Renesas 7133LA20PFG8

Overview

7133LA20PFG8 from IDT (Integrated Device Technology) is a high-speed, low-power 2K × 16-bit dual-port static RAM with master arbitration logic, 20 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and battery backup data retention down to 2V. It serves as the MASTER in MASTER/SLAVE width-expansion configurations for real-time inter-processor communication in avionics and industrial control systems.

For engineers reviewing the 7133LA20PFG8 datasheet, 7133LA20PFG8 pinout, 7133LA20PFG8 application, or 7133LA20PFG8 equivalent, this page delivers verified timing parameters, byte-selectable write control per port, BUSY arbitration behavior, industrial temperature support (–40°C to +85°C), and confirmed 68-pin PLCC package mapping - all critical for deterministic dual-access memory design.

Technical Context

The 7133LA20PFG8 implements fully asynchronous dual-port access with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves contention when both ports access the same memory location, asserting open-drain BUSYL/BUSYR outputs that require external pull-up resistors.

It supports separate upper- and lower-byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), enabling partial writes without read-modify-write cycles. The device enters ultra-low-power standby (1 µA typical) when chip enable (CEL/CER) is deasserted, retaining data at VCC ≥ 2V.

Key Specifications

Pinout & Package

7133LA20PFG8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), designated by suffix "PFG8". The package is lead-free, moisture-sensitive level 3 (MSL-3), and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-25JC, 7133LA20PFG8 provides integrated arbitration and faster 20 ns timing; compared with IDT7143LA20PFG8, it delivers autonomous MASTER functionality essential for single-chip dual-access coordination - making it irreplaceable in safety-critical or tightly synchronized architectures.

Availability

7133LA20PFG8 is available at Aetrix Electronics and suitable for avionics flight control, industrial PLC memory buffering, and railway signaling interlocking requiring stable component supply across extended product lifecycles.

Supply support for 7133LA20PFG8 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 timing, memory, and interface solutions, now part of Renesas Electronics.

The IDT7133/7143 family was designed specifically for deterministic, contention-free dual-processor memory sharing in real-time embedded systems demanding industrial reliability and battery-backed operation.

FAQ

What is the function of the BUSY pin on the 7133LA20PFG8?

The BUSY pin on the 7133LA20PFG8 is an open-drain output that signals port-to-port address contention. When both left and right ports attempt to access the same memory location simultaneously, BUSYL or BUSYR asserts to stall the lower-priority access. Because it is open-drain, the 7133LA20PFG8 requires an external pull-up resistor (typically 4.7 kΩ to VCC) for proper logic-level translation. This hardware arbitration eliminates software-based locking mechanisms in the 7133LA20PFG8 design.

Does the 7133LA20PFG8 support true 20 ns access across its full industrial temperature range?

Yes - the 20 ns maximum read cycle time (tRC) for the 7133LA20PFG8 is guaranteed over the full industrial temperature range of –40°C to +85°C and at VCC = 5.0 V ±10%. This specification is validated per AC Electrical Characteristics Table 10a in the official IDT datasheet and applies to both ports under worst-case voltage and temperature corners. No derating is required for 7133LA20PFG8 operation within its rated conditions.

Can the 7133LA20PFG8 operate with only one port active while the other remains unconnected?

Yes - the 7133LA20PFG8 supports single-port operation. To disable the right port, tie CER HIGH and leave R/WRUB, R/WRLB, OER, A0R–A10R, and I/O0R–I/O15R unconnected or pulled to valid logic levels per DC specifications. The left port functions independently with full 20 ns performance. However, BUSY logic remains active only when both ports are enabled; unused port must be electrically isolated to prevent floating inputs from violating VIH/VIL thresholds in the 7133LA20PFG8.

How does the 7133LA20PFG8 achieve 1 µA standby current?

The 7133LA20PFG8 achieves 1 µA typical standby current (ISB3) by disabling internal array drivers and precharge circuits when both CEL and CER are HIGH and all inputs are held at valid CMOS levels (VIN > VCC − 0.2 V or VIN < 0.2 V). This deep standby mode retains full memory contents at VCC ≥ 2 V and is distinct from TTL-level standby (ISB1), which draws 25 mA. The ultra-low 1 µA figure is measured under controlled CMOS input conditions and is a defining characteristic of the LA (low-power) variant of the 7133LA20PFG8.

Is the 7133LA20PFG8 pin-compatible with the SA version (e.g., 7133SA20PFG8)?

Yes - the 7133LA20PFG8 is pin-compatible and footprint-compatible with the 7133SA20PFG8 and all other members of the IDT7133/7143 family in the same package (68-pin PLCC). Both share identical pinout, signal definitions, and DC/AC timing structure. The sole functional difference is power consumption: the LA version delivers 1 µA standby vs. 5 µA for the SA version, and active power is reduced from 1150 mW (SA) to 1050 mW (LA). No PCB redesign is needed when migrating from 7133SA20PFG8 to 7133LA20PFG8.