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Renesas 7142SA35P
- Part No.:
- 7142SA35P
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7142SA35P.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 48DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,484
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Product details
Overview
7142SA35P from IDT is a high-speed 2K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion architectures, supporting 35 ns read/write cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory systems without external logic when paired with IDT7132SA/LA.
For engineers reviewing the 7142SA35P datasheet, 7142SA35P pinout, 7142SA35P application, or 7142SA35P equivalent, key selection considerations include BUSY input behavior for port arbitration, 48-pin PLCC package compatibility, low-power standby current (1.0 mA typical full-standby), and support for simultaneous asynchronous access across independent left/right ports.
Technical Context
The 7142SA35P implements fully independent dual-port architecture with separate address, control, and I/O buses per port - enabling true concurrent read/write operations to any memory location. Its BUSY pin functions exclusively as an input (unlike the MASTER IDT7132), used to inhibit writes during address contention.
It features automatic power-down via chip enable (CE) control, delivering ISB3 = 1.0 mA typical full-standby current at CMOS-level inputs. Fabricated in CMOS, it supports 35 ns tRC, tWC, tAA, and tACE timing with 5V ±10% supply and operates across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 bits (2048 words × 8 data lines); sufficient for real-time buffer, FIFO, or dual-CPU shared memory applications. |
| Access Time | 35 ns max (tAA, tACE, tAOE); enables integration into 28.6 MHz bus systems without wait states. |
| Supply Voltage | 5.0 V ±10% (4.5–5.5 V); compatible with legacy TTL and mixed-signal 5V system rails. |
| Standby Current | 1.0 mA typical (ISB3, both ports, CMOS inputs); enables low-power hold mode during processor sleep. |
| Operating Temp | –40°C to +85°C (industrial grade); qualified for embedded control, motor drives, and industrial PLCs. |
| Package | 48-pin PLCC (PLG52); surface-mountable with 0.050" lead pitch, suitable for automated assembly. |
| BUSY Function | Input-only (not output); asserts write-inhibit when driven LOW by MASTER IDT7132 during address collision. |
Pinout & Package
7142SA35P is packaged in a 48-pin Plastic Leaded Chip Carrier (PLCC, package code PLG52), measuring approximately 0.75" × 0.75" × 0.17", with gull-wing leads and internal heat slug. Pin 1 marked by index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Must be connected to system ground plane; two dedicated pins reduce ground bounce in high-speed dual-port operation. |
| VCC (Pin 25) | Power supply | 5V ±10% supply for core and I/O; requires local 0.1 µF ceramic decoupling adjacent to pin. |
| CEL / CER | Chip Enable (Left/Right) | Active-low enables respective port; controls power-down mode - CE = VIH places port in ISB1/ISB3 low-power state. |
| OEL / OER | Output Enable (Left/Right) | Active-low enables I/O drivers; allows high-impedance tri-state during bus sharing or arbitration cycles. |
| R/WL / R/WR | Read/Write Control (Left/Right) | High = read, Low = write; synchronous with CE and address setup; determines data direction on bidirectional I/O bus. |
| BUSYL / BUSYR | BUSY Input (Left/Right) | Active-low input only; when LOW, internally gates write strobes to prevent data corruption during port contention. |
| A0L–A10L / A0R–A10R | Address Inputs (Left/Right) | 11-bit address buses (2048 locations); must be stable before CE/R/W assertion per tAS and tAPS timing requirements. |
| I/O0L–I/O7L / I/O0R–I/O7R | Bidirectional Data I/O (Left/Right) | 8-bit parallel data path per port; driven only when OE = LOW and CE = LOW; high-Z otherwise. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration via BUSY input | Enables deterministic resolution of simultaneous accesses to same address - eliminates software polling or external logic in MASTER/SLAVE configurations. |
| 35 ns access with 5V supply | Supports real-time data exchange between independent processors or peripherals without pipeline stalls in industrial control loops. |
| Full-standby current ≤1.0 mA | Reduces system-level quiescent power in battery-backed or energy-sensitive applications where memory retention is required between active cycles. |
| Industrial temperature qualification | Validated operation from –40°C to +85°C ensures reliability in motor drives, factory automation, and outdoor embedded systems. |
| 48-pin PLCC packaging | Provides robust thermal and mechanical performance over DIP; compatible with standard reflow profiles and AOI inspection. |
Applications
| Real-Time Dual-CPU Communication | Industrial Motion Controller Buffer |
|---|---|
|
Use Scenario: Two independent microcontrollers exchange status, position, and command data via shared memory without software handshaking. IC Role / Device Role / Timing Role: SLAVE dual-port RAM providing non-blocking, low-latency interprocessor communication channel with hardware BUSY arbitration. Use Value: Eliminates CPU overhead from semaphores or polling; 35 ns access enables sub-µs data transfer latency between synchronized motion axes. |
Use Scenario: Servo drive firmware buffers encoder feedback and PWM update commands between FPGA-based timing engine and ARM application processor. IC Role / Device Role / Timing Role: Asynchronous buffer memory allowing independent read/write clocks - left port for FPGA, right port for ARM. Use Value: Prevents jitter in closed-loop timing; BUSY input ensures no command overwrite during encoder sampling window. |
| Redundant System State Sharing | Legacy Bus Interface Bridge |
|
Use Scenario: Primary and backup controllers maintain identical runtime state in mirrored memory for failover readiness in safety-critical PLCs. IC Role / Device Role / Timing Role: SLAVE device synchronized to MASTER IDT7132, ensuring atomic state updates across redundant channels. Use Value: Guarantees consistent state snapshot during switchover; 1.0 mA standby current extends backup battery life during idle periods. |
Use Scenario: Bridging ISA or VME bus peripherals to modern microcontroller subsystems requiring isolated, high-speed data staging. IC Role / Device Role / Timing Role: Dual-port interface acting as timing-isolated FIFO between legacy 8-bit bus and 32-bit host interface. Use Value: Absorbs burst transfers without DMA controller complexity; 48-pin PLCC simplifies adapter board layout and thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-35PC | 35 ns access, 2K × 8, but uses 28-pin DIP; no built-in BUSY arbitration logic - requires external glue logic for contention handling. | Best suited for simple point-to-point dual-port use cases without MASTER/SLAVE expansion needs. | Select when board space permits DIP footprint and system design avoids complex arbitration; not drop-in for 7142SA35P PLCC layouts. |
| IDT7132SA35P | Same speed grade and package, but MASTER device with BUSY output (open-drain), on-chip arbitration logic, and different pinout (BUSY pins are outputs). | Required as companion part in width-expanded systems; cannot substitute directly due to BUSY I/O direction mismatch and control logic differences. | Use only as MASTER in paired 7142SA35P SLAVE configurations - never as standalone replacement; verify pin mapping and arbitration timing constraints. |
Compared with CY7C133-35PC and IDT7132SA35P, the 7142SA35P uniquely delivers SLAVE-specific BUSY input behavior and seamless integration into IDT's MASTER/SLAVE expansion architecture - eliminating external arbitration logic while maintaining pin-compatible PLCC packaging and identical 35 ns timing.
Availability
7142SA35P is available at Aetrix Electronics and suitable for industrial motion control, real-time dual-CPU communication, and redundant system state sharing requiring stable component supply across extended product lifecycles.
Supply support for 7142SA35P 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-ported memory expansion in real-time embedded systems - emphasizing hardware arbitration, industrial temperature resilience, and seamless MASTER/SLAVE scalability.
FAQ
What is the function of BUSY pins on the 7142SA35P?
The BUSY pins (BUSYL and BUSYR) on the 7142SA35P serve exclusively as inputs - unlike the MASTER IDT7132, which drives them as open-drain outputs. When driven LOW by a MASTER device during address contention, they internally inhibit write operations on the corresponding port, preventing data corruption. This behavior is fixed and non-configurable in the 7142SA35P.
Can the 7142SA35P operate as a standalone dual-port RAM without a MASTER device?
Yes, the 7142SA35P can operate independently as a dual-port SRAM with full read/write capability on both ports. However, BUSY arbitration is disabled without an external BUSY signal source - meaning simultaneous writes to the same address will result in undefined data. For deterministic contention resolution, pairing with IDT7132SA35P is required.
What is the maximum clock frequency supported by the 7142SA35P?
The 7142SA35P does not use a clock; it is an asynchronous SRAM. Its timing is governed by cycle parameters: tRC = 35 ns (read cycle), tWC = 35 ns (write cycle), and tAA = 35 ns (address access). These correspond to a maximum effective bus rate of ~28.6 MHz when using minimum pulse widths and no wait states.
Is the 7142SA35P pin-compatible with other speed grades in the same family?
Yes - all IDT7142SA variants (e.g., 7142SA20P, 7142SA25P, 7142SA35P, 7142SA55P) share identical 48-pin PLCC pinouts and DC characteristics. Only AC timing parameters differ. This allows direct speed-grade substitution in existing designs without PCB revision, provided timing margins accommodate the slower variant.
Does the 7142SA35P support battery backup operation?
No - battery backup with 2V data retention is exclusive to LA-version parts (e.g., 7142LA35P). The 7142SA35P is the standard-power variant and requires continuous 4.5–5.5V supply for data retention; it draws 1.0 mA typical in full-standby mode but does not retain data below VCC = 4.5V.
7142SA35P 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:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 48-PDIP
7142SA35P FAQ
1.How can I place an order for 7142SA35P through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA35P 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 7142SA35P reliable?
The price and inventory of 7142SA35P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA35P is usually 5 days.
3.What payment methods are accepted for 7142SA35P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA35P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA35P?
7142SA35P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA35P 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 7142SA35P?
For technical support, including 7142SA35P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA35P requirements.
6.How does Aetrix verify that 7142SA35P is sourced from the original manufacturer or authorized distributors?
All 7142SA35P 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 7142SA35P meets industry standards.
7.What is the process for return or replacement of 7142SA35P?
All 7142SA35P units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA35P, 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 7142SA35P part is unused and in its original packaging.
Return procedure for 7142SA35P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA35P Tags
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