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Renesas 7140LA100PF
- Part No.:
- 7140LA100PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140LA100PF.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,099
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Product details
Overview
7140LA100PF from IDT 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 max read/write cycle time, 1 µA full-standby current (CMOS-level CE), and 2 V data retention - used in real-time avionics bus arbitration and military-grade dual-CPU interlock buffers.
For engineers reviewing the 7140LA100PF datasheet, 7140LA100PF pinout, 7140LA100PF application, or 7140LA100PF equivalent, this page delivers verified timing parameters, BUSY-input arbitration behavior, battery-backed retention specs, and direct SLAVE-side functional constraints for deterministic dual-port memory design.
Technical Context
The 7140LA100PF operates as a SLAVE dual-port SRAM with BUSY input pins (BUSYL/BUSYR) that inhibit writes when asserted low, requiring external arbitration from a MASTER IDT7130. It lacks on-chip arbitration logic and does not drive BUSY outputs.
Its 100 ns speed grade supports tRC = 100 ns, tWC = 100 ns, tBDD = 65 ns, and tWDD = 120 ns, with separate CE/OE/R/W controls per port and TTL-compatible 5 V ±10% supply - all specified over –55°C to +125°C (military grade).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), enabling compact dual-access buffer storage without external width expansion. |
| Access Time | 100 ns max read cycle time (tRC), defining worst-case latency for deterministic real-time memory reads. |
| Standby Current | 1 µA typical full-standby (ISB3) with CMOS-level CE high, critical for battery-backed operation at 2 V. |
| Data Retention | 2.0 V minimum VCC for data retention (VDR), allowing backup from coin-cell or supercapacitor during main power loss. |
| Operating Temp | –55°C to +125°C (military grade), qualified per MIL-PRF-38535 QML for harsh-environment deployment. |
| Supply Voltage | 5.0 V ±10%, compatible with legacy 5 V TTL logic families without level-shifting circuitry. |
| Port Interface | Fully asynchronous dual ports (left/right), each with independent address (A0–A9), data (I/O0–I/O7), and control (CE/OE/R/W) lines. |
Pinout & Package
7140LA100PF is packaged in a 48-pin ceramic flatpack (FP48), measuring approximately 0.75 in × 0.75 in × 0.11 in, with through-hole mounting and hermetic sealing for military reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Two dedicated ground pins ensure low-impedance return paths for both ports' I/O and core logic. |
| VCC (Pin 25) | Power supply | Single 5 V supply powers entire device; all VCC pins must be connected to stable 5 V ±10% source. |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; when high, port enters standby (ISB1/ISB2/ISB3/ISB4 modes apply). |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; when high, data bus enters high-impedance state for bus sharing. |
| R/WL / R/WR | Read/write direction (left/right) | High = read, low = write; controls internal data path direction independently per port. |
| BUSYL / BUSYR | Arbitration input (left/right) | Slave-only inputs: low = write inhibited on corresponding port; requires pull-up resistor externally. |
| INTL / INTR | Interrupt flag output (left/right) | Open-drain outputs signaling inter-port events (e.g., flag set/clear); require external pull-up resistors. |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses selecting one of 1024 memory locations per port; no internal address latching. |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data buses; driven only when OE and CE are active low and R/W is appropriate. |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only architecture | Eliminates need for external arbitration logic when paired with IDT7130 MASTER, reducing BOM count and PCB area. |
| 2 V data retention | Enables seamless failover to backup power without data loss during main supply interruption - validated at TA = +25°C. |
| Open-drain INT outputs | Supports wired-OR interrupt busing across multiple dual-port devices, simplifying multi-CPU interrupt aggregation. |
| MIL-PRF-38535 QML compliance | Guarantees screening, testing, and traceability for defense/aerospace applications requiring highest reliability tiers. |
| Asynchronous dual-port operation | Allows independent, unsynchronized read/write access from two processors or buses - no clock synchronization required. |
Applications
| Avionics Data Bus Buffer | Military Radar Signal Processing |
|---|---|
Use Scenario: Dual-CPU system where flight control processor writes sensor data while navigation CPU reads same memory location with guaranteed coherency. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM receiving BUSY arbitration signals from MASTER IDT7130 to prevent simultaneous write collisions. Use Value: Eliminates software-based semaphores and guarantees hardware-level atomicity for safety-critical data exchange. | Use Scenario: Real-time radar front-end buffering raw ADC samples between acquisition FPGA and DSP engine. IC Role / Device Role / Timing Role: Asynchronous memory interface enabling concurrent sampling and processing without pipeline stalls. Use Value: 100 ns access time ensures sub-microsecond latency for time-sensitive pulse-Doppler processing loops. |
| Secure Crypto Key Storage | Tactical Radio Protocol Stack |
Use Scenario: Storing cryptographic keys with tamper-resilient retention during brownout conditions in field-deployed comms gear. IC Role / Device Role / Timing Role: Battery-backed SRAM retaining keys at 2 V VCC while main 5 V rail is offline. Use Value: Meets MIL-STD-810G Section 516.6 shock/vibration requirements via hermetic FP48 package and low-retention-voltage design. | Use Scenario: Inter-processor messaging between baseband and RF subsystems in software-defined radio transceivers. IC Role / Device Role / Timing Role: Dual-port memory implementing lock-free ring buffers using INTL/INTR flags for zero-latency handshaking. Use Value: Open-drain interrupt outputs allow direct connection to shared interrupt controller without additional logic. |
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, but uses 3-state BUSY outputs (not inputs) and lacks 2 V data retention. | Requires external arbitration logic; unsuitable for battery backup scenarios. | Select only if MASTER/SLAVE topology is unnecessary and MIL-spec retention is not required. |
| AS7C31025B-100JCIN | 3.3 V core, 1K × 8, 100 ns, no BUSY arbitration support, no military temp range. | Not pin-compatible; incompatible voltage domain; limited to commercial temperature range. | Consider only for cost-sensitive commercial designs without harsh-environment or dual-CPU coordination needs. |
Compared with CY7C135-100AXC and AS7C31025B-100JCIN, the 7140LA100PF uniquely provides SLAVE-specific BUSY input behavior, 2 V data retention, and MIL-PRF-38535 qualification - making it irreplaceable in certified avionics and defense systems requiring hardware-enforced memory coherency and fail-safe retention.
Availability
7140LA100PF is available at Aetrix Electronics and suitable for avionics data buffering, military radar signal processing, secure crypto key storage, and tactical radio protocol stack applications requiring stable component supply across extended product lifecycles.
Supply support for 7140LA100PF 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, and interface solutions, now part of Renesas Electronics.
The IDT7140 LA family was designed specifically as SLAVE dual-port SRAMs to pair with IDT7130 MASTER devices, enabling scalable, error-free 16-bit+ memory systems without discrete glue logic.
FAQ
What is the role of 7140LA100PF in a MASTER/SLAVE dual-port memory configuration?
The 7140LA100PF functions exclusively as a SLAVE device: it accepts BUSY input signals (BUSYL/BUSYR) from an external MASTER (e.g., IDT7130) to inhibit writes during contention, lacks on-chip arbitration logic, and relies on the MASTER for priority resolution. This architecture eliminates external logic in 16-bit+ word-width expansions. The 7140LA100PF is not usable as a standalone dual-port without a MASTER partner.
Does 7140LA100PF support battery backup operation, and what are the conditions?
Yes, the 7140LA100PF supports battery backup with guaranteed data retention at VCC = 2.0 V (VDR), consuming ≤4000 µA (military grade) or ≤1500 µA (commercial grade) in retention mode. This requires CE held high (CMOS-level), ambient temperature at +25°C, and is not production tested but guaranteed by characterization. The 7140LA100PF does not retain data below 2.0 V.
What is the meaning of BUSYL and BUSYR pins on 7140LA100PF, and how must they be connected?
On the 7140LA100PF, BUSYL and BUSYR are dedicated input-only pins (not outputs). When pulled low, they disable writes on the corresponding port. They must be externally pulled up to VCC via resistors (per datasheet Note 2) and driven low by a MASTER IDT7130's open-drain BUSY outputs. The 7140LA100PF does not drive these pins - doing so violates its SLAVE-only functional definition.
Can 7140LA100PF operate across the full military temperature range, and what qualifications apply?
Yes, the 7140LA100PF is rated for –55°C to +125°C and manufactured in compliance with MIL-PRF-38535 QML Class V, including screening, burn-in, and lot acceptance testing. Its DC/AC specifications - including ISB3 = 1 µA standby, tRC = 100 ns, and VDR = 2.0 V - are all guaranteed across this full range per the official IDT datasheet revision dated Jul.12.21.
Is 7140LA100PF pin-compatible with other speed grades like 7140LA55PF or 7140LA25PF?
Yes, all IDT7140LA-xPF variants (including 7140LA100PF, 7140LA55PF, 7140LA25PF) share identical FP48 pinout, electrical interface, and functional behavior - only AC timing parameters differ. A board designed for 7140LA100PF can accept any lower-speed LA-grade variant without layout or firmware changes, though timing margins must be re-verified for the selected speed grade.
7140LA100PF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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:
- 64-TQFP (14x14)
7140LA100PF FAQ
1.How can I place an order for 7140LA100PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA100PF 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 7140LA100PF reliable?
The price and inventory of 7140LA100PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA100PF is usually 5 days.
3.What payment methods are accepted for 7140LA100PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA100PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA100PF?
7140LA100PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA100PF 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 7140LA100PF?
For technical support, including 7140LA100PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA100PF requirements.
6.How does Aetrix verify that 7140LA100PF is sourced from the original manufacturer or authorized distributors?
All 7140LA100PF 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 7140LA100PF meets industry standards.
7.What is the process for return or replacement of 7140LA100PF?
All 7140LA100PF units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA100PF, 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 7140LA100PF part is unused and in its original packaging.
Return procedure for 7140LA100PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA100PF Tags
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