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Texas Instruments SN74ABTH16245DL
- Part No.:
- SN74ABTH16245DL
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABTH16245DL.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,780
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Product details
Overview
SN74ABTH16245DL from Texas Instruments is a 16-bit noninverting bus transceiver with 3-state outputs, designed for synchronous two-way data communication between A and B buses in high-speed digital systems. It operates from 4.5 V to 5.5 V, supports –32-mA high-drive IOH and 64-mA IOL, features bus-hold on all data inputs, and maintains high-impedance state during power up/down (VCC < 2.1 V). It is used in industrial backplane interfaces and memory expansion subsystems.
For engineers reviewing the SN74ABTH16245DL datasheet, SN74ABTH16245DL pinout, SN74ABTH16245DL application, or SN74ABTH16245DL equivalent, key selection criteria include bidirectional 16-bit data flow control, 3-state isolation timing (tPZH/tPLZ ≤ 6.4 ns), bus-hold functionality eliminating external resistors, and SSOP-48 package compatibility with legacy board layouts.
Technical Context
The SN74ABTH16245DL implements dual 8-bit or unified 16-bit transceiver logic using EPIC-IIB BiCMOS process, enabling low-power, high-noise-immunity operation. Its DIR input selects direction (A→B or B→A), while OE enables/disables both ports simultaneously into high-impedance state.
It integrates distributed VCC/GND pins and flow-through pin architecture to minimize switching noise and optimize PCB routing. Bus-hold circuitry actively maintains valid logic levels on unused A/B port inputs without external components, and output ground bounce (VOLP) remains below 1 V at 5 V and 25°C.
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 temperature range. |
| Output Drive | –32 mA IOH / 64 mA IOL - provides robust signal integrity driving heavy capacitive loads or multiple TTL inputs without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 3.9 ns (max) - supports >250-MHz bus toggle rates in point-to-point or lightly loaded configurations. |
| Bus-Hold Current | ±100 µA at VI = 0.8 V or 2 V - eliminates need for pullup/pulldown resistors on floating data lines, reducing BOM count and layout complexity. |
| Power-Up State | High-impedance when VCC < 2.1 V - prevents bus contention during power sequencing in multi-rail systems. |
| Thermal Resistance | θJA = 94°C/W (DL package) - defines maximum junction temperature rise under typical PCB copper area, guiding thermal design for continuous operation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control, instrumentation, and communications equipment. |
Pinout & Package
SN74ABTH16245DL uses a 48-pin Shrink Small-Outline Package (SSOP-DL) with 0.5-mm pitch, 12.4 mm × 6.1 mm body, and 1.2-mm max height per JEDEC MO-153. Pin 1 identifier is marked in top-left corner of package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per 8-bit section) | Determines data flow direction: DIR = L enables B→A; DIR = H enables A→B - allows independent or synchronized 8-bit channel operation. |
| 1OE, 2OE | Output enable input (active-low) | Drives both A and B ports into high-impedance state when high - enables bus isolation and hot-swap capability. |
| 1A1–1A8, 2A1–2A8 | Port A data inputs/outputs | Bi-directional I/O pins for first and second 8-bit bus segment - share same electrical characteristics and timing behavior as B-side pins. |
| 1B1–1B8, 2B1–2B8 | Port B data inputs/outputs | Bi-directional I/O pins mirroring A-side functionality - full 16-bit path established when DIR and OE are asserted appropriately. |
| VCC, GND | Power and ground terminals | Distributed across package (12× VCC, 12× GND) - reduces simultaneous switching noise and improves signal integrity at high frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS process | Combines bipolar speed with CMOS low static power - achieves 3.4 ns typical propagation delay while holding ICC < 32 mA under full load. |
| Flow-through pin architecture | Input and output pins aligned on opposite sides of package - simplifies layer routing, minimizes trace crossovers, and reduces parasitic inductance in dense PCB layouts. |
| Bus-hold circuitry | Active retention of last valid logic state on floating A/B inputs - removes requirement for 10-kΩ external pull resistors, saving board space and assembly cost. |
| Distributed VCC/GND | Multiple power/ground pairs interleaved across pin rows - lowers impedance of power delivery network and suppresses ground bounce (VOLP < 1 V). |
| Power-up/power-down isolation | Automatic high-Z state when VCC is below 2.1 V - prevents metastability or contention during brown-out or staggered supply ramp-up sequences. |
Applications
| Industrial Backplane Interface | Memory Expansion Subsystem |
|---|---|
Use Scenario: Interfacing microcontroller local bus to modular I/O carrier board via 16-bit parallel backplane. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow between processor and peripheral modules with precise OE-controlled isolation. Use Value: Eliminates bus contention during module insertion/removal and enables deterministic timing with tPLZ ≤ 5.2 ns disable latency. | Use Scenario: Extending address/data bus between SoC and external SRAM/Flash in programmable logic controller. IC Role / Device Role / Timing Role: 16-bit data path buffer with bus-hold maintaining valid states during address latching and chip-select assertion windows. Use Value: Removes need for 32 external pull resistors, reduces layout congestion, and guarantees setup/hold margin via 1 ns min tSU/tH. |
| Test Equipment Data Acquisition | Legacy System Bus Bridge |
Use Scenario: Synchronizing high-speed ADC sample data streams to FPGA processing engine over parallel LV-TTL interface. IC Role / Device Role / Timing Role: Low-skew transceiver isolating acquisition front-end from reconfigurable logic domain with controlled enable timing. Use Value: Achieves sub-4 ns propagation delay consistency across all 16 bits, supporting 250+ MSPS sampling without inter-channel skew. | Use Scenario: Adapting ISA or VMEbus signals to modern controller with mismatched drive strength and voltage thresholds. IC Role / Device Role / Timing Role: Robust 5-V tolerant interface providing 64-mA sink capability to drive legacy TTL loads while accepting CMOS-level inputs. Use Value: Enables drop-in replacement of obsolete transceivers without redesigning termination networks or timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245ADLR | 3.3-V only operation (1.65–3.6 V), lower drive (–24/+24 mA), no bus-hold | Requires level-shifting for 5-V systems; lacks passive input retention - needs external biasing | Select when migrating to 3.3-V infrastructure and external pull resistors are acceptable. |
| SN74ABT16245DGGR | Same electrical specs but TSSOP-48 (DGG) package; θJA = 89°C/W vs. DL's 94°C/W | Higher thermal efficiency and finer pitch; requires updated footprint and stencil design | Prefer for new designs prioritizing thermal performance and automated assembly compatibility. |
Compared with SN74LVC16245ADLR and SN74ABT16245DGGR, the SN74ABTH16245DL uniquely delivers 5-V operation with integrated bus-hold and SSOP-48 mechanical compatibility - making it optimal for industrial retrofits and mixed-voltage backplanes where layout reuse and input stability are critical.
Availability
SN74ABTH16245DL is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, and test equipment data acquisition requiring stable component supply, long-term lifecycle support, and consistent SSOP-48 packaging.
Supply support for SN74ABTH16245DL 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 heritage in high-reliability interface ICs.
The SN74ABTH16245DL belongs to TI's Widebus™ family of high-speed bus interface devices, engineered specifically for noise-resilient, high-drive 5-V data transfer in industrial control, instrumentation, and communications infrastructure.
FAQ
What is the maximum operating frequency supported by the SN74ABTH16245DL?
The SN74ABTH16245DL does not specify a maximum clock frequency directly, but its propagation delay (tPLH/tPHL ≤ 3.9 ns) and enable/disable times (tPZL/tPHZ ≤ 6.4 ns) support reliable operation at bus toggle rates exceeding 250 MHz under typical 50-pF load conditions. Actual system frequency depends on trace length, termination, and fanout - verified timing margins must be calculated per application.
Does the SN74ABTH16245DL require external pull-up or pull-down resistors on its data lines?
No, the SN74ABTH16245DL includes active bus-hold circuitry on all A and B port inputs, which maintains the last valid logic state when inputs float. This eliminates the need for external pull-up or pull-down resistors, reducing BOM cost and PCB real estate - a confirmed feature documented in the SCBS662I datasheet Section 1.
Can the SN74ABTH16245DL be used in systems with mixed 3.3-V and 5-V logic domains?
The SN74ABTH16245DL is specified for 4.5–5.5 V operation only and is not 3.3-V compatible. Its inputs tolerate up to 5.5 V, but it cannot be powered from 3.3 V. For mixed-domain interfacing, use level-shifting transceivers like SN74AVC16T245 or pair SN74ABTH16245DL with discrete level translators - confirmed by absolute maximum ratings and recommended operating conditions in the datasheet.
What is the thermal resistance (θJA) of the SN74ABTH16245DL in its SSOP-DL package?
The SN74ABTH16245DL has a junction-to-ambient thermal resistance (θJA) of 94°C/W in the SSOP-DL package, measured per JESD 51 standards on a standard JEDEC test board. This value assumes typical PCB copper area and guides thermal derating calculations for continuous operation at full output drive and ambient temperatures up to +85°C.
How does the SN74ABTH16245DL behave during power-up and power-down sequences?
When VCC is between 0 V and 2.1 V, the SN74ABTH16245DL automatically enters a high-impedance state on all I/O pins - preventing bus contention during power ramp-up or brown-out. Above 2.1 V, OE must be actively controlled (e.g., pulled high via resistor) to guarantee isolation, as stated in the functional description and recommended operating conditions of the SCBS662I datasheet.
SN74ABTH16245DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABTH
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74ABTH16245DL FAQ
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The price and inventory of SN74ABTH16245DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABTH16245DL is usually 5 days.
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5.How can I obtain technical support or documentation for SN74ABTH16245DL?
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6.How does Aetrix verify that SN74ABTH16245DL is sourced from the original manufacturer or authorized distributors?
All SN74ABTH16245DL 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 SN74ABTH16245DL meets industry standards.
7.What is the process for return or replacement of SN74ABTH16245DL?
All SN74ABTH16245DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTH16245DL, 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 SN74ABTH16245DL part is unused and in its original packaging.
Return procedure for SN74ABTH16245DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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