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Renesas 7142SA20J8
- Part No.:
- 7142SA20J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142SA20J8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
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Product details
Overview
IDT7142SA20J8 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 architectures. It features 20 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). The device supports independent asynchronous access on left/right ports and is used in real-time embedded systems requiring concurrent data access - such as digital signal processors interfacing with host controllers.
For engineers reviewing the IDT7142SA20J8 datasheet, IDT7142SA20J8 pinout, IDT7142SA20J8 application, or IDT7142SA20J8 equivalent, key selection considerations include BUSY input functionality (vs. master's BUSY output), 48-pin flatpack package compatibility, 2K × 8 memory depth, and support for CE-controlled write arbitration in width-expanded systems.
Technical Context
The IDT7142SA20J8 implements a fully independent dual-port architecture with separate address, control, and I/O buses per port, enabling true simultaneous read/write operations to distinct memory locations. Its BUSY pin functions strictly as an input - unlike the IDT7132 master - to gate writes during contention, with timing governed by tWB (0 ns min) and tWH (12 ns min).
It uses CMOS process technology to achieve 325 mW typical active power and 1 mA typical full-standby current (ISB3) under CMOS-level inputs. The device lacks on-chip arbitration logic and relies entirely on external master (e.g., IDT7132) for BUSY generation and priority resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit data width per port) |
| Max Read Cycle Time (tRC) | 20 ns - defines minimum interval between successive reads on same port |
| Supply Voltage | 5.0 V ±10% - requires single TTL-compatible rail; no dual-supply or level-shifting needed |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Active Current (ICC) | 110 mA typ. - determines thermal design margin and power supply sizing at max frequency |
| Full Standby Current (ISB3) | 1.0 mA typ. - enables low-power sleep mode when both CE pins held high with CMOS inputs |
| BUSY Function | Input-only - asserts internal write inhibit when driven low; no open-drain driver required |
Pinout & Package
Package: 48-pin flatpack (FP48), hermetically sealed, leadless ceramic, 0.75 in × 0.75 in × 0.11 in body size, suitable for high-reliability industrial and military applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for both ports; all GND pins must be connected to system ground plane |
| CER (Pin 2) | Right port chip enable | Active-low enable for right port address/control/I/O; deassertion places port in standby (ISB1/ISB2) |
| CEL (Pin 3) | Left port chip enable | Active-low enable for left port; independent of CER - enables asymmetric power management |
| OEL (Pin 4) | Left port output enable | Controls tri-state of left I/O[0:7]; high-Z when OEL = VIH, regardless of R/WL state |
| A0L–A10L (Pins 5,19–29) | Left port address inputs | 11-bit address bus selecting one of 2048 locations; latched on CE/R/W transitions |
| OER (Pin 30) | Right port output enable | Tri-states right I/O[0:7]; operates independently from OEL and R/WR |
| A0R–A10R (Pins 31,33–42) | Right port address inputs | 11-bit address bus for right port; fully asynchronous with left port addressing |
| I/O0L–I/O7L (Pins 6,13–18,32) | Left port bidirectional data | 8-bit data bus; direction controlled by R/WL; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R (Pins 43–48,7–12) | Right port bidirectional data | 8-bit data bus; direction controlled by R/WR; isolated electrically from left port I/O |
| BUSYL (Pin 15) | Left port BUSY input | Asynchronous write-inhibit signal; low level blocks write execution on left port regardless of R/WL/CEL state |
| BUSYR (Pin 24) | Right port BUSY input | Same function as BUSYL but for right port; enables independent contention handling per port |
| R/WL (Pin 16) | Left port read/write control | High = read (outputs enabled if OEL = VIH), low = write (inputs sampled); overrides OE for direction |
| R/WR (Pin 23) | Right port read/write control | Identical function to R/WL; no shared control - allows mixed read/write operations across ports |
| VCC (Pin 25) | Power supply | 5.0 V ±10% supply; all VCC pins must be decoupled locally with 0.1 µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent ports | Enables true concurrent access - e.g., DSP reads while microcontroller writes - eliminating software arbitration overhead |
| BUSY input architecture | Eliminates need for external logic to manage write contention; integrates seamlessly with IDT7132 master in 16-bit+ systems |
| 20 ns access speed | Supports real-time processing loops ≤50 MHz clock domains without wait states on either port |
| Industrial temperature rating | Validated operation from –40°C to +85°C ensures reliability in motor drives, PLCs, and outdoor communications equipment |
| Low-power standby modes | ISB3 = 1.0 mA typ. enables energy-efficient idle states in battery-backed or fanless embedded systems |
| 48-pin flatpack packaging | Hermetic ceramic construction provides moisture resistance and long-term stability in harsh environments |
Applications
| Real-Time Digital Signal Processing | Industrial Programmable Logic Controllers |
|---|---|
|
Use Scenario: A DSP core performs FFT computation while a microcontroller updates filter coefficients in shared memory. IC Role / Device Role / Timing Role: IDT7142SA20J8 serves as slave port in 16-bit-wide memory array, accepting coefficient writes from MCU while DSP reads streaming data - BUSY input prevents corruption during address collisions. Use Value: Enables deterministic latency for both processors without software locks or polling, sustaining 50 Mwords/s aggregate bandwidth. |
Use Scenario: PLC main CPU and I/O scan engine access shared tag database for status updates and command execution. IC Role / Device Role / Timing Role: IDT7142SA20J8 acts as slave in dual-processor memory subsystem, with CPU writing sensor thresholds and I/O engine reading actuator commands - BUSY input enforces atomic write sequencing. Use Value: Guarantees data coherency across control and monitoring threads without RTOS intervention or semaphore overhead. |
| Avionics Data Acquisition Systems | Military Radar Signal Buffers |
|
Use Scenario: Flight computer writes telemetry packets while ADC interface reads calibration tables from same memory space. IC Role / Device Role / Timing Role: IDT7142SA20J8 deployed as slave in master/slave pair with IDT7132; BUSY input halts telemetry writes during critical ADC read cycles to prevent metastability. Use Value: Meets DO-254 deterministic timing requirements with hardware-enforced arbitration, eliminating race conditions in safety-critical paths. |
Use Scenario: Radar front-end digitizes RF samples into ping buffers while back-end processor extracts target signatures from prior pings. IC Role / Device Role / Timing Role: IDT7142SA20J8 provides dedicated 2K×8 buffer per channel in width-expanded configuration; BUSY input synchronizes write bursts from ADC with read requests from DSP. Use Value: Sustains 20 ns read/write cycles across multiple channels without FIFO overflow or pipeline stalls in pulse-Doppler processing. |
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 CY7C1371D-200BAXI | 256K × 18 organization, 200 MHz QDR interface, 3.3 V supply, no native BUSY input | Targets high-bandwidth networking ASIC interfaces; requires external arbitration logic for contention management | Select when migrating to wider data paths and higher throughput; not drop-in due to voltage, bus width, and arbitration differences |
| Renesas R1EX24064ASAS0I | 64K × 8, I²C serial interface, 1.7–5.5 V supply, no dual-port concurrency | Designed for EEPROM replacement in low-pin-count microcontroller systems | Only viable for non-real-time, low-throughput storage where concurrent access is unnecessary |
Compared with CY7C1371D-200BAXI and R1EX24064ASAS0I, the IDT7142SA20J8 uniquely delivers hardware-managed contention resolution via BUSY input in a 2K × 8, 5V, 20 ns footprint - making it irreplaceable for legacy industrial and avionics designs requiring deterministic dual-port behavior without FPGA glue logic.
Availability
IDT7142SA20J8 is available at Aetrix Electronics and suitable for real-time digital signal processing, industrial programmable logic controllers, and avionics data acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for IDT7142SA20J8 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, and RF solutions before its acquisition by Renesas Electronics in 2019. IDT products are widely deployed in infrastructure and industrial systems.
The IDT7142SA20J8 belongs to IDT's legacy dual-port SRAM family, designed specifically for deterministic, contention-free memory sharing between heterogeneous processors in mission-critical embedded applications.
FAQ
What is the function of the BUSY pins on the IDT7142SA20J8?
The BUSYL and BUSYR pins on the IDT7142SA20J8 are dedicated inputs that internally inhibit write operations when driven low. Unlike the IDT7132 master, this device contains no BUSY generation logic. The signals must be supplied by an external master (e.g., IDT7132) to prevent simultaneous writes to the same address location - ensuring data integrity in width-expanded memory systems.
Can the IDT7142SA20J8 operate as a standalone dual-port RAM without a master device?
Yes, the IDT7142SA20J8 can operate as a standalone dual-port RAM, supporting independent read/write access on left and right ports. However, BUSY functionality is disabled without an external master driving the BUSY inputs. In standalone use, software or system-level arbitration must manage address contention - the device itself provides no hardware arbitration logic.
What package type is used for the IDT7142SA20J8, and is it RoHS-compliant?
The IDT7142SA20J8 is packaged in a 48-pin flatpack (FP48) - a hermetically sealed, leadless ceramic package measuring 0.75 in × 0.75 in × 0.11 in. Per IDT's ordering documentation, the "J8" suffix denotes the flatpack variant. While the original datasheet predates RoHS enforcement, IDT confirmed FP48 variants were manufactured with lead-free terminations and comply with RoHS Directive 2011/65/EU.
How does the IDT7142SA20J8 handle power-down modes, and what are the current draw values?
The IDT7142SA20J8 supports four power-down states controlled by CE and input voltage levels. With both CEL and CER high and all inputs at CMOS levels (VIH > VCC − 0.2 V or VIL < 0.2 V), ISB3 = 1.0 mA typical. With TTL-level inputs (VIH = 2.2 V), ISB1 = 30 mA typical. Full standby reduces dynamic noise and thermal load - critical for fanless industrial enclosures.
Is the IDT7142SA20J8 pin-compatible with other members of the IDT7132/7142 family?
Yes, the IDT7142SA20J8 shares identical pinout and package with all 48-pin FP48 variants in the IDT7132/7142 family, including IDT7132SA20J8 and IDT7142LA25J8. Differences lie only in speed grade (20 ns vs. 25 ns), power version (SA vs. LA), and temperature screening - allowing direct substitution where timing and power budgets permit.
7142SA20J8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- 20ns
- Access Time:
- 20 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)
7142SA20J8 FAQ
1.How can I place an order for 7142SA20J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA20J8 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 7142SA20J8 reliable?
The price and inventory of 7142SA20J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA20J8 is usually 5 days.
3.What payment methods are accepted for 7142SA20J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA20J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA20J8?
7142SA20J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA20J8 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 7142SA20J8?
For technical support, including 7142SA20J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA20J8 requirements.
6.How does Aetrix verify that 7142SA20J8 is sourced from the original manufacturer or authorized distributors?
All 7142SA20J8 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 7142SA20J8 meets industry standards.
7.What is the process for return or replacement of 7142SA20J8?
All 7142SA20J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA20J8, 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 7142SA20J8 part is unused and in its original packaging.
Return procedure for 7142SA20J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA20J8 Tags
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