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Texas Instruments SN74CBT16245DGG
- Part No.:
- SN74CBT16245DGG
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74CBT16245DGG.pdf
- Description:
- IC 16-BIT FET BUS SW 48-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,770
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Product details
Overview
SN74CBT16245DGG from Texas Instruments is a 16-bit high-speed TTL-compatible bus switch IC organized as two independent 8-bit bidirectional low-impedance switches, featuring 5-Ω typical on-state resistance, 0.25 ns propagation delay at 5 V, and operation across −40°C to 85°C for automotive-grade signal routing in memory expansion and FPGA I/O bridging.
For engineers reviewing the SN74CBT16245DGG datasheet, SN74CBT16245DGG pinout, SN74CBT16245DGG application, or SN74CBT16245DGG equivalent, key selection criteria include bidirectional switching capability, OE-controlled high-impedance isolation, TTL-level compatibility, thermal performance (θJA = 70°C/W), and TSSOP-48 package suitability for space-constrained PCB layouts.
Technical Context
The SN74CBT16245DGG implements dual 8-bit analog bus switches with separate OE inputs per bank, enabling independent enable/disable control of A↔B data paths. Its CMOS-based transmission-gate architecture delivers rail-to-rail analog switching with no internal level-shifting or direction control logic.
Each switch channel exhibits flat on-resistance (<7 Ω max over voltage and temperature), low off-capacitance (4.5 pF), and negligible charge injection-critical for maintaining signal integrity in hot-swap and dynamic bus reconfiguration applications without latch-up risk (exceeds 100 mA per JESD 78 Class II).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V - enables minimal voltage drop and signal distortion in 3.3 V/5 V digital bus paths |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V - supports >1 GHz signal bandwidth with sub-nanosecond timing precision |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5 V TTL and mixed-voltage system rails |
| Input voltage tolerance | −0.5 V to 7 V - allows safe operation during hot-insertion and undershoot/overshoot transients |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial handling and board-level ESD robustness requirements |
| Thermal resistance (θJA) | 70°C/W (TSSOP-DGG) - defines maximum power dissipation limit (≈71 mW at 50°C ambient rise) |
| Operating temperature | −40°C to +85°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
TSSOP-48 (DGG) package: 12.0 mm × 6.1 mm × 1.2 mm body, 0.5 mm pitch, exposed pad not present, JEDEC MO-153 compliant, RoHS Pb-Free (CU NIPDAU), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 8-bit switch banks; high state isolates A/B ports with high-Z |
| 1A1–1A8, 2A1–2A8 | Port A terminals (Bank 1 & 2) | Bidirectional signal inputs/outputs tied to first set of system buses or controllers |
| 1B1–1B8, 2B1–2B8 | Port B terminals (Bank 1 & 2) | Bidirectional signal inputs/outputs connected to second bus segment (e.g., memory, peripheral) |
| VCC (Pins 7, 18, 29, 40) | Power supply | Four distributed VCC pins reduce IR drop and improve noise immunity across wide bus |
| GND (Pins 4, 11, 22, 33) | Ground reference | Four dedicated GND pins provide low-inductance return paths for all 16 channels |
| NC (Pins 1, 24, 25, 48) | No internal connection | Unbonded pads; must remain unconnected to avoid parasitic coupling or mechanical stress |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Minimizes insertion loss and maintains signal edge fidelity in high-speed parallel buses up to 500 Mbps |
| Independent OE control per 8-bit bank | Enables selective isolation of memory vs. peripheral segments without global bus shutdown |
| TTL-compatible input thresholds | VIH = 2 V min / VIL = 0.8 V max ensures reliable interfacing with legacy 5 V microcontrollers and FPGAs |
| High-impedance off-state | Isolates ports with <1 µA leakage, preventing contention and back-driving in shared-bus topologies |
| Automotive qualification (Q1) | Meets AEC-Q100 Grade 2 requirements for temperature, ESD, and latch-up in vehicle ECUs and ADAS modules |
Applications
| Memory Expansion Interface | FPGA I/O Voltage Translation |
|---|---|
|
Use Scenario: Expanding address/data bus between microcontroller and external SRAM/Flash in embedded control units. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling seamless read/write access across voltage domains without direction control logic. Use Value: Eliminates need for discrete transceivers or level shifters while preserving nanosecond-scale timing margins required for 100+ MHz bus clocks. |
Use Scenario: Interfacing 3.3 V FPGA I/O banks with 5 V legacy peripherals (e.g., LCD controllers, ADCs). IC Role / Device Role / Timing Role: Passive voltage-tolerant bus switch providing level-agnostic signal routing without active translation delay. Use Value: Maintains signal integrity across mixed-voltage boundaries with <0.3 ns skew between channels, avoiding setup/hold violations. |
| Hot-Swappable Module Backplane | PCI/ISA Bus Isolation |
|
Use Scenario: Enabling safe insertion/removal of add-in cards in industrial PC backplanes without powering down the host system. IC Role / Device Role / Timing Role: OE-controlled isolation gate preventing bus contention and ground bounce during plug-in events. Use Value: Supports hot-swap compliance via fast disable time (tdis = 3.9 ns) and robust ESD protection (2000-V HBM) on all pins. |
Use Scenario: Segmenting legacy PCI or ISA bus segments to prevent noise coupling and fault propagation between subsystems. IC Role / Device Role / Timing Role: Low-capacitance (4.5 pF) switch isolating clock and data lines while maintaining signal rise/fall times. Use Value: Reduces inter-segment crosstalk by >25 dB at 100 MHz and avoids timing jitter accumulation in multi-slot configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16245DGGR | Includes integrated 5-V tolerant level-shifting (VCC = 3.3 V operation with 5 V I/O), higher ron (7 Ω typ) | Suitable for strict 3.3 V core systems interfacing to 5 V peripherals where voltage translation is mandatory | Choose when mixed-voltage domain bridging is required beyond passive switching |
| 74LVC16245ADGG | True 3.3 V CMOS transceiver with direction control (DIR pin), not bidirectional analog switch; 3-state only | Requires explicit direction management and cannot support simultaneous A→B and B→A traffic on same line | Prefer only if system design mandates directional control and accepts added logic complexity |
Compared with SN74CBTD16245DGGR and 74LVC16245ADGG, the SN74CBT16245DGG uniquely delivers true bidirectional analog switching with lowest ron and fastest tpd, making it optimal for high-fidelity, low-latency bus extension where direction independence and minimal signal degradation are critical.
Availability
SN74CBT16245DGG is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA I/O bridging, hot-swappable module backplanes, and PCI/ISA bus isolation requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.
Supply support for SN74CBT16245DGG 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 innovation in high-speed interface and signal-integrity technologies.
The SN74CBT16245DGG belongs to TI's Widebus™ family of bus switches, designed specifically for low-latency, bidirectional signal routing in high-speed digital systems where traditional transceivers introduce unacceptable timing overhead or voltage-domain limitations.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT16245DGG?
The SN74CBT16245DGG supports a continuous channel current of 128 mA per switch path, verified under absolute maximum ratings. This rating applies across the full operating temperature range and ensures reliable conduction without thermal runaway when used within recommended VCC (4 V to 5.5 V) and ambient conditions. Exceeding this current may degrade ron stability or accelerate electromigration.
Does the SN74CBT16245DGG require external pull-up or pull-down resistors on its OE inputs?
No, the SN74CBT16245DGG does not require external biasing on OE inputs. Its TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) allow direct connection to standard logic outputs. However, TI recommends tying unused OE inputs to VCC or GND to prevent floating states that could cause unintended switching or increased ICC.
Can the SN74CBT16245DGG be used to switch analog signals such as audio or sensor outputs?
The SN74CBT16245DGG is specified and characterized for digital bus switching only. While its transmission-gate structure permits analog pass-through, TI does not guarantee performance for analog signals-parameters like THD, SNR, or bandwidth are not characterized. For analog signal routing, dedicated analog switches (e.g., TMUX series) are recommended instead of SN74CBT16245DGG.
What is the meaning of "Standard '16245-Type Pinout" in the SN74CBT16245DGG datasheet?
"Standard '16245-Type Pinout" means the SN74CBT16245DGG uses the identical pin assignment as the legacy 74LS16245 transceiver-enabling drop-in replacement in existing PCB layouts without redesign. This includes matching positions for VCC, GND, OE, and all A/B port signals across the TSSOP-48 footprint, preserving mechanical and electrical compatibility.
How does the SN74CBT16245DGG handle voltage mismatches between A and B ports during switching?
The SN74CBT16245DGG allows voltage differences up to |VA − VB| ≤ 5.5 V when the switch is on, provided both ports remain within −0.5 V to 7 V relative to GND. Its transmission-gate architecture conducts bidirectionally regardless of voltage polarity or magnitude differential, but sustained mismatched DC bias may increase static power dissipation due to ron-limited current flow.
SN74CBT16245DGG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
- -
- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74CBT16245DGG FAQ
1.How can I place an order for SN74CBT16245DGG through Aetrix?
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For technical support, including SN74CBT16245DGG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16245DGG requirements.
6.How does Aetrix verify that SN74CBT16245DGG is sourced from the original manufacturer or authorized distributors?
All SN74CBT16245DGG 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 SN74CBT16245DGG meets industry standards.
7.What is the process for return or replacement of SN74CBT16245DGG?
All SN74CBT16245DGG units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16245DGG, 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 SN74CBT16245DGG part is unused and in its original packaging.
Return procedure for SN74CBT16245DGG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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