Renesas 7133SA70GB

Overview

7133SA70GB from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 70 ns max read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access from two independent ports and supports bus-width expansion in real-time control systems requiring deterministic memory arbitration.

For engineers reviewing the 7133SA70GB datasheet, 7133SA70GB pinout, 7133SA70GB application, or 7133SA70GB equivalent, this page delivers verified timing parameters, BUSY arbitration behavior, byte-select write control, battery backup capability (2V data retention), and package-specific pin mapping for reliable integration into dual-CPU, motor control, and packet buffering designs.

Technical Context

The 7133SA70GB implements on-chip port arbitration logic exclusively in MASTER mode, generating open-drain BUSY output signals (BUSYL/BUSYR) that require external pull-up resistors. Its dual independent ports support fully asynchronous reads/writes with separate CE, R/W, OE, and address buses per side.

It features separate upper- and lower-byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), enabling granular 8-bit writes without affecting adjacent bytes. The device enters low-power standby (<5 mW typ.) when both chip enables are deasserted, and retains data down to 2V for battery-backed operation.

Key Specifications

Pinout & Package

7133SA70GB is packaged in a 68-pin PLCC (PLG68) with 0.95″ × 0.95″ footprint. Pin 1 is marked by corner notch; both VCC and GND pins are duplicated for noise immunity and thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362AV25 and IDT7143SA70GB, the 7133SA70GB uniquely integrates arbitration logic and open-drain BUSY signaling - enabling drop-in deterministic dual-CPU memory sharing without external components or timing-critical FPGA logic.

Availability

7133SA70GB is available at Aetrix Electronics and suitable for motor control systems, industrial PLCs, dual-CPU communication buffers, and packet buffering applications requiring stable component supply across extended product lifecycles.

Supply support for 7133SA70GB 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 semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics.

The IDT7133 family was designed specifically for deterministic dual-processor systems requiring hardware-arbitrated shared memory - targeting industrial automation, avionics, and real-time communications.

FAQ

What is the function of the BUSY pins on the 7133SA70GB?

The BUSYL and BUSYR pins on the 7133SA70GB are open-drain outputs indicating port-to-port address contention. When both ports attempt access to the same memory location simultaneously, the on-chip arbitration logic asserts the corresponding BUSY signal to stall the lower-priority port. Because they are open-drain, external pull-up resistors are required for proper logic-level operation. This mechanism prevents data corruption without software intervention.

Does the 7133SA70GB support battery backup operation?

Yes, the 7133SA70GB supports battery backup operation with guaranteed data retention at VCC = 2.0 V. In this mode, the device draws ≤4000 µA (military/industrial grade) while preserving all stored data. This feature is intrinsic to the LA variant, but the SA suffix in 7133SA70GB indicates it shares the same 2V retention capability - confirmed by IDT's characterization data in Table 8 of the datasheet.

Can the 7133SA70GB operate as a standalone dual-port RAM without a 7143 slave device?

Yes, the 7133SA70GB functions fully as a standalone 2K × 16 dual-port SRAM. Its on-chip arbitration logic, BUSY outputs, and independent port controls allow autonomous operation in any two-processor or producer-consumer architecture. The 7143 is optional and used only when expanding data bus width beyond 16 bits - the 7133SA70GB does not require a companion device to perform its core memory function.

What is the difference between R/WLUB and R/WLLB on the 7133SA70GB?

R/WLUB (Read/Write Upper Byte) and R/WLLB (Read/Write Lower Byte) are independent write-enable controls for the left port's I/O8–I/O15 and I/O0–I/O7 data lines, respectively. This allows byte-granular writes without disturbing the complementary byte - essential for efficient protocol stack handling or partial register updates. Both signals must be LOW to write the corresponding 8-bit segment; their timing is validated per AC specification tables for the 70 ns speed grade.

Which package types are available for the 7133SA70GB?

The 7133SA70GB is offered in 68-pin PLCC (PLG68), 68-pin ceramic PGA (GU68), 68-pin flatpack (FP68), and 100-pin TQFP (PNG100). The "GB" suffix in the part number specifically denotes the 68-pin PLCC package. All variants share identical electrical specifications and pinouts, but mechanical dimensions and thermal characteristics differ - PLCC offers cost-effective reworkability, while TQFP provides higher I/O density and improved thermal dissipation.