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Texas Instruments SN74ABT16245ADLR
- Part No.:
- SN74ABT16245ADLR
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16245ADLR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,426
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Product details
Overview
SN74ABT16245ADLR from Texas Instruments is a 16-bit noninverting bus transceiver with 3-state outputs in a 48-pin SSOP (DL) package, operating from 4.5 V to 5.5 V over –40°C to 85°C. It supports bidirectional data flow between A and B buses via DIR control, features high-drive outputs (–32 mA IOH / 64 mA IOL), and maintains high-impedance state during power-up/down for system-level bus isolation in industrial backplane interfaces.
For engineers reviewing the SN74ABT16245ADLR datasheet, SN74ABT16245ADLR pinout, SN74ABT16245ADLR application, or SN74ABT16245ADLR equivalent, this page delivers verified electrical specs, functional pin mapping, real-world use cases in synchronous bus bridging, and validated alternative parts for design continuity and supply resilience.
Technical Context
The SN74ABT16245ADLR implements dual 8-bit transceiver sections (A↔B) with independent direction (DIR) and output-enable (OE) controls per section. Its EPIC-IIB™ BiCMOS architecture enables low ground bounce (<1 V VOLP at 5 V) and distributed VCC/GND pins to suppress high-speed switching noise.
It operates in three functional states: A-to-B transmission (DIR = H, OE = L), B-to-A transmission (DIR = L, OE = L), or full bus isolation (OE = H). The device enters high-impedance mode when VCC is below 2.1 V, and requires external pullup on OE above that threshold to guarantee isolation.
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 domains and stable operation under rail tolerance. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including programmable logic controllers and data acquisition modules. |
| Output Drive | –32 mA IOH / +64 mA IOL - drives heavy capacitive loads (e.g., >50 pF) and multiple TTL inputs without signal degradation. |
| Propagation Delay | 1 ns to 3.9 ns (tPLH/tPHL at 5 V, 25°C) - supports synchronous bus speeds up to ~250 MHz in short-trace applications. |
| 3-State Enable Time | tPZL = 1 ns to 5.4 ns, tPHZ = 2 ns to 6.3 ns - enables precise timing control for dynamic bus arbitration and hot-swap readiness. |
| Input Clamp Current | –18 mA (IIK) - protects against transient overvoltage events on control lines without external diodes. |
| ESD Rating | 2000 V HBM, 200 V MM - meets MIL-STD-883 requirements for robustness in manufacturing and field environments. |
Pinout & Package
SN74ABT16245ADLR uses a 48-pin Shrink Small-Outline Package (SSOP-DL), 12.6 mm × 6.1 mm × 1.95 mm body, JEDEC MO-153 compliant, with 0.5-mm pitch and Q1 pin-1 orientation in tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per 8-bit section) | Logic level selects data flow direction: DIR = H enables A→B; DIR = L enables B→A. |
| 1OE, 2OE | Output-enable input (per 8-bit section) | Active-low signal disables outputs into high-impedance state, isolating respective A/B bus segments. |
| 1A1–1A8, 2A1–2A8 | A-side data I/O terminals | Connect to upstream bus or controller; driven by internal transceiver logic when enabled and directionally aligned. |
| 1B1–1B8, 2B1–2B8 | B-side data I/O terminals | Connect to downstream bus or peripheral; electrically isolated when OE = H or during power ramp. |
| VCC (Pins 7, 18, 29, 40) | Power supply | Distributed VCC pins minimize IR drop and reduce simultaneous switching noise across 16-bit data paths. |
| GND (Pins 4, 10, 21, 31, 42) | Ground reference | Multiple GND pins provide low-inductance return paths, critical for maintaining signal integrity at high edge rates. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pin architecture | Input and output pins placed on opposite sides of package - simplifies PCB routing, reduces layer count, and avoids signal crossovers. |
| High-impedance during power sequencing | Automatically enters Hi-Z when VCC ∈ [0, 2.1 V] - prevents bus contention during power-up/down in multi-rail systems. |
| Distributed VCC/GND pin layout | Four VCC and five GND pins interleaved across package - lowers power-supply impedance and suppresses ground bounce (VOLP < 1 V). |
| Widebus™ family compatibility | Pin- and function-compatible with other TI Widebus transceivers (e.g., SN74ABT16244A) - enables scalable bus interface designs. |
| Latch-up immunity | Exceeds 500 mA per JESD70 - ensures robust operation in noisy industrial environments with EFT or surge exposure. |
Applications
| Industrial Backplane Interface | Modular PLC I/O Expansion |
|---|---|
|
Use Scenario: Interfacing CPU module to hot-swappable I/O carrier cards in a 19-inch rack-mounted PLC chassis. IC Role / Device Role / Timing Role: Bidirectional 16-bit bus transceiver synchronizing parallel address/data transfers between main controller and peripheral modules. Use Value: Enables deterministic bus arbitration via DIR/OE control, while high-drive capability maintains signal integrity across 15-cm backplane traces loaded with 10+ nodes. |
Use Scenario: Isolating field-side digital input/output signals from processor-side logic in modular PLC base units. IC Role / Device Role / Timing Role: Level-shifting and bus-segmenting transceiver supporting concurrent read/write operations across dual 8-bit ports. Use Value: Prevents fault propagation between modules; Hi-Z during power cycling eliminates bus contention during card insertion/removal. |
| Test Equipment Data Bus Bridge | Legacy System Protocol Adapter |
|
Use Scenario: Connecting FPGA-based pattern generator to DUT's parallel test interface in automated test equipment (ATE). IC Role / Device Role / Timing Role: Synchronous 16-bit data path buffer with sub-4 ns propagation delay and controlled enable timing. Use Value: Meets tight setup/hold margins for 100-MHz test clock domains; low ground bounce ensures clean strobe and data edges. |
Use Scenario: Adapting ISA-bus peripherals to modern microcontroller-based control boards in retrofitted factory machinery. IC Role / Device Role / Timing Role: Noninverting transceiver translating between legacy 5-V ISA data bus and MCU GPIO banks. Use Value: Supports direct connection without level shifters; 64-mA sink current drives ISA bus capacitance and termination loads reliably. |
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 |
|---|---|---|---|
| SN74ABT16245ADGVR | TVSOP-48 package (4.4 mm × 6.1 mm); identical electrical specs and pinout. | Preferred for space-constrained PCBs where height ≤1.2 mm is required; same thermal performance but lower footprint area. | Select SN74ABT16245ADGVR when board area is limited and reflow profile supports TVSOP handling. |
| SN74LVC16245A | 3.3-V only operation (1.65–3.6 V); lower drive (–24/+24 mA); CMOS process (no BiCMOS). | Suitable for mixed-voltage systems with 3.3-V core logic; not interoperable with 5-V buses without level translation. | Choose SN74LVC16245A only in pure 3.3-V domains; avoid in 5-V legacy interfaces where SN74ABT16245ADLR provides native voltage compatibility. |
Compared with SN74ABT16245ADGVR, SN74ABT16245ADLR offers identical functionality in a wider SSOP package better suited for manual inspection and hand-soldering, while SN74LVC16245A trades 5-V compatibility for lower power and smaller size in modern low-voltage designs.
Availability
SN74ABT16245ADLR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ABT16245ADLR 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 delivering analog, embedded processing, and connectivity solutions with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74ABT16245ADLR belongs to TI's Widebus™ family of high-speed bus interface ICs, engineered specifically for robust, low-noise bidirectional data transfer in industrial backplanes and modular control systems.
FAQ
What is the maximum clock frequency supported by SN74ABT16245ADLR in a synchronous bus application?
The SN74ABT16245ADLR does not include an internal clock; it is a level-sensitive transceiver. Its usable data rate depends on external timing. With typical propagation delays of 1–3.9 ns and 50-pF load, it supports reliable operation in systems with bus cycles ≥10 ns (i.e., up to 100 MHz sustained throughput), assuming proper PCB layout and termination.
Does SN74ABT16245ADLR require external pull-up resistors on its OE pins?
Yes - to guarantee high-impedance state when VCC exceeds 2.1 V, OE must be held high. TI recommends tying OE to VCC through a pullup resistor; minimum value depends on driver sink capability but typically ranges from 1 kΩ to 10 kΩ for robust noise immunity and fast disable timing.
Can SN74ABT16245ADLR be used in a 3.3-V system?
No - SN74ABT16245ADLR is specified only for 4.5 V to 5.5 V operation. Using it below 4.5 V risks undefined logic thresholds, increased propagation delay, and potential output contention. For 3.3-V systems, consider SN74LVC16245A instead.
How many ground pins does SN74ABT16245ADLR have, and why are they distributed?
SN74ABT16245ADLR has five dedicated GND pins (pins 4, 10, 21, 31, 42). Their distributed placement minimizes shared-impedance noise between switching outputs, reduces ground bounce (VOLP < 1 V), and maintains signal integrity across all 16 data lines during simultaneous switching events.
Is SN74ABT16245ADLR pin-compatible with SN74ABT16244A?
No - SN74ABT16244A is a 16-bit buffer (noninverting, unidirectional), while SN74ABT16245ADLR is a transceiver (bidirectional with DIR control). Pin counts and functions differ: SN74ABT16244A lacks DIR inputs and has separate A/B-side enables, making them functionally and physically incompatible despite shared Widebus lineage.
SN74ABT16245ADLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- 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:
- 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
SN74ABT16245ADLR FAQ
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6.How does Aetrix verify that SN74ABT16245ADLR is sourced from the original manufacturer or authorized distributors?
All SN74ABT16245ADLR 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 SN74ABT16245ADLR meets industry standards.
7.What is the process for return or replacement of SN74ABT16245ADLR?
All SN74ABT16245ADLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16245ADLR, 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 SN74ABT16245ADLR part is unused and in its original packaging.
Return procedure for SN74ABT16245ADLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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