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Texas Instruments 74AC16245DLG4
- Part No.:
- 74AC16245DLG4
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74AC16245DLG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,258
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Product details
Overview
74AC16245DLG4 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial control and memory interface systems. It operates from 3 V to 5.5 V, delivers ±24 mA output drive at 5 V, supports –40°C to 85°C temperature range, and features flow-through pinout architecture for optimized PCB layout.
For engineers reviewing the 74AC16245DLG4 datasheet, 74AC16245DLG4 pinout, 74AC16245DLG4 application, or 74AC16245DLG4 equivalent, this page provides verified technical context, real-world timing behavior (tPLH/tPHL ≤ 7.9 ns at 5 V), package-specific thermal limits (1.2 W max in DL package), and validated alternatives for bus isolation and level-shifting use cases.
Technical Context
The 74AC16245DLG4 implements two independent 8-bit transceiver sections, each controlled by dedicated DIR (direction) and OE (output enable) inputs. Direction control determines data flow path-A-to-B when DIR = HIGH, B-to-A when DIR = LOW-while OE asserts high-impedance state on both ports when HIGH.
Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process enables fast switching (tPZL ≤ 10.7 ns at 5 V), low input/output capacitance (Ci = 4.5 pF, Co = 16 pF), and robust latch-up immunity (500 mA typical at 125°C). Distributed VCC/GND pins minimize simultaneous switching noise in high-density bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 5.5 V - Supports mixed-voltage system interfacing and legacy 5-V logic compatibility. |
| Output Drive Current | ±24 mA at VCC = 5 V - Sufficient to drive 50-pF loads across 16 lines without external buffering. |
| Propagation Delay | tPLH/tPHL ≤ 7.9 ns at VCC = 5 V - Enables reliable operation in sub-100-MHz synchronous bus environments. |
| 3-State Enable/Disable Time | tPZH ≤ 8.6 ns, tPZL ≤ 10.7 ns at VCC = 5 V - Ensures clean bus arbitration with minimal contention window. |
| Input/Output Capacitance | Ci = 4.5 pF, Co = 16 pF - Reduces capacitive loading on upstream drivers and downstream receivers. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded systems and programmable logic controllers. |
| Power Dissipation (DL pkg) | 1.2 W maximum at TA = 55°C - Dictates thermal pad design and airflow requirements for dense board layouts. |
Pinout & Package
74AC16245DLG4 is housed in a 48-pin shrink small-outline package (SSOP-DL), 380-mil body width, 25-mil pin pitch, with exposed thermal pad not electrically connected. Pin numbering follows standard DL top-view orientation with Pin 1 in Q1 quadrant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24, 25, 48 | VCC | Distributed power supply pins reduce IR drop and high-frequency noise coupling across 16-bit bus. |
| 12, 23, 35, 46 | GND | Distributed ground returns improve signal integrity and minimize ground bounce during parallel switching. |
| 1DIR, 2DIR | Direction Control Input | Active-HIGH logic selects A→B (DIR=H) or B→A (DIR=L); asynchronous, no setup/hold required. |
| 1OE, 2OE | Output Enable Input | Active-LOW logic disables both A and B ports into high-impedance state; enables bus isolation. |
| 1A1–1A8, 2A1–2A8 | Port A I/O | First and second octal data terminals on A side; bidirectional with direction set per section. |
| 1B1–1B8, 2B1–2B8 | Port B I/O | First and second octal data terminals on B side; electrically identical to A-side ports. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins aligned on opposite sides of package - eliminates layer jumps and reduces trace length in bus routing. |
| Distributed VCC/GND | Four VCC and four GND pins placed at strategic intervals - lowers impedance of power delivery network and suppresses simultaneous switching noise. |
| EPIC CMOS process | 1-µm fabrication with 500-mA latch-up immunity - ensures reliability in noisy industrial environments without external current limiting. |
| 3-state output control | Independent OE per 8-bit section - allows selective isolation of half-bus segments during partial updates or fault containment. |
| Wide supply range | 3 V to 5.5 V operation - supports direct interface with 3.3-V microcontrollers and 5-V legacy peripherals without level shifters. |
Applications
| Industrial PLC Backplane Interface | Memory Address Register Buffering |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU and I/O expansion modules over a 16-bit parallel backplane bus. IC Role / Device Role / Timing Role: Bus transceiver isolating CPU address/data lines from modular I/O cards while enabling hot-swap-safe 3-state control. Use Value: Flow-through pinout minimizes trace skew across 16 lines; tPLH ≤ 7.9 ns ensures timing margin for 20-MHz bus cycles. |
Use Scenario: Driving multiplexed address lines from a microcontroller to multiple SRAM or flash devices sharing common address space. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state outputs enabling dynamic address bus partitioning between memory banks. Use Value: ±24 mA drive strength sustains signal integrity across 10+ cm traces; distributed GND pins suppress address glitching during bank switching. |
| Legacy ISA Bus Extension | Test Equipment Digital Pattern Generator |
|
Use Scenario: Interfacing modern FPGA-based controllers to vintage ISA peripheral cards requiring 5-V tolerant, bidirectional data paths. IC Role / Device Role / Timing Role: Level-translation-capable transceiver providing direction-controlled data flow and bus contention avoidance via OE. Use Value: 5.5-V absolute max rating protects against ISA bus overshoot; –40°C to 85°C rating matches industrial PC environmental specs. |
Use Scenario: Generating synchronized 16-bit stimulus patterns to DUTs in automated test systems with precise timing control. IC Role / Device Role / Timing Role: Output driver with deterministic tPZH/tPLZ (≤ 10.7 ns) enabling sub-10-ns edge placement accuracy. Use Value: Low Co = 16 pF prevents pattern distortion on long coaxial cables; independent OE per octant allows segmented pattern masking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC16245DGGR | Same AC logic family, identical electrical specs, but in 48-pin TSSOP (DGG) package with 0.5-mm pitch and smaller footprint (6.1 × 12.5 mm vs DL's 9.9 × 15.4 mm). | Preferred for space-constrained designs where thermal dissipation < 0.85 W is acceptable; requires rework of land pattern and stencil. | Select SN74AC16245DGGR when board area is critical and lower power density is acceptable. |
| 74LVC16245APAG | Lower voltage operation (1.65–3.6 V), higher speed (tPD ≤ 5.5 ns at 3.3 V), but only rated to 125°C ambient and lacks 5-V tolerance. | Suitable for 3.3-V-only systems like portable instrumentation; incompatible with 5-V buses or mixed-supply backplanes. | Choose 74LVC16245APAG only in fully 3.3-V domains where 5-V interoperability is unnecessary. |
Compared with SN74AC16245DGGR, the 74AC16245DLG4 offers higher thermal capacity (1.2 W vs 0.85 W) and proven 5-V robustness; versus 74LVC16245APAG, it retains full 5-V logic compatibility and industrial temperature margin at the cost of slightly higher propagation delay.
Availability
74AC16245DLG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory address buffering, legacy ISA extension, and digital test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for 74AC16245DLG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74AC16245DLG4 belongs to TI's Widebus™ family of high-speed bus interface ICs, engineered specifically for noise-immune, high-density parallel data transfer in programmable logic and control systems.
FAQ
What is the maximum operating voltage for the 74AC16245DLG4?
The 74AC16245DLG4 has an absolute maximum supply voltage of 7 V, but its recommended operating range is 3 V to 5.5 V. Operation above 5.5 V risks exceeding specified timing and drive characteristics, and is not supported per TI's SCAS235A datasheet. The 74AC16245DLG4 must be powered within this 3–5.5 V window for guaranteed functionality and reliability across its –40°C to 85°C temperature range.
Does the 74AC16245DLG4 support hot-swapping or live insertion?
The 74AC16245DLG4 is not explicitly qualified for hot-swap operation, but its 500-mA latch-up immunity at 125°C and robust 3-state control make it tolerant of controlled insertion under power when OE is held HIGH during connection. However, TI does not guarantee glitch-free behavior during live insertion without external current-limiting or sequencing circuitry, and the 74AC16245DLG4 should be enabled only after stable VCC and signal settling per application note SCBA051.
How many independent transceiver sections does the 74AC16245DLG4 contain?
The 74AC16245DLG4 contains two independent 8-bit transceiver sections - labeled Section 1 (pins 1A1–1A8 / 1B1–1B8 / 1DIR / 1OE) and Section 2 (pins 2A1–2A8 / 2B1–2B8 / 2DIR / 2OE). Each section has separate direction and output-enable controls, allowing asymmetric data flow - for example, A→B on Section 1 while B→A on Section 2 - without internal crosstalk.
What is the thermal performance limit of the 74AC16245DLG4 in its DL package?
In the DL (shrink small-outline) package, the 74AC16245DLG4 has a maximum power dissipation of 1.2 W at TA = 55°C in still air, based on TI's SCAS235A datasheet. This corresponds to a junction-to-air thermal resistance (θJA) of approximately 104°C/W. To maintain reliability, board layout must include adequate copper pour on inner layers and avoid enclosing the 74AC16245DLG4 in thermally isolated zones.
Can the 74AC16245DLG4 be used for level translation between 3.3-V and 5-V logic domains?
Yes - the 74AC16245DLG4 accepts 3.3-V inputs safely (VIL = 1.35 V max at VCC = 4.5 V) and drives 5-V-tolerant loads with VOH ≥ 4.94 V at IOH = –24 mA when VCC = 5.5 V. Its wide 3–5.5 V supply range and 5-V-compatible I/O make the 74AC16245DLG4 suitable for unidirectional or bidirectional level shifting, provided direction control and OE sequencing prevent bus contention.
74AC16245DLG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
74AC16245DLG4 FAQ
1.How can I place an order for 74AC16245DLG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC16245DLG4 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 74AC16245DLG4 reliable?
The price and inventory of 74AC16245DLG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16245DLG4 is usually 5 days.
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74AC16245DLG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC16245DLG4 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 74AC16245DLG4?
For technical support, including 74AC16245DLG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16245DLG4 requirements.
6.How does Aetrix verify that 74AC16245DLG4 is sourced from the original manufacturer or authorized distributors?
All 74AC16245DLG4 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 74AC16245DLG4 meets industry standards.
7.What is the process for return or replacement of 74AC16245DLG4?
All 74AC16245DLG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16245DLG4, 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 74AC16245DLG4 part is unused and in its original packaging.
Return procedure for 74AC16245DLG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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