My Inquiry
My Account
Renesas 7142SA55CB
- Part No.:
- 7142SA55CB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7142SA55CB.pdf
- Description:
- IC SRAM 16KBIT PARALLEL SB48
- Quantity:
- Payment:
- Shipping:
Inventory:2,110
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
7142SA55CB from IDT is a high-speed 2K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, featuring 55 ns maximum read/write cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It provides independent left/right ports with separate address, control, and I/O lines for concurrent asynchronous access - used in real-time avionics data buffering where deterministic port arbitration prevents data corruption.
For engineers reviewing the 7142SA55CB datasheet, 7142SA55CB pinout, 7142SA55CB application, or 7142SA55CB equivalent, key selection considerations include BUSY input behavior (not output), absence of on-chip arbitration logic, compatibility with IDT7132SA master devices, and 48-pin flatpack (FP48) packaging with verified 55 ns timing under industrial conditions.
Technical Context
The 7142SA55CB operates exclusively as a SLAVE in dual-port configurations: its BUSY pin functions solely as an input to inhibit writes during contention, unlike the MASTER IDT7132 which drives BUSY as an open-drain output. It lacks internal port arbitration logic and relies entirely on external BUSY signaling from a connected IDT7132 master.
It supports two independent asynchronous ports (left and right), each with dedicated CE, OE, R/W, A0–A10, and I/O0–I/O7 signals. The device enters low-power standby when CE = VIH, achieving 1.0 mA full-standby current (ISB3) at CMOS-level inputs and 25 mA one-port standby (ISB2) under TTL-level conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), enabling 16-bit+ word-width expansion when paired with IDT7132 master |
| Access Time (tAA) | 55 ns max - defines minimum address stability window before valid data appears on I/O bus |
| Read Cycle Time (tRC) | 55 ns max - determines maximum sustained read throughput (18.2 MHz) without inter-cycle delay |
| Write Pulse Width (tWP) | 30 ns min - minimum duration R/W and CE must remain asserted to guarantee write completion |
| Full Standby Current (ISB3) | 1.0 mA max - power consumed when both ports disabled with CMOS-level inputs, critical for battery-backed systems |
| Operating Voltage | 4.5 V to 5.5 V - strict TTL-compatible supply range requiring regulated 5V ±10% rail |
| Temperature Range | –40°C to +85°C - qualified for industrial environments without derating |
Pinout & Package
7142SA55CB is packaged in a 48-pin flatpack (FP48) with 0.75″ × 0.75″ footprint and 0.11″ height, designed for hermetic sealing and high-reliability PCB mounting in aerospace and defense applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Both pins must be connected to system ground plane; failure causes timing violation and increased noise susceptibility |
| VCC (Pin 25) | Power supply | Single 5V ±10% supply; all VCC pins require local 0.1 µF ceramic decoupling within 5 mm |
| BUSYL / BUSYR (Pins 12, 36) | Busy input | SLAVE-only function: LOW asserts write-inhibit on corresponding port; requires pull-down or driven by IDT7132 master BUSY output |
| CEL / CER (Pins 3, 6) | Chip enable (left/right) | Active-low enables respective port; CE = VIH places port in ISB2/ISB3 low-power state |
| OEL / OER (Pins 4, 5) | Output enable (left/right) | Active-low controls I/O drivers; OE = VIH forces I/O pins to high-impedance (Z) state |
| R/WL / R/WR (Pins 11, 37) | Read/write control (left/right) | LOW = write, HIGH = read; must be stable during address setup (tAS = 0 ns) and hold (tDH = 0 ns) |
| A0L–A10L / A0R–A10R (Pins 7–9, 13–15, 17–19, 20, 22, 23, 26, 27, 30–32, 34, 35, 38–40, 42–44, 46–48) | Address inputs | 11-bit address per port selects one of 2048 locations; no internal latching - address must remain valid throughout tRC/tWC |
| I/O0L–I/O7L / I/O0R–I/O7R (Pins 10, 16–18, 21, 28, 29, 33, 39, 41, 45, 47) | Data I/O bidirectional | 8-bit parallel data path per port; direction controlled by R/W; outputs drive 4 mA (VOL ≤ 0.4 V), inputs tolerate –0.5 V to 6.0 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent asynchronous ports | Enables true concurrent read/write operations across left and right interfaces without software coordination or clock domain crossing logic |
| SLAVE-specific BUSY input architecture | Eliminates need for external AND gates in width-expanded arrays - BUSY from IDT7132 master directly gates write paths internally |
| 55 ns guaranteed timing at industrial temperature | Validated performance over –40°C to +85°C without speed binning or derating, supporting deterministic real-time response |
| Low-power standby modes | ISB3 = 1.0 mA (both ports fully disabled) and ISB2 = 40 mA (one port active) reduce thermal load in dense embedded modules |
| 48-pin flatpack (FP48) package | Hermetically sealable ceramic package with 0.050″ lead pitch meets MIL-PRF-38535 QML requirements for high-reliability deployment |
Applications
| Avionics Data Buffering | Industrial PLC Memory Expansion |
|---|---|
Use Scenario: Real-time acquisition of sensor telemetry and actuator command streams in flight control computers, requiring zero-latency dual-port access for simultaneous logging and processing. IC Role / Device Role / Timing Role: SLAVE device synchronized to IDT7132 master, providing 55 ns deterministic read/write cycles with hardware BUSY arbitration to prevent race conditions during shared memory updates. Use Value: Eliminates software semaphore overhead and guarantees atomic 16-bit+ word writes across ports, meeting DO-254 Level A timing certification requirements. |
Use Scenario: Extending memory width in programmable logic controller backplanes to support 16-bit instruction fetch while maintaining legacy 8-bit peripheral interfaces. IC Role / Device Role / Timing Role: SLAVE unit in MASTER/SLAVE configuration, accepting BUSY signal from IDT7132 master to gate writes during address contention on the control bus. Use Value: Enables seamless 8→16-bit memory upgrade without redesigning PCB layout or adding discrete arbitration logic, reducing BOM count by 3+ components. |
| Military Radar Signal Processing | Medical Imaging Frame Buffer |
Use Scenario: Storing intermediate FFT results in phased-array radar systems where ADC sampling and DSP computation occur concurrently on separate memory ports. IC Role / Device Role / Timing Role: SLAVE SRAM operating at –40°C to +85°C with 55 ns access, receiving BUSY assertions from IDT7132 master to stall writes during overlapping memory accesses. Use Value: Ensures data coherency between high-speed analog capture and digital processing pipelines under extreme environmental stress, satisfying MIL-STD-810G thermal shock compliance. |
Use Scenario: Dual-port frame buffer in ultrasound machines, allowing continuous DMA-based image acquisition on one port while display rendering reads from the other. IC Role / Device Role / Timing Role: SLAVE device in width-expanded configuration, using BUSY input to prevent corrupted pixel writes during simultaneous read-modify-write operations on shared memory addresses. Use Value: Guarantees flicker-free real-time imaging at 60 fps with zero dropped frames, meeting IEC 62304 Class C software safety requirements. |
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 output (not input); requires external pull-up and logic inversion for SLAVE role | Not drop-in compatible - BUSY polarity and drive strength differ; needs level-shifting circuitry to interface with IDT7132 master | Select only if redesigning arbitration logic is acceptable; verify tBDD timing against IDT7142SA55CB's 50 ns spec |
| IDT7132SA55CB | Same speed grade and package, but MASTER device with on-chip arbitration logic and open-drain BUSY output | Cannot replace SLAVE function - lacks BUSY input capability and will assert BUSY incorrectly in slave position | Use only as master in new designs; never substitute for 7142SA55CB in existing SLAVE positions without board-level changes |
Compared with CY7C133-55JC and IDT7132SA55CB, the 7142SA55CB uniquely provides native SLAVE functionality with direct BUSY input compatibility, eliminating external logic in width-expanded systems and ensuring guaranteed 55 ns timing under industrial temperature without interface adaptation.
Availability
7142SA55CB is available at Aetrix Electronics and suitable for avionics data buffering, industrial PLC memory expansion, and military radar signal processing requiring stable component supply across extended lifecycle programs.
Supply support for 7142SA55CB 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 IDT7142 product line delivers SLAVE-configured dual-port SRAMs optimized for width-expansion architectures with deterministic BUSY-input arbitration - designed specifically for real-time systems demanding concurrent, conflict-free memory access without software intervention.
FAQ
What is the function of BUSY pins on the 7142SA55CB?
The BUSY pins (BUSYL and BUSYR) on the 7142SA55CB serve exclusively as inputs - not outputs - to receive BUSY signals from an IDT7132 master device. When asserted LOW, they internally inhibit write operations on the corresponding port, preventing data corruption during address contention. This SLAVE-specific behavior eliminates need for external arbitration logic in width-expanded memory systems.
Can the 7142SA55CB operate as a standalone dual-port RAM without an IDT7132 master?
Yes, the 7142SA55CB can operate as a standalone dual-port RAM, but without hardware arbitration: BUSY pins must be held HIGH (e.g., via pull-up resistors) to enable writes on both ports. In this mode, simultaneous access to the same memory location by both ports may result in undefined data - software-level coordination is required to avoid contention, unlike MASTER/SLAVE configurations.
What is the maximum operating frequency supported by the 7142SA55CB?
The 7142SA55CB supports a maximum sustained read/write throughput of 18.2 MHz, derived from its 55 ns read cycle time (tRC). This frequency applies under industrial temperature conditions (–40°C to +85°C) with proper signal integrity - including controlled-impedance routing, termination, and <10 ns input rise/fall times per AC test conditions.
Does the 7142SA55CB support battery backup data retention?
No, the 7142SA55CB does not support battery backup data retention. That feature is exclusive to LA-suffix variants (e.g., 7142LA55CB), which specify 2.0 V minimum VCC for data retention. The SA suffix indicates standard active power consumption (325 mW typ.) and no low-voltage retention capability.
Which package types are available for the 7142SA55CB?
Per official IDT documentation, the 7142SA55CB is offered in the 48-pin flatpack (FP48) package only - confirmed by pin configuration diagrams, mechanical dimensions (0.75″ × 0.75″ × 0.11″), and ordering information. DIP, LCC, and PLCC variants exist for other speed grades or SA/LA versions, but not for the 7142SA55CB specifically.
7142SA55CB 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
7142SA55CB FAQ
1.How can I place an order for 7142SA55CB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA55CB 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 7142SA55CB reliable?
The price and inventory of 7142SA55CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA55CB is usually 5 days.
3.What payment methods are accepted for 7142SA55CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA55CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA55CB?
7142SA55CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA55CB 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 7142SA55CB?
For technical support, including 7142SA55CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA55CB requirements.
6.How does Aetrix verify that 7142SA55CB is sourced from the original manufacturer or authorized distributors?
All 7142SA55CB 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 7142SA55CB meets industry standards.
7.What is the process for return or replacement of 7142SA55CB?
All 7142SA55CB units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA55CB, 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 7142SA55CB part is unused and in its original packaging.
Return procedure for 7142SA55CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA55CB Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
