Renesas 7133LA55PF8

Overview

7133LA55PF8 from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 55 ns max read cycle time, 5V single-supply operation, and 1 μW typical standby power - used in real-time embedded systems requiring concurrent CPU/DSP memory access without bus contention.

For engineers reviewing the 7133LA55PF8 datasheet, 7133LA55PF8 pinout, 7133LA55PF8 application, or 7133LA55PF8 equivalent, this page delivers verified timing specs, byte-selectable write control per port, BUSY arbitration behavior, industrial temperature support (–40°C to +85°C), and direct replacement guidance for width-expansion memory subsystems.

Technical Context

The 7133LA55PF8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses. It features on-chip port arbitration logic exclusive to the IDT7133 family, enabling deterministic resolution of simultaneous accesses to identical memory locations via open-drain BUSYL/BUSYR outputs requiring external pull-up resistors.

It supports battery backup data retention at VCC = 2V with 100 µA typical retention current, and provides separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB) for granular 8-bit writes per port - critical for mixed-precision DSP or co-processor interfacing where partial-word updates are required.

Key Specifications

Pinout & Package

7133LA55PF8 is supplied in a 68-pin Plastic Leaded Chip Carrier (PLCC, package code PLG68), with dual-row gull-wing leads and internal heat slug. Both VCC and GND pins must be connected to ensure reliable operation per datasheet Note 1–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7143LA55PF8 and CY7C1335KV18-55BGXI, the 7133LA55PF8 uniquely delivers integrated master arbitration, 5V TTL compatibility, and industrial-grade reliability in a single 68-pin PLCC - making it irreplaceable for legacy or cost-sensitive dual-CPU embedded systems requiring deterministic contention resolution.

Availability

7133LA55PF8 is available at Aetrix Electronics and suitable for radar signal processing, digital motor control, avionics display systems, and industrial PLC I/O modules requiring stable component supply across extended product lifecycles.

Supply support for 7133LA55PF8 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 timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics since 2019.

The IDT7133/7143 family was designed specifically for real-time embedded systems requiring deterministic, contention-free dual-processor memory sharing - targeting aerospace, industrial automation, and test equipment markets.

FAQ

What is the difference between IDT7133LA and IDT7143LA, and why does 7133LA55PF8 include arbitration logic?

The 7133LA55PF8 is the MASTER device with built-in port arbitration logic and open-drain BUSY outputs, while IDT7143LA is the SLAVE with BUSY inputs only. Arbitration logic resolves simultaneous same-address accesses deterministically - a feature exclusive to the IDT7133 series. This eliminates need for external logic in dual-CPU systems, and is fundamental to the 7133LA55PF8's role in real-time embedded memory architectures.

Does 7133LA55PF8 support true 55 ns access across its full industrial temperature range?

Yes - the 55 ns maximum read cycle time (tRC) is guaranteed over –40°C to +85°C per datasheet Table 10b. This specification applies to both commercial and industrial grades of the 7133LA55PF8, confirmed under VCC = 5.0 V ±10% and AC test conditions defined in Table 9. No derating is required within this temperature envelope.

How should the BUSY pins be connected on 7133LA55PF8 for proper arbitration operation?

BUSYL and BUSYR on the 7133LA55PF8 are open-drain outputs and must each be pulled up to VCC via external resistors (typically 4.7 kΩ). When contention occurs, the asserting port drives BUSY low; the opposing port detects this and gates its write enable internally. Failure to install pull-ups will prevent BUSY signaling and cause undetected data corruption during simultaneous writes.

Can 7133LA55PF8 operate with only one port enabled while the other remains inactive?

Yes - the 7133LA55PF8 supports asymmetric operation. With CEL = VIH and CER = VIL, only the right port is active; left port enters full standby (ISB3 ≤ 1 µA typ.). This mode is commonly used in hybrid systems where one processor handles background tasks while the other performs real-time control, leveraging the 7133LA55PF8's independent port power gating.

Is 7133LA55PF8 pin-compatible with faster or slower speed grades like 7133LA25PF8 or 7133LA70PF8?

Yes - all IDT7133LA variants (20, 25, 35, 45, 55, 70, 90 ns) share identical 68-pin PLCC pinouts and electrical interfaces. Speed grade affects only timing parameters (e.g., tRC, tAA); no PCB or firmware changes are needed when upgrading or downgrading within the LA family. The 7133LA55PF8 can be substituted with any other LA-grade part in the same package without layout modification.