 0.95 in × 0.17 in and features gull-wing leads suitable for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7143LA35PF8 and CY7C133-35PC, the 7133LA35PF8 uniquely integrates arbitration logic and open-drain BUSY outputs - enabling self-contained dual-CPU buffering without external glue logic or timing redesign.

Availability

7133LA35PF8 is available at Aetrix Electronics and suitable for industrial automation, real-time communications, and embedded control systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7133LA35PF8 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 IDT7133/7143 family was designed specifically for deterministic dual-processor interconnect and real-time embedded memory applications demanding hardware-enforced arbitration and low-power battery backup.

FAQ

What is the function of the BUSY pins on the 7133LA35PF8?

The BUSYL and BUSYR pins on the 7133LA35PF8 are open-drain outputs that signal port contention - asserting when both left and right ports attempt access to the same memory address simultaneously. They require external pull-up resistors and are used to stall the contending port's access until resolution. This hardware arbitration eliminates race conditions in dual-CPU systems without software intervention.

Does the 7133LA35PF8 support battery backup operation?

Yes, the 7133LA35PF8 supports battery backup operation with data retention down to VCC = 2.0 V. In this mode, it draws ≤100 µA typical current (ICCDR), preserving memory contents during main power loss. This feature is intrinsic to the LA (low-power) variant and is validated across the industrial temperature range (–40°C to +85°C).

Can the 7133LA35PF8 be used without external arbitration logic?

Yes - the 7133LA35PF8 contains integrated arbitration logic and does not require external components to resolve port contention. Its on-chip BUSY generation and response circuitry handles simultaneous access deterministically. External logic is only needed if implementing custom arbitration policies beyond the device's native behavior.

What is the difference between 7133LA35PF8 and 7143LA35PF8?

The 7133LA35PF8 is the MASTER device with on-chip arbitration logic and BUSY outputs; the 7143LA35PF8 is the SLAVE with BUSY inputs only and no internal arbitration. They share identical pinouts and timing but differ functionally: only the 7133LA35PF8 can operate standalone as a dual-port arbitrator, while the 7143LA35PF8 must be paired with a 7133LA35PF8 in width-expanded configurations.

Is the 7133LA35PF8 compatible with 3.3V logic interfaces?

No - the 7133LA35PF8 is strictly 5V TTL-compatible, with VIH = 2.2 V min and VIL = 0.8 V max. It requires a 5.0 V ±10% supply and is not 3.3V I/O tolerant. Interfacing with 3.3V systems necessitates level translation on all control, address, and data lines to prevent damage and ensure valid logic thresholds.