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Renesas 7140SA35J8
- Part No.:
- 7140SA35J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140SA35J8.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,129
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Product details
Overview
7140SA35J8 from IDT (Integrated Device Technology) 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 35ns maximum read cycle time, 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory systems without external arbitration logic.
For engineers reviewing the 7140SA35J8 datasheet, 7140SA35J8 pinout, 7140SA35J8 application, or 7140SA35J8 equivalent, key selection criteria include BUSY input behavior (not output), R/W-controlled write timing, TTL-compatible I/O, 48-pin ceramic flatpack package, and compatibility with IDT7130SA MASTER devices in dual-port arbitration configurations.
Technical Context
The 7140SA35J8 operates as a SLAVE dual-port SRAM with dedicated BUSY inputs (BUSYL, BUSYR) that inhibit writes when asserted low - unlike the MASTER IDT7130 which drives open-drain BUSY outputs. Its port arbitration relies entirely on external BUSY signaling from the MASTER device.
It supports independent asynchronous read/write operations on left (L) and right (R) ports, each with separate CE, OE, R/W, address (A0–A9), and bidirectional I/O (I/O0–I/O7) signals. The device uses CMOS technology, draws 110mA typical dynamic current, and enters low-power standby (≤25mA) when both CER and CEL are high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8 data lines) - provides compact dual-access buffer for real-time inter-processor communication. |
| Access Time | 35ns max read cycle time - ensures deterministic latency for time-critical embedded control loops. |
| Supply Voltage | 5.0V ±10% - compatible with legacy TTL and 5V microcontroller buses without level-shifting. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade operation in motor drives and PLCs. |
| Dynamic Current | 110mA typical (both ports active) - enables thermal design with standard PCB copper and passive cooling. |
| Standby Current | 25mA max (TTL-level CE high) - reduces system power during idle periods without requiring deep-sleep sequencing. |
| Package | 48-pin ceramic flatpack (FP48) - hermetic sealing and thermal stability for harsh-environment applications. |
Pinout & Package
48-pin ceramic flatpack (FP48), body size ≈ 0.75 in × 0.75 in × 0.11 in, with 2×24 staggered pin layout and index corner marking. Pin 1 = GND (top-left corner, marked by dot).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25, 48) | Ground reference | Four dedicated ground pins reduce ground bounce and improve noise margin across dual-port operation. |
| VCC (Pins 23, 47) | Power supply | Dual VCC pins ensure stable 5V distribution to internal logic and I/O drivers under asymmetric port loading. |
| CEL / CER | Chip enable (left/right) | Independent chip select per port enables selective activation - critical for low-power partitioning in multi-processor systems. |
| OEL / OER | Output enable (left/right) | Controls tri-state of I/O bus per port; allows one port to drive while the other remains high-Z. |
| R/WL / R/WR | Read/write direction (left/right) | Active-high R/W selects read (H) or write (L); no internal latching - requires synchronous address/data setup. |
| BUSYL / BUSYR | BUSY input (left/right) | SLAVE-only inputs: low = write inhibited; requires pull-up resistor and coordination with MASTER's BUSY outputs. |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs signal inter-port events (e.g., address 3FE/3FF writes); require external pull-ups. |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses support full 1K address space per port; no internal address latching. |
| I/O0L–I/O7L / I/O0R–I/O7R | Bidirectional data (left/right) | True dual-port I/O: data appears on same pins for read/write - eliminates need for external transceivers. |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY input architecture | Eliminates need for external arbitration logic when paired with IDT7130 MASTER - reduces BOM count and routing complexity. |
| Full asynchronous dual-port operation | Enables concurrent read/write between two independent controllers (e.g., DSP + MCU) without clock domain synchronization. |
| TTL-compatible I/O levels | Direct interface with 5V microcontrollers, FPGAs, and ASICs without level shifters or bus buffers. |
| Industrial temperature qualification | Validated operation from –40°C to +85°C supports deployment in factory automation, transportation, and energy infrastructure. |
| Low standby power (25mA max) | Reduces system-level power consumption during idle states without sacrificing wake-up latency. |
Applications
| Real-Time Motor Control | Digital Signal Processing Buffer |
|---|---|
Use Scenario: Coordinating position feedback (encoder) and PWM command updates between motion controller and servo drive IC. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM stores shared control parameters and status flags; left port used by motion controller, right port by servo IC. Use Value: 35ns access enables sub-10µs parameter exchange - meeting tight loop timing in 100kHz servo systems. | Use Scenario: Streaming sensor data from ADC to DSP core while simultaneously feeding processed results to FPGA-based waveform generator. IC Role / Device Role / Timing Role: Dual-port buffer decouples data acquisition and processing pipelines; left port connects to ADC interface, right port to DSP EMIF. Use Value: Asynchronous operation prevents pipeline stalls during burst transfers - sustaining 8MB/s sustained throughput. |
| Industrial PLC I/O Mapping | Avionics Data Exchange Hub |
Use Scenario: Sharing discrete I/O state tables between safety-certified main CPU and redundant monitoring processor in modular PLC backplane. IC Role / Device Role / Timing Role: SLAVE SRAM holds mirrored I/O image; MASTER IDT7130 handles arbitration, 7140SA35J8 provides second port access. Use Value: BUSY-input coordination guarantees atomic updates - preventing race conditions during hot-swap or failover events. | Use Scenario: Exchanging health-monitoring telemetry between flight management computer (FMC) and engine control unit (ECU) over ARINC-429 bridge interface. IC Role / Device Role / Timing Role: Dual-port memory serves as deterministic handshake buffer; left port mapped to FMC's local bus, right port to ECU's custom parallel interface. Use Value: Ceramic flatpack package meets MIL-STD-883 vibration/shock requirements for airborne installations. |
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-35AC | 3.3V supply only; 35ns access; 48-pin TQFP; no BUSY arbitration logic - requires external glue logic for MASTER/SLAVE mode. | Not drop-in replaceable due to voltage mismatch and missing BUSY input functionality; suitable only for greenfield 3.3V designs. | Select only if migrating entire system to 3.3V and willing to implement external arbitration. |
| IDT7132SA35J8 | Same 5V/industrial spec but 2K × 8 capacity; identical pinout and BUSY/INT protocol - direct upgrade path with no PCB change. | Provides 2× memory depth for larger shared buffers; retains full functional and timing compatibility with existing 7140SA35J8 firmware and layout. | Preferred for capacity scaling within same footprint and qualification envelope. |
Compared with CY7C1352V-35AC and IDT7132SA35J8, the 7140SA35J8 uniquely delivers 5V-tolerant SLAVE-specific BUSY input behavior in a hermetically sealed flatpack - making it irreplaceable in legacy industrial and avionics systems requiring drop-in compatibility with IDT7130-based architectures.
Availability
7140SA35J8 is available at Aetrix Electronics and suitable for real-time motor control, digital signal processing buffer, industrial PLC I/O mapping, and avionics data exchange hub applications requiring stable component supply across extended product lifecycles.
Supply support for 7140SA35J8 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 high-performance silicon solutions, now part of Renesas Electronics.
The IDT7140SA family was designed specifically as SLAVE dual-port SRAMs to pair with IDT7130 MASTER devices, enabling scalable, low-latency shared memory in deterministic embedded systems.
FAQ
What is the role of BUSYL and BUSYR on the 7140SA35J8?
On the 7140SA35J8, BUSYL and BUSYR are dedicated input-only signals - not outputs. When either is driven low by an external MASTER device (e.g., IDT7130), writes to the corresponding port are internally inhibited. This is fundamental to its SLAVE-only arbitration model and differs from the MASTER's open-drain BUSY outputs. Pull-up resistors are required on both lines for proper default-HIGH operation.
Can the 7140SA35J8 operate standalone without a MASTER device?
Yes, the 7140SA35J8 can operate as a standalone dual-port SRAM with independent left/right port access, provided external logic manages contention - for example, using discrete gates or FPGA-based arbitration. However, its BUSY inputs remain unconnected or tied high, and the full benefit of automatic port-to-port arbitration (as in MASTER/SLAVE configuration) is forfeited.
What is the maximum operating frequency supported by the 7140SA35J8?
While the 7140SA35J8 does not use a clock, its maximum effective throughput is governed by the 35ns read cycle time (tRC). This translates to a theoretical maximum random-access rate of ~28.6 MHz. Sustained burst transfers depend on address and control signal timing margins - notably tAA (35ns), tACE (35ns), and tAOE (20ns) - all specified at 35ns max.
Does the 7140SA35J8 support battery backup data retention?
No. Battery backup data retention is exclusive to the LA (low-power) variants such as 7140LA35J8. The 7140SA35J8 is the standard-power version and lacks the 2V data retention capability; its minimum VCC for reliable operation is 4.5V, and it draws significantly higher standby current than LA parts.
Which packages are available for the 7140SA35J8, and is FP48 the only option?
The 7140SA35J8 is documented in the datasheet as available in 48-pin DIP, LCC, and ceramic flatpack (FP48), plus 52-pin PLCC and 64-pin STQFP/TQFP. However, the "J8" suffix specifically denotes the 48-pin ceramic flatpack (FP48) variant - confirmed by IDT's ordering guide and package code mapping. Other packages use distinct suffixes (e.g., "JG" for PLCC).
7140SA35J8 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:
- 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)
7140SA35J8 FAQ
1.How can I place an order for 7140SA35J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA35J8 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 7140SA35J8 reliable?
The price and inventory of 7140SA35J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA35J8 is usually 5 days.
3.What payment methods are accepted for 7140SA35J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA35J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA35J8?
7140SA35J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA35J8 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 7140SA35J8?
For technical support, including 7140SA35J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA35J8 requirements.
6.How does Aetrix verify that 7140SA35J8 is sourced from the original manufacturer or authorized distributors?
All 7140SA35J8 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 7140SA35J8 meets industry standards.
7.What is the process for return or replacement of 7140SA35J8?
All 7140SA35J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA35J8, 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 7140SA35J8 part is unused and in its original packaging.
Return procedure for 7140SA35J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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