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Texas Instruments SN74ALB16245DL
- Part No.:
- SN74ALB16245DL
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALB16245DL.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,185
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Product details
Overview
SN74ALB16245DL from Texas Instruments is a 3.3-V, 16-bit ALB (Advanced Low-Voltage BiCMOS) transceiver with 3-state outputs, designed for high-speed bidirectional data bus interfacing between A and B buses in industrial and telecom backplanes. It features 1.3 ns typical propagation delay, ±25 mA output drive, and industry-standard '16245 pinout in a 48-pin SSOP package.
For engineers reviewing the SN74ALB16245DL datasheet, SN74ALB16245DL pinout, SN74ALB16245DL application, or SN74ALB16245DL equivalent, key selection criteria include 3.3-V operation compatibility, 3-state isolation timing (tdis = 4.2 ns max), flow-through PCB layout support, and Schottky-clamped input protection against overshoot/undershoot in noise-sensitive systems.
Technical Context
The SN74ALB16245DL implements dual 8-bit transceiver sections-each controlled independently by DIR and OE inputs-enabling flexible unidirectional or bidirectional data routing. Its ALB process delivers low propagation delay (tpd ≤ 2 ns) while maintaining TTL-compatible logic thresholds at 3.3 V.
Distributed VCC/GND pins minimize simultaneous switching noise, and Schottky diodes on all I/O ports suppress transient voltage excursions beyond VCC + 0.5 V or GND – 0.5 V, supporting robust signal integrity in mixed-voltage board designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0 V to 3.6 V - Ensures stable operation across industrial 3.3-V supply tolerances without level-shifting circuitry. |
| Propagation Delay (tpd) | 0.6–2.0 ns - Enables sub-500-MHz bus timing margins in high-speed memory or processor interconnects. |
| Output Drive (IOL/IOH) | ±25 mA - Supports driving 50-pF loads across 10+ cm traces without signal degradation. |
| Enable/Disable Time (ten/tdis) | 1.5–6.0 ns / 1.8–4.2 ns - Guarantees fast bus arbitration and isolation during hot-swap or power-gating events. |
| Input Capacitance (Ci) | 3.5 pF - Minimizes loading on upstream drivers, preserving edge rates in fan-out-heavy topologies. |
| Thermal Resistance (θJA) | 63°C/W (DL package) - Allows continuous operation up to 85°C ambient with standard PCB copper pour. |
Pinout & Package
SN74ALB16245DL uses a 48-pin SSOP (DL) package with 0.5-mm pitch, 12.4 mm × 6.0 mm body size, and 1.2-mm max height-optimized for space-constrained industrial control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction Control Input | Active-High logic selects A→B (DIR=H) or B→A (DIR=L) data flow per 8-bit section. |
| 1OE, 2OE | Output Enable Input | Active-Low enables 3-state outputs; OE=H isolates both buses with <20 µA leakage current. |
| 1A1–1A8, 2A1–2A8 | Port A Data Inputs/Outputs | First and second 8-bit A-side I/O banks; electrically identical, each with Schottky clamping. |
| 1B1–1B8, 2B1–2B8 | Port B Data Inputs/Outputs | Corresponding B-side I/O banks; supports independent direction control per section. |
| VCC (Pins 7, 18, 29, 40) | Power Supply | Distributed VCC pins reduce IR drop and high-frequency noise coupling across the 16-bit bus. |
| GND (Pins 4, 10, 15, 21, 27, 32, 38, 43) | Ground Reference | Eight dedicated GND pins ensure low-impedance return paths and minimize ground bounce in fast-switching operation. |
Key Features
| Feature | Design Value |
|---|---|
| ALB BiCMOS Process | Combines bipolar speed and CMOS low static power: ICCZ = 0.8 mA (standby), ICC/buffer = 5.6 mA (active). |
| Flow-Through Architecture | Input and output pins arranged on opposite sides of package-simplifies layer routing and reduces trace crossovers on 2-layer PCBs. |
| Schottky-Clamped Inputs | Prevents input overshoot > VCC + 0.5 V and undershoot < –0.9 V, eliminating need for external TVS or RC snubbers. |
| Industry-Standard '16245 Pinout | Enables drop-in replacement of legacy 74LVC16245 or 74ALVC16245 in existing layouts without redesign. |
Applications
| Backplane Data Bus Interface | Processor-to-Peripheral Bridge |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA fabric to legacy 5-V or mixed-voltage peripheral cards via passive backplane. IC Role / Device Role / Timing Role: Bidirectional level-tolerant transceiver managing A/B bus handshaking with sub-2-ns propagation delay and precise enable/disable timing. Use Value: Eliminates discrete level shifters while maintaining signal integrity across 20-cm backplane traces under EMI stress. | Use Scenario: Connecting an ARM-based SoC's parallel memory interface to external SRAM or flash devices with strict setup/hold timing. IC Role / Device Role / Timing Role: 16-bit data path buffer with independent DIR/OE control per byte lane, enabling burst-mode read/write arbitration. Use Value: Reduces bus contention risk during DMA transfers via 4.2-ns max disable time and <20-µA high-Z leakage. |
| Industrial PLC I/O Module | Telecom Line Card Buffering |
Use Scenario: Isolating field I/O signals from controller CPU in DIN-rail mounted programmable logic controllers operating at –40°C to 85°C. IC Role / Device Role / Timing Role: Robust 3-state transceiver providing galvanically isolated data coupling between sensor/actuator buses and main logic plane. Use Value: Withstands repeated hot-plug cycles and ESD events due to Schottky clamping and ±50-mA output clamp current rating. | Use Scenario: Buffering high-speed control signals between DSP cores and analog front-end ASICs in 10Gbps optical line cards. IC Role / Device Role / Timing Role: Low-jitter, low-noise data path conditioner ensuring clean clock-domain crossing between baseband and RF subsystems. Use Value: Distributed VCC/GND pins and 63°C/W θJA sustain reliable operation in thermally dense card cages without forced air. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245ADLR | Lower drive (±24 mA), higher tpd (3.2 ns max), same DL package and pinout. | Targeted at cost-sensitive consumer boards where 1-ns timing margin is acceptable. | Select when thermal budget is tighter (θJA = 70°C/W) and full ALB speed is unnecessary. |
| SN74ALVC16245DLR | ALVC process: lower ICC (3.5 mA/buffer), but no Schottky clamping; tpd = 2.8 ns max. | Suitable for benign lab environments; lacks overshoot suppression for noisy industrial backplanes. | Choose only if system-level EMI filtering is already implemented upstream of the transceiver. |
Compared with SN74LVC16245ADLR and SN74ALVC16245DLR, the SN74ALB16245DL delivers superior noise immunity and 1.5× faster propagation-critical for deterministic real-time control loops and high-density backplane routing where signal fidelity outweighs marginal cost savings.
Availability
SN74ALB16245DL is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and embedded computing applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for SN74ALB16245DL 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ALB16245DL belongs to TI's Widebus™ family-designed specifically for high-speed, low-voltage bus interface applications demanding minimal propagation delay, robust noise immunity, and seamless integration into 3.3-V system architectures.
FAQ
What is the maximum operating temperature range for the SN74ALB16245DL?
The SN74ALB16245DL is rated for operation from –40°C to +85°C ambient temperature, validated per TI's recommended operating conditions and absolute maximum ratings. This range supports deployment in industrial control cabinets and telecom equipment without derating, provided PCB thermal design maintains junction temperature below 125°C using the specified 63°C/W θJA.
Does the SN74ALB16245DL support true bidirectional data flow on the same bus pair?
Yes-the SN74ALB16245DL supports true bidirectional operation via its two independent DIR/OE controls: one 8-bit section routes data A→B when 1DIR=H, and the other routes B→A when 2DIR=L. This allows concurrent, non-conflicting transfers across separate byte lanes without external logic, unlike single-direction-only buffers.
Can the SN74ALB16245DL be used with 5-V logic systems?
No-the SN74ALB16245DL is strictly a 3.3-V device (VCC = 3.0–3.6 V). Its inputs tolerate up to VCC + 0.5 V (≤4.1 V), so direct connection to 5-V outputs risks damage or undefined behavior. For mixed-voltage interfaces, use TI's SN74AVC16T245 or discrete level-shifting solutions instead of the SN74ALB16245DL.
How does the flow-through architecture of the SN74ALB16245DL improve PCB layout?
The SN74ALB16245DL places A-side I/Os on one half and B-side I/Os on the opposite half of the 48-pin SSOP package, enabling straight-through trace routing with zero crossovers. This reduces layer count, eliminates vias in critical data paths, and cuts parasitic inductance-directly improving signal integrity for >100-MHz bus operation.
Is the SN74ALB16245DL pin-compatible with older 74-series transceivers?
Yes-the SN74ALB16245DL uses the industry-standard '16245 pinout, matching pin-for-pin with legacy devices like the 74F16245 and 74LVC16245. This allows direct replacement in existing designs without PCB modification, provided VCC is regulated to 3.3 V and thermal limits are verified for the ALB process's slightly higher dynamic current.
SN74ALB16245DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALB
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 25mA, 25mA
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74ALB16245DL FAQ
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5.How can I obtain technical support or documentation for SN74ALB16245DL?
For technical support, including SN74ALB16245DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALB16245DL requirements.
6.How does Aetrix verify that SN74ALB16245DL is sourced from the original manufacturer or authorized distributors?
All SN74ALB16245DL 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 SN74ALB16245DL meets industry standards.
7.What is the process for return or replacement of SN74ALB16245DL?
All SN74ALB16245DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALB16245DL, 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 SN74ALB16245DL part is unused and in its original packaging.
Return procedure for SN74ALB16245DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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