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Texas Instruments SN74ABT7819A-15PN
- Part No.:
- SN74ABT7819A-15PN
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 80-LQFP
- Datasheet:
-
SN74ABT7819A-15PN.pdf
- Description:
- IC FIFO SYNC 512X18X2 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,009
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Product details
Overview
SN74ABT7819A-15PN from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 512 × 18 dual-port SRAM buffers operating in opposite directions, 9 ns access time at 50-pF load, 100 MHz max clock frequency, and programmable almost-full/almost-empty flags. It enables asynchronous data bridging between microprocessor buses with independent CLKA/CLKB clocks.
For engineers reviewing the SN74ABT7819A-15PN datasheet, SN74ABT7819A-15PN pinout, SN74ABT7819A-15PN application, or SN74ABT7819A-15PN equivalent, key selection factors include dual-clock synchronization, 18-bit bidirectional port timing, flag programmability (AF/AEA/AF/AEB), thermal performance (θJA = 62°C/W), and compatibility with 5-V TTL-level systems requiring deterministic latency control.
Technical Context
The SN74ABT7819A-15PN implements two physically separate 512-word × 18-bit FIFOs (FIFOA–B and FIFOB–A) sharing no internal memory space, each with fully independent clock domains (CLKA and CLKB), reset paths (RSTA/RSTB), and flag logic. All data transfers are edge-triggered on low-to-high clock transitions with enable gating via WENA/RENA/WENB/RENB.
Flag signals (IRA/ORA/IRB/ORB, AF/AEA/AF/AEB, HFA/HFB) are two-stage synchronized to their respective port clocks for metastability immunity. Programmable AF/AE offsets are latched from A0–A7/B0–B7 during dedicated CLKA/CLKB cycles under PENA/PENB control, supporting custom depth thresholds without firmware intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width × Ports | 512 × 18 × 2 - Two independent FIFOs, each storing 512 words of 18-bit data, enabling full-duplex buffering across isolated clock domains. |
| Max Clock Frequency | 67 MHz - Guaranteed operation up to 67 MHz for CLKA and CLKB simultaneously, supporting high-throughput interconnects in telecom and datacom systems. |
| Access Time | 9 ns - Propagation delay from clock edge to valid output data (A0–A17/B0–B17) under 50-pF load, ensuring tight timing margins in synchronous designs. |
| Supply Voltage | 4.5 V to 5.5 V - Operates within standard 5-V TTL rail tolerance, compatible with legacy bus interfaces and industrial power supplies. |
| Operating Temperature | 0°C to 70°C - Commercial-grade thermal range suitable for embedded computing, test equipment, and industrial controllers. |
| Package Thermal Impedance | 62°C/W - Measured θJA for PN package enables reliable thermal management in dense PCB layouts without forced air cooling. |
Pinout & Package
SN74ABT7819A-15PN uses 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 with dual 18-bit I/O banks (A0–A17, B0–B17), independent clock/enable/reset/control terminals, and dedicated flag outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Port-A bidirectional data bus | 18-bit I/O path for FIFOA–B; high-impedance when CSA or W/RA is high; active drive during read/write under CLKA-synchronized enable conditions. |
| B0–B17 | Port-B bidirectional data bus | 18-bit I/O path for FIFOB–A; high-impedance when CSB or W/RB is high; driven only when CLKB, CSB, W/RB, and RENB/WENB align per function table. |
| CLKA / CLKB | Free-running port clocks | Asynchronous or coincident continuous clocks; all port-A transfers synchronized to CLKA↑, all port-B transfers to CLKB↑; no phase relationship required between clocks. |
| CSA / CSB | Port chip select | Active-low enables for port-A and port-B; disables data bus drivers and blocks clock-gated transfers when deasserted. |
| W/RA / W/RB | Port write/read direction select | High = write mode (data flows into FIFO), Low = read mode (data flows out); controls A0–A17/B0–B17 driver direction and enables corresponding WENA/WENB or RENA/RENB paths. |
| RSTA / RSTB | Independent FIFO reset | Asynchronous active-low reset requiring four CLKA+CLKB edges to complete; resets pointers, flags (HFA/HFB low, AF/AEA/AF/AEB high), and internal state without affecting other FIFO. |
| AF/AEA / AF/AEB | Programmable almost-full/almost-empty flags | Open-drain outputs indicating FIFOA–B or FIFOB–A occupancy relative to user-defined X/Y thresholds; default 128-word offset unless reprogrammed via PENA/PENB sequence. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Enables true asynchronous data transfer between mismatched bus speeds (e.g., 66-MHz PCI ↔ 40-MHz DSP) without glue logic or clock domain crossing FIFOs. |
| Programmable AF/AE flag offsets | Allows runtime configuration of almost-full/almost-empty thresholds (X/Y = 0–255) via A0–A7/B0–B7 pins during reset, eliminating fixed-threshold design constraints. |
| Two-stage synchronized flags | IRA/ORA/IRB/ORB and AF/HF flags are double-synchronized to CLKA/CLKB, providing glitch-free, metastability-hardened handshaking for real-time control loops. |
| BiCMOS process technology | Combines bipolar speed and CMOS low static power, achieving 9 ns access with <100 mA ICC (max) at 5.5 V, critical for thermally constrained applications. |
| 80-pin PN package | Thin QFP with 62°C/W thermal resistance supports higher sustained data rates than PH variant in space-constrained industrial modules. |
Applications
| PCI-to-Processor Bridge | DSP Data Acquisition Interface |
|---|---|
Use Scenario: Bridging a 33/66-MHz PCI bus to a 40-MHz microcontroller with burst transfers and variable payload sizes. IC Role / Device Role / Timing Role: SN74ABT7819A-15PN acts as a dual-clock FIFO buffer, absorbing clock domain skew and preventing bus lockups during back-to-back writes/reads. Use Value: Eliminates need for complex arbitration logic; 512-word depth absorbs worst-case PCI burst while maintaining deterministic latency under 14 ns flag-to-data propagation. | Use Scenario: Streaming real-time sensor data from ADCs to a TI C6000 DSP with jitter-sensitive DMA channels. IC Role / Device Role / Timing Role: SN74ABT7819A-15PN decouples ADC sampling clock (CLKB) from DSP memory bus clock (CLKA), using ORB/IRA flags for zero-wait-state handshaking. Use Value: Prevents data loss during DSP cache misses; programmable AF/AEB allows tuning empty threshold to match DMA fetch latency, reducing interrupt overhead by 35%. |
| Telecom Line Card Buffering | Industrial PLC Communication Gateway |
Use Scenario: Aggregating T1/E1 frame data from multiple ports into a shared backplane bus with varying slot timing. IC Role / Device Role / Timing Role: SN74ABT7819A-15PN provides independent FIFOs per line interface, each clocked by its own line timing reference (CLKB) and read out by backplane controller (CLKA). Use Value: Enables simultaneous ingress/egress on same physical link; HFB/AF/AEB flags trigger hardware flow control before buffer overflow, meeting GR-474 jitter compliance. | Use Scenario: Isolating Modbus RTU serial interface (asynchronous) from deterministic EtherCAT master clock domain in factory automation. IC Role / Device Role / Timing Role: SN74ABT7819A-15PN serves as a protocol-agnostic data pipe, with CLKA driven by EtherCAT cycle timer and CLKB gated by UART receiver clock. Use Value: Guarantees no frame corruption during network resynchronization; RSTA/RSTB allow per-port reset without halting entire gateway, improving MTBF by >2000 hrs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72V251L15PF | 3.3-V supply only; 512 × 18 depth; 15 ns access; LVCMOS I/O; no programmable AF/AE offsets | Requires level-shifting for 5-V systems; lacks runtime flag threshold adjustment; optimized for low-voltage portable gear | Select when migrating to 3.3-V infrastructure and flag flexibility is not required. |
| SN74ACT7819A-15PN | Same pinout and function but ACT logic family; 4.5–5.5 V supply; 12 ns access; higher drive strength (±24 mA) | Slightly slower timing margin; improved noise immunity; identical thermal profile and flag behavior | Choose for legacy ACT-system compatibility where 3-ns timing slack is acceptable. |
Compared with IDT72V251L15PF and SN74ACT7819A-15PN, the SN74ABT7819A-15PN delivers superior timing headroom (9 ns vs. 12/15 ns), native 5-V TTL compatibility without translation, and unique programmable AF/AE thresholds-critical for adaptive flow control in mixed-speed industrial networks.
Availability
SN74ABT7819A-15PN is available at Aetrix Electronics and suitable for PCI bridging, DSP data acquisition, telecom line card buffering, and industrial PLC communication gateways requiring stable component supply across multi-year production cycles.
Supply support for SN74ABT7819A-15PN 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 timing and interface ICs.
The SN74ABT7819A-15PN belongs to TI's Widebus™ family of high-speed bus-interface devices, engineered specifically for deterministic, low-latency data buffering between asynchronous digital subsystems in communications and industrial control.
FAQ
What is the maximum guaranteed clock frequency for SN74ABT7819A-15PN?
The SN74ABT7819A-15PN is rated for a maximum clock frequency of 67 MHz for both CLKA and CLKB under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating corresponds to the -15 speed grade and is verified with 50-pF load and specified setup/hold timing margins. Operation beyond 67 MHz is not guaranteed and may violate tsu/th constraints.
How do the programmable AF/AEA and AF/AEB flags work on SN74ABT7819A-15PN?
The SN74ABT7819A-15PN supports programmable almost-full/almost-empty thresholds via PENA and PENB inputs. After resetting FIFOA–B, asserting PENA low during CLKA low latches A0–A7 as the X (almost-empty) and Y (almost-full) offsets on the next CLKA↑. Similarly, PENB and B0–B7 program FIFOB–A. Default values are X = Y = 128 if PENA/PENB remain high. The SN74ABT7819A-15PN flag asserts high when FIFO depth ≤ X or ≥ (512 − Y).
Can SN74ABT7819A-15PN operate with CLKA and CLKB running at different frequencies?
Yes, the SN74ABT7819A-15PN explicitly supports asynchronous clock domains: CLKA and CLKB may run at different frequencies, phases, or even be stopped independently. Each FIFO's control logic (pointers, flags, data registers) is clocked exclusively by its assigned port clock, with no internal synchronization between domains. This allows seamless interfacing between, for example, a 50-MHz Ethernet MAC and a 33-MHz PCI host-exactly as designed into the SN74ABT7819A-15PN architecture.
What is the thermal resistance (θJA) of the SN74ABT7819A-15PN package?
SN74ABT7819A-15PN uses an 80-pin Thin Plastic Quad Flatpack (PN) package with a measured junction-to-ambient thermal resistance (θJA) of 62°C/W, per JESD 51–7 methodology. This value assumes standard JEDEC 2-layer board conditions and enables reliable operation up to 70°C ambient at full 100-MHz data rate with typical power dissipation (~95 mA ICC max at VCC = 5.5 V). The PN variant offers 10°C/W lower θJA than the PH package.
Does SN74ABT7819A-15PN require external pull-up resistors on its flag outputs?
Yes, SN74ABT7819A-15PN's AF/AEA, AF/AEB, HFA, HFB, IRA, ORA, IRB, and ORB outputs are open-drain and require external pull-up resistors to VCC (typically 4.7 kΩ) for proper logic-level assertion. This design allows wired-OR flag aggregation and voltage-level translation. The SN74ABT7819A-15PN datasheet specifies VO = 5.5 V max on outputs, confirming compatibility with standard 5-V pull-ups without damage.
SN74ABT7819A-15PN 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:
- 67MHz
- Access Time:
- 10ns
- 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-15PN FAQ
1.How can I place an order for SN74ABT7819A-15PN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT7819A-15PN 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-15PN reliable?
The price and inventory of SN74ABT7819A-15PN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT7819A-15PN is usually 5 days.
3.What payment methods are accepted for SN74ABT7819A-15PN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT7819A-15PN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT7819A-15PN?
SN74ABT7819A-15PN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT7819A-15PN 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-15PN?
For technical support, including SN74ABT7819A-15PN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT7819A-15PN requirements.
6.How does Aetrix verify that SN74ABT7819A-15PN is sourced from the original manufacturer or authorized distributors?
All SN74ABT7819A-15PN 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-15PN meets industry standards.
7.What is the process for return or replacement of SN74ABT7819A-15PN?
All SN74ABT7819A-15PN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT7819A-15PN, 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-15PN part is unused and in its original packaging.
Return procedure for SN74ABT7819A-15PN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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