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Renesas 7142SA55J
- Part No.:
- 7142SA55J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142SA55J.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,426
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Product details
Overview
IDT7142SA55J from Integrated Device Technology (IDT) is a high-speed 2K × 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 BUSY input functionality for port arbitration - enabling error-free 16-bit-or-wider memory systems without external logic. Used in real-time digital signal processing buffers and military-grade avionics data exchange subsystems.
For engineers reviewing the IDT7142SA55J datasheet, IDT7142SA55J pinout, IDT7142SA55J application, or IDT7142SA55J equivalent, key selection criteria include BUSY-input arbitration timing (tWB = 0 ns), industrial temperature range (–40°C to +85°C), 48-pin flatpack package compatibility, and verified drop-in replacement behavior with IDT7142SA55L in SA-series systems.
Technical Context
The IDT7142SA55J implements fully independent left/right ports with separate address (A0–A10), control (CEL/CER, OEL/OER, R/WL/R/WR), and bidirectional I/O (I/O0–I/O7) lines. Its BUSY pin functions strictly as an input - unlike the MASTER IDT7132 - and internally inhibits writes when asserted low, enforcing hardware-based contention resolution.
It operates exclusively in SLAVE mode: no on-chip arbitration logic, no BUSY output generation, and no automatic priority arbitration. Timing parameters are synchronized to the MASTER's BUSY signal, with tWDD (write pulse to data delay) up to 60 ns and tDDD (write data valid to read data delay) up to 35 ns at 55 ns speed grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 (2048 words × 8 bits); supports independent concurrent access per port |
| Access Time | 55 ns max read/write cycle (tRC/tWC); enables synchronization with 18.2 MHz bus clocks |
| Supply Voltage | 5.0 V ±10%; compatible with legacy TTL logic families without level-shifting |
| Operating Temp | –40°C to +85°C (industrial grade); qualified for embedded control and avionics environments |
| Standby Current | ISB3 = 1.0 mA typ. (full CMOS standby); enables low-power hold during processor idle states |
| BUSY Function | Input-only (not open-drain); asserts write inhibit when low - requires MASTER IDT7132 coordination |
| Package | 48-pin flatpack (FP48); hermetically sealed, MIL-PRF-38535 QML-compliant for high-reliability use |
Pinout & Package
Package: 48-pin flatpack (FP48), body dimensions ≈ 0.75 in × 0.75 in × 0.11 in, hermetic ceramic construction compliant with MIL-PRF-38535 QML Class V.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Two dedicated ground pins ensure stable reference for both ports; must be connected to system ground plane |
| VCC (Pin 25) | Power supply | Single 5V supply powers entire device; all VCC pins must be decoupled locally with 0.1 µF ceramic capacitor |
| CEL / CER (Pins 3, 4) | Chip enable (left/right) | Active-low enables respective port; CE = VIH places port in low-power standby (ISB1/ISB3) |
| OEL / OER (Pins 5, 48) | Output enable (left/right) | Active-low controls I/O drivers; OE = VIH forces I/O pins into high-impedance state |
| R/WL / R/WR (Pins 6, 47) | Read/write control (left/right) | Active-low initiates write; high enables read - determines direction of data flow on I/O bus |
| BUSYL / BUSYR (Pins 12, 37) | BUSY input (left/right) | SLAVE-only input; low disables writes to corresponding port - driven by MASTER IDT7132 BUSY outputs |
| A0L–A10L / A0R–A10R (Pins 7–11, 38–42, 44–46) | Address inputs (left/right) | 11-bit address buses select one of 2048 locations independently per port |
| I/O0L–I/O7L / I/O0R–I/O7R (Pins 13–20, 29–36) | Data I/O (left/right) | Bidirectional 8-bit data paths; tri-stated when OE = VIH or CE = VIH |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only architecture | Eliminates need for external arbitration logic when paired with IDT7132 MASTER - reduces BOM count and layout complexity |
| BUSY-input write inhibition | Hardware-enforced write blocking prevents data corruption during simultaneous same-address access - no software intervention required |
| 55 ns speed grade | Supports real-time DSP buffering and radar pulse processing where sub-60 ns memory latency is mandatory |
| MIL-PRF-38535 QML Class V | Qualified for flight-critical avionics and defense electronics with full traceability, screening, and burn-in |
| Industrial temperature range | Validated operation from –40°C to +85°C ensures reliability in engine control units and outdoor base stations |
| TTL-compatible interface | Direct connection to legacy 5V microcontrollers and FPGAs without voltage translation or level shifters |
Applications
| Real-Time Radar Signal Buffering | Digital Avionics Data Exchange |
|---|---|
|
Use Scenario: Storing and synchronizing pulse-Doppler radar return samples between ADC capture (Port A) and FFT processing engine (Port B). IC Role / Device Role / Timing Role: SLAVE IDT7142SA55J receives BUSY signal from MASTER IDT7132 to prevent write collisions during concurrent read/write to same memory location. Use Value: Guarantees deterministic 55 ns memory access with zero data loss under worst-case timing skew - critical for coherent integration windows. |
Use Scenario: Dual-processor communication buffer in fly-by-wire flight control computers, where safety-critical CPU and monitoring CPU share telemetry data. IC Role / Device Role / Timing Role: SLAVE IDT7142SA55J provides isolated, atomic read/write access to shared memory space with hardware arbitration via BUSY input. Use Value: Enables lock-free inter-processor communication without software semaphores - reducing interrupt latency and certification burden. |
| Industrial Motion Controller FIFO | Military ECM Memory Expansion |
|
Use Scenario: High-speed servo command queue in CNC machine controllers, accepting motion profiles from host PC (Port A) and feeding interpolated steps to motor driver (Port B). IC Role / Device Role / Timing Role: SLAVE IDT7142SA55J expands data bus width in tandem with IDT7132 MASTER to achieve 16-bit parallel throughput. Use Value: Delivers sustained 18.2 MB/s bandwidth with no wait states - meeting nanosecond-jitter requirements for closed-loop position control. |
Use Scenario: Wide-word memory subsystem in electronic countermeasure (ECM) jammers requiring rapid waveform loading and real-time modification. IC Role / Device Role / Timing Role: SLAVE IDT7142SA55J deployed in multi-chip MASTER/SLAVE arrays using FP48 packages for thermal and EMI resilience in airborne enclosures. Use Value: MIL-PRF-38535 qualification ensures operation under shock, vibration, and extended temperature cycling - validated for 20,000+ flight hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7142SA55L | Same 55 ns speed, identical pinout and timing; differs only in lead finish (Pb-free vs. SnPb) and packaging (PLCC vs. flatpack) | PLCC package offers easier rework but lower thermal performance than hermetic flatpack | Select IDT7142SA55L only if RoHS compliance and surface-mount rework capability outweigh MIL-spec reliability requirements |
| CY7C133-55JC | 55 ns, 2K × 8 dual-port SRAM; no built-in BUSY arbitration - requires external logic for contention management | Lacks native MASTER/SLAVE BUSY protocol; increases design complexity and board area for equivalent functionality | Choose CY7C133-55JC only when leveraging Cypress' broader support ecosystem and existing design reuse - not for new MIL/avionics designs |
Compared with IDT7142SA55L, the IDT7142SA55J offers superior thermal stability and radiation tolerance due to its flatpack hermetic seal and MIL-PRF-38535 qualification; compared with CY7C133-55JC, it eliminates external arbitration logic, reducing component count and timing uncertainty in safety-critical systems.
Availability
IDT7142SA55J is available at Aetrix Electronics and suitable for real-time radar signal buffering, digital avionics data exchange, and industrial motion controller FIFO applications requiring stable component supply across extended product lifecycles.
Supply support for IDT7142SA55J 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) is a fabless semiconductor company specializing in high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.
IDT7142SA55J belongs to the IDT7132/7142 dual-port SRAM family, designed specifically for deterministic, contention-free memory sharing between asynchronous processors or data paths in mission-critical systems.
FAQ
Is IDT7142SA55J pin-compatible with IDT7132SA55J?
No. IDT7142SA55J and IDT7132SA55J share identical pinouts and package footprints, but their BUSY pin functions differ fundamentally: IDT7142SA55J has BUSY as input only, while IDT7132SA55J has BUSY as open-drain output. Swapping them without redesigning BUSY routing will cause functional failure. The IDT7142SA55J must be used exclusively as SLAVE alongside IDT7132SA55J as MASTER.
What is the minimum pull-up resistor value required for BUSY signals driving IDT7142SA55J?
IDT7142SA55J does not require a pull-up resistor on its BUSY pins because they are inputs, not open-drain outputs. Pull-up resistors (270 Ω) are required only on the BUSY outputs of the MASTER IDT7132SA55J to drive the BUSY inputs of IDT7142SA55J. The IDT7142SA55J BUSY inputs accept standard TTL logic levels and draw negligible current.
Does IDT7142SA55J support battery backup data retention?
No. Battery backup data retention (down to 2V) is exclusive to LA-version parts like IDT7142LA55J. The IDT7142SA55J is an SA-version device with standard 5V-only operation and no low-voltage retention capability. Its standby current is 1.0 mA typical in full CMOS standby mode, but it loses data below VCC = 4.5 V.
Can IDT7142SA55J operate in standalone mode without a MASTER device?
Yes, IDT7142SA55J can operate as a standalone dual-port SRAM with both ports fully functional for independent reads/writes. However, BUSY arbitration is disabled - meaning simultaneous same-address access from both ports may result in undefined or corrupted data. For deterministic operation under contention, pairing with IDT7132SA55J MASTER is mandatory.
What is the maximum operating frequency supported by IDT7142SA55J?
IDT7142SA55J supports a maximum read/write cycle time of 55 ns, corresponding to a theoretical maximum clock rate of 18.2 MHz for continuous sequential access. Actual system-level throughput depends on address setup/hold times, CE/OE assertion timing, and bus turnaround overhead - but the device guarantees correct operation at tRC = 55 ns across its full industrial temperature range.
7142SA55J 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7142SA55J FAQ
1.How can I place an order for 7142SA55J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA55J 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 7142SA55J reliable?
The price and inventory of 7142SA55J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA55J is usually 5 days.
3.What payment methods are accepted for 7142SA55J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA55J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA55J?
7142SA55J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA55J 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 7142SA55J?
For technical support, including 7142SA55J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA55J requirements.
6.How does Aetrix verify that 7142SA55J is sourced from the original manufacturer or authorized distributors?
All 7142SA55J 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 7142SA55J meets industry standards.
7.What is the process for return or replacement of 7142SA55J?
All 7142SA55J units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA55J, 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 7142SA55J part is unused and in its original packaging.
Return procedure for 7142SA55J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA55J 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
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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
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