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Renesas 7140LA25J
- Part No.:
- 7140LA25J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140LA25J.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,803
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Product details
Overview
IDT7140LA25J from Integrated Device Technology (IDT) is a high-speed 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 25ns maximum read cycle time, 1mW typical standby power, and battery-backed data retention down to 2V - deployed in real-time industrial motion controllers requiring concurrent host and DSP access to shared buffer memory.
For engineers reviewing the IDT7140LA25J datasheet, IDT7140LA25J pinout, IDT7140LA25J application, or IDT7140LA25J equivalent, key selection criteria include BUSY input timing (tWB = 0ns), dual-port arbitration compatibility with IDT7130 master, 48-pin ceramic flatpack package mechanical fit, and LA-series low-power retention capability for fail-safe state preservation during brownout.
Technical Context
The IDT7140LA25J 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 IDT7130 master - enabling external arbitration logic or MASTER-driven BUSY signaling. It supports R/W-controlled and CE-controlled write cycles with tWP = 15ns minimum and tWC = 25ns maximum.
Its on-chip power management uses CE-level detection to enter full standby (ISB3 ≤ 0.2mA) when both ports' chip enables are held above VCC − 0.2V, and retains data at VCC = 2.0V with ICCDR ≤ 4000µA (military grade). All I/Os are TTL-compatible with VIH = 2.2V min and VIL = 0.8V max at VCC = 5.0V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), providing compact dual-access buffer for embedded control state tables. |
| Access Time | 25ns maximum read cycle time (tRC), enabling synchronization with 40MHz bus clocks in real-time systems. |
| Supply Voltage | 5.0V ±10% (4.5–5.5V), compatible with standard TTL logic rails without level-shifting. |
| Standby Current | 1mW typical (≈0.2mA at 5V), enabling ultra-low-power hold mode during processor sleep states. |
| Data Retention | 2.0V minimum VCC for data retention (LA version only), supporting backup via coin-cell or supercapacitor during main supply loss. |
| Operating Temp | −40°C to +85°C industrial range, qualified for under-hood automotive ECUs and factory-floor PLCs. |
| Package | 48-pin ceramic flatpack (FP48), hermetically sealed for high-reliability aerospace and defense applications. |
Pinout & Package
48-pin ceramic flatpack (FP48) package with 0.75″ × 0.75″ body size and side-brazed leads; pin 1 index marked, requires pull-up resistors on open-drain INTL/INTR outputs per datasheet Note 2.
| 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 0.1µF ceramic decoupling to minimize switching noise on dual-port I/Os. |
| CEL / CER | Chip enable (left/right) | Active-low enables; assertion initiates port access; deassertion places port in standby (ISB1/ISB2). |
| OEL / OER | Output enable (left/right) | Active-low controls I/O bus direction: LOW enables output drivers, HIGH places I/Os in high-Z. |
| R/WL / R/WR | Read/write control (left/right) | HIGH = read, LOW = write; must remain stable during address transitions per timing Note 1. |
| BUSYL / BUSYR | Arbitration input (SLAVE only) | Inputs driven by IDT7130 master's BUSY outputs; LOW inhibits writes to respective port. |
| INTL / INTR | Interrupt flag (open-drain) | Active-low flags for port-to-port communication; require external pull-up resistors (Note 2). |
| A0L–A9L / A0R–A9R | Address inputs (10-bit each) | Two independent 10-bit address buses support simultaneous access to same or different memory locations. |
| I/O0L–I/O7L / I/O0R–I/O7R | Bi-directional data (8-bit each) | Separate 8-bit data paths eliminate bus contention; no external transceivers needed for 16-bit expansion. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration interface | BUSY input protocol enables deterministic conflict resolution with IDT7130 master, eliminating need for external priority encoders. |
| Asynchronous operation | Independent left/right control allows host CPU and DSP to access shared memory without clock domain synchronization. |
| Battery backup retention | Operates down to 2.0V VCC with <4mA retention current, preserving critical state across power cycles in safety-critical systems. |
| TTL-compatible I/O | Direct interfacing with 5V microcontrollers and FPGAs without level translators or bus buffers. |
| Industrial temperature rating | Qualified from −40°C to +85°C, meeting extended-range requirements for motor drives and railway signaling hardware. |
Applications
| Real-Time Motion Control | Digital Signal Processing Buffer |
|---|---|
Use Scenario: Coordinating servo position updates between ARM-based motion controller and FPGA-based PWM generator. IC Role / Device Role / Timing Role: SLAVE dual-port RAM provides shared command queue and status register bank accessible concurrently by both processors. Use Value: 25ns access enables sub-10µs latency for position loop updates, meeting 100kHz servo update rate requirements. | Use Scenario: Storing FFT coefficients and filter taps in radar baseband processing chain. IC Role / Device Role / Timing Role: Dual-port buffer allows continuous ADC streaming into one port while DSP reads processed results from the other. Use Value: Eliminates DMA overhead and pipeline stalls, sustaining 40MSPS real-time throughput without frame drops. |
| Redundant Safety Controller | Avionics Data Logger |
Use Scenario: Maintaining synchronized watchdog state between primary and backup flight control units. IC Role / Device Role / Timing Role: Shared memory region mirrored across two independent SoCs using BUSY arbitration to prevent write collisions. Use Value: 2V data retention preserves last-known safe state during dual-supply failure, satisfying DO-254 Level A requirements. | Use Scenario: Capturing CAN bus telemetry during aircraft engine test runs with intermittent power. IC Role / Device Role / Timing Role: SLAVE RAM stores sensor data bursts while host MCU handles formatting and SD card writes. Use Value: Low 1mW standby power extends logging duration on backup battery; FP48 package withstands vibration and thermal shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1352V-25AXI | 3.3V core, 25ns access, 1K × 16 organization; no built-in BUSY arbitration logic. | Requires external logic for port conflict resolution; suited for new 3.3V designs but not drop-in replacement. | Select when migrating to lower-voltage systems and adding custom arbitration. |
| IDT7130LA25J | MASTER variant with on-chip arbitration logic and BUSY outputs; identical speed, package, and retention specs. | Used as controller in MASTER/SLAVE pairs; cannot substitute directly due to BUSY pin role reversal (output vs input). | Choose when designing standalone dual-port node or expanding to >16-bit width with IDT7140 slaves. |
Compared with CY7C1352V-25AXI and IDT7130LA25J, the IDT7140LA25J uniquely delivers SLAVE-specific BUSY input behavior and 2V retention in a proven 48-pin FP48 package - making it irreplaceable in legacy industrial systems relying on IDT's MASTER/SLAVE protocol stack.
Availability
IDT7140LA25J is available at Aetrix Electronics and suitable for real-time motion control, avionics data logging, redundant safety controllers, and digital signal processing buffer applications requiring stable component supply across extended product lifecycles.
Supply support for IDT7140LA25J 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
Integrated Device Technology (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs before its acquisition by Renesas Electronics in 2019.
The IDT7130/7140 family was designed specifically for high-reliability dual-access memory subsystems in military, industrial, and telecom infrastructure - emphasizing deterministic arbitration, low-power retention, and hermetic packaging.
FAQ
What is the function of BUSYL and BUSYR on the IDT7140LA25J?
BUSYL and BUSYR are dedicated input pins on the IDT7140LA25J - unlike the IDT7130 master, which drives them as outputs. When asserted LOW by an external MASTER (e.g., IDT7130), they inhibit write operations to the respective left or right port. This enables deterministic arbitration in MASTER/SLAVE configurations without external logic.
Does the IDT7140LA25J support battery backup operation?
Yes, the IDT7140LA25J supports battery backup data retention at VCC = 2.0V (minimum), drawing ≤4000µA in retention mode (military grade). This feature is exclusive to LA-series variants and is not available in SA versions. The 2V threshold ensures reliable state preservation during brownout conditions.
Which package type does the IDT7140LA25J use?
The IDT7140LA25J uses a 48-pin ceramic flatpack (FP48) package, with dimensions approximately 0.75″ × 0.75″ × 0.11″. It features side-brazed leads and is hermetically sealed - certified for high-reliability applications including aerospace, defense, and industrial control environments.
Can the IDT7140LA25J operate as a standalone dual-port RAM?
No - the IDT7140LA25J is explicitly designed as a SLAVE device in MASTER/SLAVE memory expansion systems. It lacks on-chip arbitration logic and relies on BUSY signals from an IDT7130 master (or equivalent external controller) to manage port conflicts. For standalone use, the IDT7130LA25J is the appropriate choice.
What is the maximum operating frequency supported by the IDT7140LA25J?
The IDT7140LA25J does not specify a maximum clock frequency because it is a fully asynchronous SRAM. Its performance is defined by timing parameters: 25ns maximum read cycle time (tRC), 15ns minimum write pulse width (tWP), and 20ns maximum BUSY access time (tBAA). System timing is governed by these parameters, not a clock signal.
7140LA25J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- 25ns
- Access Time:
- 25 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)
7140LA25J FAQ
1.How can I place an order for 7140LA25J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA25J 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 7140LA25J reliable?
The price and inventory of 7140LA25J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA25J is usually 5 days.
3.What payment methods are accepted for 7140LA25J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA25J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA25J?
7140LA25J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA25J 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 7140LA25J?
For technical support, including 7140LA25J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA25J requirements.
6.How does Aetrix verify that 7140LA25J is sourced from the original manufacturer or authorized distributors?
All 7140LA25J 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 7140LA25J meets industry standards.
7.What is the process for return or replacement of 7140LA25J?
All 7140LA25J units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA25J, 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 7140LA25J part is unused and in its original packaging.
Return procedure for 7140LA25J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA25J Tags
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