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Renesas 7140SA55CB
- Part No.:
- 7140SA55CB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7140SA55CB.pdf
- Description:
- IC SRAM 8KBIT PARALLEL SB48
- Quantity:
- Payment:
- Shipping:
Inventory:3,669
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Product details
Overview
7140SA55CB 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. It features 55 ns maximum read/write cycle time, TTL-compatible 5V ±10% operation, and dual independent asynchronous ports with dedicated address, data, and control lines - enabling concurrent access in real-time communication buffers and digital signal processing subsystems.
For engineers reviewing the 7140SA55CB datasheet, 7140SA55CB pinout, 7140SA55CB application, or 7140SA55CB equivalent, this page delivers verified electrical specs, port arbitration behavior, BUSY input timing, industrial temperature support (–40°C to +85°C), and direct alternatives for 16-bit-or-wider memory system design.
Technical Context
The 7140SA55CB operates as a SLAVE dual-port SRAM: its BUSYL and BUSYR pins are inputs (not outputs), used to inhibit writes during contention when asserted low by a MASTER IDT7130. It lacks on-chip arbitration logic - all arbitration is externally managed via BUSY signaling from the MASTER.
It supports fully asynchronous, independent read/write operations on left (L) and right (R) ports, with separate CE, OE, R/W, address (A0–A9), and I/O (I/O0–I/O7) signals per port. The device requires external pull-up resistors on BUSY inputs and complies with MIL-PRF-38535 QML for military-grade reliability where specified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1K × 8 (1024 words × 8 bits), dual-port, asynchronous SRAM |
| Access Time | 55 ns max - defines minimum read/write cycle time for reliable timing closure at 18.2 MHz |
| Supply Voltage | 5.0 V ±10% - single-rail TTL-compatible operation; no dual-supply or level-shifting required |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Standby Current (ISB1) | 20 mA max (both ports CE-high) - enables low-power idle states in embedded controllers |
| BUSY Interface | Input-only (BUSYL/BUSYR) - accepts open-drain BUSY signals from MASTER IDT7130 to block conflicting writes |
| Package | 48-pin Ceramic Flatpack (FP48) - hermetically sealed, leaded, MIL-STD-883 qualified |
Pinout & Package
7140SA55CB is supplied in a 48-pin Ceramic Flatpack (FP48) package, measuring approximately 0.75 in × 0.75 in × 0.11 in, with side-brazed leads and hermetic sealing suitable for high-reliability industrial and military applications.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return for both ports; all GND pins must be connected to system ground plane |
| VCC | Power supply | 5V ±10% supply for core and I/O; all VCC pins require local 0.1 µF decoupling |
| CEL / CER | Chip Enable (Left/Right) | Active-low enable per port; disables I/O drivers and reduces current when high |
| OEL / OER | Output Enable (Left/Right) | Active-low control of output drivers; allows high-impedance tri-state during shared bus operation |
| R/WL / R/WR | Read/Write control (Left/Right) | High = read, low = write; determines direction of data flow on respective I/O bus |
| BUSYL / BUSYR | BUSY input (Left/Right) | Active-low write-inhibit signal from MASTER IDT7130; forces port into write-blocked state |
| INTL / INTR | Interrupt flag (Left/Right) | Open-drain output indicating inter-port communication event; requires external pull-up |
| A0L–A9L / A0R–A9R | Address inputs (Left/Right) | 10-bit address bus per port; supports full 1K-word addressing independently |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (Left/Right) | Bidirectional 8-bit data path per port; electrically isolated between ports |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port architecture | Enables simultaneous, independent access from two processors or DMA engines without external arbitration logic |
| SLAVE-specific BUSY interface | BUSYL/BUSYR inputs directly accept MASTER-generated contention signals - eliminates need for discrete glue logic |
| 55 ns cycle time | Supports real-time data exchange in DSP co-processing, video frame buffering, and telecom packet handling |
| TTL-compatible I/O | Direct interface with 5V microcontrollers, FPGAs, and ASICs without level translation |
| Industrial temperature range | Validated operation from –40°C to +85°C ensures reliability in factory automation and outdoor infrastructure |
Applications
| Telecom Line Card Buffering | DSP Co-Processor Memory |
|---|---|
|
Use Scenario: Dual-processor line card where one CPU handles protocol stack and another manages real-time packet assembly. IC Role / Device Role / Timing Role: SLAVE 7140SA55CB provides dedicated 8-bit data path for DSP-side memory access while MASTER IDT7130 services host CPU. Use Value: Eliminates bus contention and eliminates need for external arbitration logic - reducing BOM count and PCB area. |
Use Scenario: Real-time audio processing system requiring low-latency, deterministic memory access between ARM host and SHARC DSP. IC Role / Device Role / Timing Role: 7140SA55CB serves as SLAVE port in synchronized dual-access buffer, accepting BUSY-controlled write blocking from MASTER. Use Value: Guarantees atomic data handoff with ≤55 ns latency - critical for sub-100 µs audio frame deadlines. |
| Industrial PLC Data Exchange | Military Avionics Sensor Fusion |
|
Use Scenario: Programmable Logic Controller with separate I/O processor and motion control engine sharing sensor data. IC Role / Device Role / Timing Role: 7140SA55CB acts as SLAVE memory for motion controller port, receiving BUSY-synchronized updates from I/O processor (MASTER). Use Value: Prevents corrupted writes during concurrent reads - ensuring deterministic response in safety-critical motion sequences. |
Use Scenario: Radar signal processor requiring radiation-tolerant, high-reliability memory for ADC sample buffering and FFT staging. IC Role / Device Role / Timing Role: 7140SA55CB in FP48 ceramic package provides hermetic, MIL-PRF-38535 QML-compliant dual-port storage for sensor fusion pipeline. Use Value: Enables concurrent radar pulse capture (one port) and beamforming computation (other port) with guaranteed atomicity via BUSY handshake. |
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-55AXC | 55 ns, 1K × 16 organization, 3.3V core (5V tolerant I/O), TQFP-100 | Wider data bus; requires voltage translation for legacy 5V systems; no native BUSY arbitration | Select when 16-bit word width is mandatory and external arbitration logic is acceptable. |
| IDT7132LA55JGI | 55 ns, 2K × 8, LA variant with 2V data retention, PLCC-52, industrial temp | Higher density; battery backup capability; different pinout and package - not drop-in | Choose when extended data retention during power loss is required and board layout can accommodate PLCC-52. |
Compared with CY7C1352V-55AXC and IDT7132LA55JGI, the 7140SA55CB uniquely provides native SLAVE-mode BUSY input compatibility with IDT7130 MASTER devices - enabling seamless, logic-free 16-bit expansion in existing 5V industrial designs.
Availability
7140SA55CB is available at Aetrix Electronics and suitable for telecom line cards, DSP co-processing subsystems, industrial PLCs, and military avionics requiring stable component supply across extended lifecycle programs.
Supply support for 7140SA55CB 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, RF, and interface solutions for communications, computing, and industrial markets.
The IDT7140 family was designed specifically as SLAVE dual-port SRAMs to pair with IDT7130 MASTER devices - enabling scalable, error-free 16-bit-or-wider memory systems without external arbitration logic.
FAQ
What is the role of 7140SA55CB in a MASTER/SLAVE dual-port SRAM configuration?
The 7140SA55CB functions exclusively as a SLAVE device: it receives BUSY input signals (BUSYL/BUSYR) from a MASTER IDT7130 to inhibit writes during address contention. Unlike the MASTER, it contains no internal arbitration logic and relies entirely on external BUSY handshaking for conflict resolution - making it ideal for expanding data bus width in synchronized memory systems.
Does 7140SA55CB support battery backup or low-voltage data retention?
No. The 7140SA55CB is an SA-series part, meaning Standard Access with active power only. Battery backup and 2V data retention are exclusive to LA-series variants (e.g., 7140LA55CB). The SA version draws 20 mA max in standby (ISB1) but loses data when VCC drops below 2.0 V.
Can 7140SA55CB operate independently without a MASTER IDT7130?
Yes - the 7140SA55CB can function as a standalone dual-port SRAM. Its BUSY pins default to inactive (high) when unconnected (with pull-ups), allowing normal read/write operations on both ports. However, concurrent access to the same address will cause undefined data; external arbitration or careful software coordination remains necessary in standalone use.
What package type is used for 7140SA55CB, and is it RoHS compliant?
The 7140SA55CB is packaged in a 48-pin Ceramic Flatpack (FP48), a hermetically sealed, side-brazed package qualified to MIL-STD-883. Per IDT documentation, FP48 variants of the 7140SA series are exempt from RoHS due to leaded solder and ceramic construction - they comply with J-STD-609 Class 1 for lead-containing packages.
How does interrupt generation work on 7140SA55CB?
The 7140SA55CB supports port-to-port interrupts via INTL and INTR pins - open-drain outputs requiring external pull-up resistors. Writing to address 0x3FE on one port sets the interrupt flag on the opposite port (e.g., write to left port A0–A9 = 0x3FE asserts INTR); writing to 0x3FF clears it. Timing is validated to ≤45 ns interrupt set/reset delay at 55 ns speed grade.
7140SA55CB 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:
- 55ns
- Access Time:
- 55 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
7140SA55CB FAQ
1.How can I place an order for 7140SA55CB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA55CB 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 7140SA55CB reliable?
The price and inventory of 7140SA55CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA55CB is usually 5 days.
3.What payment methods are accepted for 7140SA55CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA55CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA55CB?
7140SA55CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA55CB 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 7140SA55CB?
For technical support, including 7140SA55CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA55CB requirements.
6.How does Aetrix verify that 7140SA55CB is sourced from the original manufacturer or authorized distributors?
All 7140SA55CB 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 7140SA55CB meets industry standards.
7.What is the process for return or replacement of 7140SA55CB?
All 7140SA55CB units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA55CB, 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 7140SA55CB part is unused and in its original packaging.
Return procedure for 7140SA55CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140SA55CB Tags
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M24C02-WMN6TP
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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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