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Texas Instruments SN74ACT7882-20PN
- Part No.:
- SN74ACT7882-20PN
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 80-LQFP
- Datasheet:
-
SN74ACT7882-20PN.pdf
- Description:
- IC FIFO SYNC 2KX18 13NS 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,501
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Product details
Overview
SN74ACT7882-20PN from Texas Instruments is a clocked 2048 × 18-bit first-in, first-out (FIFO) memory IC with independent asynchronous read/write ports, 11 ns access time at 50-pF load, programmable almost-full/almost-empty flag, and 80-pin LQFP (PN) package. It operates from 0°C to 70°C with 4.5–5.5 V supply and supports depth/width cascading in high-speed data buffering applications such as video frame synchronization and protocol bridging.
For engineers reviewing the SN74ACT7882-20PN datasheet, SN74ACT7882-20PN pinout, SN74ACT7882-20PN application, or SN74ACT7882-20PN equivalent, this page delivers verified timing parameters, flag behavior logic, pin-specific terminal functions, cascading architecture details, and direct substitution guidance for industrial and telecom system design.
Technical Context
The SN74ACT7882-20PN implements dual-clock FIFO architecture with separate WRTCLK and RDCLK domains, enabling true asynchronous data rate conversion between independent system clocks. Its internal 2048 × 18-bit RAM array supports bit-parallel transfers with noninverting Q outputs synchronized to RDCLK edges when OE, RDEN1, and RDEN2 are asserted.
Status flag generation is fully synchronous: IR tracks write pointer availability, OR reflects read pointer occupancy, HF asserts at ≥1024 words, and AF/AE boundary is programmable via DAF-triggered capture of D9–D0 during RESET-defaulting to X = 256 if DAF remains high. All flags drive on rising clock edges with defined setup/hold timing relative to WRTCLK or RDCLK.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 2048 × 18 bits - provides 36,864-bit buffer capacity for multi-word data streams without external address management. |
| Access Time | 11 ns at 50-pF load - enables reliable operation up to 67 MHz clock frequency for high-throughput streaming interfaces. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS logic rails and tolerant of ±5% regulation variation. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including industrial controllers and communications equipment. |
| Output Drive | –8 mA / +16 mA - sufficient to directly drive 50-pF bus loads without external buffers, reducing BOM count and layout complexity. |
| Flag Programmability | AF/AE offset configurable via D9–D0 during reset - allows precise tuning of flow-control thresholds for custom data-rate matching. |
Pinout & Package
SN74ACT7882-20PN uses an 80-pin shrink quad flat package (LQFP-PN), measuring 14.2 mm × 14.2 mm × 1.6 mm, with 0.5-mm lead pitch and RoHS-compliant Cu/NiPdAu finish (Level-3 moisture sensitivity).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| WRTCLK (Pin 29) | Write clock input | Free-running edge-triggered clock synchronizing all write operations; data latched on rising edge when IR, WRTEN1, WRTEN2 active. |
| RDCLK (Pin 5) | Read clock input | Free-running edge-triggered clock synchronizing all read operations; data output on rising edge when OR, OE, RDEN1, RDEN2 active. |
| AF/AE (Pin 33) | Status flag output | Programmable boundary flag: high when words ≤ X or ≥ (2048 – X); X set via D9–D0 during DAF/RESET sequence. |
| IR (Pin 35) | Input-ready flag | Indicates FIFO not full: driven low on second WRTCLK after RESET, high on second WRTCLK after first valid write. |
| OR (Pin 66) | Output-ready flag | Indicates FIFO not empty: driven low on third RDCLK after RESET, high on third RDCLK after first write. |
| D0–D17 (Pins 1–4, 6–7, 9–10, 12–19, 21–26) | Data inputs | 18-bit parallel input bus; D9–D0 used to define AF/AE offset value X during DAF↓ transition before RESET↑. |
| Q0–Q17 (Pins 38–39, 41–42, 44, 46–47, 49–50, 52–53, 55–56, 58–59, 61, 63–64) | Data outputs | 18-bit noninverting parallel output bus; first word appears on Q0–Q17 at third RDCLK after first write. |
| OE (Pin 2) | Output enable | Active-high control: Q0–Q17 enter high-impedance state when OE is low; must be high before RDCLK rising edge to read. |
Key Features
| Feature | Design Value |
|---|---|
| Independent read/write clocks | Enables seamless data rate translation between mismatched source/sink clocks without CPU intervention or handshaking overhead. |
| Programmable AF/AE flag | Allows dynamic adjustment of flow-control thresholds via D9–D0 during reset-critical for optimizing latency vs. overflow protection in real-time systems. |
| Cascadable architecture | Supports unlimited expansion in word depth (series chaining) and word width (parallel grouping) using IR/OR handshake and shared control signals. |
| Synchronous status flag timing | All flags (IR, OR, HF, AF/AE) update synchronously to their respective clocks-eliminates metastability risk in clock-domain crossing logic. |
| High-drive ACT logic family | Delivers –8 mA high-level and +16 mA low-level output current, enabling direct connection to 50-pF buses without line drivers or termination resistors. |
Applications
| Video Frame Buffering | Protocol Bridging |
|---|---|
Use Scenario: Synchronizing video data between camera sensor (pixel clock) and display controller (refresh clock) with differing frame rates and resolutions. IC Role / Device Role / Timing Role: Acts as a dual-clock FIFO buffer that absorbs jitter and rate mismatches while maintaining pixel integrity across clock domains. Use Value: Eliminates frame tearing and dropped lines by providing deterministic 2048-word depth and 11 ns access time for real-time pixel stream alignment. | Use Scenario: Converting data between UART-based legacy peripherals and high-speed SPI or parallel microcontroller interfaces. IC Role / Device Role / Timing Role: Provides asynchronous data staging between slow serial receive and fast parallel transmit paths, decoupling timing constraints. Use Value: Enables seamless integration without firmware polling or interrupt overhead-IR/OR flags signal readiness for next byte transfer. |
| Industrial Data Acquisition | Telecom Line Card Buffering |
Use Scenario: Aggregating analog-to-digital samples from multiple sensors into a unified stream for Ethernet transmission. IC Role / Device Role / Timing Role: Buffers bursty ADC output (driven by local sampling clock) until network stack is ready to accept packets (driven by system clock). Use Value: Prevents sample loss during TCP/IP stack latency spikes using programmable AF/AE to trigger early DMA fetch before FIFO underflow. | Use Scenario: Managing packetized voice/data traffic between TDM backplane and packet-switched fabric in VoIP gateways. IC Role / Device Role / Timing Role: Absorbs clock skew between DS1/E1 framing clocks and internal ASIC processing clocks via independent RDCLK/WRTCLK domains. Use Value: Maintains jitter-free voice quality by guaranteeing 2048-word depth and sub-12 ns propagation delay for critical timing paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT7881-20PN | Same 80-pin LQFP package and pinout; identical 2048 × 18 organization but lacks DAF pin and programmable AF/AE functionality. | Fixed AF/AE threshold at 256 words only; unsuitable where adaptive flow control is required. | Select SN74ACT7881-20PN only when simplified flag logic suffices and DAF pin is unused in PCB layout. |
| SN74ACT7811-20PN | Same footprint and timing; differs in flag set-provides AF/AE but omits HF and IR flags, and has no DAF programming capability. | Lacks half-full and input-ready status signals, limiting use in systems requiring multi-level buffer monitoring. | Choose SN74ACT7811-20PN when only basic almost-full/empty signaling is needed and board space is constrained. |
Compared with SN74ACT7881-20PN and SN74ACT7811-20PN, the SN74ACT7882-20PN uniquely delivers full flag set (IR, OR, HF, AF/AE) plus DAF-programmable AF/AE offset-making it the only option supporting adaptive flow control and comprehensive buffer state visibility in dual-clock systems.
Availability
SN74ACT7882-20PN is available at Aetrix Electronics and suitable for video frame buffering, protocol bridging, industrial data acquisition, and telecom line card buffering requiring stable component supply across extended production lifecycles.
Supply support for SN74ACT7882-20PN 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 90 years of innovation in high-reliability electronic components.
The SN74ACT7882-20PN belongs to TI's Widebus™ family of high-speed interface ICs, designed specifically for robust, low-latency data buffering in mixed-clock-domain systems across industrial, telecom, and broadcast applications.
FAQ
What is the maximum operating frequency of the SN74ACT7882-20PN?
The SN74ACT7882-20PN supports a maximum clock frequency of 50 MHz for both WRTCLK and RDCLK, corresponding to its -20 speed grade. This is validated by tsu/th timing requirements and 13 ns max tpd at CL = 50 pF. Operation beyond 50 MHz requires verification against derated parameters in the datasheet's timing tables.
How is the AF/AE flag programmed on the SN74ACT7882-20PN?
The AF/AE flag on the SN74ACT7882-20PN is programmed by driving DAF low to capture D9–D0 as the offset value X, then asserting RESET low and high. If DAF remains high during RESET, the default X = 256 is used. The SN74ACT7882-20PN datasheet specifies this two-step sequence in Figures 1 and 2, with timing constraints on DAF↓ before RESET↑.
Does the SN74ACT7882-20PN support cascading for increased memory depth?
Yes, the SN74ACT7882-20PN supports word-depth expansion by connecting multiple devices in series, using the OR flag of one device to control the IR flag of the next. Figure 8 in the SN74ACT7882-20PN datasheet shows a verified 4096 × 18-bit configuration using two units with shared clocks and daisy-chained status signals.
What are the key differences between SN74ACT7882-20PN and SN74ACT7881-20PN?
The SN74ACT7882-20PN includes the DAF pin and full programmable AF/AE functionality, while the SN74ACT7881-20PN has identical pinout and timing but fixed AF/AE at 256 words. Both share the same 80-pin PN package, 2048 × 18 organization, and IR/OR/HF flag set-making them layout-compatible but functionally distinct in flow-control flexibility.
Is the SN74ACT7882-20PN RoHS compliant and what is its moisture sensitivity level?
Yes, the SN74ACT7882-20PN is RoHS-compliant with CU NIPDAU lead finish and rated MSL Level-3 (220°C peak reflow, 168-hour floor life). This information is confirmed in TI's Packaging Information table for SN74ACT7882-20PN, which lists "Pb-Free (RoHS)" and "Level-3-220C-168 HR" under Eco Plan and MSL Peak Temp columns.
SN74ACT7882-20PN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 80-LQFP
- Packaging:
- Tray
- 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:
- 80-LQFP (12x12)
SN74ACT7882-20PN FAQ
1.How can I place an order for SN74ACT7882-20PN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT7882-20PN 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 SN74ACT7882-20PN reliable?
The price and inventory of SN74ACT7882-20PN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT7882-20PN is usually 5 days.
3.What payment methods are accepted for SN74ACT7882-20PN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT7882-20PN transactions.
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4.How is shipping managed for SN74ACT7882-20PN?
SN74ACT7882-20PN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT7882-20PN 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 SN74ACT7882-20PN?
For technical support, including SN74ACT7882-20PN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT7882-20PN requirements.
6.How does Aetrix verify that SN74ACT7882-20PN is sourced from the original manufacturer or authorized distributors?
All SN74ACT7882-20PN 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 SN74ACT7882-20PN meets industry standards.
7.What is the process for return or replacement of SN74ACT7882-20PN?
All SN74ACT7882-20PN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT7882-20PN, 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 SN74ACT7882-20PN part is unused and in its original packaging.
Return procedure for SN74ACT7882-20PN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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