Renesas 7143SA55J8

Overview

7143SA55J8 from IDT is a 2K × 16-bit high-speed dual-port SRAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting asynchronous read/write on independent left/right ports with 55 ns 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 memory systems without external logic.

For engineers reviewing the 7143SA55J8 datasheet, 7143SA55J8 pinout, 7143SA55J8 application, or 7143SA55J8 equivalent, key selection considerations include BUSY input behavior (not output), absence of on-chip arbitration logic, byte-selectable write control per port, 68-pin PLCC package compatibility, and data retention capability only in LA variants - not applicable to this SA-grade part.

Technical Context

The 7143SA55J8 operates as a SLAVE dual-port RAM with BUSY pin functioning exclusively as a write-inhibit input - unlike the MASTER IDT7133 which drives BUSY as an open-drain output. It lacks internal arbitration logic and relies entirely on external BUSY signaling from a MASTER device for contention resolution.

It supports fully asynchronous, independent access on both ports with separate address (A0L–A10L / A0R–A10R), control (CEL/CER, R/WLUB/R/WRUB, R/WLLB/R/WRLB, OEL/OER), and bidirectional I/O (I/O0L–I/O15L / I/O0R–I/O15R) lines. No on-chip port-to-port synchronization is performed.

Key Specifications

Pinout & Package

7143SA55J8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), with identical pinout to IDT7133 series devices. Both VCC pins must be connected to 5V supply and both GND pins to ground for reliable operation. Package body measures approximately 0.95 in × 0.95 in × 0.17 in.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7133SA55J8, the 7143SA55J8 eliminates arbitration logic and uses BUSY solely as input - reducing complexity in slave-only roles. Versus CY7C1362BV33-55AXI, it maintains 5V TTL compatibility and mechanical footprint but lacks 3.3V operation and advanced power modes.

Availability

7143SA55J8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics display systems, and medical imaging equipment requiring stable component supply across extended product lifecycles.

Supply support for 7143SA55J8 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 high-performance silicon solutions for communications and computing markets.

The IDT7143 product line delivers SLAVE-configured dual-port SRAMs designed specifically for width-expansion architectures where centralized arbitration is handled by a MASTER device - optimizing system-level determinism and layout simplicity.

FAQ

What is the role of BUSY pins on the 7143SA55J8?

The BUSYL and BUSYR pins on the 7143SA55J8 function exclusively as inputs - not outputs - and serve as write-inhibit signals. When asserted high, they block all write operations on the corresponding port and force I/O pins into high-impedance state. This behavior distinguishes the 7143SA55J8 from the MASTER IDT7133, which drives BUSY as an open-drain output. The 7143SA55J8 relies entirely on external BUSY signaling from a MASTER device for contention resolution.

Can the 7143SA55J8 operate as a standalone dual-port RAM without a MASTER device?

Yes, the 7143SA55J8 can operate as a standalone dual-port RAM, but only in non-contention scenarios where both ports access distinct memory addresses. Since it lacks on-chip arbitration logic and BUSY pins are inputs only, it cannot autonomously resolve simultaneous accesses to the same address. In such cases, external logic or system-level protocol must prevent conflicts - or a MASTER device (e.g., IDT7133SA55J8) must be used to generate BUSY signals.

Does the 7143SA55J8 support battery backup or data retention mode?

No, the 7143SA55J8 does not support battery backup or data retention mode. That capability is exclusive to LA-grade variants (e.g., IDT7143LA55J8), which specify 2V data retention voltage and microamp-level standby current. The "SA" suffix denotes standard power consumption - with typical active current of 230 mA and standby current of 25 mA - and no guaranteed operation below 4.5 V.

What package type is used for the 7143SA55J8, and are there footprint alternatives?

The 7143SA55J8 is supplied in a 68-pin Plastic Leaded Chip Carrier (PLCC) package, designated by the "J8" suffix. It shares identical pinout and mechanical dimensions with other IDT7133/7143 family members in PLCC, PGA, flatpack, and 100-pin TQFP packages. While the J8 variant is PLCC-only, compatible functionality is available in GU68 (PGA) and FP68 (flatpack) footprints - though those require board redesign due to differing land patterns and mounting methods.

How does the 7143SA55J8 handle simultaneous read/write operations on the same address?

The 7143SA55J8 does not internally resolve simultaneous read/write operations to the same address. Its BUSY pins are inputs only, so it cannot assert BUSY to stall the opposing port. If both ports attempt conflicting access, the result is undefined - potentially causing data corruption. Correct operation requires either external arbitration (e.g., via IDT7133 MASTER) or strict software coordination ensuring that writes occur only when the target address is not simultaneously read from the other port.