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Renesas 7140LA35J
- Part No.:
- 7140LA35J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140LA35J.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,857
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Product details
Overview
7140LA35J 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 35ns max read cycle time, 1mW standby power, and 2V battery backup data retention. It enables error-free 16-bit-or-wider memory systems without external logic in industrial control and real-time DSP applications.
For engineers reviewing the 7140LA35J datasheet, 7140LA35J pinout, 7140LA35J application, or 7140LA35J equivalent, this page delivers verified electrical specs, BUSY-input arbitration behavior, TTL-compatible 5V operation, and direct substitution guidance for dual-port SRAM selection in deterministic real-time systems.
Technical Context
The 7140LA35J operates as a SLAVE dual-port SRAM with dedicated BUSY input pins (BUSYL, BUSYR) that inhibit writes when asserted low-unlike the MASTER IDT7130 which drives BUSY outputs. Its arbitration logic responds solely to address match and CE timing, requiring tAPS ≥5ns setup to prevent indeterminate BUSY assertion.
It supports independent R/W-controlled or CE-controlled write cycles on either port, with tWP = 25ns min, tWC = 35ns max, and port-to-port delays (tWDD ≤60ns, tDDD ≤35ns) critical for synchronized inter-processor communication. Battery retention at 2V is exclusive to LA-grade variants and validated only at TA = +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), enabling compact buffer or register-file implementations |
| Access Time | 35ns maximum read cycle time (tRC), defining worst-case latency for deterministic real-time response |
| Supply Voltage | 5.0V ±10% (4.5–5.5V), compatible with legacy TTL and 5V microcontroller buses |
| Standby Current | 1mW typical (ISB3 = 0.2mA at VCC = 5V), enabling ultra-low-power hold mode during system sleep |
| Data Retention | 2.0V minimum VCC for data retention (LA-only), allowing backup from coin-cell or supercapacitor |
| Operating Temp | –40°C to +85°C industrial range, qualified for factory automation and motor drive environments |
| Package | 48-pin ceramic flatpack (FP48), hermetically sealed for high-reliability aerospace and defense use |
Pinout & Package
48-pin ceramic flatpack (FP48) package with 0.75″ × 0.75″ body size and side-brazed leads; pin 1 index corner marked, all VCC and GND pins require local decoupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25, 48) | Ground reference | Four dedicated ground pins minimize ground bounce across high-speed dual-port switching |
| VCC (Pins 23, 47) | Power supply | Dual VCC pins reduce IR drop and improve noise immunity on 5V rail |
| CEL / CER | Chip enable (left/right) | Independent active-low enables allow selective port power-down without affecting other port operation |
| OEL / OER | Output enable (left/right) | Asynchronous output gating per port; high-Z state prevents bus contention during shared-memory access |
| R/WL / R/WR | Read/write direction (left/right) | TTL-compatible control; high = read, low = write - no internal latching required |
| BUSYL / BUSYR | Arbitration input (SLAVE) | Active-low BUSY inputs from MASTER inhibit writes on respective port during address conflict |
| INTL / INTR | Interrupt flag (open-drain) | Asymmetric interrupt signaling: INTL set by right-port write to A9–A0 = 3FEh; INTR set by left-port write to 3FFh |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit independent addressing per port; no internal address latching - fully combinatorial |
| I/O0L–I/O7L / I/O0R–I/O7R | Bi-directional data (left/right) | True dual-port I/O: simultaneous read on one port and write on the other to same or different addresses |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY input architecture | Eliminates need for external pull-up resistors and simplifies arbitration wiring versus MASTER devices |
| 2V battery data retention | Enables nonvolatile storage during main power loss without external EEPROM or flash |
| Full asynchronous dual-port operation | Permits independent clock domains (e.g., DSP + FPGA) to share memory without synchronization logic |
| Industrial temperature qualification | Guaranteed functionality from –40°C to +85°C supports deployment in uncontrolled enclosures |
| TTL-compatible interface | Direct connection to legacy 5V microcontrollers, FPGAs, and ASICs without level-shifting |
Applications
| Real-Time Motor Control | DSP-FPGA Co-Processing |
|---|---|
Use Scenario: Synchronized PWM update and current-sense feedback buffering between MCU and gate driver IC. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM provides deterministic, zero-latency shared memory between control loop (left port) and measurement capture (right port). Use Value: Eliminates software handshake overhead and guarantees sub-35ns memory access for 20kHz+ servo loops. | Use Scenario: Real-time image preprocessing pipeline where FPGA performs pixel filtering and DSP runs feature extraction. IC Role / Device Role / Timing Role: Acts as SLAVE buffer in MASTER/SLAVE pair, accepting filtered frame data from FPGA (right port) for DSP consumption (left port). Use Value: Enables concurrent write/read without arbitration logic, sustaining >20MB/s throughput at 35ns cycle time. |
| Redundant PLC Memory | Avionics Data Logger |
Use Scenario: Hot-swappable controller modules sharing configuration and I/O state in safety-critical industrial PLCs. IC Role / Device Role / Timing Role: SLAVE device in mirrored memory subsystem; receives updates from MASTER via BUSY-controlled writes. Use Value: Ensures atomic state transfer with hardware-enforced write inhibition during address conflicts. | Use Scenario: Recording flight sensor data during power interruption using backup battery. IC Role / Device Role / Timing Role: LA-grade SRAM retains last 1KB of telemetry (e.g., IMU, pressure) at 2V during main power loss. Use Value: Provides guaranteed 2V data retention without external nonvolatile memory or complex power-fail circuitry. |
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-35AXI | 3.3V core, 35ns access, 1K × 16 organization; no battery retention | Requires level-shifting for 5V systems; wider data bus reduces chip count but increases layout complexity | Select when migrating to 3.3V systems or needing 16-bit native width without MASTER/SLAVE pairing |
| IDT7134LA35J | 2K × 8 SLAVE variant with identical 35ns timing, 2V retention, and FP48 package | Double memory depth supports larger buffers; pinout differs - not drop-in compatible | Choose when 2KB capacity is required and board layout allows re-routing of address/data lines |
Compared with CY7C1352V-35AXI and IDT7134LA35J, the 7140LA35J uniquely combines 5V TTL compatibility, SLAVE-specific BUSY input behavior, and guaranteed 2V data retention in a proven industrial-qualified footprint - making it irreplaceable in legacy 5V deterministic systems requiring battery-backed dual-port operation.
Availability
7140LA35J is available at Aetrix Electronics and suitable for real-time motor control, avionics data logging, and redundant PLC memory systems requiring stable component supply across extended product lifecycles.
Supply support for 7140LA35J 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 memory, timing, and interface solutions, now part of Renesas Electronics.
The IDT7130/7140 family was designed specifically for deterministic, low-latency inter-processor communication in industrial automation, military computing, and telecom infrastructure - emphasizing hardware arbitration and battery-backed reliability over density or speed scaling.
FAQ
What is the role of 7140LA35J in a MASTER/SLAVE dual-port SRAM configuration?
The 7140LA35J 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 external MASTER coordination. This division eliminates discrete glue logic in 16-bit memory expansions and ensures full-speed operation without timing penalties.
Does 7140LA35J support true 2V data retention, and under what conditions?
Yes, 7140LA35J supports guaranteed 2.0V minimum VCC for data retention - a LA-grade exclusive feature. This is validated at TA = +25°C with CE held high (ISB3 condition); retention time is indefinite under those conditions, but actual duration at temperature extremes or lower voltage is not production-tested and requires system-level validation.
How does BUSY arbitration work on 7140LA35J compared to the MASTER IDT7130?
Unlike the IDT7130 which drives open-drain BUSY outputs requiring external pull-ups, the 7140LA35J has BUSY inputs that must be driven low by the MASTER to block writes. When BUSYL or BUSYR is low, corresponding port writes are internally inhibited regardless of R/W or CE state - a hardware-enforced lock essential for deterministic multi-processor access.
Can 7140LA35J operate with mixed 3.3V and 5V interfaces?
No - 7140LA35J is strictly a 5V TTL-compatible device (VIH = 2.2V min, VIL = 0.8V max). Interfacing with 3.3V logic requires level translation on all control, address, and data lines; its DC characteristics and AC timing are specified only for VCC = 4.5–5.5V, and operation outside this range voids parametric guarantees.
What package options are available for 7140LA35J, and is FP48 the only option for this speed grade?
The 7140LA35J is offered exclusively in the 48-pin ceramic flatpack (FP48) package per IDT documentation. While the broader 7140LA family includes DIP, LCC, PLCC, and TQFP variants, the 35ns speed grade (denoted by "35" in the part number) is qualified only in FP48 - a hermetic package selected for thermal stability and reliability in industrial/military applications.
7140LA35J 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:
- 35ns
- Access Time:
- 35 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)
7140LA35J FAQ
1.How can I place an order for 7140LA35J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA35J 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 7140LA35J reliable?
The price and inventory of 7140LA35J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA35J is usually 5 days.
3.What payment methods are accepted for 7140LA35J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA35J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA35J?
7140LA35J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA35J 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 7140LA35J?
For technical support, including 7140LA35J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA35J requirements.
6.How does Aetrix verify that 7140LA35J is sourced from the original manufacturer or authorized distributors?
All 7140LA35J 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 7140LA35J meets industry standards.
7.What is the process for return or replacement of 7140LA35J?
All 7140LA35J units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA35J, 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 7140LA35J part is unused and in its original packaging.
Return procedure for 7140LA35J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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