Renesas 7143SA25JI8

Overview

7143SA25JI8 from IDT is a high-speed 2K × 16 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting independent asynchronous access on left and right ports with 25ns max read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables error-free 32-bit-or-wider word-width memory systems without external logic.

For engineers reviewing the 7143SA25JI8 datasheet, 7143SA25JI8 pinout, 7143SA25JI8 application, or 7143SA25JI8 equivalent, key selection considerations include BUSY input behavior (not output), byte-selectable write control per port, 68-pin PLCC package compatibility, and its role in contention-aware width-expansion architectures with IDT7133 MASTER devices.

Technical Context

The 7143SA25JI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses for left and right ports - enabling concurrent read/write operations to distinct memory locations. Its BUSY pin functions exclusively as an input for write inhibition during address contention, unlike the IDT7133 MASTER which drives BUSY as an open-drain output.

It supports battery backup data retention at VCC = 2V (typical 100µA retention current) and features separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB) for granular 8-bit writes per port. The device uses CMOS high-performance technology and requires no external arbitration logic when paired with IDT7133 in width-expanded configurations.

Key Specifications

Pinout & Package

7143SA25JI8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC, PLG68) with 0.05-inch lead pitch and body size ≈ 0.95 in × 0.95 in × 0.17 in. Both VCC 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 CY7C1335KV18-250BZXI and AS7C3256A-25JCIN, the 7143SA25JI8 uniquely delivers hardware-enforced contention resolution via dedicated BUSY input pins and seamless integration with IDT7133 MASTER devices - enabling robust, layout-compatible width expansion without firmware or logic overhead.

Availability

7143SA25JI8 is available at Aetrix Electronics and suitable for real-time dual-processor systems, industrial motion controllers, avionics data concentrators, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for 7143SA25JI8 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 7143SA25JI8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic, contention-aware memory sharing between heterogeneous processors and real-time subsystems.

FAQ

What is the function of the BUSY pins on the 7143SA25JI8?

The BUSY pins (BUSYL and BUSYR) on the 7143SA25JI8 serve exclusively as inputs for write-inhibition during address contention - unlike the IDT7133 MASTER, which drives BUSY as an open-drain output. When asserted HIGH by an IDT7133 MASTER device, they block write operations on the corresponding port. This SLAVE-only behavior eliminates external arbitration logic in width-expanded systems and is fundamental to the 7143SA25JI8's role in MASTER/SLAVE configurations.

Can the 7143SA25JI8 operate as a standalone dual-port RAM without an IDT7133 MASTER?

Yes, the 7143SA25JI8 can operate as a standalone dual-port RAM with independent left/right port access, but its BUSY pins must be tied HIGH (via pull-up resistors) to disable write-inhibition logic. In this mode, it functions identically to the IDT7133 in non-contention scenarios - however, hardware arbitration for simultaneous same-address access is disabled, requiring software-level coordination or application-level avoidance of conflicting accesses.

What is the maximum operating frequency supported by the 7143SA25JI8?

The 7143SA25JI8 does not use a clock signal; it is a fully asynchronous device. Its timing is defined by access parameters - most critically tRC (Read Cycle Time) of 25ns max - which corresponds to a theoretical maximum sustained throughput of 40 million operations per second per port. System-level speed depends on external controller timing margins, PCB layout, and signal integrity, not an internal clock frequency.

Does the 7143SA25JI8 support battery backup data retention?

No, the 7143SA25JI8 does not support battery backup data retention. The 'SA' suffix denotes the standard-power version; data retention capability (down to 2V VCC) is exclusive to 'LA' variants such as 7143LA25JI8. The 7143SA25JI8 requires continuous 5V ±10% supply to maintain data integrity and has no specified retention current or low-voltage hold functionality.

Which package type is used for the 7143SA25JI8 part number ending in 'JI8'?

The 'JI8' suffix in 7143SA25JI8 indicates a 68-pin Plastic Leaded Chip Carrier (PLCC) package, specifically the PLG68 variant. This is confirmed by IDT documentation showing identical pinouts across 7133/7143 families and explicit labeling of JI8 as PLCC in ordering guides. The package features gull-wing leads, JEDEC-standard footprint, and is RoHS-compliant.