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Texas Instruments SN74ABT7819A-30PN
- Part No.:
- SN74ABT7819A-30PN
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 80-LQFP
- Datasheet:
-
SN74ABT7819A-30PN.pdf
- Description:
- IC FIFO SYNC 512X18X2 80LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ABT7819A-30PN from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 512 × 18 dual-port SRAM buffers operating in opposite directions, 33.3 MHz maximum clock frequency, 9 ns access time at 50-pF load, and programmable almost-full/almost-empty flags. It enables asynchronous data bridging between microprocessors or buses with independent CLKA/CLKB clocks.
For engineers reviewing the SN74ABT7819A-30PN datasheet, SN74ABT7819A-30PN pinout, SN74ABT7819A-30PN application, or SN74ABT7819A-30PN equivalent, key selection considerations include dual-clock domain 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 control logic.
Technical Context
The SN74ABT7819A-30PN implements two physically separate 512-word × 18-bit FIFOs (FIFOA–B and FIFOB–A) sharing a single die but operating with fully independent clock domains (CLKA and CLKB), each with dedicated input-ready (IRA/IRB) and output-ready (ORA/ORB) flags synchronized to their respective clocks. Control logic supports microprocessor interface via CSA/CSB, W/RA/W/RB, RENA/RENB, and WENA/WENB with high-impedance output enable.
Flag generation uses two-stage synchronization to eliminate metastability; AF/AEA and AF/AEB offsets are programmable via A0–A7/B0–B7 during reset using PENA/PENB strobes, supporting custom almost-full (Y) and almost-empty (X) thresholds up to 255 words. The device employs advanced BiCMOS technology for low-power, high-speed operation across 0°C to 70°C.
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 for bidirectional buffering. |
| Max Clock Frequency | 33.3 MHz - Maximum supported CLKA/CLKB rate for reliable read/write cycles per timing spec '7819A-30. |
| Access Time | 9 ns - Fast propagation delay (tpd) from clock edge to valid data on A0–A17/B0–B17 outputs under 50-pF load. |
| Supply Voltage | 4.5 V to 5.5 V - Operates within standard 5-V TTL-compatible range; ICC peaks at 15 mA (outputs disabled). |
| Operating Temperature | 0°C to 70°C - Commercial-grade thermal range suitable for industrial control and communications equipment. |
| Thermal Resistance θJA | 62°C/W - Measured for PN package; informs thermal design margin for continuous operation at full speed. |
| Programmable Flags | AF/AEA & AF/AEB - Configurable almost-full/almost-empty thresholds (X/Y = 0–255) via port-A/B data bus during reset. |
Pinout & Package
SN74ABT7819A-30PN 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 as documented in SCBS756.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Port-A bidirectional data bus | 18-bit I/O path for FIFOA–B writes and FIFOB–A reads; high-impedance when CSA or W/RA high. |
| B0–B17 | Port-B bidirectional data bus | 18-bit I/O path for FIFOB–A writes and FIFOA–B reads; high-impedance when CSB or W/RB high. |
| CLKA / CLKB | Free-running synchronous clocks | Independent clock inputs governing all port-A and port-B transfers; support asynchronous or coincident operation. |
| CSA / CSB | Port chip select | Active-low enables for port-A and port-B; required low for any read/write access and output driver activation. |
| W/RA / W/RB | Port write/read direction control | High = write to local FIFO; Low = read from remote FIFO; determines A0–A17/B0–B17 driver state. |
| WENA / WENB | Write enable | Active-high gate for writing data into FIFOA–B (via A0–A17) or FIFOB–A (via B0–B17) on clock rising edge. |
| RENA / RENB | Read enable | Active-high gate for reading data from FIFOB–A (to A0–A17) or FIFOA–B (to B0–B17) on clock rising edge. |
| IRA / IRB | Input-ready flag (output) | Synchronized to CLKA/CLKB; low indicates corresponding FIFO is full and disables further writes. |
| ORA / ORB | Output-ready flag (output) | Synchronized to CLKA/CLKB; high indicates valid data ready for read from remote FIFO. |
| AF/AEA / AF/AEB | Programmable almost-full/empty flag | Indicates FIFOA–B/FIFOB–A contains ≤X or ≥(512−Y) words; offset values set via A0–A7/B0–B7 during reset. |
| HFA / HFB | Half-full flag | Asserts high when FIFOA–B/FIFOB–A contains ≥256 words; fixed threshold, no programming required. |
| RSTA / RSTB | FIFO reset control | Asynchronous active-high reset requiring four clock edges on both CLKA and CLKB to complete. |
| PENA / PENB | AF/AE offset programming enable | Strobe signal enabling latching of A0–A7/B0–B7 values as X/Y offsets during FIFO reset sequence. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Enables seamless data transfer between systems with mismatched or unrelated clock frequencies (e.g., CPU ↔ peripheral bus). |
| Programmable almost-full/empty thresholds | Allows system-level flow control tuning via software-configurable X/Y offsets (0–255), avoiding fixed latency penalties. |
| Two-stage synchronized status flags | Eliminates metastability risk for IRA, IRB, ORA, ORB, AF/AEA, AF/AEB, HFA, and HFB in multi-clock-domain designs. |
| Microprocessor-compatible control interface | Supports standard TTL-level enable, select, and clock signals without external glue logic or level translation. |
| Low-power BiCMOS process | Delivers 33.3-MHz operation with only 15-mA quiescent supply current, reducing thermal load in dense PCB layouts. |
Applications
| Network Packet Buffering | Industrial PLC Data Exchange |
|---|---|
Use Scenario: Bridging Ethernet MAC and application processor with mismatched clock domains and bursty traffic patterns. IC Role / Device Role / Timing Role: Bidirectional FIFO decouples packet ingress/egress timing; CLKA driven by MAC clock, CLKB by processor clock. Use Value: Prevents packet loss during clock domain crossings while maintaining deterministic latency via AF/AEA-triggered DMA requests. |
Use Scenario: Synchronizing real-time I/O scan cycles between a motion controller and fieldbus master (e.g., Profibus DP). IC Role / Device Role / Timing Role: FIFOA–B buffers sensor data from controller; FIFOB–A delivers actuator commands to fieldbus interface. Use Value: Enables jitter-free I/O updates despite variable scan intervals, with HFA flag signaling buffer occupancy to scheduler. |
| Video Frame Rate Conversion | Legacy Bus Interfacing |
Use Scenario: Converting 60-Hz HDMI video stream to 50-Hz display output in broadcast equipment. IC Role / Device Role / Timing Role: Acts as frame-aligned buffer between pixel clock domains; CLKA = 148.5 MHz (HDMI), CLKB = 125 MHz (panel). Use Value: Absorbs timing drift between sources using programmable AF/AEB to trigger adaptive line-doubling logic before overflow. |
Use Scenario: Connecting modern FPGA-based subsystem to legacy ISA or VME bus with incompatible timing and voltage levels. IC Role / Device Role / Timing Role: Provides handshake-free data staging between asynchronous bus masters; W/RA/W/RB emulate bus direction control. Use Value: Eliminates need for discrete latch/counter logic; RSTA/RSTB allow cold-start initialization without external sequencer. |
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 LVCMOS interface, 512 × 18 depth, 15-ns access, different pinout and flag architecture (no AF/AE programmability). | Requires level-shifting for 5-V systems; lacks software-tunable almost-full thresholds, limiting dynamic flow control. | Choose when migrating to 3.3-V infrastructure and flag simplicity is acceptable. |
| SN74ACT7819A-20PN | Same 5-V ABT family, identical pinout and function, but rated for 50-MHz max clock ('7819A-20 speed grade). | Higher timing margin for slower systems; identical thermal profile and flag behavior, drop-in replacement if speed headroom exists. | Choose when design operates below 33.3 MHz and prioritizes proven reliability over marginal speed gain. |
Compared with IDT72V251L15PF and SN74ACT7819A-20PN, the SN74ABT7819A-30PN uniquely combines 5-V TTL compatibility, programmable AF/AE thresholds, and 33.3-MHz operation in a thermally optimized PN package-making it optimal for legacy-system upgrades requiring precise flow control without voltage conversion.
Availability
SN74ABT7819A-30PN is available at Aetrix Electronics and suitable for network packet buffering, industrial PLC data exchange, video frame rate conversion, and legacy bus interfacing requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT7819A-30PN 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 interface and memory products.
The SN74ABT7819A belongs to TI's Widebus™ family of high-speed interface ICs, designed specifically for clock-domain bridging in industrial automation, communications infrastructure, and real-time control systems.
FAQ
What is the maximum clock frequency supported by the SN74ABT7819A-30PN?
The SN74ABT7819A-30PN supports a maximum clock frequency of 33.3 MHz for both CLKA and CLKB inputs, as defined by the '7819A-30 speed grade in the SCBS756 datasheet. This rating assumes operation within recommended conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C) and 50-pF load. Exceeding this frequency may violate setup/hold timing and cause data corruption.
How do the AF/AEA and AF/AEB flags work on the SN74ABT7819A-30PN?
The AF/AEA and AF/AEB flags on the SN74ABT7819A-30PN indicate when FIFOA–B or FIFOB–A contains ≤X (almost-empty) or ≥(512−Y) (almost-full) words. X and Y offsets are programmed via A0–A17/B0–B17 during reset using PENA/PENB strobes. Default values are X = Y = 128, yielding thresholds at 128 and 384 words respectively.
Can the SN74ABT7819A-30PN operate with asynchronous CLKA and CLKB clocks?
Yes, the SN74ABT7819A-30PN explicitly supports asynchronous CLKA and CLKB operation. Its dual-clock architecture allows independent timing domains, with all status flags (IRA, ORA, IRB, ORB, AF/AEA, AF/AEB) synchronized to their respective clocks to prevent metastability. No phase alignment or frequency relationship is required between CLKA and CLKB.
What is the thermal resistance (θJA) of the SN74ABT7819A-30PN package?
The SN74ABT7819A-30PN uses an 80-pin Thin Plastic Quad Flatpack (PN) package with a thermal resistance θJA of 62°C/W, as specified in the absolute maximum ratings table of SCBS756. This value assumes standard JEDEC test board conditions and informs heatsink or airflow requirements for sustained 33.3-MHz operation.
Does the SN74ABT7819A-30PN require external pull-up resistors on its control pins?
No, the SN74ABT7819A-30PN does not require external pull-up resistors on control pins like CSA, CSB, W/RA, W/RB, RENA, RENB, WENA, or WENB. These inputs have TTL-compatible thresholds (VIH = 2 V min, VIL = 0.8 V max) and sufficient internal noise immunity for direct connection to microcontroller GPIO or FPGA outputs driving 0 V / 5 V logic levels.
SN74ABT7819A-30PN 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:
- 33.3MHz
- Access Time:
- 14ns
- 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-30PN FAQ
1.How can I place an order for SN74ABT7819A-30PN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT7819A-30PN 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-30PN reliable?
The price and inventory of SN74ABT7819A-30PN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT7819A-30PN is usually 5 days.
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Once your SN74ABT7819A-30PN 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-30PN?
For technical support, including SN74ABT7819A-30PN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT7819A-30PN requirements.
6.How does Aetrix verify that SN74ABT7819A-30PN is sourced from the original manufacturer or authorized distributors?
All SN74ABT7819A-30PN 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-30PN meets industry standards.
7.What is the process for return or replacement of SN74ABT7819A-30PN?
All SN74ABT7819A-30PN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT7819A-30PN, 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-30PN part is unused and in its original packaging.
Return procedure for SN74ABT7819A-30PN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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