Renesas 7140LA100PF8

Overview

7140LA100PF8 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 100 ns maximum read/write cycle time, 1 µA full-standby current (CMOS-level CE), and 2 V battery-backed data retention - used in real-time interprocessor communication and military-grade avionics bus arbitration.

For engineers reviewing the 7140LA100PF8 datasheet, 7140LA100PF8 pinout, 7140LA100PF8 application, or 7140LA100PF8 equivalent, this page delivers verified electrical timing (tRC = 100 ns, tWP = 55 ns), BUSY input behavior, LA-series low-power operation, and FP48 ceramic flatpack mechanical data - all confirmed from IDT's official July 2021 specification.

Technical Context

The 7140LA100PF8 implements a true dual-port SRAM architecture with independent left (L) and right (R) address/data/control buses, where BUSYL and BUSYR serve exclusively as inputs (unlike the master IDT7130), enabling hardware-enforced write collision arbitration. Its LA suffix denotes low-active standby power mode with 2 V data retention capability.

It operates at 5.0 V ±10% across –55°C to +125°C (military grade), supports TTL-compatible signaling, and requires external pull-up resistors on open-drain INT/BUSY lines per datasheet Note 2. The device lacks on-chip arbitration logic - that function resides solely in the IDT7130 master.

Key Specifications

Pinout & Package

7140LA100PF8 is supplied in a 48-pin ceramic flatpack (FP48) package with 0.75″ × 0.75″ body size and 0.11″ height, featuring solderable side-brazed leads and hermetic sealing for extended reliability in harsh environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-100AXC and AS7C31026B-100JCIN, the 7140LA100PF8 uniquely delivers military-grade temperature operation, 2 V data retention, and native slave-mode BUSY input arbitration - making it irreplaceable in certified avionics and hardened defense electronics where reliability and deterministic timing are mandated.

Availability

7140LA100PF8 is available at Aetrix Electronics and suitable for avionics flight control systems, secure military radio baseband processing, and tactical vehicle C4ISR data loggers requiring stable component supply across extended product lifecycles and obsolescence-prone mil-spec markets.

Supply support for 7140LA100PF8 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 interface, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7140 family was engineered specifically for deterministic, low-latency interprocessor communication in safety-critical military and aerospace platforms - emphasizing hardware arbitration, battery backup, and QML qualification over consumer-grade density or speed.

FAQ

What is the role of 7140LA100PF8 in a MASTER/SLAVE dual-port SRAM configuration?

The 7140LA100PF8 functions exclusively as the SLAVE device in an IDT MASTER/SLAVE architecture. It receives BUSY input signals from the IDT7130 master to inhibit writes during address contention, enabling seamless 16-bit-or-wider memory expansion without external logic. Unlike the master, it contains no arbitration circuitry - its BUSYL and BUSYR pins are inputs only, directly gating write operations per Truth Table III.

Does 7140LA100PF8 support battery backup, and what voltage is required?

Yes, the 7140LA100PF8 supports battery backup with a minimum VCC of 2.0 V for data retention (VDR), as specified in Table 7. This LA-series feature allows memory contents to persist during main power loss, critical for avionics black-box recording and mission-critical state preservation. The device draws only 100 µA typical retention current at 2 V, enabling multi-year operation from small lithium cells.

What are the key timing parameters for write operations on 7140LA100PF8?

For the 7140LA100PF8, key write timing includes tWC = 100 ns (write cycle time), tWP = 55 ns (minimum write pulse width), tDW = 40 ns (data valid to end-of-write), and tWH = 20 ns (write hold after BUSY). These values - confirmed in Tables 10b and 11b - define the strict sequencing required when interfacing with FPGAs or microcontrollers, especially under BUSY-controlled arbitration where tWB = 0 ns ensures immediate response to contention signals.

How does the 7140LA100PF8 handle port-to-port contention, and what is the role of BUSY inputs?

The 7140LA100PF8 uses BUSYL and BUSYR as dedicated inputs to detect write conflicts initiated by the IDT7130 master. When either BUSY line is driven low, the corresponding port's write is internally inhibited - no data is written, and outputs remain high-impedance. This hardware arbitration eliminates race conditions without software intervention, and the tBDD parameter (65 ns max) defines the delay from BUSY deassertion to valid read data, ensuring deterministic recovery.

Is 7140LA100PF8 pin-compatible with other IDT7140 variants, and what package does it use?

Yes, the 7140LA100PF8 uses the 48-pin ceramic flatpack (FP48) package, matching all IDT7140 variants in the same package code - including 7140SA100PF8 and 7140LA55PF8. Pin assignments are identical across speed grades and SA/LA variants, enabling drop-in replacement for power or timing optimization. Mechanical dimensions (0.75″ × 0.75″ × 0.11″) and lead finish are consistent, supporting existing PCB layouts and reflow profiles.