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Renesas 7142SA55C
- Part No.:
- 7142SA55C
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7142SA55C.pdf
- Description:
- IC SRAM 16KBIT PARALLEL SB48
- Quantity:
- Payment:
- Shipping:
Inventory:4,176
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Product details
Overview
7142SA55C from IDT is a 2K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion architectures, supporting independent asynchronous read/write access on left and right ports with 55 ns maximum read cycle time (tRC), TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It serves as the data-width-expansion companion to the IDT7132SA master in 16-bit-or-wider systems.
For engineers reviewing the 7142SA55C datasheet, 7142SA55C pinout, 7142SA55C application, or 7142SA55C equivalent, key selection considerations include its BUSY input functionality (not output), absence of on-chip arbitration logic, compatibility with IDT7132SA-based width expansion, and support for 48-pin DIP/LCC/Flatpack and 52-pin PLCC packages.
Technical Context
The 7142SA55C implements two fully independent address/data/control interfaces - left port (A0L–A10L, I/O0L–I/O7L, CEL/OEL/R/WL/BUSYL) and right port (A0R–A10R, I/O0R–I/O7R, CER/OER/R/WR/BUSYR) - enabling concurrent access without software coordination. Its BUSY pins function strictly as inputs, requiring external assertion from a master IDT7132 to inhibit writes during address contention.
It lacks internal arbitration logic and relies entirely on external BUSY signaling for conflict resolution; write operations are gated internally when BUSY is low. The device supports full standby power-down via CE control and operates with CMOS-level input thresholds and TTL-compatible output drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8 bits per word), providing 16,384 total bits of fast static RAM storage |
| Access Time (tRC) | 55 ns max - defines minimum time between successive read cycles; enables high-throughput data exchange in real-time systems |
| Supply Voltage | 5.0 V ±10% - single-rail TTL-compatible operation; eliminates need for voltage translation in legacy 5V bus designs |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and transportation electronics |
| Standby Current (ISB3) | 0.2 µA typical (LA version), 15 µA max (SA version) - ultra-low quiescent draw during CE-inactive state for power-sensitive applications |
| BUSY Function | Input-only (not output) - accepts external BUSY signal from IDT7132 master to block writes during port-to-port address conflicts |
| Package Options | 48-pin PDG/SB48 DIP, LC48 LCC, FP48 Flatpack, and 52-pin PLG52 PLCC - supports through-hole and surface-mount assembly |
Pinout & Package
7142SA55C is available in multiple 48-pin and 52-pin packages: PDG48/SB48 (DIP), LC48 (LCC), FP48 (Flatpack), and PLG52 (PLCC). All variants share identical pin functions and signal assignments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable controlling port activation; drives port into low-power standby when high |
| OEL / OER | Output Enable (Left / Right) | Active-low control for tri-state output drivers; allows shared bus usage without external bus transceivers |
| R/WL / R/WR | Read/Write Control (Left / Right) | High = read, low = write; determines data direction on I/O lines for each port independently |
| BUSYL / BUSYR | BUSY Input (Left / Right) | Active-low input that gates internal write logic - write is inhibited when asserted, preventing data corruption during contention |
| A0L–A10L / A0R–A10R | Address Inputs (Left / Right) | 11-bit address buses selecting one of 2048 memory locations per port; no inter-port address dependency |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (Left / Right) | Bidirectional 8-bit data paths; high-impedance when OE or CE inactive, enabling multi-port bus sharing |
| VCC / GND | Power Supply | Single 5V supply with multiple VCC/GND pins distributed across package for noise reduction and stable decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port architecture with independent control | Enables simultaneous read/write operations on separate buses - critical for real-time FIFOs, video frame buffers, and CPU-peripheral bridging |
| SLAVE-only BUSY interface | Accepts external BUSY from IDT7132 master to enforce deterministic write arbitration without added logic or firmware overhead |
| 55 ns read cycle time (tRC) | Supports sustained data throughput up to ~18.2 MB/s per port in burst-mode applications like digital signal processing buffers |
| Low-power standby modes | ISB3 ≤ 15 µA (SA) or 5 µA (LA) at full CMOS-level disable - extends battery life in backup-memory or always-on monitoring systems |
| TTL-compatible I/O | Direct interfacing with legacy 5V microcontrollers, FPGAs, and ASICs without level-shifting circuitry |
| Industrial temperature qualification | Validated operation from –40°C to +85°C - suitable for embedded control in harsh environments including motor drives and industrial PLCs |
Applications
| Video Frame Buffering | Real-Time Data Acquisition |
|---|---|
|
Use Scenario: Capturing and displaying live video streams where one port writes incoming pixel data while the other reads for display refresh. IC Role / Device Role / Timing Role: 7142SA55C acts as SLAVE in a dual-port buffer paired with IDT7132SA master, enabling seamless ping-pong memory switching without CPU intervention. Use Value: Eliminates frame tearing and latency spikes by guaranteeing atomic write-read handoff via hardware BUSY arbitration at 55 ns timing precision. |
Use Scenario: High-speed sensor sampling in test equipment where analog-to-digital converters stream data to memory while a processor reads completed blocks. IC Role / Device Role / Timing Role: 7142SA55C provides isolated, non-blocking memory access - left port receives ADC data, right port feeds analysis engine. Use Value: Sustains 18.2 MB/s continuous throughput per port, matching high-resolution 16-bit ADCs sampling at >1 MSPS without DMA bottlenecks. |
| CPU-Peripheral Bridge Memory | Industrial Motion Controller Buffer |
|
Use Scenario: Interfacing a microcontroller with an FPGA-based motor controller, where both sides require concurrent access to shared command/status tables. IC Role / Device Role / Timing Role: 7142SA55C serves as SLAVE in a width-expanded 16-bit memory subsystem, synchronized to IDT7132SA master for deterministic arbitration. Use Value: Enables lock-free communication between heterogeneous processors using hardware-enforced BUSY signaling - no software semaphores required. |
Use Scenario: Storing trajectory profiles and real-time position feedback in servo drives operating in ambient temperatures from –40°C to +85°C. IC Role / Device Role / Timing Role: 7142SA55C stores motion parameters accessed simultaneously by motion ASIC (write) and safety monitor (read). Use Value: Industrial temp rating and 55 ns access ensure deterministic response in safety-critical closed-loop control loops under thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-55JC | 55 ns tRC, 2K × 8, but features bidirectional BUSY (input/output) and integrated arbitration; requires no master/slave pairing | Self-contained arbitration simplifies design but increases pin count and layout complexity vs. IDT7132/7142 split architecture | Select when minimizing external logic and avoiding master/slave routing constraints outweighs cost and board space trade-offs |
| IDT7132SA55C | Same speed grade and package, but functions as MASTER with BUSY output, on-chip arbitration, and expandable data width | Used as the controlling unit in width-expanded systems; cannot substitute directly for SLAVE role of 7142SA55C | Choose only when designing a new MASTER/SLAVE system - not a drop-in replacement, but essential companion in same architecture |
Compared with CY7C133-55JC and IDT7132SA55C, the 7142SA55C delivers optimized cost and layout efficiency in fixed MASTER/SLAVE width-expansion topologies, trading self-contained arbitration for lower gate count and simpler BUSY routing - ideal for volume industrial controllers where architecture is standardized.
Availability
7142SA55C is available at Aetrix Electronics and suitable for industrial motion control, real-time data acquisition, video frame buffering, and CPU-peripheral bridge memory applications requiring stable component supply and long-term obsolescence management.
Supply support for 7142SA55C 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 for communications, computing, and industrial markets.
The IDT7132/7142 family was designed specifically for deterministic, low-latency dual-port memory expansion in real-time embedded systems - prioritizing hardware arbitration, industrial reliability, and seamless 5V bus integration.
FAQ
What is the primary functional distinction between 7142SA55C and IDT7132SA55C?
The 7142SA55C is a SLAVE-only dual-port SRAM with BUSY inputs and no internal arbitration logic, requiring an external IDT7132SA55C master to manage port contention. In contrast, IDT7132SA55C contains on-chip arbitration, outputs BUSY signals, and can operate standalone or as the master in width-expanded systems - making them complementary, not interchangeable, components within the same architecture.
Does 7142SA55C support battery backup data retention?
No, the 7142SA55C does not support battery backup data retention. That feature is exclusive to LA-suffixed variants (e.g., 7142LA55C), which specify 2V data retention capability. The 'SA' suffix in 7142SA55C denotes standard active power consumption and excludes the low-voltage retention circuitry found in LA versions.
Can 7142SA55C be used without a master IDT7132 device?
Yes - the 7142SA55C functions as a fully independent dual-port SRAM without BUSY arbitration. When BUSYL and BUSYR are held high (e.g., pulled up to VCC), write operations proceed normally on both ports. BUSY logic is optional; its use is required only when deterministic conflict resolution is needed in shared-address scenarios.
What package types are available for 7142SA55C?
The 7142SA55C is offered in 48-pin PDG48 (plastic DIP), SB48 (side-braze DIP), LC48 (LCC), FP48 (flatpack), and 52-pin PLG52 (PLCC) packages. All share identical pinouts and electrical specifications; mechanical dimensions and mounting methods differ per package type to suit through-hole or surface-mount assembly requirements.
Is 7142SA55C compatible with 3.3V logic interfaces?
No - the 7142SA55C is strictly a 5V TTL-compatible device. Its input thresholds (VIH = 2.2V min, VIL = 0.8V max) and output drive levels (VOH = 2.4V min, VOL = 0.4V max at 4mA) are specified for 5V ±10% operation. Direct connection to 3.3V systems requires level-shifting circuitry to prevent overvoltage damage or logic misreads.
7142SA55C 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:
- 16Kbit
- Memory Organization:
- 2K 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 48-SIDE BRAZED
7142SA55C FAQ
1.How can I place an order for 7142SA55C through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA55C 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 7142SA55C reliable?
The price and inventory of 7142SA55C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA55C is usually 5 days.
3.What payment methods are accepted for 7142SA55C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA55C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA55C?
7142SA55C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA55C 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 7142SA55C?
For technical support, including 7142SA55C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA55C requirements.
6.How does Aetrix verify that 7142SA55C is sourced from the original manufacturer or authorized distributors?
All 7142SA55C 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 7142SA55C meets industry standards.
7.What is the process for return or replacement of 7142SA55C?
All 7142SA55C units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA55C, 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 7142SA55C part is unused and in its original packaging.
Return procedure for 7142SA55C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA55C 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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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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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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