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Renesas 7142SA55L48B
- Part No.:
- 7142SA55L48B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-LCC
- Datasheet:
-
7142SA55L48B.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 48LCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
7142SA55L48B 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 55 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It serves as the data-width-expansion companion to IDT7132SA/LA in 16-bit-or-wider memory subsystems for real-time embedded controllers.
For engineers reviewing the 7142SA55L48B datasheet, 7142SA55L48B pinout, 7142SA55L48B application, or 7142SA55L48B equivalent, key selection considerations include BUSY input functionality (not output), absence of on-chip arbitration logic, compatibility with IDT7132SA/LA master devices, and flatpack (FP48) package constraints for high-reliability industrial PCB layouts.
Technical Context
The 7142SA55L48B implements two fully independent address/data/control interfaces - left port (A0L–A10L, I/O0L–I/O7L, CEL/OEL/R/WL, BUSYL) and right port (A0R–A10R, I/O0R–I/O7R, CER/OER/R/WR, BUSYR) - enabling concurrent access without software coordination. Its BUSY pins function strictly as inputs, requiring external assertion from a master IDT7132 to inhibit writes during address contention.
It lacks internal port arbitration logic and relies entirely on external BUSY signaling for conflict resolution. The device supports automatic power-down via CE-driven standby modes (ISB1–ISB4), with typical full-standby current of 0.2 mA (LA) or 1.0 mA (SA) at CMOS-level inputs, and operates exclusively at 5V ±10% with TTL voltage thresholds (VIH = 2.2 V, VIL = 0.8 V).
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) | 55 ns - defines minimum interval between successive reads on same port |
| Supply Voltage | 5.0 V ±10% - requires single-rail 4.5–5.5 V supply; no dual-voltage support |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability, not commercial or military grade |
| Standby Current (ISB3) | 0.2 mA (typ.) - achieved when both CE pins > VCC – 0.2 V and all inputs at CMOS levels |
| BUSY Function | Input-only - asserts write-inhibit internally when driven LOW; no open-drain driver |
| Package | 48-pin flatpack (FP48) - hermetically sealed, 0.75″ × 0.75″ × 0.11″ body, leadless ceramic |
Pinout & Package
7142SA55L48B is supplied in a 48-pin flatpack (FP48) package: hermetic ceramic, side-brazed leads, 0.75″ × 0.75″ footprint, 0.11″ height, with index mark at Pin 1. All VCC pins must be connected to 5V supply; all GND pins to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Common return path for both ports; must be low-impedance connection |
| VCC (Pin 25) | Power supply | Single 5V ±10% supply for entire device; decoupling required near pin |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; drives ISB1/ISB2 standby modes when HIGH |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; HIGH places I/O pins in high-Z state |
| R/WL / R/WR | Read/write control (left/right) | LOW = write, HIGH = read; determines direction of data flow on I/O bus |
| BUSYL / BUSYR | BUSY input (left/right) | Asynchronous write-inhibit signal - LOW blocks write cycles regardless of R/W state |
| A0L–A10L / A0R–A10R | Address inputs (left/right) | 11-bit address buses selecting one of 2048 memory locations per port |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data paths; high-Z when OE HIGH or CE HIGH |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port architecture | Enables true concurrent read/write access across independent left/right interfaces without arbitration overhead |
| SLAVE-specific BUSY interface | Accepts external BUSY signals to gate writes - eliminates need for discrete logic in width-expanded systems |
| Low-power standby modes | Full standby current as low as 0.2 mA (SA version) enables battery-backed operation in power-constrained designs |
| TTL-compatible signaling | Operates directly with legacy 5V microcontrollers and FPGAs without level-shifting circuitry |
| Industrial temperature qualification | Guaranteed operation from –40°C to +85°C supports deployment in motor drives, PLCs, and outdoor telecom equipment |
Applications
| Real-Time Motion Control | Avionics Data Buffering |
|---|---|
|
Use Scenario: Simultaneous position feedback capture (left port) and command execution (right port) in servo drive firmware. IC Role / Device Role / Timing Role: SLAVE dual-port RAM providing non-blocking data exchange between FPGA motion sequencer and ARM-based safety monitor. Use Value: 55 ns tRC enables sub-100 ns inter-port latency, eliminating polling delays in closed-loop timing-critical paths. |
Use Scenario: Buffered telemetry packet assembly where sensor acquisition and downlink transmission occur concurrently. IC Role / Device Role / Timing Role: SLAVE memory in a 32-bit-wide IDT7132/7142 array, synchronized by master BUSY arbitration. Use Value: FP48 hermetic packaging ensures reliability under thermal cycling and vibration in airborne environments. |
| Industrial PLC I/O Mapping | Test Equipment Pattern Memory |
|
Use Scenario: Mapping physical I/O states (left port) to ladder logic execution engine (right port) with deterministic update timing. IC Role / Device Role / Timing Role: SLAVE device receiving BUSY assertions from IDT7132 master during address collisions in distributed I/O backplane. Use Value: Input-only BUSY pins simplify hardware design - no pull-up resistors or open-drain drivers required on slave side. |
Use Scenario: Storing stimulus/response vectors for automated functional testing of ASICs with parallel test channels. IC Role / Device Role / Timing Role: Dual-port SRAM enabling simultaneous vector loading (left) and result capture (right) at 18.2 MHz effective rate. Use Value: 5V TTL compatibility allows direct interfacing with legacy pattern generators and logic analyzers. |
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 CY7C1371DV33-166BZI | 3.3V core, 166 MHz QDR interface, 1M × 18 organization - not pin- or voltage-compatible | Targets high-speed networking buffers; requires level shifters and layout redesign for 5V systems | Select only if migrating to 3.3V architecture and needing QDR burst capability |
| IDT7132SA55L48B | Same FP48 package, 55 ns speed grade, but functions as MASTER with BUSY outputs and on-chip arbitration | Used in standalone dual-port or width-expansion master role - cannot substitute directly as SLAVE | Required when building MASTER/SLAVE pair; must co-deploy with 7142SA55L48B for full BUSY-controlled expansion |
Compared with CY7C1371DV33-166BZI, 7142SA55L48B offers drop-in 5V TTL compatibility and BUSY-input simplicity for legacy industrial designs; compared with IDT7132SA55L48B, it provides dedicated SLAVE functionality with no arbitration logic - essential for predictable write-inhibit behavior in width-expanded arrays.
Availability
7142SA55L48B is available at Aetrix Electronics and suitable for real-time motion control, avionics buffering, and industrial PLC I/O mapping requiring stable component supply, long-term obsolescence management, and traceable sourcing for Class 3 industrial deployments.
Supply support for 7142SA55L48B 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) was a fabless semiconductor company specializing in timing, memory, and interface ICs before its acquisition by Renesas in 2019. Its dual-port SRAM portfolio emphasized deterministic real-time performance and industrial reliability.
The IDT7142 product line delivers SLAVE-configured dual-port SRAMs optimized for width-expansion architectures with external BUSY arbitration - targeting applications where predictable, hardware-enforced memory access conflict resolution is mandatory.
FAQ
Is 7142SA55L48B pin-compatible with IDT7132SA55L48B?
No. While both use the 48-pin flatpack (FP48) package and share identical pin counts and physical layout, 7142SA55L48B has BUSYL/BUSYR as inputs, whereas IDT7132SA55L48B drives them as open-drain outputs. Swapping them without modifying BUSY routing will cause functional failure. 7142SA55L48B must be used as SLAVE alongside IDT7132SA55L48B as MASTER.
What is the maximum operating frequency supported by 7142SA55L48B?
The 7142SA55L48B does not specify a clock frequency. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 55 ns, implying a theoretical maximum sustained read rate of ~18.2 MHz. Actual system throughput depends on address setup, hold, and enable timing margins - not a synchronous clock input.
Does 7142SA55L48B support battery backup operation?
No. Battery backup with 2V data retention is exclusive to LA-suffixed variants (e.g., 7142LA55L48B). The "SA" suffix in 7142SA55L48B denotes standard active power consumption (325 mW typ.), and data retention below 4.5 V is not guaranteed. For battery-backed operation, specify the LA version.
Can 7142SA55L48B operate as a standalone dual-port RAM without a master device?
Yes - but without BUSY arbitration. As a SLAVE, 7142SA55L48B functions as a fully independent dual-port SRAM when BUSYL and BUSYR are held HIGH (e.g., pulled up to VCC via 270 Ω resistors). In this mode, it behaves like a standard dual-port RAM with no hardware conflict detection - software must manage address contention.
What are the DC input voltage limits for 7142SA55L48B control pins?
Per datasheet Table 03, VIH (input high) is 2.2 V minimum and 6.0 V absolute maximum; VIL (input low) is –0.5 V minimum (for pulses <10 ns) and 0.8 V maximum. Exceeding VCC + 10% (5.5 V) on any input risks permanent damage - VTERM rating is –0.5 V to +7.0 V only under transient stress conditions, not operational use.
7142SA55L48B 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:
- 55ns
- Access Time:
- 55 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)
7142SA55L48B FAQ
1.How can I place an order for 7142SA55L48B through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA55L48B 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 7142SA55L48B reliable?
The price and inventory of 7142SA55L48B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA55L48B is usually 5 days.
3.What payment methods are accepted for 7142SA55L48B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA55L48B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA55L48B?
7142SA55L48B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA55L48B 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 7142SA55L48B?
For technical support, including 7142SA55L48B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA55L48B requirements.
6.How does Aetrix verify that 7142SA55L48B is sourced from the original manufacturer or authorized distributors?
All 7142SA55L48B 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 7142SA55L48B meets industry standards.
7.What is the process for return or replacement of 7142SA55L48B?
All 7142SA55L48B units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA55L48B, 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 7142SA55L48B part is unused and in its original packaging.
Return procedure for 7142SA55L48B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA55L48B Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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