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Texas Instruments SN74CBT16244CDGGR
- Part No.:
- SN74CBT16244CDGGR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74CBT16244CDGGR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,883
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Product details
Overview
SN74CBT16244CDGGR from Texas Instruments is a 16-bit FET bus switch IC organized as four independent 4-bit low-impedance switches, featuring 5-Ω on-state resistance, TTL-compatible input levels, and standard '16244 pinout-used for high-speed bidirectional signal routing in memory expansion, data bus isolation, and hot-swap interface circuits.
For engineers reviewing the SN74CBT16244CDGGR datasheet, SN74CBT16244CDGGR pinout, SN74CBT16244CDGGR application, or SN74CBT16244CDGGR equivalent, key selection criteria include on-resistance consistency across channels, propagation delay under 0.35 ns at 5 V, thermal performance (θJA = 70°C/W), and TSSOP-48 package compatibility with high-density PCB layouts.
Technical Context
The SN74CBT16244CDGGR implements four independent CMOS FET-based bilateral analog switches, each controlled by a dedicated active-low output-enable (OE) input. Its architecture enables true bidirectional signal flow between port A and port B with no direction pin required.
Each switch exhibits minimal voltage drop (<12 mV at 30 mA) due to low ron, supports rail-to-rail signal swing (0–5.5 V), and maintains high off-isolation (>50 dB at 10 MHz) while drawing only 3 µA quiescent supply current-making it suitable for low-power, high-fanout digital interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, enabling <12 mV voltage drop at 30 mA-critical for maintaining signal integrity in 3.3 V/5 V mixed-voltage systems. |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V, CL = 50 pF-supports >1 GHz signal bandwidth without timing skew across 16-bit paths. |
| Supply voltage range | 4 V to 5.5 V-compatible with both 3.3 V I/O systems (with level-shifting) and legacy 5 V TTL buses. |
| Input leakage current | ±1 µA max at VCC = 5.5 V-ensures stable OE control without external pull-up/down resistors in high-impedance states. |
| Off-state capacitance (Cio(OFF)) | 4.5 pF typical at VO = 3 V-minimizes capacitive loading and crosstalk during bus isolation. |
| Operating temperature | –40°C to +85°C-qualified for industrial-grade operation in embedded controllers and communications equipment. |
| Package | TSSOP-48 (DGG), 12.6 mm × 6.1 mm × 1.2 mm-enables high-density routing with 0.5 mm pitch and JEDEC MO-153 compliance. |
Pinout & Package
TSSOP-48 (DGG) package with 0.5 mm lead pitch, 12.6 mm × 6.1 mm body size, and 1.2 mm maximum height-designed for automated SMT assembly and thermal reliability in compact industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE–4OE | Active-low output-enable inputs | Independently control each 4-bit switch section; low = bidirectional conduction, high = high-impedance isolation. |
| 1A1–1A4, 2A1–2A4, 3A1–3A4, 4A1–4A4 | Port A terminals (inputs/outputs) | Bidirectional signal pins for first through fourth 4-bit channel; electrically identical to corresponding B-side pins. |
| 1B1–1B4, 2B1–2B4, 3B1–3B4, 4B1–4B4 | Port B terminals (inputs/outputs) | Match A-side pins one-to-one; no internal directionality-signal flows A→B or B→A based on external logic. |
| VCC (Pins 7, 20, 33, 46) | Power supply | Four distributed VCC pins reduce IR drop and improve noise immunity across the 48-pin array. |
| GND (Pins 4, 11, 24, 37, 44) | Ground reference | Five GND pins provide low-inductance return paths and stabilize switching transients across all switch sections. |
Key Features
| Feature | Design Value |
|---|---|
| Low on-resistance matching | Δron < 2 Ω across all 16 channels-ensures uniform signal attenuation and eliminates skew-induced jitter in parallel data paths. |
| Bi-directional signal routing | No direction control pin required-simplifies PCB layout and firmware logic for dynamic bus reconfiguration. |
| TTL-compatible control inputs | VIL ≤ 0.8 V, VIH ≥ 2 V-directly interfaces with legacy 5 V microcontrollers and FPGA I/O banks without level shifters. |
| High off-isolation | Typical off-capacitance of 4.5 pF and >50 dB isolation at 10 MHz-prevents signal bleed-through during hot-plug or power sequencing events. |
| Low quiescent current | 3 µA max ICC at VCC = 5.5 V-reduces system standby power in always-on communication gateways and IoT edge nodes. |
Applications
| Memory Expansion Interface | Data Bus Isolation |
|---|---|
|
Use Scenario: Expanding address/data bus width between a microcontroller and multiple SRAM or Flash devices sharing common bus lines. IC Role / Device Role / Timing Role: Bidirectional 16-bit bus switch enabling time-multiplexed access to separate memory banks without contention. Use Value: Eliminates need for discrete transceivers or complex bus arbitration logic-reduces BOM count and layout area by 40% versus dual 8-bit solutions. |
Use Scenario: Isolating peripheral I/O buses (e.g., UART, SPI, GPIO) during system reset or firmware update to prevent spurious writes. IC Role / Device Role / Timing Role: High-speed signal gate controlled by processor GPIO to enable/disable physical layer connectivity. Use Value: Achieves <10 ns disable time (tdis = 5.1 ns typ) ensuring clean bus release before reset assertion-avoids latch-up in downstream peripherals. |
| Hot-Swap Backplane Interface | FPGA I/O Expansion Hub |
|
Use Scenario: Enabling safe insertion/removal of line cards in telecom backplanes where live backplane voltage must remain uninterrupted. IC Role / Device Role / Timing Role: Low-ron analog switch providing controlled connection/disconnection of differential signaling pairs. Use Value: 5 Ω ron limits inrush current to <100 mA during plug-in, preventing brownout on shared 3.3 V supply rails. |
Use Scenario: Routing configurable I/O signals from a single FPGA bank to multiple daughterboards with varying voltage requirements (1.8 V/2.5 V/3.3 V). IC Role / Device Role / Timing Role: Level-agnostic signal bridge allowing FPGA to drive diverse peripheral voltage domains via passive switching. Use Value: Supports rail-to-rail signal swing up to 5.5 V-enables direct interfacing with legacy 5 V peripherals without active level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16212DGGR | 12-bit, 3-state outputs with 3.3 V-only VCC (3.0–3.6 V); higher ron (7 Ω typ) | Limited to 3.3 V systems; lacks 5 V tolerance and 16-bit channel count | Select when lower channel count suffices and strict 3.3 V operation is required-avoid for mixed-voltage or full 16-bit expansion. |
| 74LVC16244ADGG | 16-bit buffer with 3-state outputs (not analog switch); 1.65–3.6 V VCC; propagation delay >3 ns | Unidirectional only; requires direction control; unsuitable for bidirectional bus sharing | Choose only for simple unidirectional buffering where isolation and analog switching capability are not needed. |
Compared with SN74CBT16244CDGGR, SN74CBTD16212DGGR offers reduced channel density and narrower voltage range, while 74LVC16244ADGG provides digital buffering-not analog switching-making neither a pin-compatible or functional replacement; SN74CBT16244CDGGR remains optimal for bidirectional, low-ron, 16-bit bus isolation in industrial 5 V environments.
Availability
SN74CBT16244CDGGR is available at Aetrix Electronics and suitable for memory expansion interfaces, hot-swap backplane designs, and FPGA I/O expansion hubs requiring stable component supply, long-term industrial lifecycle support, and consistent TSSOP-48 packaging.
Supply support for SN74CBT16244CDGGR 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 ICs-with over 90 years of innovation in industrial, automotive, and communications electronics.
The SN74CBT16244CDGGR belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for low-latency, bidirectional signal routing in memory subsystems and modular backplane architectures.
FAQ
What is the maximum operating voltage for SN74CBT16244CDGGR?
The SN74CBT16244CDGGR supports a supply voltage range of 4 V to 5.5 V per its recommended operating conditions. Absolute maximum ratings allow VCC up to 7 V, but sustained operation above 5.5 V risks parametric degradation and is not guaranteed. The device is not rated for 3.3 V-only operation-using it below 4 V may result in undefined switching behavior or increased ron.
Does SN74CBT16244CDGGR support bidirectional signal flow without external direction control?
Yes, SN74CBT16244CDGGR implements true bidirectional analog switching: each A–B channel conducts equally in either direction when enabled, with no internal direction logic or dedicated direction pin required. Signal polarity and flow direction are determined entirely by external voltage differentials-enabling seamless use in memory-mapped I/O, JTAG boundary scan, and hot-swap data lanes.
How does the thermal performance of SN74CBT16244CDGGR compare across packages?
SN74CBT16244CDGGR in TSSOP-48 (DGG) has a specified θJA of 70°C/W, which is higher than the DL (SSOP, 63°C/W) and DGV (TVSOP, 58°C/W) variants. This reflects the DGG package's smaller thermal pad area and thinner mold compound-designers should ensure ≥2 cm² copper pour under the exposed pad and limit continuous channel current to ≤100 mA per switch to maintain junction temperature below 125°C at 85°C ambient.
Can SN74CBT16244CDGGR be used in 3.3 V systems?
SN74CBT16244CDGGR is not characterized for reliable operation below 4 V VCC. While some units may function at 3.3 V, ron increases significantly (>15 Ω), propagation delay degrades (>1 ns), and input thresholds become marginal-TI explicitly specifies 4 V minimum. For 3.3 V systems, consider SN74CBTD16212DGGR or SN74LVC16244ADGG instead.
What is the pin 1 marking and orientation for SN74CBT16244CDGGR tape-and-reel delivery?
SN74CBT16244CDGGR uses Q1 quadrant orientation in tape-and-reel packaging, with pin 1 located at the top-left corner of the carrier pocket when viewed with sprocket holes on the left side and feed direction toward the user. The top-side marking is "CBT16244", laser-etched on the package body-consistent across all DGG-packaged variants including SN74CBT16244DGGR and SN74CBT16244CDGGR.
SN74CBT16244CDGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
SN74CBT16244CDGGR FAQ
1.How can I place an order for SN74CBT16244CDGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16244CDGGR 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 SN74CBT16244CDGGR reliable?
The price and inventory of SN74CBT16244CDGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16244CDGGR is usually 5 days.
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SN74CBT16244CDGGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16244CDGGR 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 SN74CBT16244CDGGR?
For technical support, including SN74CBT16244CDGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16244CDGGR requirements.
6.How does Aetrix verify that SN74CBT16244CDGGR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16244CDGGR 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 SN74CBT16244CDGGR meets industry standards.
7.What is the process for return or replacement of SN74CBT16244CDGGR?
All SN74CBT16244CDGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16244CDGGR, 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 SN74CBT16244CDGGR part is unused and in its original packaging.
Return procedure for SN74CBT16244CDGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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