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Texas Instruments SN74ACT7803-15DL
- Part No.:
- SN74ACT7803-15DL
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT7803-15DL.pdf
- Description:
- IC FIFO SYNC 512X18 12NS 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,731
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Product details
Overview
SN74ACT7803-15DL from Texas Instruments is a 512 × 18-bit clocked FIFO memory IC with asynchronous read/write clocks, 12 ns access time (50-pF load), 67 MHz maximum data rate, and programmable almost-full/almost-empty flags. It serves as a high-speed asynchronous datapath buffer in digital communication interfaces between mismatched clock domains.
For engineers reviewing the SN74ACT7803-15DL datasheet, SN74ACT7803-15DL pinout, SN74ACT7803-15DL application, or SN74ACT7803-15DL equivalent, key selection considerations include its dual-clock synchronization architecture, 56-pin SSOP package, bidirectional/width-expansion capability without external logic, and support for industrial temperature range (0°C to 70°C).
Technical Context
The SN74ACT7803-15DL implements independent synchronous write and read control paths: WRTCLK triggers writes when WRTEN1 is high and WRTEN2 low, while RDCLK triggers reads when RDEN, OE1, and OE2 are low and OR is high. Input-ready (IR) and output-ready (OR) flags are edge-synchronized to their respective clocks.
It features a 512-word × 18-bit RAM core with status flag logic including half-full (HF), programmable almost-full/almost-empty (AF/AE), and reset-synchronized initialization. The AF/AE offset values (X/Y) are programmed via D0–D7 during reset using PEN, with default X = Y = 64.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory depth × width | 512 words × 18 bits - supports buffering of up to 9,216 bits of asynchronous data with full FIFO control. |
| Max clock frequency | 67 MHz - enables high-throughput data transfer in real-time digital systems such as video pipelines or bus bridges. |
| Access time | 12 ns (CL = 50 pF) - ensures minimal latency between clock edge and valid output data, critical for timing-critical interfaces. |
| Supply voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS logic families and industrial power rails. |
| Operating temperature | 0°C to 70°C - qualified for commercial and industrial embedded applications without extended thermal derating. |
| Output drive | 16 mA (Q outputs), 8 mA (flags) - sufficient to directly drive multiple CMOS inputs or short PCB traces without buffers. |
| Power dissipation capacitance | 53 pF - enables accurate dynamic power estimation at 5 MHz operation under typical load conditions. |
Pinout & Package
SN74ACT7803-15DL is packaged in a 56-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.635 mm (25-mil) center-to-center lead pitch and 300-mil body width. The package includes distributed VCC/GND pins to reduce simultaneous switching noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| WRTCLK (25) | Write clock input | Rising-edge-triggered write strobe; free-running and asynchronous to RDCLK; synchronizes IR and write pointer. |
| RDCLK (32) | Read clock input | Rising-edge-triggered read strobe; free-running and asynchronous to WRTCLK; synchronizes OR and read pointer. |
| D0–D17 (2–9,11–12,14–21) | Data input bus | 18-bit parallel input port; latched on WRTCLK↑ when WRTEN1=H, WRTEN2=L, and IR=H. |
| Q0–Q17 (33–34,36–38,40–43,45–49,51,53–55) | Data output bus | 18-bit parallel output port; driven on RDCLK↑ when RDEN=OE1=OE2=L and OR=H; tri-state when OE1 or OE2 high. |
| IR (28) | Input-ready flag | Output flag synchronized to WRTCLK↑; low indicates FIFO full and disables further writes. |
| OR (29) | Output-ready flag | Output flag synchronized to RDCLK↑; high indicates valid data present on Q0–Q17 and enables reads. |
| AF/AE (24) | Status flag | Programmable almost-full/almost-empty indicator; high when FIFO contains ≤X or ≥(512−Y) words; defaults to X=Y=64. |
| RESET (1) | Asynchronous reset | Active-low global reset requiring ≥4 rising edges on both WRTCLK and RDCLK to clear internal pointers and flags. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional configuration | Two SN74ACT7803-15DL devices can be interconnected for full-duplex buffering without external glue logic or direction control signals. |
| Width expansion | Multiple units support 36-bit or wider word widths (e.g., 512 × 36) by connecting D/Q buses and sharing clocks/controls. |
| Programmable status thresholds | AF/AE offset values X and Y are user-programmable via D0–D7 during reset, enabling custom flow-control sensitivity. |
| Output edge control (OEC™) | Texas Instruments patented circuit dampens simultaneous switching noise across all 18 outputs, improving signal integrity. |
| Low-power advanced CMOS | Idle ICC ≤ 400 µA and ∆ICC ≤ 1 mA per toggling input enable energy-efficient operation in burst-mode systems. |
Applications
| High-Speed Bus Bridging | Digital Video Interface Buffering |
|---|---|
|
Use Scenario: Interfacing a 67-MHz PCI Express endpoint with a 40-MHz legacy peripheral bus. IC Role / Device Role / Timing Role: Asynchronous clock domain crossing FIFO that absorbs timing skew and prevents data loss during bursts. Use Value: Eliminates need for complex handshake protocols or PLL-based clock alignment, reducing BOM count and layout complexity. |
Use Scenario: Buffering uncompressed 1080p60 RGB video data between HDMI receiver and FPGA-based scaler. IC Role / Device Role / Timing Role: 512 × 18 FIFO absorbing pixel clock jitter and frame-rate mismatches between source and processing pipeline. Use Value: Maintains deterministic latency (≤12 ns access + clock-to-output delay) and prevents visible tearing or stutter in real-time display output. |
| Industrial Serial Protocol Translation | Test Equipment Data Capture |
|
Use Scenario: Converting RS-485 Modbus RTU packets into parallel data for microcontroller DMA ingestion. IC Role / Device Role / Timing Role: Clock-domain isolator between UART-derived bit-clock domain and MCU system clock domain. Use Value: Enables reliable packet assembly without CPU intervention via IR/OR handshaking and HF/AF-AE interrupt generation. |
Use Scenario: Capturing high-speed digital stimulus-response waveforms in automated test equipment at 50+ MHz sampling rates. IC Role / Device Role / Timing Role: First-stage acquisition buffer decoupling ADC sampling clock from slower host processor readout clock. Use Value: Supports sustained capture depth of >9K samples with no dropped data, leveraging full 512-word depth and fast 67-MHz write capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT7805-15DL | Same 512 × 18 architecture and pinout, but lacks programmable AF/AE; uses fixed 64-word almost-full/empty thresholds. | Suitable where simplified status signaling suffices and design reuse of existing 7805 footprint is prioritized. | Select SN74ACT7805-15DL only if AF/AE programmability is unnecessary and cost reduction is critical. |
| SN74ACT7813-15DL | Identical functionality and pinout; differs only in manufacturer marking and minor process revision-fully interoperable per TI documentation. | No functional difference; used interchangeably in production for supply chain flexibility or lot traceability requirements. | SN74ACT7813-15DL is a direct second-source option with identical electrical and timing behavior. |
Compared with SN74ACT7805-15DL, the SN74ACT7803-15DL provides field-programmable AF/AE thresholds for adaptive flow control, while SN74ACT7813-15DL offers identical performance with alternate part-number tracking for procurement diversification.
Availability
SN74ACT7803-15DL is available at Aetrix Electronics and suitable for high-speed bus bridging, digital video interface buffering, and industrial serial protocol translation requiring stable component supply and long-term industrial temperature support.
Supply support for SN74ACT7803-15DL 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 decades of expertise in high-reliability timing and interface ICs.
The SN74ACT7803-15DL belongs to TI's Widebus™ family of advanced CMOS FIFOs, designed specifically for robust asynchronous data buffering in mixed-clock-domain digital systems demanding low latency and deterministic timing.
FAQ
What is the maximum operating frequency of the SN74ACT7803-15DL?
The SN74ACT7803-15DL supports a maximum clock frequency of 67 MHz for both read and write operations, as specified in the timing requirements table for the -15 speed grade. This rating assumes proper termination, 50-pF load, and operation within recommended supply (4.5 V to 5.5 V) and temperature (0°C to 70°C) ranges. Exceeding this frequency may result in setup/hold violations or metastability in status flags.
How does the programmable AF/AE flag work on the SN74ACT7803-15DL?
The SN74ACT7803-15DL allows programming of separate almost-empty (X) and almost-full (Y) thresholds via D0–D7 during reset using the PEN pin. After reset and before the first write, a low PEN pulse latches D0–D7 as X; a second pulse reprograms Y. Default values are X = Y = 64. The AF/AE flag goes high when FIFO depth ≤ X or ≥ (512 − Y), enabling customizable flow-control interrupt generation.
Is the SN74ACT7803-15DL pin-compatible with other members of the ACT78xx FIFO family?
Yes, the SN74ACT7803-15DL is pin-to-pin compatible with SN74ACT7805-15DL and SN74ACT7813-15DL per TI's datasheet. All three share identical 56-pin DL (SSOP) package, pin assignments, and core timing behavior. Functional differences exist only in AF/AE programmability (7803 supports it; 7805 does not), while 7813 is a functionally identical second-source variant.
What is the purpose of the OEC™ circuit in the SN74ACT7803-15DL?
The Output Edge Control (OEC™) circuit in the SN74ACT7803-15DL is a Texas Instruments patented feature that actively controls output slew rate to suppress simultaneous switching noise (SSN). By damping transient current spikes across all 18 Q outputs during transitions, OEC™ improves signal integrity, reduces EMI, and minimizes ground bounce-critical in dense PCB layouts with multiple high-speed data lines.
Can two SN74ACT7803-15DL devices be configured for bidirectional data flow?
Yes, the SN74ACT7803-15DL supports bidirectional configuration without additional logic. One device handles transmit (D→Q) while the other handles receive (Q→D), with shared clocks and coordinated IR/OR handshaking. TI's application diagram (Figure 9) shows direct interconnection of D/Q buses and control lines, enabling full-duplex buffering in protocols like SPI master-slave or dual-port memory emulation.
SN74ACT7803-15DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Size:
- 9K (512 x 18)
- Function:
- Synchronous
- Data Rate:
- 67MHz
- Access Time:
- 12ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 400µA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74ACT7803-15DL FAQ
1.How can I place an order for SN74ACT7803-15DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT7803-15DL 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 SN74ACT7803-15DL reliable?
The price and inventory of SN74ACT7803-15DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT7803-15DL is usually 5 days.
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SN74ACT7803-15DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT7803-15DL 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 SN74ACT7803-15DL?
For technical support, including SN74ACT7803-15DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT7803-15DL requirements.
6.How does Aetrix verify that SN74ACT7803-15DL is sourced from the original manufacturer or authorized distributors?
All SN74ACT7803-15DL 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 SN74ACT7803-15DL meets industry standards.
7.What is the process for return or replacement of SN74ACT7803-15DL?
All SN74ACT7803-15DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT7803-15DL, 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 SN74ACT7803-15DL part is unused and in its original packaging.
Return procedure for SN74ACT7803-15DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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