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Renesas 7142LA35L48B
- Part No.:
- 7142LA35L48B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-LCC
- Datasheet:
-
7142LA35L48B.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 48LCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,030
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Product details
Overview
7142LA35L48B from IDT is a 2K × 8 dual-port static RAM configured as a slave device in master/slave memory expansion systems, supporting independent asynchronous read/write access on left and right ports with 35 ns maximum read cycle time, 1 mA typical standby current (LA version), and battery-backed data retention at 2 V. It is used in real-time digital signal processing systems requiring concurrent CPU and DMA access to shared memory buffers.
For engineers reviewing the 7142LA35L48B datasheet, 7142LA35L48B pinout, 7142LA35L48B application, or 7142LA35L48B equivalent, key selection criteria include BUSY input functionality for port arbitration, 48-pin flatpack package compatibility, industrial temperature range (–40°C to +85°C), and TTL-compatible 5 V ±10% operation without external level translation.
Technical Context
The 7142LA35L48B operates exclusively as a slave unit: its BUSYL and BUSYR pins are dedicated inputs that gate write operations when asserted low by a master IDT7132, preventing simultaneous writes to identical addresses. It lacks on-chip arbitration logic - all BUSY-driven contention resolution is externally coordinated via the master device.
It supports two independent 11-bit address buses (A0L–A10L and A0R–A10R), separate chip enable (CEL/CER), output enable (OEL/OER), and read/write (R/WL/R/WR) controls per port, enabling full-speed concurrent access without software coordination. The LA variant guarantees 2 V data retention during power loss, drawing ≤100 µA in retention mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), dual-port architecture with fully independent left/right address/data/control paths |
| Access Time (tRC) | 35 ns max - defines minimum read cycle duration; enables interface with 28.6 MHz synchronous logic without wait states |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low power consumption when both ports disabled with CMOS-level inputs, critical for battery-backed systems |
| Data Retention Voltage | 2.0 V min - maintains stored data during main supply dropout; requires no external backup battery circuitry beyond 2 V source |
| Operating Voltage | 4.5–5.5 V - TTL-compatible single-supply operation; eliminates need for voltage translators in legacy 5 V bus systems |
| Temperature Range | –40°C to +85°C - qualified for industrial environments including motor control, factory automation, and telecom line cards |
| Package | 48-lead flatpack (FP48) - hermetically sealed, leadless ceramic package with 0.75″ × 0.75″ footprint and 0.11″ height for high-reliability PCB mounting |
Pinout & Package
48-pin flatpack (FP48) package with 0.050″ lead pitch; body dimensions 0.75″ × 0.75″ × 0.11″; hermetic ceramic construction rated for industrial and military applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Two dedicated ground pins minimize ground bounce during simultaneous port switching; must be connected to system ground plane |
| VCC (Pin 25) | Power supply | Single 5 V ±10% supply; all VCC pins must be decoupled locally with 0.1 µF ceramic capacitor |
| BUSYL / BUSYR (Pins 12, 36) | Arbitration input | Active-low BUSY signals from master IDT7132; internally inhibit writes when low - no pull-up required on slave side |
| CEL / CER (Pins 3, 5) | Chip enable | Asynchronous port select: CE = low enables port; CE = high places port in low-power standby (ISB1/ISB2) |
| OEL / OER (Pins 4, 6) | Output enable | Controls I/O drivers: OE = low enables outputs; OE = high forces I/O pins into high-impedance state |
| R/WL / R/WR (Pins 11, 37) | Read/write direction | R/W = high → read; R/W = low → write; determines data flow direction on I/O lines during active cycles |
| A0L–A10L / A0R–A10R (Pins 13–23, 38–48) | Address inputs | 11-bit address buses per port; fully decoded internally - no external address latches needed |
| I/O0L–I/O7L / I/O0R–I/O7R (Pins 7–10, 26–29, 30–35) | Data I/O | Bidirectional 8-bit data buses; high-impedance when CE or OE inactive; compatible with TTL logic levels |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY interface | Eliminates need for external arbitration logic in width-expanded memory systems - BUSY inputs directly gate internal write paths |
| 2 V data retention | Preserves memory contents during brownout or controlled shutdown without external backup circuitry; validated at 25°C |
| Independent port power control | Each port enters standby independently via CE; enables asymmetric power management (e.g., CPU port active, DMA port in ISB4) |
| TTL-compatible signaling | Direct interface with 5 V microcontrollers, FPGAs, and ASICs without level shifters; VIH = 2.2 V min, VIL = 0.8 V max |
| Hermetic FP48 packaging | Sealed ceramic flatpack ensures long-term reliability in high-humidity, high-vibration, or extended-temperature industrial deployments |
Applications
| Digital Signal Processing Buffer | Real-Time Industrial Controller |
|---|---|
Use Scenario: Concurrent access to shared coefficient/data tables by DSP core and host processor in radar beamforming subsystems. IC Role / Device Role / Timing Role: Slave dual-port RAM providing non-blocking memory access; BUSY inputs prevent write collisions during simultaneous address matches. Use Value: Enables deterministic latency for both processors - no software arbitration overhead; 35 ns access sustains >28 MHz data throughput per port. | Use Scenario: Shared memory between PLC CPU and fieldbus communication coprocessor in modular I/O chassis. IC Role / Device Role / Timing Role: Slave memory node synchronized to master IDT7132; retains configuration data during 2 V backup power during mains failure. Use Value: Guarantees zero-data-loss state preservation across power transitions; industrial temp rating ensures stable operation in cabinet environments up to 85°C. |
| Avionics Data Acquisition | Medical Imaging Frame Store |
Use Scenario: High-integrity sensor fusion buffer where flight computer and safety monitor access telemetry simultaneously. IC Role / Device Role / Timing Role: Slave unit in redundant master/slave pair; FP48 package meets DO-254 mechanical reliability requirements. Use Value: Hermetic sealing prevents moisture-induced failures; 2 V retention preserves last-valid sensor snapshot during emergency power loss. | Use Scenario: Dual-port frame buffer allowing continuous image acquisition (via FPGA) while host PC reads prior frames. IC Role / Device Role / Timing Role: Slave RAM interfaced to master for 16-bit+ word width expansion; BUSY-controlled write inhibition prevents corrupted pixel writes. Use Value: Eliminates frame tearing or dropped acquisitions; 35 ns access enables real-time 1080p@60Hz streaming with 8-bit pixel depth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-35JC | 35 ns access, 2K × 8, but uses 3-state BUSY outputs (not inputs); requires external pull-ups and different arbitration wiring | Designed for standalone use or daisy-chained arbitration; not drop-in compatible with IDT7132/7142 master/slave topology | Select only if redesigning arbitration logic; incompatible with existing IDT7132-based master boards |
| AS7C3256B-35JIN | 35 ns, 32K × 8, single-port architecture; no BUSY logic or dual-port concurrency | Requires external dual-port controller (e.g., FPGA) for concurrent access; no native hardware arbitration | Choose only for cost-sensitive, lower-density applications where FPGA-based arbitration is acceptable |
Compared with CY7C133-35JC and AS7C3256B-35JIN, the 7142LA35L48B delivers native slave-mode BUSY input behavior and seamless integration into IDT's master/slave expansion architecture - eliminating external logic and ensuring deterministic contention resolution without firmware intervention.
Availability
7142LA35L48B is available at Aetrix Electronics and suitable for digital signal processing buffers, real-time industrial controllers, and avionics data acquisition systems requiring stable component supply, long-term obsolescence management, and guaranteed industrial temperature performance.
Supply support for 7142LA35L48B 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 timing, memory interface, RF, and sensor signal conditioning ICs, now part of Renesas Electronics.
The IDT7142 product line delivers high-speed dual-port SRAMs optimized for real-time embedded systems requiring deterministic concurrent memory access, with LA variants emphasizing ultra-low-power retention for mission-critical backup operation.
FAQ
What is the function of BUSYL and BUSYR on the 7142LA35L48B?
BUSYL and BUSYR are dedicated input pins on the 7142LA35L48B that receive active-low BUSY signals from a master IDT7132 device. When either pin is driven low, the corresponding port's write operations are internally inhibited - this is the core mechanism for hardware-based arbitration in master/slave memory expansion configurations.
Can the 7142LA35L48B operate as a standalone dual-port RAM without a master device?
No - the 7142LA35L48B is designed exclusively as a slave device. It lacks on-chip arbitration logic and relies on external BUSY inputs from an IDT7132 master to resolve port contention. Using it without a master risks undetected write collisions and data corruption during simultaneous address access.
Does the 7142LA35L48B require external pull-up resistors on BUSYL/BUSYR?
No. Unlike the open-drain BUSY outputs on the IDT7132 master, the 7142LA35L48B's BUSYL and BUSYR pins are CMOS inputs. They accept standard TTL logic levels and do not require external pull-up resistors - those are only needed on the master's BUSY outputs (270 Ω recommended).
What is the significance of the 'LA' suffix in 7142LA35L48B?
The 'LA' denotes the low-power, battery-backed variant of the IDT7142. It features 1 mA typical standby current (vs. 5 mA for SA versions) and guaranteed data retention at 2.0 V supply - enabling reliable memory holdover during main power interruption without external backup circuitry.
Is the 7142LA35L48B pin-compatible with other IDT7142 speed grades in the same FP48 package?
Yes - all IDT7142 variants (e.g., 7142LA25L48B, 7142LA55L48B) share identical FP48 pinouts and electrical interfaces. Speed grade differences affect only timing parameters (tRC, tAA, etc.) and do not alter pin function, voltage thresholds, or DC characteristics - enabling drop-in replacement for timing-margin tuning.
7142LA35L48B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-LCC
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LCC (14.22x14.22)
7142LA35L48B FAQ
1.How can I place an order for 7142LA35L48B through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA35L48B 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 7142LA35L48B reliable?
The price and inventory of 7142LA35L48B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA35L48B is usually 5 days.
3.What payment methods are accepted for 7142LA35L48B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA35L48B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA35L48B?
7142LA35L48B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA35L48B 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 7142LA35L48B?
For technical support, including 7142LA35L48B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA35L48B requirements.
6.How does Aetrix verify that 7142LA35L48B is sourced from the original manufacturer or authorized distributors?
All 7142LA35L48B 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 7142LA35L48B meets industry standards.
7.What is the process for return or replacement of 7142LA35L48B?
All 7142LA35L48B units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA35L48B, 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 7142LA35L48B part is unused and in its original packaging.
Return procedure for 7142LA35L48B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142LA35L48B Tags
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