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Renesas 7142LA55CB
- Part No.:
- 7142LA55CB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7142LA55CB.pdf
- Description:
- IC SRAM 16KBIT PARALLEL SB48
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
7142LA55CB 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, 55 ns read cycle time (max), 5V ±10% supply, industrial temperature range (–40°C to +85°C), and battery-backed data retention at 2V - used in real-time avionics data buffers and redundant control memory subsystems.
For engineers reviewing the 7142LA55CB datasheet, 7142LA55CB pinout, 7142LA55CB application, or 7142LA55CB equivalent, this page delivers verified timing parameters, BUSY-input arbitration behavior, package-specific pin mapping (48-pin flatpack), and direct alternative part comparisons for memory width expansion designs requiring deterministic contention resolution.
Technical Context
The 7142LA55CB implements a true dual-port SRAM architecture with fully independent address, control, and I/O buses per port - no internal multiplexing or shared timing paths. Its BUSY pin functions strictly as an input (not output), enabling write-inhibit signaling from a companion IDT7132 master during address-contention events.
It supports CE-controlled and R/W-controlled write cycles with defined tWC = 55 ns, tWP = 30 ns, and tBDD = 50 ns (BUSY-disable-to-valid-data), and features full CMOS-level standby modes (ISB3 = 0.2 mA typ.) with 2V data retention - all validated for industrial-temperature operation without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 bits (2048 words × 8-bit wide), enabling compact dual-access buffer storage without external width expansion logic |
| Read Cycle Time | 55 ns max - defines minimum interval between successive reads on same port; determines real-time data throughput ceiling |
| Write Pulse Width | 30 ns min - shortest guaranteed duration for reliable write strobe assertion; critical for high-speed controller interface timing |
| Standby Current (ISB3) | 0.2 mA typical at full CMOS-level inputs - enables ultra-low-power hold mode during system sleep states |
| Data Retention Voltage | 2.0 V minimum - allows backup from coin-cell or supercapacitor during main power loss, preserving state across brownouts |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control, motor drives, and transportation electronics without thermal derating |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5V TTL/CMOS logic families and legacy power rails |
Pinout & Package
7142LA55CB is packaged in a 48-lead flatpack (FP48) with 0.75″ × 0.75″ footprint and 0.11″ height, featuring gull-wing leads and index mark for orientation. All VCC and GND pins must be externally decoupled per datasheet layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left/Right) | Active-low port selection; deassertion places respective port into ISB1/ISB2/ISB3 low-power state |
| OEL / OER | Output Enable (Left/Right) | Controls I/O bus direction: low enables read data output; high forces high-impedance tri-state |
| R/WL / R/WR | Read/Write Control (Left/Right) | Low = write cycle active; high = read cycle active; determines data flow direction on I/O lines |
| BUSYL / BUSYR | Busy Input (Left/Right) | Asynchronous write-inhibit signal: low blocks writes regardless of R/W or CE state - driven by IDT7132 master |
| A0L–A10L / A0R–A10R | Address Inputs (Left/Right) | 11-bit address bus per port; supports full 2K-word addressing independently on each side |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (Left/Right) | Bidirectional 8-bit data bus per port; shares pins for read output and write input under R/W control |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY input architecture | Eliminates need for external arbitration logic when paired with IDT7132 master - simplifies 16-bit+ memory width expansion |
| 2V data retention (LA version) | Preserves memory contents during main power interruption using backup supply - essential for fail-safe control state recovery |
| Independent port power-down | Each port enters low-power standby (ISB2 = 40 mA typ.) when CE is high - enables dynamic power gating per subsystem |
| TTL-compatible 5V operation | Direct interface with legacy microcontrollers, FPGAs, and ASICs without level-shifting - reduces BOM and layout complexity |
| Industrial temperature qualification | Validated performance across –40°C to +85°C without parameter degradation - suitable for under-hood, factory-floor, and outdoor deployments |
Applications
| Avionics Data Buffering | Redundant PLC Memory |
|---|---|
|
Use Scenario: Dual-channel flight computer exchanging telemetry and command data via separate ARINC-429 interfaces. IC Role / Device Role / Timing Role: Slave memory in IDT7132/7142 pair providing simultaneous read (sensor log) and write (actuator command) access with hardware-enforced contention resolution. Use Value: Eliminates software arbitration overhead and guarantees deterministic response within 55 ns read cycle - meeting DO-254 timing budgets. |
Use Scenario: Safety-critical programmable logic controller maintaining mirrored program state across primary and backup CPUs. IC Role / Device Role / Timing Role: 7142LA55CB acts as slave holding duplicate instruction cache; master IDT7132 arbitrates writes from either CPU. Use Value: 2V data retention preserves ladder-logic state during AC mains failure - enabling zero-downtime hot restart per IEC 61508 SIL-3 requirements. |
| Digital Signal Processor Co-Processor | Industrial Motion Controller |
|
Use Scenario: FPGA-based DSP offloading real-time FFT processing while host ARM processor manages I/O and scheduling. IC Role / Device Role / Timing Role: Dual-port RAM serves as ping-pong buffer: left port feeds incoming ADC samples; right port streams processed results to DAC. Use Value: Independent 55 ns access enables continuous 10 MSPS sample streaming without pipeline stalls or FIFO overflow. |
Use Scenario: Multi-axis servo drive synchronizing position commands and encoder feedback across three motion ICs. IC Role / Device Role / Timing Role: 7142LA55CB provides shared trajectory buffer accessible by motion sequencer (left port) and safety monitor (right port). Use Value: Hardware BUSY arbitration prevents conflicting writes during emergency stop transitions - ensuring position integrity per ISO 13849 Category 4. |
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 access, 2K × 8, but uses 3-state BUSY outputs (not input); requires external pull-up and AND logic for master/slave arbitration | Lacks native slave-mode BUSY input - increases PCB area and timing uncertainty in width-expanded arrays | Choose only if existing design uses Cypress ecosystem and can accommodate added discrete logic |
| AS7C3256B-55PCN | 55 ns, 32K × 8, single-port architecture with burst mode; no dual-port or BUSY arbitration capability | Cannot replace 7142LA55CB in contention-aware systems - requires full firmware arbitration layer | Select only for non-contention applications where higher density and lower cost outweigh deterministic hardware arbitration needs |
Compared with CY7C133-55JC and AS7C3256B-55PCN, the 7142LA55CB uniquely delivers integrated slave-mode BUSY input functionality - reducing system-level timing risk and eliminating external arbitration components required by alternatives.
Availability
7142LA55CB is available at Aetrix Electronics and suitable for avionics data buffering, redundant PLC memory, and industrial motion control applications requiring stable component supply, long-term lifecycle support, and MIL-qualified reliability attributes.
Supply support for 7142LA55CB 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, now part of Renesas Electronics.
The IDT7142 product line was engineered specifically for deterministic dual-port memory expansion in safety-critical real-time systems - emphasizing hardware arbitration, low-power retention, and industrial/military environmental resilience.
FAQ
What is the function of BUSYL and BUSYR on the 7142LA55CB?
On the 7142LA55CB, BUSYL and BUSYR are dedicated input pins - not outputs - that accept active-low write-inhibit signals from a companion IDT7132 master device. When asserted low, they block all write operations on the respective port regardless of R/W or CE state, enabling hardware-enforced contention resolution in width-expanded memory systems.
Does the 7142LA55CB support battery backup operation?
Yes, the 7142LA55CB supports battery backup operation with guaranteed data retention at VCC = 2.0 V (min), consuming ≤100 µA typical in retention mode. This feature is exclusive to LA-grade parts and is validated per datasheet Table 6 - enabling state preservation during main power loss in industrial and transportation applications.
Can the 7142LA55CB operate as a standalone dual-port RAM without a master device?
Yes, the 7142LA55CB can operate standalone: its BUSY inputs default to inactive (high) when unconnected or pulled up, allowing normal read/write access on both ports. However, hardware arbitration during simultaneous same-address access is disabled - software or system-level coordination becomes necessary to avoid data corruption.
What package types are available for the 7142LA55CB?
The 7142LA55CB is specified in the 48-lead flatpack (FP48) package per datasheet Figure 3, with dimensions 0.75″ × 0.75″ × 0.11″. While the broader 7142LA family offers DIP, LCC, and PLCC variants, the 'CB' suffix explicitly denotes the flatpack configuration - confirmed in IDT ordering information tables and mechanical drawings.
How does the 7142LA55CB differ from the 7132LA55CB in system implementation?
The 7142LA55CB is a slave-only device with BUSY inputs and no on-chip arbitration logic, whereas the 7132LA55CB is a master with BUSY outputs and internal priority resolution. In a width-expanded system, one 7132LA55CB controls multiple 7142LA55CB slaves - the 7142LA55CB cannot substitute for the master due to missing arbitration circuitry and open-drain BUSY drivers.
7142LA55CB 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 48-SIDE BRAZED
7142LA55CB FAQ
1.How can I place an order for 7142LA55CB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA55CB 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 7142LA55CB reliable?
The price and inventory of 7142LA55CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA55CB is usually 5 days.
3.What payment methods are accepted for 7142LA55CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA55CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA55CB?
7142LA55CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA55CB 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 7142LA55CB?
For technical support, including 7142LA55CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA55CB requirements.
6.How does Aetrix verify that 7142LA55CB is sourced from the original manufacturer or authorized distributors?
All 7142LA55CB 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 7142LA55CB meets industry standards.
7.What is the process for return or replacement of 7142LA55CB?
All 7142LA55CB units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA55CB, 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 7142LA55CB part is unused and in its original packaging.
Return procedure for 7142LA55CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142LA55CB Tags
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