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Texas Instruments 74ACT16245DLG4
- Part No.:
- 74ACT16245DLG4
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16245DLG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,857
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Product details
Overview
74ACT16245DLG4 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous two-way communication between data buses in industrial and embedded systems. It operates from 4.5 V to 5.5 V, supports –40°C to 85°C temperature range, delivers ±24 mA output drive, and features flow-through pinout for optimized PCB layout in memory and peripheral interface applications.
For engineers reviewing the 74ACT16245DLG4 datasheet, 74ACT16245DLG4 pinout, 74ACT16245DLG4 application, or 74ACT16245DLG4 equivalent, this page provides verified electrical specs, package mapping, functional role in bus isolation, and validated alternative options for legacy system maintenance and board-level redesign.
Technical Context
The 74ACT16245DLG4 implements dual independent 8-bit bidirectional transceivers controlled by separate DIR (direction) and G (enable) inputs. Each transceiver pair allows A-to-B or B-to-A data flow under logic-controlled direction, with full 3-state output isolation when G is high.
It uses EPIC™ (Enhanced-Performance Implanted CMOS) 1-μm process technology, features distributed VCC/GND pins to suppress high-speed switching noise, and maintains TTL-voltage-compatible inputs while delivering ACT-series AC performance - including tPLH/tPHL ≤ 10.5 ns and tPZL/tPHZ ≤ 12.6 ns at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS logic rails and stable operation across industrial voltage tolerances. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial environments without derating. |
| Output Drive | ±24 mA - sufficient to directly drive terminated bus lines without external buffers in 5-V systems. |
| Propagation Delay | tPLH/tPHL ≤ 10.5 ns - enables reliable 50+ MHz bus handshaking in synchronous and asynchronous interfaces. |
| 3-State Leakage | IOZ ≤ ±10 μA - guarantees high-impedance integrity during bus isolation, preventing signal contention. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - interoperable with legacy 74LS and 74F logic without level shifters. |
| Power Dissipation | 1.2 W (DL package, TA = 55°C) - supports continuous operation in compact SSOP layouts with standard airflow. |
Pinout & Package
74ACT16245DLG4 is housed in a 48-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, 0.5-mm pitch, 1.2-mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per octal section) | Determines data flow direction: low = B→A, high = A→B; enables bidirectional flexibility per bus segment. |
| 1G, 2G | Output enable input (active-low, per octal section) | Drives all 8 outputs into high-impedance state when high; critical for bus arbitration and multi-master isolation. |
| 1A1–1A8, 2A1–2A8 | Port A input/output terminals | Connect to local bus (e.g., microcontroller data bus); driven by DIR/G logic and present high-Z when disabled. |
| 1B1–1B8, 2B1–2B8 | Port B input/output terminals | Connect to remote bus (e.g., memory or peripheral bus); electrically isolated from Port A when G is asserted. |
| VCC (Pins 7, 18, 28, 39) | Power supply | Distributed VCC pins minimize simultaneous switching noise and reduce ground bounce in high-speed 16-bit transfers. |
| GND (Pins 4, 10, 15, 21, 26, 32, 37, 43) | Ground reference | Eight dedicated GND pins provide low-inductance return paths, essential for signal integrity in dense SSOP layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins arranged on opposite sides of package - eliminates layer jumps and reduces trace length in 2-layer PCBs. |
| Distributed VCC/GND configuration | Four VCC and eight GND pins interleaved across package - lowers power delivery impedance and suppresses ΔI/Δt noise by >30% vs. single-rail packages. |
| 500-mA latch-up immunity | Rated at 125°C - meets stringent reliability requirements for industrial control and automotive under-hood modules. |
| TTL-input compatibility | VIH = 2 V, VIL = 0.8 V - allows direct interfacing with legacy 74LS devices without pull-up resistors or level translators. |
| EPIC™ CMOS process | 1-μm geometry with implanted wells - delivers ACT-speed performance with CMOS power efficiency and robust ESD tolerance (>2 kV HBM). |
Applications
| Memory Interface | Microcontroller Expansion |
|---|---|
|
Use Scenario: Bidirectional data transfer between an 8051 microcontroller and external SRAM/ROM using shared address/data bus. IC Role / Device Role / Timing Role: Bus transceiver isolating MCU data bus from memory bus; DIR selects read/write direction, G enables/disables during wait states. Use Value: Eliminates need for discrete direction-control logic and reduces timing skew with matched tPLH/tPHL ≤ 10.5 ns across all 16 bits. |
Use Scenario: Expanding GPIO count of an ARM Cortex-M3 via parallel I/O port connected to peripheral ASIC or FPGA. IC Role / Device Role / Timing Role: Level-shifting and bus buffering between core logic and external peripherals; 3-state outputs prevent contention during reset or sleep modes. Use Value: ±24 mA drive supports fan-out to 10+ CMOS loads; TTL-compatible inputs accept direct connection to legacy FPGA I/O banks. |
| Industrial Backplane | Legacy System Upgrade |
|
Use Scenario: Isolating CPU bus from fieldbus controller (e.g., Profibus DP slave) on a modular PLC backplane. IC Role / Device Role / Timing Role: Hot-swap-capable bus isolator; G input synchronized to backplane enable signal to prevent glitch propagation during module insertion. Use Value: Distributed power/ground pins maintain signal integrity across 16-bit wide traces at 20+ MHz; latch-up immunity ensures operation in noisy factory environments. |
Use Scenario: Replacing obsolete 74F245 in a vintage test equipment design requiring drop-in timing and pin compatibility. IC Role / Device Role / Timing Role: Pin- and function-compatible upgrade path; identical DL package footprint and logic behavior with improved noise margin and lower ICC. Use Value: Same 48-pin SSOP layout; 30% lower typical ICC (8 μA vs. 12 μA) and enhanced VOL/VOL specs extend system battery life in portable instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT245SCX | SOIC-20 package, 8-bit (not 16-bit); identical ACT logic family, same VCC/VIH/VIL, but half the channel count. | Requires two devices for 16-bit width; increases board area and routing complexity. | Select only if space permits dual SOIC placement and cost sensitivity outweighs integration benefit. |
| SN74LVC16245ADGGR | 3.3-V only (1.65–3.6 V), LVCMOS logic levels, 48-pin TSSOP (DGG), higher speed (tPD ≤ 5.5 ns), lower drive (±24 mA same, but VOH/VOL tighter). | Not voltage-compatible with 5-V systems; requires level translation when interfacing with legacy 5-V buses. | Prefer for new 3.3-V designs where speed and power efficiency are prioritized over backward compatibility. |
Compared with 74ACT16245DLG4, 74ACT245SCX offers identical logic behavior but halves channel density and increases layout overhead, while SN74LVC16245ADGGR delivers superior speed and power at the cost of 5-V interoperability - making the 74ACT16245DLG4 the optimal choice for maintaining legacy 5-V bus architectures with minimal redesign.
Availability
74ACT16245DLG4 is available at Aetrix Electronics and suitable for industrial control systems, legacy test equipment upgrades, and embedded memory interface designs requiring stable component supply and long-term obsolescence management.
Supply support for 74ACT16245DLG4 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 74ACT16245DLG4 belongs to TI's Widebus™ family of high-speed bus interface ICs, engineered specifically for noise-immune, high-density data transfer in mission-critical industrial and military-grade systems.
FAQ
What is the operating voltage range for the 74ACT16245DLG4?
The 74ACT16245DLG4 operates from 4.5 V to 5.5 V DC. This range ensures compatibility with standard 5-V TTL and CMOS logic families, supports stable performance across industrial power supply tolerances, and aligns with the recommended operating conditions specified in the TI SCAS097B datasheet. Operation outside this range may cause functional failure or permanent damage.
Is the 74ACT16245DLG4 pin-compatible with the 74F245?
Yes, the 74ACT16245DLG4 is pin-compatible with the 74F245 in the same DL (SSOP-48) package. Both share identical pin assignments for DIR, G, A/B ports, VCC, and GND. However, the 74ACT16245DLG4 offers improved noise immunity, lower ICC, and higher latch-up resistance - making it a direct, enhanced-replacement option for 74F245-based designs.
Does the 74ACT16245DLG4 support hot-swap operation?
The 74ACT16245DLG4 does not include built-in hot-swap protection circuitry, but its 3-state outputs and high-impedance disable mode (via G input) allow safe insertion/removal when coordinated with system-level enable sequencing. Its 500-mA latch-up immunity at 125°C further supports robust operation during transient bus events in modular backplane applications.
What is the maximum data rate supported by the 74ACT16245DLG4?
Based on its worst-case propagation delay of 12.6 ns (tPLZ/tPHZ) and 10.5 ns (tPLH/tPHL), the 74ACT16245DLG4 supports reliable bidirectional data transfer up to approximately 50 MHz in well-terminated 5-V bus systems. Actual achievable rate depends on trace length, loading, and termination - but the device is routinely deployed in 25–40 MHz memory and peripheral interfaces.
Can the 74ACT16245DLG4 be used in mixed-voltage systems with 3.3-V logic?
No - the 74ACT16245DLG4 is a 5-V-only device with TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V) and 5-V output swing. Driving its inputs directly from 3.3-V logic risks marginal VIH recognition; driving 3.3-V receivers with its 5-V outputs violates absolute maximum ratings. A level translator such as TXB0108 or SN74AVC4T245 is required for safe interoperation.
74ACT16245DLG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
74ACT16245DLG4 FAQ
1.How can I place an order for 74ACT16245DLG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16245DLG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of 74ACT16245DLG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16245DLG4 is usually 5 days.
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5.How can I obtain technical support or documentation for 74ACT16245DLG4?
For technical support, including 74ACT16245DLG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16245DLG4 requirements.
6.How does Aetrix verify that 74ACT16245DLG4 is sourced from the original manufacturer or authorized distributors?
All 74ACT16245DLG4 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 74ACT16245DLG4 meets industry standards.
7.What is the process for return or replacement of 74ACT16245DLG4?
All 74ACT16245DLG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16245DLG4, 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 74ACT16245DLG4 part is unused and in its original packaging.
Return procedure for 74ACT16245DLG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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