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Texas Instruments SN74ABT7819A-10PN
- Part No.:
- SN74ABT7819A-10PN
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 80-LQFP
- Datasheet:
-
SN74ABT7819A-10PN.pdf
- Description:
- IC FIFO SYNC 512X18X2 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,647
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Product details
Overview
SN74ABT7819A-10PN from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 512 × 18 dual-port SRAM buffers, 100 MHz maximum clock frequency, 9 ns access time at 50-pF load, and programmable almost-full/empty flags. It enables asynchronous data bridging between microprocessor buses operating on independent clocks CLKA and CLKB.
For engineers reviewing the SN74ABT7819A-10PN datasheet, SN74ABT7819A-10PN pinout, SN74ABT7819A-10PN application, or SN74ABT7819A-10PN equivalent, this device serves as a high-speed, low-power BiCMOS solution for clock domain crossing, protocol translation, and burst-mode buffering in telecom backplanes and industrial controllers.
Technical Context
The SN74ABT7819A-10PN implements two physically separate 512-word × 18-bit FIFOs (FIFOA–B and FIFOB–A), each with fully synchronous, clock-gated read/write paths. CLKA controls all port-A operations (IRA, ORA, HFA, AF/AEA), while CLKB governs port-B functions (IRB, ORB, HFB, AF/AEB).
Flag signals are two-stage synchronized to their respective clocks for metastability immunity; reset requires four clock transitions on both CLKA and CLKB; programmable AF/AE offsets (X/Y) are latched from A0–A7/B0–B7 during dedicated PENA/PENB cycles before first write.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width × Ports | 512 × 18 × 2 - Two independent FIFOs support full-duplex buffering with no shared address/data arbitration logic. |
| Max Clock Frequency | 100 MHz - Enables sustained 1.8 Gbps aggregate throughput (18 bits × 100 MHz × 2 ports) in high-bandwidth interconnects. |
| Access Time | 9 ns @ 50 pF - Guarantees sub-10 ns data valid-to-clock setup for tight timing closure in 100 MHz systems. |
| Programmable Flags | AF/AEA & AF/AEB with X/Y offsets - Allows custom almost-full/almost-empty thresholds (e.g., 32/480 words) to optimize buffer utilization and prevent overflow/underflow. |
| Supply Voltage Range | 4.5 V to 5.5 V - Compatible with standard 5-V TTL/ABT logic families and supports margin testing across rail tolerance. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded systems including network switches and PLC I/O modules. |
| Technology | Advanced BiCMOS - Delivers TTL-compatible drive strength (24 mA sink / –12 mA source) with CMOS-level static power efficiency. |
Pinout & Package
SN74ABT7819A-10PN is housed in an 80-pin Thin Plastic Quad Flatpack (PN) package with 0.5-mm lead pitch and exposed thermal pad. Pin numbering follows TI's standard top-view layout for PN packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Port-A bidirectional data bus | 18-bit parallel interface active only when CSA = L and W/RA = L (read) or H (write); high-impedance otherwise. |
| B0–B17 | Port-B bidirectional data bus | 18-bit parallel interface active only when CSB = L and W/RB = L (read) or H (write); high-impedance otherwise. |
| CLKA, CLKB | Free-running input clocks | Independent, asynchronous or coincident clocks; all port-A transfers synchronized to CLKA↑, all port-B to CLKB↑. |
| CSA, CSB | Chip select inputs | Enable port-A/B operation; must be low to assert W/RA/W/RB control and enable data bus drivers. |
| W/RA, W/RB | Port-A/B write/read direction select | High = write mode (data flows into FIFO), low = read mode (data flows out of FIFO); controls A0–A17/B0–B17 driver state. |
| WENA, WENB | Write enable inputs | High enables write on next CLKA↑/CLKB↑ when IRA/IRB = H; prevents writes when FIFO is full. |
| RENA, RENB | Read enable inputs | High enables read on next CLKA↑/CLKB↑ when ORA/ORB = H; prevents reads when FIFO is empty. |
| IRA, IRB | Input-ready flags | Synchronized to CLKA/CLKB; low indicates corresponding FIFO is full and write requests will be ignored. |
| ORA, ORB | Output-ready flags | Synchronized to CLKA/CLKB; high indicates valid data is present on A0–A17/B0–B17 outputs. |
| AF/AEA, AF/AEB | Programmable almost-full/empty flags | Assert high when FIFO depth ≤ X (almost empty) or ≥ (512 − Y) (almost full); offsets set via PENA/PENB + A0–A7/B0–B7. |
| HFA, HFB | Half-full flags | High when FIFO contains ≥ 256 words; provides coarse buffer occupancy indication without programming overhead. |
| RSTA, RSTB | FIFO reset inputs | Active-low; requires four CLKA+CLKB transitions to clear pointers, flags, and internal state for FIFOA–B/FIFOB–A respectively. |
| PENA, PENB | AF/AE offset programming enable | Low during CLKA↑/CLKB↑ latches A0–A7/B0–B7 as X/Y offset values; must be high to use default 128/128. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 512 × 18 FIFOs | Eliminates need for external arbitration logic when bridging two synchronous buses with different clock domains. |
| Programmable almost-full/empty thresholds | Enables application-specific flow control tuning-e.g., setting AF/AEA to trigger DMA reload at 64 words remaining instead of fixed 128. |
| Two-stage synchronized flag outputs | Guarantees glitch-free, metastability-hardened status signaling directly usable by FPGA or ASIC control state machines. |
| 9 ns access time @ 50 pF | Supports 100 MHz operation with margin for PCB trace delays and signal integrity degradation in dense layouts. |
| BiCMOS output drivers | Delivers 24 mA sink current compatible with legacy TTL loads while maintaining low static power (<15 mA ICC disabled). |
Applications
| Telecom Line Card Buffering | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Bridging high-speed serial framers (e.g., T1/E1) to slower system processors in carrier-grade line cards. IC Role / Device Role / Timing Role: Bidirectional FIFO decouples framer clock domain (1.544/2.048 MHz) from processor bus clock (e.g., 33 MHz PCI), absorbing jitter and burst latency. Use Value: Prevents data loss during clock skew or processor interrupt latency using programmable AF/AEA to trigger early DMA fetch before FIFO underflow. | Use Scenario: Interfacing real-time I/O modules to centralized controller CPUs across isolated backplane segments. IC Role / Device Role / Timing Role: Synchronizes deterministic sensor acquisition (on 10 MHz RTOS timer) with non-deterministic host polling (on 25 MHz system bus). Use Value: Ensures zero-drop data transfer despite variable host response time, using HFA flag to throttle I/O module sampling rate when buffer reaches 256 words. |
| Network Switch Fabric Interface | Test Equipment Data Capture |
Use Scenario: Connecting packet classifier ASICs to traffic manager units in multi-gigabit Ethernet switches. IC Role / Device Role / Timing Role: Absorbs bursty packet arrival rates (e.g., 10 Gbps line rate) into steady 1 Gbps fabric interface clock domain. Use Value: Maintains line-rate throughput by leveraging 100 MHz CLKA/CLKB capability and 9 ns access to minimize queuing delay in cut-through forwarding paths. | Use Scenario: Capturing high-speed digital stimulus-response waveforms in automated test equipment (ATE) with mixed-signal DUTs. IC Role / Device Role / Timing Role: Buffers parallel digital capture data (18-bit wide) from 100 MHz sampling clock into slower analysis subsystem running at 50 MHz. Use Value: Enables continuous streaming without gaps using RSTA/RSTB to reinitialize FIFOs between test sequences while preserving timing alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72V2115L10PF | 3.3-V supply only; 512 × 18 × 2 configuration; 10 ns access; LVDS-compatible I/O | Requires level-shifting for 5-V systems; optimized for low-noise, high-density routing in telecom PHY layers | Select when migrating to 3.3-V infrastructure or requiring differential signaling robustness against EMI. |
| SN74ACT7819A-10PN | Same pinout and function but ACT logic family; 4.5–5.5 V supply; 10 ns access; higher drive (24 mA) but higher ICC | Compatible drop-in replacement with identical timing and control; slightly higher power consumption | Choose when ABT drive strength is insufficient or when ACT-family noise immunity is preferred in noisy industrial environments. |
Compared with IDT72V2115L10PF and SN74ACT7819A-10PN, the SN74ABT7819A-10PN offers optimal balance of 5-V compatibility, 9 ns speed, and BiCMOS power efficiency-making it ideal for cost-sensitive, mixed-voltage legacy systems where pin-for-pin upgrade paths are constrained.
Availability
SN74ABT7819A-10PN is available at Aetrix Electronics and suitable for telecom line card buffering, industrial PLC backplane interfaces, network switch fabric interconnects, and automated test equipment requiring stable component supply across extended production lifecycles.
Supply support for SN74ABT7819A-10PN 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 components.
The SN74ABT7819A-10PN belongs to TI's Widebus™ family of high-speed interface ICs, engineered specifically for clock-domain bridging, burst-mode buffering, and synchronous data translation in telecom, industrial automation, and test instrumentation.
FAQ
What is the maximum supported clock frequency for SN74ABT7819A-10PN?
The SN74ABT7819A-10PN supports a maximum clock frequency of 100 MHz on both CLKA and CLKB inputs under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating is validated with 50-pF load and accounts for worst-case process/voltage/temperature corners per the SCBS756 datasheet.
How does the programmable almost-full/empty flag (AF/AEA) operate in SN74ABT7819A-10PN?
The AF/AEA flag in SN74ABT7819A-10PN asserts high when FIFOA–B contains ≤ X words (almost-empty) or ≥ (512 − Y) words (almost-full), where X and Y are programmable offsets. These values are latched from A0–A7 during PENA-controlled CLKA transitions after reset; default is X = Y = 128 if PENA remains high.
Can SN74ABT7819A-10PN interface directly with 3.3-V logic systems?
No-SN74ABT7819A-10PN operates strictly at 4.5 V to 5.5 V and is not 3.3-V tolerant. Its inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V, and outputs swing rail-to-rail within the 5-V supply. Direct connection to 3.3-V devices requires level-shifting circuitry or voltage translators to avoid damage or undefined logic states.
What is the function of the RSTA and RSTB pins on SN74ABT7819A-10PN?
RSTA and RSTB are active-low asynchronous reset inputs for FIFOA–B and FIFOB–A respectively. Each requires four low-to-high transitions on both CLKA and CLKB while held low to fully clear pointers, flags (IRA, ORB, HFA, AF/AEA), and internal state-ensuring deterministic initialization before new data transfer sequences.
Does SN74ABT7819A-10PN support simultaneous read and write operations on the same FIFO?
No-each FIFO (FIFOA–B and FIFOB–A) is single-port in operation: port-A accesses only FIFOA–B for write and FIFOB–A for read, while port-B accesses only FIFOB–A for write and FIFOA–B for read. True simultaneous R/W on one memory block is not supported; the architecture enforces strict directional separation per port pair.
SN74ABT7819A-10PN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 80-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 18K (512 x 18 x 2)
- Function:
- Synchronous
- Data Rate:
- 100MHz
- Access Time:
- 8ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 95mA
- Bus Directional:
- Bi-Directional
- Expansion Type:
- -
- 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)
SN74ABT7819A-10PN FAQ
1.How can I place an order for SN74ABT7819A-10PN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT7819A-10PN 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 SN74ABT7819A-10PN reliable?
The price and inventory of SN74ABT7819A-10PN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT7819A-10PN is usually 5 days.
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SN74ABT7819A-10PN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT7819A-10PN 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 SN74ABT7819A-10PN?
For technical support, including SN74ABT7819A-10PN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT7819A-10PN requirements.
6.How does Aetrix verify that SN74ABT7819A-10PN is sourced from the original manufacturer or authorized distributors?
All SN74ABT7819A-10PN 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 SN74ABT7819A-10PN meets industry standards.
7.What is the process for return or replacement of SN74ABT7819A-10PN?
All SN74ABT7819A-10PN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT7819A-10PN, 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 SN74ABT7819A-10PN part is unused and in its original packaging.
Return procedure for SN74ABT7819A-10PN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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