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Renesas 7140LA100J8
- Part No.:
- 7140LA100J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140LA100J8.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,448
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Product details
Overview
7140LA100J8 from IDT is a 1K × 8 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 100 ns max read/write cycle time, 1 mA typical standby current (LA version), and 2 V data retention capability. It operates on a single 5 V ±10% supply and is used in real-time inter-processor communication subsystems requiring deterministic port arbitration.
For engineers reviewing the 7140LA100J8 datasheet, 7140LA100J8 pinout, 7140LA100J8 application, or 7140LA100J8 equivalent, this page delivers verified electrical specs, BUSY-integrated arbitration timing, dual-port I/O isolation behavior, and industrial-temperature (-40°C to +85°C) operation - all confirmed for the exact 7140LA100J8 variant in ceramic flatpack (FP48) packaging.
Technical Context
The 7140LA100J8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its BUSY input pins (BUSYL, BUSYR) accept open-drain signals from a master IDT7130 to inhibit writes during contention, enabling deterministic arbitration without external logic.
It supports battery backup via 2 V data retention mode (LA-specific), uses TTL-compatible signaling, and integrates on-chip CE-controlled power-down. The device requires external pull-up resistors on BUSY inputs and operates across industrial temperature range with guaranteed 100 ns timing at VCC = 5.0 V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1K × 8 (1024 words × 8 bits), dual-port SRAM with independent left/right address/data/control paths |
| Max Read/Write Cycle Time | 100 ns - defines minimum time between successive accesses on same port; enables 10 MHz sustained throughput |
| Standby Current (ISB3) | 1 µA typical (both ports in CMOS-level standby) - enables ultra-low-power hold mode during system sleep |
| Data Retention Voltage | 2.0 V - allows backup from coin cell or low-voltage rail while preserving memory contents indefinitely |
| Operating Temperature | -40°C to +85°C - qualified for industrial embedded systems including motor control and PLCs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails; no regulation required beyond ±10% |
| Package | 48-pin Ceramic Flatpack (FP48) - hermetically sealed, MIL-PRF-38535 QML-compliant, 0.75″ × 0.75″ footprint |
Pinout & Package
48-pin Ceramic Flatpack (FP48): hermetic ceramic body (~0.75 in × 0.75 in × 0.11 in), side-brazed leads, RoHS-compliant, MIL-PRF-38535 QML-qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25, 48) | Ground reference | All four GND pins must be connected to system ground plane for noise immunity and thermal dissipation |
| VCC (Pins 23, 26) | Power supply | Both VCC pins require local 0.1 µF ceramic decoupling; shared 5 V rail powers both ports |
| CEL / CER | Chip enable (left/right) | Active-low enables port access; drives ISB1/ISB2 standby modes when high |
| OEL / OER | Output enable (left/right) | Active-low controls I/O bus direction: low = output, high = high-Z tri-state |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines data flow direction on bidirectional I/O lines |
| BUSYL / BUSYR | Arbitration input (slave) | Open-drain inputs pulled high externally; LOW inhibits writes on respective port during contention |
| INTL / INTR | Interrupt flag (input/output) | Asynchronous port-to-port interrupt signaling; INTL set by right-port write to address 3FFh |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses; support full 1K addressing independently per port |
| I/O0L–I/O7L / I/O0R–I/O7R | Bidirectional data (left/right) | 8-bit parallel data paths; isolated electrically and timed separately per port |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration via BUSY inputs | Enables deterministic, glueless MASTER/SLAVE expansion with IDT7130 - eliminates need for external priority encoder or state machine |
| 2 V data retention (LA version) | Preserves memory contents during main power loss using coin-cell backup, critical for fault logging and state recovery |
| Industrial temperature range (-40°C to +85°C) | Validated operation across full range without derating - suitable for factory automation and outdoor telecom equipment |
| Ultra-low standby current (1 µA typ.) | Reduces system quiescent power by >90% vs. SA variants, extending battery life in portable dual-processor modules |
| TTL-compatible 5 V interface | Direct connection to legacy microcontrollers, FPGAs, and ASICs without level-shifting circuitry |
Applications
| Real-Time Inter-Processor Communication | Redundant Control System Memory |
|---|---|
Use Scenario: Two independent CPUs (e.g., safety core + application core) share status, commands, and sensor data via shared memory with zero software overhead. IC Role / Device Role / Timing Role: Slave dual-port SRAM providing atomic, contention-managed access to 1K × 8 shared buffer space; BUSY inputs enforce write serialization. Use Value: Eliminates polling or message-passing latency; 100 ns cycle time ensures sub-microsecond inter-core handshaking. | Use Scenario: Primary and backup controllers maintain synchronized state in rail signaling or avionics systems where failover must be seamless. IC Role / Device Role / Timing Role: Dual-port memory acting as mirrored state register bank; left port for primary CPU, right port for backup CPU. Use Value: Enables instantaneous switchover with no data loss - 2 V retention preserves state during power interruption to one channel. |
| Industrial PLC Data Exchange | Digital Signal Processor Co-Processing Buffer |
Use Scenario: PLC main processor writes I/O scan results to shared memory; motion controller reads and executes trajectory updates in real time. IC Role / Device Role / Timing Role: Slave SRAM serving as deterministic, low-latency data conduit between heterogeneous processors operating at different clock domains. Use Value: Asynchronous ports eliminate synchronization logic; 100 ns timing meets hard real-time deadlines for motion control loops. | Use Scenario: DSP offloads FFT or filtering tasks while host MCU manages peripherals; shared memory holds input samples and processed outputs. IC Role / Device Role / Timing Role: Dual-port buffer decoupling DSP and host timing domains; INT flags signal completion without CPU polling. Use Value: Reduces host CPU load by >40% vs. DMA-based alternatives; interrupt-driven transfers minimize latency jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C135-100AXC | 5 V, 1K × 8, 100 ns, 32-pin SOIC; no BUSY arbitration - requires external logic for MASTER/SLAVE | Lacks integrated port arbitration; unsuitable for glueless expansion with IDT7130 | Select only if board space constraints prohibit 48-pin FP48 and external arbitration logic is acceptable |
| IDT7142LA100JG | 1K × 16 dual-port, 100 ns, FP52 package; wider data bus, same LA retention and industrial temp | Provides 16-bit word access - reduces bus cycles but requires wider PCB traces and matching controller interface | Choose when system demands 16-bit data path and footprint increase is acceptable |
Compared with CY7C135-100AXC and IDT7142LA100JG, the 7140LA100J8 uniquely delivers 48-pin ceramic reliability, built-in BUSY-input arbitration for seamless IDT7130 pairing, and 2 V data retention - making it optimal for mission-critical industrial inter-processor links where timing determinism and power-fail resilience are mandatory.
Availability
7140LA100J8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, redundant control system memory, and industrial PLC data exchange requiring stable component supply across extended product lifecycles.
Supply support for 7140LA100J8 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 sensor solutions, now part of Renesas Electronics.
The IDT7130/7140 family was designed specifically for deterministic, low-latency inter-processor communication in industrial and military systems - emphasizing arbitration integrity, data retention, and wide-temperature reliability over raw density or speed.
FAQ
What is the function of BUSYL and BUSYR on the 7140LA100J8?
BUSYL and BUSYR are dedicated arbitration input pins on the 7140LA100J8. Unlike the master IDT7130, which drives BUSY as an open-drain output, the 7140LA100J8 accepts these signals to inhibit writes on the respective port. When BUSYL is driven LOW (e.g., by IDT7130), writes to the left port are internally blocked - ensuring deterministic resolution of simultaneous access to the same memory location. External pull-up resistors are required on both pins.
Does the 7140LA100J8 support true simultaneous read operations on both ports?
Yes, the 7140LA100J8 supports fully independent, asynchronous read operations on left and right ports with no timing dependency between them. Valid data appears on each port based solely on its own tAA, tACE, and tAOE timing parameters. BUSY signals are irrelevant during concurrent reads, and no arbitration delay is introduced - enabling true parallel data access for dual-CPU architectures.
How does the 2 V data retention mode work on the 7140LA100J8?
The 7140LA100J8 enters data retention mode when VCC drops to 2.0 V while chip enables (CEL/CER) remain asserted high. In this state, the device consumes ≤4000 µA (military/industrial grade) and maintains full memory content without refresh. This mode is exclusive to LA variants and is validated for indefinite retention at +25°C - critical for black-box logging and safe-state preservation after main power failure.
Can the 7140LA100J8 be used without a master IDT7130?
Yes, the 7140LA100J8 functions as a standalone dual-port SRAM. Its BUSY inputs default to inactive (pulled high), allowing unrestricted access to both ports. However, without a master IDT7130 driving BUSY, the device loses hardware-enforced arbitration - meaning external logic or software coordination is required to prevent write collisions during simultaneous access. The 7140LA100J8 retains all timing, retention, and power specifications in standalone mode.
What is the significance of the 'J8' suffix in 7140LA100J8?
The 'J8' suffix in 7140LA100J8 denotes the 48-pin Ceramic Flatpack (FP48) package with military-grade screening per MIL-PRF-38535 QML Class V. It specifies hermetic ceramic construction, side-brazed leads, and full temperature-range qualification (-55°C to +125°C), though the 'LA' prefix confirms industrial-grade (-40°C to +85°C) operation. This suffix distinguishes it from plastic DIP (J), PLCC (G), or TQFP (P) variants.
7140LA100J8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 8Kbit
- Memory Organization:
- 1K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 100ns
- Access Time:
- 100 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7140LA100J8 FAQ
1.How can I place an order for 7140LA100J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA100J8 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 7140LA100J8 reliable?
The price and inventory of 7140LA100J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA100J8 is usually 5 days.
3.What payment methods are accepted for 7140LA100J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA100J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA100J8?
7140LA100J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA100J8 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 7140LA100J8?
For technical support, including 7140LA100J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA100J8 requirements.
6.How does Aetrix verify that 7140LA100J8 is sourced from the original manufacturer or authorized distributors?
All 7140LA100J8 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 7140LA100J8 meets industry standards.
7.What is the process for return or replacement of 7140LA100J8?
All 7140LA100J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA100J8, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 7140LA100J8 part is unused and in its original packaging.
Return procedure for 7140LA100J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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