My Inquiry
My Account
Renesas 7140SA35J
- Part No.:
- 7140SA35J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140SA35J.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,902
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
IDT7140SA35J 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 35 ns maximum read cycle time, TTL-compatible 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 IDT7140SA35J datasheet, IDT7140SA35J pinout, IDT7140SA35J application, or IDT7140SA35J equivalent, key selection considerations include its BUSY input role (not output), slave-side arbitration behavior, 48-pin DIP/LCC/Flatpack package compatibility, and absence of on-chip port arbitration logic - distinguishing it from the MASTER IDT7130.
Technical Context
The IDT7140SA35J operates as a SLAVE dual-port SRAM with dedicated left (L) and right (R) ports, each featuring independent address (A0–A9), data (I/O0–I/O7), and control lines (CEL/CER, OEL/OER, R/WL/R/WR). BUSYL and BUSYR are inputs - not outputs - used to inhibit writes during contention, requiring external pull-up when driven by a MASTER IDT7130.
It supports port-to-port communication via INTL/INTR flags and relies entirely on external or MASTER-side arbitration; no on-chip arbitration logic exists. Timing parameters including tBDD (BUSY disable to valid data) and tWB (write to BUSY input) are defined specifically for SLAVE operation, with tWB = 0 ns and tBDD = 35 ns max at 35 ns speed grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), providing compact dual-access buffer storage |
| Access Time | 35 ns max read cycle time (tRC), enabling synchronization with 28.6 MHz bus clocks |
| Supply Voltage | 5.0 V ±10% (4.5–5.5 V), compatible with legacy TTL and 5V microcontroller buses |
| Operating Temp | –40°C to +85°C (industrial grade), validated for embedded control and instrumentation |
| Standby Current | 25 mA max (ISB1, TTL-level inputs), 1.0 mA max (ISB3, CMOS-level inputs) - critical for low-power sleep modes |
| Port Interface | Fully asynchronous dual-port: independent CE/OE/RW per port, no shared clock or handshake required |
| BUSY Role | BUSYL/BUSYR are inputs only - must be driven LOW by MASTER to block writes during address contention |
Pinout & Package
Package: 48-pin Ceramic Flatpack (FP48), 48-pin LCC (LC48), or 48-pin Plastic DIP (PDG48/SB48); body dimensions vary per variant but all share identical pin numbering and function mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | All GND pins (e.g., Pin 1, 24, 25, 48) must be connected to system ground plane for noise immunity |
| VCC | Power supply | All VCC pins (e.g., Pin 23, 47) require local 0.1 µF ceramic decoupling to suppress switching noise |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; drives ISB1/ISB2 standby current states when HIGH |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; sets high-impedance state when deasserted |
| R/WL / R/WR | Read/write direction (left/right) | HIGH = read, LOW = write; determines data flow direction on I/O bus |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses select one of 1024 locations independently per port |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data paths; high-impedance when OE inactive or CE inactive |
| BUSYL / BUSYR | BUSY input (left/right) | SLAVE-only inputs - asserted LOW by MASTER to stall writes during address collision |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs (require pull-up) signal inter-port events like flag set/clear |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous operation | Enables concurrent CPU and DMA access to same memory without clock domain bridging or FIFO buffering |
| MASTER/SLAVE expandability | Paired with IDT7130 allows seamless 16-bit+ data bus extension using native arbitration - no glue logic needed |
| BUSY-controlled write inhibition | Hardware-enforced conflict resolution: BUSY input blocks writes before data corruption occurs during contention |
| Low-power standby modes | ISB3 = 1.0 mA max (CMOS-level CE) enables battery-backed operation in power-constrained systems |
| TTL-compatible interface | Direct connection to 5V microcontrollers, FPGAs, and ASICs without level-shifting circuitry |
Applications
| Industrial PLC Data Exchange | Avionics Sensor Buffering |
|---|---|
Use Scenario: Real-time exchange of I/O status between main controller and safety monitor in redundant control systems. IC Role / Device Role / Timing Role: SLAVE IDT7140SA35J provides non-blocking dual-port access for simultaneous read (monitor) and write (controller) operations at 35 ns latency. Use Value: Eliminates software polling delays and guarantees deterministic response under worst-case contention via hardware BUSY signaling. |
Use Scenario: High-integrity buffering of inertial measurement unit (IMU) data for flight control computers with dual-redundant processors. IC Role / Device Role / Timing Role: IDT7140SA35J serves as fault-isolated memory buffer where left port connects to IMU interface and right port to primary/backup flight controllers. Use Value: Enables lock-step cross-checking of sensor data without bus arbitration overhead or timing jitter from shared memory access. |
| Medical Imaging Frame Store | Test Equipment Pattern Generator |
Use Scenario: Storing digitized ultrasound frames during acquisition while concurrently streaming to display engine. IC Role / Device Role / Timing Role: IDT7140SA35J acts as frame buffer SLAVE, accepting ADC data on one port and feeding video DAC on the other at full 35 ns throughput. Use Value: Sustains continuous 25+ FPS imaging without dropped frames, even during real-time histogram analysis on the same memory space. |
Use Scenario: Generating synchronized stimulus/response patterns in automated test equipment interfacing with DUTs via parallel buses. IC Role / Device Role / Timing Role: IDT7140SA35J stores test vectors on one port and delivers them to DUT while capturing responses on the second port - all within single-cycle timing budget. Use Value: Achieves sub-40 ns round-trip pattern turnaround, meeting IEEE 1149.1 boundary-scan timing margins without FPGA-based 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 |
|---|---|---|---|
| Cypress CY7C1371DV33-166BAXI | 3.3V core, 166 MHz (6 ns) access, QDR architecture, 132-ball BGA package | Targets high-speed networking and FPGA co-processing; incompatible voltage and footprint | Select only if migrating to 3.3V systems with need for >100 MHz burst bandwidth - not drop-in replacement |
| ISSI IS61LV10248-10TLI | Single-port, 10 ns access, 3.3V, 44-pin TSOP; no BUSY arbitration or dual-port capability | Suitable for cost-sensitive, non-contention applications where sequential access suffices | Use only when dual-port functionality is unnecessary - requires redesign to eliminate contention handling logic |
Compared with CY7C1371DV33-166BAXI and IS61LV10248-10TLI, IDT7140SA35J uniquely delivers 5V-tolerant, hardware-arbitrated dual-port operation in legacy-compatible through-hole or ceramic packages - essential for industrial upgrades where PCB re-spin is prohibited.
Availability
IDT7140SA35J is available at Aetrix Electronics and suitable for industrial PLC data exchange, avionics sensor buffering, and medical imaging frame store applications requiring stable component supply across extended product lifecycles.
Supply support for IDT7140SA35J 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 sensor signal conditioning solutions before its acquisition by Renesas Electronics in 2019.
IDT7140SA35J belongs to the IDT7130/7140 dual-port SRAM family, designed explicitly for high-reliability, asynchronous memory expansion in military, industrial, and telecom infrastructure where deterministic timing and hardware arbitration are mandatory.
FAQ
What is the function of BUSYL and BUSYR on the IDT7140SA35J?
BUSYL and BUSYR are dedicated input terminals on the IDT7140SA35J - not outputs. They receive active-low BUSY signals from a MASTER IDT7130 device to inhibit writes during address contention. When either line is pulled LOW, the corresponding port's write operation is blocked before data corruption occurs. This behavior is fundamental to the SLAVE role of IDT7140SA35J and differs from the MASTER's open-drain BUSY outputs.
Can IDT7140SA35J operate as a standalone dual-port RAM without IDT7130?
Yes, IDT7140SA35J can operate as a standalone dual-port SRAM, but external arbitration logic must be added to manage port contention since it lacks on-chip arbitration. Unlike the MASTER IDT7130, the IDT7140SA35J does not generate BUSY outputs or resolve conflicts autonomously. Its design assumes either external control or pairing with IDT7130 - making standalone use viable only in systems with guaranteed non-overlapping access patterns.
What package options are available for IDT7140SA35J?
IDT7140SA35J is offered in three industry-standard 48-pin packages: ceramic flatpack (FP48), leadless ceramic chip carrier (LC48), and plastic dual in-line package (PDG48/SB48). All share identical pinout and electrical characteristics. The FP48 and LC48 variants meet MIL-PRF-38535 QML requirements for military-grade reliability, while PDG48 targets commercial/industrial cost-sensitive designs.
Does IDT7140SA35J support battery backup data retention?
No, IDT7140SA35J does not support battery backup data retention. That feature is exclusive to the LA suffix variants (e.g., IDT7140LA35J), which guarantee data retention down to 2.0 V with typical ICCDR ≤ 100 µA. The "SA" in IDT7140SA35J denotes standard active power profile - 550 mW typical active power, 5 mW typical standby - optimized for performance over ultra-low-power hold mode.
How does interrupt handling work between ports on IDT7140SA35J?
IDT7140SA35J uses open-drain INTL and INTR pins to signal inter-port events. Writing to address 3FFH on the left port sets the right-port INTR flag; writing to 3FEH on the right port sets the left-port INTL flag. These flags remain asserted until cleared by a write to the complementary address (e.g., 3FFH on right port clears INTR). Both flags require external pull-up resistors and support handshaking between independent processors or peripherals sharing the dual-port memory space.
7140SA35J 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)
7140SA35J FAQ
1.How can I place an order for 7140SA35J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA35J 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 7140SA35J reliable?
The price and inventory of 7140SA35J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA35J is usually 5 days.
3.What payment methods are accepted for 7140SA35J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA35J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA35J?
7140SA35J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA35J 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 7140SA35J?
For technical support, including 7140SA35J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA35J requirements.
6.How does Aetrix verify that 7140SA35J is sourced from the original manufacturer or authorized distributors?
All 7140SA35J 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 7140SA35J meets industry standards.
7.What is the process for return or replacement of 7140SA35J?
All 7140SA35J units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA35J, 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 7140SA35J part is unused and in its original packaging.
Return procedure for 7140SA35J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140SA35J Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
