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Texas Instruments SN74ACT7882-20FN
- Part No.:
- SN74ACT7882-20FN
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
SN74ACT7882-20FN.pdf
- Description:
- IC FIFO SYNC 2KX18 13NS 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,251
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Product details
Overview
SN74ACT7882-20FN from Texas Instruments is a clocked 2048 × 18-bit asynchronous FIFO memory IC with independent read/write clocks, 11 ns access time, programmable almost-full/almost-empty flag, and 68-pin PLCC (FN) package. It enables high-speed data buffering between mismatched clock domains in telecom line cards and industrial protocol gateways.
For engineers reviewing the SN74ACT7882-20FN datasheet, SN74ACT7882-20FN pinout, SN74ACT7882-20FN application, or SN74ACT7882-20FN equivalent, key selection criteria include its 50 MHz maximum operating frequency, dual-clock synchronization capability, 18-bit parallel I/O width, and support for cascaded depth/width expansion in real-time data acquisition systems.
Technical Context
The SN74ACT7882-20FN implements a synchronous write control path driven by WRTCLK and asynchronous read path synchronized to RDCLK, enabling true clock domain crossing. Its internal 2048-word × 18-bit RAM array supports concurrent read/write operations without bus contention.
Status flag logic generates HF (half-full), IR (input-ready), OR (output-ready), and programmable AF/AE flags using dedicated control inputs DAF and RESET. The device operates across 4.5–5.5 V supply and 0°C–70°C ambient, with TTL-compatible input thresholds and 16 mA sink / –8 mA source output drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 2048 × 18 bits - provides 36 Kbit buffer capacity for burst-mode packet storage |
| Max Clock Frequency | 50 MHz - supports 20 ns minimum clock period for WRTCLK/RDCLK in high-throughput interfaces |
| Access Time | 11 ns @ 50-pF load - ensures fast data transfer latency in real-time control loops |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of ±10% regulation variation |
| I/O Drive Strength | 16 mA sink / –8 mA source - directly drives 50 Ω transmission lines or multiple TTL loads without buffers |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including network infrastructure equipment |
Pinout & Package
SN74ACT7882-20FN uses a 68-pin plastic leaded chip carrier (PLCC-FN) package with J-lead geometry, 0.050-inch pitch, and JEDEC MS-018 compliance. Thermal resistance θJA = 39°C/W enables operation at full speed without forced airflow in compact enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D17 | Data inputs | 18-bit parallel write data bus; D9–D0 used to program AF/AE offset during reset |
| Q0–Q17 | Data outputs | 18-bit noninverting read data bus; high-impedance when OE = low |
| WRTCLK, RDCLK | Free-running clocks | Independent system clocks for write/read synchronization; no phase relationship required |
| WRTEN1/WRTEN2, RDEN1/RDEN2 | Enable controls | Two-input AND logic per port prevents spurious writes/reads; first word bypasses enable check |
| OE | Output enable | Active-high tri-state control; must be asserted before RDCLK rising edge to avoid bus contention |
| RESET | Master initialization | Asynchronous reset requiring ≥4 WRTCLK/RDCLK cycles to clear pointers and flags |
| AF/AE, HF, IR, OR | Status flags | Open-collector outputs indicating FIFO fill level; AF/AE boundary programmable via DAF and RESET sequence |
| DAF | Flag programming control | Defines AF/AE offset value X: low-to-high transition captures D9–D0 as custom X; high = default X=256 |
Key Features
| Feature | Design Value |
|---|---|
| Independent asynchronous I/O | Enables seamless bridging between 33 MHz PCI and 66 MHz DSP buses without handshake logic |
| Programmable AF/AE flag | Customizable fill-level threshold (X = 0–1023) allows dynamic flow control in variable-rate streaming applications |
| Cascadable architecture | Supports 4096×18 depth expansion or 2048×36 width expansion using only standard control signals |
| High-output-drive ACT logic | 16 mA sink current eliminates need for external bus transceivers in backplane interface designs |
| Input/output-ready flags | IR/OR signals provide hardware handshaking for zero-software-overhead DMA transfers |
Applications
| Telecom Line Card Buffering | Industrial Protocol Gateway |
|---|---|
Use Scenario: Absorbing jitter between TDM framer and ATM segmentation/reassembly engines in DSLAM line cards. IC Role / Device Role / Timing Role: Clock-domain crossing FIFO that decouples 8 kHz TDM timing from 155 Mbps ATM cell rate. Use Value: Eliminates software-based double-buffering, reduces latency variation from >50 µs to fixed 11 ns access + clock skew. | Use Scenario: Bridging Modbus RTU serial data to EtherNet/IP packets in factory-floor PLC gateways. IC Role / Device Role / Timing Role: Asynchronous data staging buffer isolating 9.6 kbps RS-485 timing from 100 Mbps Ethernet MAC timing. Use Value: Prevents UART overrun errors during Ethernet packet collisions; IR/OR flags enable deterministic interrupt-driven transfers. |
| Real-Time Data Acquisition | DSP-Based Motor Control |
Use Scenario: Capturing high-speed analog samples from 1 MSPS ADC into FPGA-based FFT engine. IC Role / Device Role / Timing Role: Burst-mode sample collector synchronizing ADC's 10 MHz sampling clock to FPGA's 50 MHz processing clock. Use Value: Enables continuous capture without dead time; HF flag triggers DMA fetch before buffer overflow. | Use Scenario: Feeding position feedback data from resolver-to-digital converter to C2000™ MCU PWM modules. IC Role / Device Role / Timing Role: Timing isolation buffer between 10 kHz RDC update rate and 100 MHz C2000 instruction cycle. Use Value: Guarantees deterministic 2-cycle latency from sample capture to PWM update; AF/AE prevents torque ripple from data starvation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT7881-20FN | Same 68-pin PLCC package and pinout; 1024 × 18 organization (half depth) | Lower buffer capacity suits cost-sensitive designs with ≤18 Kbit requirements | Select when reduced memory depth is acceptable and BOM consolidation with legacy designs is prioritized |
| SN74ACT7811-20FN | Identical 2048 × 18 organization but lacks programmable AF/AE flag and DAF input | Fixed half-full/half-empty thresholds only; no custom flow-control boundary | Choose for simpler control logic where adaptive fill-level signaling is unnecessary |
Compared with SN74ACT7881-20FN and SN74ACT7811-20FN, the SN74ACT7882-20FN uniquely delivers both full-depth buffering and field-programmable almost-full/almost-empty thresholds-enabling adaptive flow control in variable-bandwidth systems without firmware intervention.
Availability
SN74ACT7882-20FN is available at Aetrix Electronics and suitable for telecom infrastructure, industrial protocol conversion, real-time data acquisition, and motor control applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT7882-20FN 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability interface and memory products.
The SN74ACT7882-20FN belongs to TI's Widebus™ family of high-speed TTL-compatible FIFOs, engineered specifically for clock-domain isolation and burst-mode data buffering in communications and industrial control systems.
FAQ
What is the maximum operating frequency of the SN74ACT7882-20FN?
The SN74ACT7882-20FN supports a maximum clock frequency of 50 MHz for both WRTCLK and RDCLK inputs, corresponding to a 20 ns minimum clock period. This rating is verified under recommended operating conditions (VCC = 4.5–5.5 V, TA = 0°C–70°C) with CL = 50 pF load, and aligns with its -20 speed grade designation in the SN74ACT7882 family.
How does the programmable AF/AE flag work on the SN74ACT7882-20FN?
The SN74ACT7882-20FN's AF/AE flag boundary is set during RESET using the DAF input: holding DAF low while asserting RESET programs D9–D0 as custom offset X, while holding DAF high selects default X = 256. AF/AE goes high when words ≤ X or ≥ (2048 – X), enabling adaptive flow control without software polling.
Can the SN74ACT7882-20FN be cascaded for larger memory depth or width?
Yes, the SN74ACT7882-20FN supports both depth and width expansion. For depth expansion (e.g., 4096 × 18), connect OR of one device to IR of the next in series. For width expansion (e.g., 2048 × 36), tie all control signals in parallel and combine Q0–Q17 outputs. Application diagrams in the datasheet confirm this capability for the SN74ACT7882-20FN.
What package type and pin count does the SN74ACT7882-20FN use?
The SN74ACT7882-20FN uses a 68-pin plastic leaded chip carrier (PLCC) package designated FN, with J-lead geometry and JEDEC MS-018 compliance. Its footprint measures 1.158 inches × 1.158 inches (29.41 mm × 29.41 mm), and thermal resistance is θJA = 39°C/W, making it suitable for convection-cooled industrial PCB layouts.
Does the SN74ACT7882-20FN require power-on reset sequencing?
Yes, the SN74ACT7882-20FN requires a valid RESET pulse upon power-up to initialize internal read/write pointers and status flags. The datasheet specifies that RESET must be held low for at least four WRTCLK and RDCLK cycles to ensure OR, HF, and IR are low and AF/AE is high-failure to do so may result in undefined flag states or pointer misalignment.
SN74ACT7882-20FN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 68-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 36K (2K x 18)
- Function:
- Synchronous
- Data Rate:
- 50MHz
- Access Time:
- 13ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 400µA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.23x24.23)
SN74ACT7882-20FN FAQ
1.How can I place an order for SN74ACT7882-20FN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT7882-20FN 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 SN74ACT7882-20FN reliable?
The price and inventory of SN74ACT7882-20FN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT7882-20FN is usually 5 days.
3.What payment methods are accepted for SN74ACT7882-20FN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT7882-20FN transactions.
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4.How is shipping managed for SN74ACT7882-20FN?
SN74ACT7882-20FN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT7882-20FN 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 SN74ACT7882-20FN?
For technical support, including SN74ACT7882-20FN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT7882-20FN requirements.
6.How does Aetrix verify that SN74ACT7882-20FN is sourced from the original manufacturer or authorized distributors?
All SN74ACT7882-20FN 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 SN74ACT7882-20FN meets industry standards.
7.What is the process for return or replacement of SN74ACT7882-20FN?
All SN74ACT7882-20FN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT7882-20FN, 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 SN74ACT7882-20FN part is unused and in its original packaging.
Return procedure for SN74ACT7882-20FN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ACT7882-20FN Tags
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