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Renesas 7140SA100L48B
- Part No.:
- 7140SA100L48B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-LCC
- Datasheet:
-
7140SA100L48B.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 48LCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
7140SA100L48B 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 100ns max read/write 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 7140SA100L48B datasheet, 7140SA100L48B pinout, 7140SA100L48B application, or 7140SA100L48B equivalent, key selection criteria include BUSY input behavior (not output), absence of on-chip arbitration logic, compatibility with IDT7130 MASTER devices, and 48-pin ceramic flatpack (FP48) packaging for high-reliability embedded control and real-time inter-processor communication.
Technical Context
The 7140SA100L48B 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 resistors when driven by IDT7130 MASTER BUSY outputs.
It supports port-to-port interrupt signaling via INTL/INTR and uses open-drain BUSY inputs with 0.5V max low-level voltage at 16mA sink current. The device lacks on-chip arbitration logic (exclusive to IDT7130 MASTER), relying entirely on external BUSY handshaking for conflict resolution in multi-port memory systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), providing compact dual-access buffer for real-time data exchange between two processors or subsystems. |
| Access Time | 100ns maximum read/write cycle time - defines minimum time between successive valid accesses on same port under worst-case industrial conditions. |
| Supply Voltage | 5.0V ±10% (4.5V–5.5V) - requires single TTL-compatible rail; no separate I/O or core voltage rails needed. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including motor control, PLCs, and avionics subsystems. |
| Standby Current | 20mA max (ISB1, TTL-level CE high) - determines power budget during idle periods in battery-sensitive or thermally constrained designs. |
| Dynamic Current | 110mA typical (ICC, both ports active) - sets thermal design margin and regulator sizing for continuous dual-port operation. |
| Package | 48-pin ceramic flatpack (FP48) - hermetic, high-reliability package with 0.75″ × 0.75″ footprint suitable for military and aerospace applications. |
Pinout & Package
48-pin ceramic flatpack (FP48) package with 0.050″ lead pitch, body size ≈ 0.75″ × 0.75″ × 0.11″, and index mark at Pin 1 (top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25, 48) | Ground reference | Four dedicated ground pins reduce ground bounce and improve noise immunity across high-speed dual-port operation. |
| VCC (Pins 23, 47) | Power supply | Two VCC pins ensure stable 5V distribution to internal arrays and I/O drivers; must be decoupled locally. |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; when high, places port in standby mode with ISB1/ISB2 current draw. |
| OEL / OER | Output enable (left/right) | Active-low controls I/O bus direction: low = read enabled (data out), high = high-Z (write or tristate). |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; must be stable before CE assertion to avoid bus contention or invalid data capture. |
| BUSYL / BUSYR | BUSY input (left/right) | Open-drain inputs requiring external pull-up; low = write inhibited on corresponding port during address contention. |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs indicating port-specific event (e.g., write to address 0x3FE/0x3FF); require pull-up for logic-H level. |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses selecting one of 1024 memory locations per port; asynchronous and independent. |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data paths; direction controlled by R/W and OE; high-Z when disabled or during write setup. |
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 in 16-bit+ memory expansions. |
| BUSY input handshaking | Enables deterministic resolution of simultaneous access to same address - critical for deterministic real-time inter-processor communication. |
| Asynchronous dual-port operation | Allows independent, unsynchronized reads/writes on left and right ports - essential for lock-free data exchange between heterogeneous processors. |
| TTL-compatible interface | Direct connection to legacy 5V microcontrollers, FPGAs, and ASICs without level-shifting circuitry. |
| Industrial temperature rating | Validated operation from –40°C to +85°C ensures reliability in harsh environments such as factory automation and transportation systems. |
Applications
| Real-Time Inter-Processor Communication | Digital Signal Processor (DSP) Co-Processing |
|---|---|
Use Scenario: Two microcontrollers exchange sensor fusion data and control commands via shared memory without software locks or polling overhead. IC Role / Device Role / Timing Role: 7140SA100L48B serves as SLAVE dual-port RAM, receiving write requests from MASTER (IDT7130) and enabling zero-latency read access by secondary controller. Use Value: Eliminates CPU cycles spent on semaphore management; 100ns access ensures sub-microsecond inter-core data transfer latency. | Use Scenario: A DSP offloads FFT computation while a host MCU manages I/O and scheduling; results and parameters are passed through shared memory. IC Role / Device Role / Timing Role: 7140SA100L48B provides isolated, non-blocking data path between DSP and host - left port for parameter upload, right port for result download. Use Value: Sustains full 100ns throughput on both ports simultaneously, preventing pipeline stalls during burst data transfers. |
| Avionics Data Concentrator | Programmable Logic Controller (PLC) I/O Buffer |
Use Scenario: Multiple sensor modules feed time-critical flight data into a central concentrator unit operating under DO-254 constraints. IC Role / Device Role / Timing Role: 7140SA100L48B acts as fault-isolated buffer between sensor interface ASIC and safety-critical processing unit, using BUSY handshaking to guarantee atomic updates. Use Value: Ceramic FP48 package meets MIL-PRF-38535 QML requirements; 100ns timing ensures deterministic response within 1ms control loops. | Use Scenario: Industrial PLC backplane routes I/O status and command data between CPU and modular I/O cards with strict jitter limits. IC Role / Device Role / Timing Role: 7140SA100L48B implements dual-port register file - left port mapped to CPU address space, right port connected to fieldbus controller for cyclic data exchange. Use Value: Asynchronous operation prevents bus locking during fieldbus arbitration; 48-pin FP48 supports conformal coating and long-term thermal cycling stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1352BV33-100AXI | 3.3V supply, 100MHz synchronous interface, 1K × 16 organization - requires clock and control logic not needed by 7140SA100L48B. | Targets modern low-voltage FPGA-based systems; incompatible with 5V TTL buses and asynchronous timing models. | Select only if migrating to 3.3V architecture and accepting added interface complexity. |
| IDT7130SA100L48B | MASTER variant with on-chip arbitration logic, BUSY outputs (open-drain), and INT flag generation - not pin-compatible due to differing BUSY pin roles. | Used as primary memory controller in MASTER/SLAVE pairs; cannot substitute directly for SLAVE role without redesigning BUSY routing. | Required when building new MASTER/SLAVE system; not a drop-in replacement for 7140SA100L48B in existing SLAVE positions. |
Compared with CY7C1352BV33-100AXI and IDT7130SA100L48B, the 7140SA100L48B uniquely delivers 5V asynchronous dual-port operation with dedicated SLAVE semantics - preserving legacy system timing, eliminating clock domain crossing, and enabling direct replacement in established industrial designs.
Availability
7140SA100L48B is available at Aetrix Electronics and suitable for real-time inter-processor communication, avionics data concentrators, and programmable logic controller (PLC) I/O buffers requiring stable component supply across extended production lifecycles.
Supply support for 7140SA100L48B 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 semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions, now part of Renesas Electronics.
The IDT7130/7140 family was designed specifically for deterministic, low-latency dual-processor memory sharing in industrial control, military computing, and telecommunications infrastructure - emphasizing asynchronous operation, BUSY-based arbitration, and ruggedized packaging.
FAQ
What is the function of BUSYL and BUSYR on the 7140SA100L48B?
BUSYL and BUSYR are open-drain inputs on the 7140SA100L48B - unlike the IDT7130 MASTER, which drives them as outputs. When pulled low by an external MASTER device (e.g., IDT7130), they inhibit writes to the corresponding port during address contention. External 4.7kΩ pull-up resistors to VCC are required for proper logic-H default state.
Can the 7140SA100L48B operate as a standalone dual-port RAM without a MASTER device?
Yes, the 7140SA100L48B can operate independently with both ports fully functional for reads and writes - but it lacks on-chip arbitration logic. Without an external MASTER (e.g., IDT7130) or discrete arbitration circuitry, simultaneous access to the same memory location may result in undefined data or bus contention; BUSY inputs remain unasserted and provide no protection.
What is the significance of the "L48B" suffix in 7140SA100L48B?
The "L48B" suffix denotes the package type and revision: "L" indicates ceramic flatpack (FP48), "48" specifies 48 pins, and "B" identifies a specific manufacturing revision or screening level consistent with IDT's ordering nomenclature for industrial-grade devices in hermetic packages.
Does the 7140SA100L48B support battery backup or data retention below 5V?
No - only the LA (low-power) variants (e.g., 7140LA100L48B) support 2V data retention. The 7140SA100L48B is the standard-power version with minimum VCC of 4.5V; operation below this voltage risks data loss and is outside specified operating conditions.
How does interrupt generation work on the 7140SA100L48B?
Interrupts are generated by writing to specific addresses: writing to A0–A9 = 0x3FE sets the INTL flag (left port), and writing to 0x3FF sets the INTR flag (right port). These flags are open-drain outputs requiring external pull-ups; they remain asserted until cleared by a write to the same address with opposite data polarity, as defined in Truth Table II.
7140SA100L48B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-LCC
- 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:
- 100ns
- Access Time:
- 100 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LCC (14.22x14.22)
7140SA100L48B FAQ
1.How can I place an order for 7140SA100L48B through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA100L48B 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 7140SA100L48B reliable?
The price and inventory of 7140SA100L48B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA100L48B is usually 5 days.
3.What payment methods are accepted for 7140SA100L48B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA100L48B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA100L48B?
7140SA100L48B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA100L48B 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 7140SA100L48B?
For technical support, including 7140SA100L48B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA100L48B requirements.
6.How does Aetrix verify that 7140SA100L48B is sourced from the original manufacturer or authorized distributors?
All 7140SA100L48B 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 7140SA100L48B meets industry standards.
7.What is the process for return or replacement of 7140SA100L48B?
All 7140SA100L48B units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA100L48B, 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 7140SA100L48B part is unused and in its original packaging.
Return procedure for 7140SA100L48B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140SA100L48B Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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