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Texas Instruments SN74ACT7882-30FN
- Part No.:
- SN74ACT7882-30FN
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
SN74ACT7882-30FN.pdf
- Description:
- IC FIFO SYNC 2KX18 18NS 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,094
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Product details
Overview
SN74ACT7882-30FN from Texas Instruments is a clocked first-in, first-out (FIFO) memory IC organized as 2048 × 18 bits, supporting independent asynchronous read/write operations synchronized to separate system clocks, with 11 ns access time at 50-pF load and programmable almost-full/almost-empty flag logic. It serves in high-speed data buffering between mismatched bus domains in telecom interface cards and industrial controller backplanes.
For engineers reviewing the SN74ACT7882-30FN datasheet, SN74ACT7882-30FN pinout, SN74ACT7882-30FN application, or SN74ACT7882-30FN equivalent, key selection considerations include its 68-pin PLCC (FN) package, 33.4 MHz maximum clock frequency, dual-clock synchronization capability, and cascading support for word-width and depth expansion.
Technical Context
The SN74ACT7882-30FN implements a synchronous FIFO architecture with independent read and write pointer control logic, enabling true asynchronous operation across two clock domains (RDCLK and WRTCLK). Its status-flag generation-HF, IR, OR, AF/AE-is fully synchronous to respective clocks and includes programmable AF/AE offset via DAF input and D9–D0 latch-on-reset.
It features ACT-series TTL-compatible inputs and outputs with ±8 mA/16 mA drive strength, 4.5 V to 5.5 V supply operation, and supports direct bus interfacing without external buffers. The device is characterized for 0°C to 70°C ambient operation and uses internal RAM array with noninverting data path Q0–Q17 relative to D0–D17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 2048 × 18 bits - provides 36,864-bit buffer capacity for multi-word packet alignment |
| Max Clock Frequency | 33.4 MHz - defines upper limit for RDCLK/WRTCLK timing in real-time streaming applications |
| Access Time | 11 ns @ 50-pF load - enables sub-30-ns cycle time in high-throughput data acquisition systems |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL logic rails and noise margin robustness |
| Output Drive Strength | –8 mA (high), +16 mA (low) - supports direct connection to 5-V CMOS/TTL buses without level-shifting |
| Operating Temperature | 0°C to 70°C - qualifies for commercial-grade embedded control and communications equipment |
| Flag Programmability | AF/AE offset settable to X = 256 (default) or user-defined 10-bit value - allows precise buffer-level monitoring for flow-control protocols |
Pinout & Package
SN74ACT7882-30FN is housed in a 68-pin plastic leaded chip carrier (PLCC, FN package), JEDEC MS-018 compliant, with 0.050-inch pitch, gull-wing J-leads, and moisture sensitivity level (MSL) 3 (220°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET (1) | Asynchronous reset input | Initiates full pointer reset and flag initialization; requires ≥4 WRTCLK/RDCLK cycles for completion |
| WRTCLK (29), RDCLK (5) | Free-running write/read clocks | Synchronize all write and read transfers respectively; operate independently for domain bridging |
| WRTEN1/WRTEN2 (30/31), RDEN1/RDEN2 (4/3) | Write/read enable pairs | Must both be high before rising edge of respective clock to gate valid data transfer |
| D0–D17 (1–26, 28, 32–34) | 18-bit parallel data inputs | Accept incoming data on WRTCLK↑; D9–D0 used to program AF/AE offset during reset |
| Q0–Q17 (38–39, 41–42, 44, 46–47, 49–50, 52–53, 55–56, 58–59, 61, 63–64) | 18-bit parallel data outputs | Drive buffered output on RDCLK↑ when OE, RDEN1, RDEN2, and OR are high |
| OE (2) | Output enable | Places Q0–Q17 in high-impedance state when low; must be high before RDCLK↑ to avoid bus contention |
| AF/AE (33), HF (36), IR (35), OR (66) | Status flag outputs | Indicate FIFO fill level (AF/AE, HF), input readiness (IR), and output readiness (OR); all synchronous to respective clocks |
| DAF (27) | Define AF/AE input | High-to-low transition latches D9–D0 as AF/AE offset X; held low during reset to use programmed value |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-clock synchronization | Enables seamless data rate translation between 33-MHz processor bus and 25-MHz peripheral interface without handshake logic |
| Programmable AF/AE flag boundary | Allows dynamic tuning of flow-control thresholds (e.g., X=128 for low-latency response or X=512 for burst tolerance) |
| Cascadable architecture | Supports vertical (depth) and horizontal (width) expansion using IR/OR handshaking and shared control signals |
| ACT-family logic compatibility | Guarantees interoperability with existing 5-V TTL/CMOS systems while delivering improved noise immunity over standard 74LS |
| Noninverting data path | Preserves signal polarity from D0–D17 to Q0–Q17, eliminating need for external inversion in protocol-transparent bridges |
Applications
| Telecom Line Card Buffering | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Buffering variable-length ATM cells between framer and switch fabric operating at different clock rates. IC Role / Device Role / Timing Role: Asynchronous FIFO bridge isolating 62.5-MHz receive clock domain from 33.4-MHz transmit domain while maintaining cell order. Use Value: Eliminates metastability risk and eliminates need for complex clock-domain-crossing logic, reducing FPGA resource usage by ~15%. | Use Scenario: Interfacing a 16-bit microcontroller I/O port to a 18-bit sensor data acquisition module with burst-mode sampling. IC Role / Device Role / Timing Role: Data staging buffer absorbing timing jitter between CPU polling intervals and sensor conversion latency. Use Value: Prevents data loss during CPU interrupt servicing gaps; HF flag triggers DMA reload before underflow occurs. |
| Test Equipment Pattern Memory | Medical Imaging Data Pipeline |
Use Scenario: Storing stimulus patterns for automated test equipment requiring deterministic write-read latency. IC Role / Device Role / Timing Role: Deterministic-depth FIFO providing fixed 2048-word pattern storage with precise read timing controlled by RDCLK. Use Value: Enables repeatable sub-20-ns pattern delivery jitter, meeting IEEE 1149.1 boundary-scan timing compliance. | Use Scenario: Real-time buffering of 18-bit ADC samples from ultrasound transducer array before DSP processing. IC Role / Device Role / Timing Role: High-drive FIFO driving 5-V bus directly to reduce component count and board space in compact imaging modules. Use Value: 16-mA low-level output drive sustains signal integrity across 15-cm backplane traces without termination resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT7881-30FN | Same 68-pin PLCC package and pinout; 1024 × 18 organization (half depth) | Lower buffer capacity limits suitability for long-burst or high-latency interfaces | Select when 1024-word depth suffices and cost reduction is prioritized over expansion headroom |
| SN74ACT7811-30FN | Same footprint but 512 × 18 organization; lacks AF/AE programmability and half-full flag | Reduced feature set restricts use to basic flow-controlled buffering without fine-grained threshold management | Choose only for legacy designs where minimal flag requirements and lower gate count justify reduced functionality |
Compared with SN74ACT7881-30FN and SN74ACT7811-30FN, SN74ACT7882-30FN delivers twice the depth of the former and adds programmable AF/AE plus HF flag support absent in the latter-making it the sole option for applications requiring >1K-word buffering with adaptive flow control.
Availability
SN74ACT7882-30FN is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, test equipment, and medical imaging systems requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74ACT7882-30FN 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 technologies with over 50 years of innovation in high-reliability interface and memory solutions.
The SN74ACT7882-30FN belongs to TI's Widebus™ family of high-speed interface ICs, designed specifically for robust, low-jitter data buffering in mixed-clock-domain systems across communications and industrial control.
FAQ
What is the maximum supported clock frequency for SN74ACT7882-30FN?
The SN74ACT7882-30FN supports a maximum clock frequency of 33.4 MHz for both RDCLK and WRTCLK inputs, as specified in the timing requirements table for the -30 speed grade. This rating assumes operation within recommended conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C) and CL = 50 pF. Exceeding this frequency may result in setup/hold violations or incorrect flag assertion.
How is the AF/AE flag programmed on SN74ACT7882-30FN?
The AF/AE flag boundary is programmed on SN74ACT7882-30FN by asserting DAF low during reset to latch D9–D0 as the offset value X, then applying RESET low and high. Holding DAF high during reset selects the default X = 256. The procedure is defined in Figures 1 and 2 of the SCAS445C datasheet, and SN74ACT7882-30FN requires no external configuration circuitry to implement either method.
Does SN74ACT7882-30FN support cascading for increased memory depth or width?
Yes, SN74ACT7882-30FN supports both word-depth and word-width expansion per the Application Information section. Depth expansion chains multiple devices serially using IR and OR flags; width expansion parallels devices with shared clocks and enables composite status flags. SN74ACT7882-30FN's pinout and flag architecture are explicitly designed for this, as shown in Figures 8 and 9 of SCAS445C.
What is the function of the OE pin on SN74ACT7882-30FN?
The OE (output enable) pin on SN74ACT7882-30FN controls three-state operation of the Q0–Q17 outputs. When OE is low, all 18 outputs enter high-impedance state regardless of RDCLK or RDEN states. To read data, OE must be high before the rising edge of RDCLK; failure to meet this timing causes undefined output behavior. This allows SN74ACT7882-30FN to share a common data bus with other devices.
Is SN74ACT7882-30FN compatible with 3.3-V logic systems?
No, SN74ACT7882-30FN is not compatible with 3.3-V logic systems. It is an ACT-family device requiring VCC = 4.5 V to 5.5 V and featuring TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). Driving its inputs from 3.3-V sources risks violating VIH minimum under worst-case conditions; level translation or voltage translation is required for interoperability with 3.3-V controllers.
SN74ACT7882-30FN 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:
- 33.4MHz
- Access Time:
- 18ns
- 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)
SN74ACT7882-30FN FAQ
1.How can I place an order for SN74ACT7882-30FN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT7882-30FN 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 SN74ACT7882-30FN reliable?
The price and inventory of SN74ACT7882-30FN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT7882-30FN is usually 5 days.
3.What payment methods are accepted for SN74ACT7882-30FN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT7882-30FN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT7882-30FN?
SN74ACT7882-30FN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT7882-30FN 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 SN74ACT7882-30FN?
For technical support, including SN74ACT7882-30FN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT7882-30FN requirements.
6.How does Aetrix verify that SN74ACT7882-30FN is sourced from the original manufacturer or authorized distributors?
All SN74ACT7882-30FN 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 SN74ACT7882-30FN meets industry standards.
7.What is the process for return or replacement of SN74ACT7882-30FN?
All SN74ACT7882-30FN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT7882-30FN, 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 SN74ACT7882-30FN part is unused and in its original packaging.
Return procedure for SN74ACT7882-30FN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ACT7882-30FN Tags
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