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Renesas 7140LA35CB
- Part No.:
- 7140LA35CB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7140LA35CB.pdf
- Description:
- IC SRAM 8KBIT PARALLEL SB48
- Quantity:
- Payment:
- Shipping:
Inventory:1,845
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Product details
Overview
7140LA35CB 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 35 ns maximum read cycle time, 1 mA typical standby current, and 2 V data retention capability. It enables error-free 16-bit-or-wider memory systems without external logic in industrial control and real-time signal processing.
For engineers reviewing the 7140LA35CB datasheet, 7140LA35CB pinout, 7140LA35CB application, or 7140LA35CB equivalent, this page delivers verified electrical specs, port arbitration behavior, BUSY input timing, battery backup operation, and drop-in alternatives for dual-port SRAM selection in deterministic embedded systems.
Technical Context
The 7140LA35CB operates as a SLAVE dual-port SRAM with dedicated BUSY inputs (BUSYL, BUSYR) that inhibit writes when asserted low-unlike the MASTER IDT7130's open-drain BUSY outputs. Its arbitration logic relies entirely on external MASTER coordination, not on-chip arbitration logic.
It supports independent TTL-compatible 5 V ±10% operation per port, with separate CE, OE, R/W, address, and I/O lines for left (L) and right (R) ports. Data retention at 2 V is exclusive to LA-grade variants and requires CMOS-level CE hold during low-voltage mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1K × 8 (1024 words × 8 bits), dual-port architecture with fully independent left/right access paths |
| Access Time (tRC) | 35 ns max - defines minimum read cycle interval; determines maximum sustained throughput in real-time buffering |
| Standby Current (ISB3) | 0.2 µA typical (full CMOS standby) - enables ultra-low-power battery-backed retention mode |
| Data Retention Voltage | 2.0 V min - allows operation from coin-cell or backup rail without active regulation |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives and PLCs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL logic rails; no level-shifting required |
| I/O Interface | TTL-compatible inputs/outputs - direct interfacing with legacy microcontrollers, FPGAs, and DSPs |
Pinout & Package
7140LA35CB is packaged in a 48-pin ceramic flatpack (FP48), measuring approximately 0.75 in × 0.75 in × 0.11 in, with gull-wing leads and hermetic sealing suitable for high-reliability industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Two dedicated ground pins reduce ground bounce and improve noise immunity across both ports |
| VCC (Pin 25) | Power supply | Single 5 V supply powers both ports; all VCC pins must be decoupled locally | CEL / CER | Chip enable (left/right) | Active-low enables memory access per port; controls dynamic vs. standby current states |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; high-Z state prevents bus contention during shared-data transfers |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of data flow on bidirectional I/O lines |
| BUSYL / BUSYR | Busy input (left/right) | Slave-only inputs; low = write inhibited on corresponding port during MASTER arbitration |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs used for inter-port signaling; require external pull-up for interrupt assertion |
| 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 | Data I/O (left/right) | Bidirectional 8-bit data paths; high-impedance when CE or OE inactive |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY input interface | Eliminates need for external arbitration logic when paired with IDT7130 MASTER, reducing BOM count and layout complexity |
| 2 V data retention | Enables nonvolatile storage during main power loss using simple backup battery circuitry without voltage regulators |
| Independent port control | Allows simultaneous read from one port and write to the other-critical for real-time FIFO and ping-pong buffering |
| Low standby current (1 µA typ.) | Extends battery life in portable test equipment and remote sensor nodes operating in sleep-wake cycles |
| Industrial temperature range | Validated operation from –40°C to +85°C ensures reliability in factory automation and outdoor infrastructure |
Applications
| Motor Control Feedback Buffer | Digital Signal Processor Co-Processor Memory |
|---|---|
Use Scenario: Real-time capture of encoder position and current-sense data while simultaneously feeding updated PWM parameters to an FPGA-based motion controller. IC Role / Device Role / Timing Role: Slave dual-port SRAM providing deterministic, contention-free data exchange between feedback acquisition and control update domains. Use Value: 35 ns access time ensures sub-microsecond latency for closed-loop updates; BUSY input prevents write corruption during concurrent reads. | Use Scenario: Offloading FFT coefficient storage and window buffer management from a TI C6000 DSP to reduce internal memory pressure and pipeline stalls. IC Role / Device Role / Timing Role: Asymmetric memory bridge enabling the DSP to write new coefficients while a dedicated hardware accelerator reads prior results. Use Value: Independent left/right timing eliminates synchronization overhead; 2 V retention preserves coefficients during DSP reset sequences. |
| Programmable Logic Controller (PLC) I/O Mapping | Avionics Sensor Data Aggregation |
Use Scenario: Storing discrete I/O status and analog channel scaling tables in a modular PLC backplane where CPU and I/O modules access shared configuration space. IC Role / Device Role / Timing Role: SLAVE device synchronized to a MASTER IDT7130 on the CPU side, enabling atomic register updates without software locks. Use Value: TTL compatibility ensures plug-and-play integration with legacy 5 V industrial buses; FP48 package withstands vibration and thermal cycling. | Use Scenario: Consolidating ADC samples from multiple inertial measurement units (IMUs) into a time-aligned buffer before transmission over ARINC 429. IC Role / Device Role / Timing Role: Dual-port SRAM acting as a deterministic staging buffer between asynchronous sensor interfaces and deterministic serial transmitter logic. Use Value: Industrial temp rating and hermetic FP48 packaging meet DO-160 environmental requirements; BUSY-controlled arbitration prevents sample loss during burst reads. |
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-35AXC | 3.3 V core, 35 ns access, 1K × 16 organization; no 2 V retention; different pinout and BUSY semantics | Requires level-shifting for 5 V systems; supports wider data path but lacks battery backup | Select only if migrating to 3.3 V architecture and widening data bus beyond 8 bits |
| IDT7134LA35JG | Same manufacturer, 2K × 8, 35 ns, LA grade, 64-pin TQFP; includes on-chip arbitration logic (MASTER mode) | Higher density and integrated arbitration-but incompatible pinout and larger footprint | Choose when expanding memory depth is prioritized over pin compatibility and board space constraints |
Compared with CY7C1352V-35AXC and IDT7134LA35JG, the 7140LA35CB uniquely combines 5 V TTL compatibility, 2 V data retention, and SLAVE-specific BUSY input behavior in a compact 48-pin FP48 package-making it irreplaceable in legacy industrial designs requiring zero-layout-change upgrades to existing IDT7130/7140 systems.
Availability
7140LA35CB is available at Aetrix Electronics and suitable for motor control feedback buffers, digital signal processor co-processor memory, programmable logic controller I/O mapping, avionics sensor data aggregation, and industrial real-time data logging requiring stable component supply across extended product lifecycles.
Supply support for 7140LA35CB 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 since 2019.
The IDT7130/7140 family was designed specifically for deterministic, low-latency dual-port memory expansion in industrial and military systems-emphasizing bus contention avoidance, battery-backed retention, and seamless MASTER/SLAVE scalability without glue logic.
FAQ
What is the function of BUSYL and BUSYR on the 7140LA35CB?
BUSYL and BUSYR are dedicated input signals on the 7140LA35CB that, when driven low by an external MASTER device (e.g., IDT7130), inhibit write operations on the corresponding left or right port. Unlike the MASTER's open-drain BUSY outputs, these are pure control inputs with no internal driver-requiring proper external pull-up and timing coordination per tWB and tWH specifications in the 7140LA35CB datasheet.
Does the 7140LA35CB support true simultaneous read/write across ports?
Yes-the 7140LA35CB supports fully asynchronous, independent read and write operations on left and right ports. However, simultaneous access to the same memory location triggers BUSY arbitration via the external MASTER; the 7140LA35CB itself does not resolve contention-it relies on BUSY input assertion to block conflicting writes, ensuring deterministic data integrity without internal arbitration logic.
Can the 7140LA35CB operate without a MASTER device like the IDT7130?
Yes-the 7140LA35CB can operate as a standalone 1K × 8 dual-port SRAM without a MASTER, provided BUSYL and BUSYR are held high (via pull-ups) and external logic manages address/data coherency. However, its SLAVE-optimized design-especially BUSY input dependency and lack of on-chip arbitration-means full contention resolution requires either a MASTER or custom external arbitration circuitry.
What is the significance of the "LA" suffix in 7140LA35CB?
The "LA" suffix denotes Low-power Active/Standby operation with Battery backup capability: it specifies 1 µA typical standby current (vs. 5 µA for SA grade) and guaranteed 2 V data retention-enabling nonvolatile storage during main power loss. This distinguishes it from the SA variant, which lacks retention and consumes higher standby current, making the 7140LA35CB essential for fail-safe industrial and avionics applications.
Is the 7140LA35CB pin-compatible with other IDT7140 speed grades like 7140LA25CB?
Yes-7140LA35CB is pin-compatible with all IDT7140LA variants (e.g., 7140LA25CB, 7140LA55CB) in the same FP48 package. Speed grade differences affect only AC timing parameters (e.g., tRC, tAA); DC characteristics, pin functions, and package footprint remain identical, allowing drop-in replacement for timing margin optimization or cost reduction without PCB revision.
7140LA35CB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-DIP (0.600", 15.24mm)
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 48-SIDE BRAZED
7140LA35CB FAQ
1.How can I place an order for 7140LA35CB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA35CB 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 7140LA35CB reliable?
The price and inventory of 7140LA35CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA35CB is usually 5 days.
3.What payment methods are accepted for 7140LA35CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA35CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA35CB?
7140LA35CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA35CB 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 7140LA35CB?
For technical support, including 7140LA35CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA35CB requirements.
6.How does Aetrix verify that 7140LA35CB is sourced from the original manufacturer or authorized distributors?
All 7140LA35CB 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 7140LA35CB meets industry standards.
7.What is the process for return or replacement of 7140LA35CB?
All 7140LA35CB units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA35CB, 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 7140LA35CB part is unused and in its original packaging.
Return procedure for 7140LA35CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA35CB Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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