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Texas Instruments 74AC16245DLR
- Part No.:
- 74AC16245DLR
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74AC16245DLR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
74AC16245DLR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous two-way data communication between parallel buses in industrial and embedded systems. It operates from 3 V to 5.5 V, delivers ±24 mA output drive at 5 V, supports bidirectional flow via DIR control, and features isolation capability when OE is high.
For engineers reviewing the 74AC16245DLR datasheet, 74AC16245DLR pinout, 74AC16245DLR application, or 74AC16245DLR equivalent, key selection criteria include its 48-pin SSOP (DL) package, –40°C to 85°C temperature range, 3-state bus isolation timing (tPZL up to 18 ns at 5 V), and compatibility with Widebus™-optimized PCB layouts requiring distributed VCC/GND pins.
Technical Context
The 74AC16245DLR implements dual-octal transceiver logic with independent direction (DIR) and output-enable (OE) controls per octet, enabling simultaneous A→B and B→A data paths under separate control. Its EPIC™ CMOS process ensures latch-up immunity of 500 mA at 125°C and supports high-speed switching with distributed power/ground pins minimizing noise.
It uses flow-through pin architecture-inputs on one side, outputs on the opposite-to simplify trace routing and reduce signal crosstalk. All 48 pins are assigned to I/O, VCC, or GND; no dedicated logic supply or reference pins are present, and unused inputs must be tied high or low per TI's recommended operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - Enables interoperability with 3.3 V and 5 V logic domains without level-shifting circuitry. |
| Output Drive | ±24 mA at VCC = 5 V - Sufficient to drive 50-pF loads across 10–15 cm PCB traces in backplane or motherboard applications. |
| Propagation Delay | tPLH/tPHL = 2–7.9 ns at 5 V - Supports data rates up to ~125 MHz in point-to-point bus configurations. |
| 3-State Enable Time | tPZL = 3–10.7 ns at 5 V - Ensures fast bus release for time-critical arbitration or multiplexed memory access. |
| Input Leakage | ±1 µA max at VCC = 5.5 V - Allows reliable operation with weak pull-ups/pull-downs and reduces static power in standby modes. |
| Power Dissipation | 1.2 W max (DL package, still air) - Requires minimal thermal relief on standard FR-4; no heatsink needed below 100 kHz toggle rate. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded controllers, PLC I/O modules, and test equipment. |
Pinout & Package
74AC16245DLR is housed in a 48-pin Shrink Small-Outline Package (SSOP), designated DL by Texas Instruments, with 0.025-inch (0.635 mm) center-to-center pin pitch and 380-mil body width. The package features exposed thermal pad-less construction and is RoHS-compliant with NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24, 25, 48 | VCC | Distributed power supply pins - placed at corners and midpoints to minimize IR drop and high-frequency impedance in wide-bus layouts. |
| 4, 6, 9, 11, 14, 16, 19, 22, 27, 29, 32, 34, 37, 39, 42, 44 | GND | Distributed ground returns - paired with VCC pins to form local decoupling loops and suppress simultaneous switching noise. |
| 1DIR, 2DIR (Pins 1, 24) | Direction Control Input | Active-High logic selects A→B (DIR = H) or B→A (DIR = L); enables independent bidirectional control per octet group. |
| 1OE, 2OE (Pins 2, 23) | Output Enable Input | Active-Low logic disables all 8 outputs in respective octet; high state forces 3-state (high-Z) output regardless of DIR or data. |
| 1A1–1A8, 2A1–2A8 (Pins 47, 46, 44, 43, 41, 40, 38, 37, 36, 35, 33, 32, 30, 29, 27, 26) | Octet A Inputs/Outputs | Bidirectional I/O ports - function as inputs when DIR/OE configure B→A path, outputs when configured A→B. |
| 1B1–1B8, 2B1–2B8 (Pins 2, 3, 5, 6, 8, 9, 11, 12, 13, 14, 16, 17, 19, 20, 22, 23) | Octet B Inputs/Outputs | Complementary bidirectional I/O ports - mirror A-side behavior with independent DIR/OE control per octet. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pin architecture | Input and output pins located on opposite sides of package - eliminates layer jumps and vias in dense bus routing. |
| Distributed VCC/GND configuration | 16 total power/ground pins interleaved across package - reduces simultaneous switching noise by >15 dB vs. single-supply packages. |
| EPIC™ 1-µm CMOS process | 500-mA latch-up immunity at 125°C - enables robust operation in electrically noisy industrial environments without external protection. |
| Widebus™ family compatibility | Pin- and function-compatible with other TI Widebus transceivers (e.g., 74AC16244, 74AC16373) - simplifies design reuse and BOM consolidation. |
| 3.3 V / 5 V mixed-voltage support | Valid VIH/VIL thresholds across 3–5.5 V supply - allows direct interfacing with both LVCMOS and TTL logic families without translators. |
Applications
| Industrial Backplane Bus | Memory Address Buffering |
|---|---|
|
Use Scenario: Bidirectional data transfer between CPU and peripheral cards in modular PLC chassis using parallel 16-bit address/data multiplexed bus. IC Role / Device Role / Timing Role: Dual-octal transceiver isolates card-local buses during arbitration and enables hot-swap-safe address latching. Use Value: tPZL ≤ 10.7 ns at 5 V ensures sub-12 ns bus release, meeting 80 ns minimum turnaround time for ISA-compatible cycles. |
Use Scenario: Driving 16-bit address lines from microcontroller to multiple SRAM/Flash devices sharing common address bus. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state outputs prevents contention when multiple memory chips are selected sequentially. Use Value: ±24 mA drive strength sustains signal integrity across 100 mm daisy-chained address traces with 50 pF load per segment. |
| Test Equipment Data Acquisition | Legacy System Interfacing |
|
Use Scenario: Synchronizing high-speed digital I/O between FPGA-based acquisition module and legacy instrument controller via parallel bus. IC Role / Device Role / Timing Role: Direction-controlled transceiver adapts FPGA output timing to variable controller handshake protocols. Use Value: Flow-through layout minimizes skew between DIR-controlled A/B paths, preserving setup/hold margins under 10 ns clock jitter. |
Use Scenario: Bridging 5 V TTL-based industrial controller to modern 3.3 V microprocessor subsystem in retrofit upgrade. IC Role / Device Role / Timing Role: Level-tolerant bus interface providing voltage translation and bus isolation without external resistors. Use Value: VIH = 1.65 V min at VCC = 3.3 V accepts TTL-high signals directly; VOL ≤ 0.44 V ensures clean low-level recognition by 3.3 V receivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AC16244DLR | Noninverting octal buffer (unidirectional); no DIR input; 16 outputs only (no B-side I/O). | Suitable for fixed-direction address/data buffering where bidirectional flow is unnecessary. | Select when system requires only A→B or B→A path, not both - reduces control logic complexity and saves board space. |
| SN74LVC16245ADGGR | 3.3 V-only operation (1.65–3.6 V); lower drive (±24 mA @ 3.3 V); smaller 48-pin TSSOP package. | Optimized for low-power portable or battery-operated systems; not compatible with 5 V buses. | Choose for new 3.3 V designs prioritizing power efficiency and footprint; avoid if 5 V tolerance or mixed-voltage operation is required. |
Compared with 74AC16245DLR, the 74AC16244DLR removes bidirectional capability but simplifies control and reduces propagation delay by ~15%; the SN74LVC16245ADGGR cuts active power by 60% at 3.3 V but sacrifices 5 V interoperability and latch-up immunity.
Availability
74AC16245DLR is available at Aetrix Electronics and suitable for industrial backplanes, memory subsystems, test instrumentation, and legacy system upgrades requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AC16245DLR 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 industrial, automotive, and communications markets.
The 74AC16245DLR belongs to TI's Widebus™ family of high-speed bus interface ICs, engineered specifically for noise-resilient, high-density parallel bus architectures in industrial control and instrumentation systems.
FAQ
What is the maximum operating voltage for the 74AC16245DLR?
The 74AC16245DLR supports a supply voltage range of 3 V to 5.5 V. Absolute maximum rating is 7 V, but operation above 5.5 V violates recommended conditions and risks parametric failure or reduced reliability. TI specifies VOH/VOL, drive strength, and timing only within the 3–5.5 V range.
Does the 74AC16245DLR support hot-swap or live-insertion?
The 74AC16245DLR does not include built-in hot-swap protection circuitry. However, its 500-mA latch-up immunity and robust 3-state isolation (tPZL ≤ 18 ns) enable safe use in hot-pluggable backplanes when combined with external current-limiting and sequencing controls per TI Application Report SCBA005.
How many independent 3-state control groups does the 74AC16245DLR have?
The 74AC16245DLR has two independent 3-state control groups: one for pins 1A1–1A8/1B1–1B8 (controlled by 1OE), and another for pins 2A1–2A8/2B1–2B8 (controlled by 2OE). Each group can be enabled or disabled separately, allowing partial bus isolation without affecting the other octet.
Can the 74AC16245DLR interface directly between 3.3 V and 5 V logic domains?
Yes - the 74AC16245DLR operates natively from 3 V to 5.5 V and accepts input voltages up to VCC + 0.5 V. When powered at 3.3 V, it recognizes 5 V TTL-high inputs (VIH ≥ 2.0 V), and when powered at 5 V, its outputs swing rail-to-rail, safely driving 3.3 V inputs with appropriate current limiting if required.
What is the thermal resistance (θJA) of the 74AC16245DLR in its DL package?
Texas Instruments does not publish θJA for the DL package in the SCAS235A datasheet. However, based on its 1.2 W maximum power dissipation rating at TA = 55°C in still air and typical DL package geometry, θJA is estimated at ≈ 105°C/W. For precise thermal modeling, TI recommends using the thermal simulation data in their Semiconductor and IC Package Thermal Metrics application report.
74AC16245DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
74AC16245DLR FAQ
1.How can I place an order for 74AC16245DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC16245DLR 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 74AC16245DLR reliable?
The price and inventory of 74AC16245DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16245DLR is usually 5 days.
3.What payment methods are accepted for 74AC16245DLR?
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4.How is shipping managed for 74AC16245DLR?
74AC16245DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC16245DLR 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 74AC16245DLR?
For technical support, including 74AC16245DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16245DLR requirements.
6.How does Aetrix verify that 74AC16245DLR is sourced from the original manufacturer or authorized distributors?
All 74AC16245DLR 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 74AC16245DLR meets industry standards.
7.What is the process for return or replacement of 74AC16245DLR?
All 74AC16245DLR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16245DLR, 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 74AC16245DLR part is unused and in its original packaging.
Return procedure for 74AC16245DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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