Renesas 7140LA20JG8

Overview

7140LA20JG8 from IDT (Integrated Device Technology) is a 1K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting fully asynchronous left/right port access with 20 ns max read cycle time, 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory systems without external logic in real-time control and DSP co-processing applications.

For engineers reviewing the 7140LA20JG8 datasheet, 7140LA20JG8 pinout, 7140LA20JG8 application, or 7140LA20JG8 equivalent, key selection criteria include BUSY input behavior (not output), battery-backed data retention at 2 V, low 1 µA full-standby current, and compatibility with IDT7130 MASTER devices for seamless width expansion.

Technical Context

The 7140LA20JG8 operates as a SLAVE dual-port SRAM with dedicated left (L) and right (R) ports, each featuring independent address (A0–A9), data (I/O0–I/O7), and control lines (CEL/CER, OEL/OER, R/WL/R/WR). Unlike the MASTER IDT7130, it lacks on-chip arbitration logic and receives BUSY signals (BUSYL/BUSYR) as inputs to inhibit writes during contention.

Its LA variant supports 2 V battery backup with 100–4000 µA data retention current, and achieves 20 ns read cycle time (tRC) with 11 ns output enable access (tAOE) and 15 ns write pulse width (tWP), all specified under industrial temperature and 5 V ±10% supply conditions.

Key Specifications

Pinout & Package

7140LA20JG8 is packaged in a 48-pin ceramic flatpack (FP48), measuring approximately 0.75 in × 0.75 in × 0.11 in, with pins arranged in dual rows and marked index corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C135-20VXI and IDT7130LA20JG8, the 7140LA20JG8 uniquely delivers SLAVE-specific BUSY input behavior, 2 V data retention, and guaranteed industrial temperature operation-enabling simpler, lower-power, and more robust dual-processor memory sharing without external components.

Availability

7140LA20JG8 is available at Aetrix Electronics and suitable for real-time motion control, DSP co-processing, redundant communication gateways, and industrial PLC data exchange requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 7140LA20JG8 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, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7130/7140 family was designed specifically for high-reliability dual-processor systems requiring deterministic, contention-free memory access-targeting industrial automation, military avionics, and telecom infrastructure.

FAQ

What is the role of 7140LA20JG8 in a MASTER/SLAVE dual-port SRAM configuration?

The 7140LA20JG8 functions exclusively as the SLAVE device: it accepts BUSY inputs (BUSYL/BUSYR) from a MASTER IDT7130 to inhibit writes during address contention, lacks on-chip arbitration logic, and relies on the MASTER for priority resolution. This division of responsibility simplifies system design and guarantees error-free 16-bit memory expansion without discrete logic.

Does 7140LA20JG8 support battery backup, and what are the retention specifications?

Yes, the LA suffix denotes low-power battery backup capability. The 7140LA20JG8 retains data at VCC = 2.0 V minimum, with typical data retention current of 100 µA (industrial grade) and maximum 4000 µA. This enables use with standard 3 V lithium coin cells through a simple resistive divider or LDO, eliminating need for complex backup power circuitry.

How does the BUSY input functionality of 7140LA20JG8 differ from the BUSY output of IDT7130?

Unlike the IDT7130 MASTER-which drives BUSY as an open-drain output requiring external pull-up-the 7140LA20JG8 receives BUSY as a dedicated input. When BUSYL or BUSYR is driven LOW by the MASTER, the 7140LA20JG8 internally inhibits writes to the corresponding port, ensuring atomic access without software intervention or external arbitration gates.

What package type is used for 7140LA20JG8, and are there thermal or layout considerations?

The 7140LA20JG8 uses a 48-pin ceramic flatpack (FP48) with dimensions ~0.75 in × 0.75 in × 0.11 in. Its ceramic body offers superior thermal stability vs. plastic DIP, critical for industrial temperature operation. Layout requires separate VCC/GND pairs per side, 0.1 µF ceramic decoupling at each VCC pin, and guard traces around BUSY/INT lines to prevent noise-induced false arbitration.

Can 7140LA20JG8 operate independently, or does it require pairing with IDT7130?

The 7140LA20JG8 can operate as a standalone dual-port SRAM-both ports function fully with independent control-but its BUSY input pins must be tied HIGH (via pull-up) if not used in a MASTER/SLAVE system. However, its primary value is realized in paired configurations with IDT7130, where it enables seamless 16-bit+ data bus expansion without external logic or timing penalties.