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Texas Instruments SN74CBT3244DBR
- Part No.:
- SN74CBT3244DBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBT3244DBR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
SN74CBT3244DBR from Texas Instruments is an octal FET bus switch organized as two independent 4-bit bidirectional low-impedance switches, featuring 5 Ω typical ON-state resistance, 6 pF typical OFF-state I/O capacitance, and 0.25 ns typical propagation delay-enabling high-speed signal routing in microprocessor-peripheral interconnects.
For engineers reviewing the SN74CBT3244DBR datasheet, SN74CBT3244DBR pinout, SN74CBT3244DBR application, or SN74CBT3244DBR equivalent, key selection criteria include TTL/CMOS-compatible control inputs, 0–5 V data-level support, active-low OE control per switch bank, and SSOP-20 package compatibility with standard '244 pinout layouts.
Technical Context
The SN74CBT3244DBR implements dual 4-bit FET-based analog switches with separate active-low output-enable (1OE, 2OE) controls. Each switch channel provides near-zero propagation delay and bidirectional signal flow without direction pins or level-shifting circuitry.
Its architecture relies on voltage-controlled MOSFET pass gates biased by VCC (4.5–5.5 V), delivering flat ron over temperature and supporting mixed-voltage signaling (0.8 V to 5 V) across A/B ports while maintaining 50 µA max ICC in quiescent state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 5 Ω typical - ensures minimal voltage drop and signal attenuation at 30 mA channel current |
| Propagation delay (tpd) | 0.25 ns typical - enables reliable operation up to 200 MHz data rates |
| I/O capacitance (Cio(OFF)) | 6 pF typical - reduces capacitive loading and signal distortion on driven buses |
| Supply voltage range | 4.5 V to 5.5 V - compatible with standard 5 V TTL systems and tolerant of supply ripple |
| Control input logic | Active-low OE with VIH ≥ 2 V / VIL ≤ 0.8 V - interoperable with both TTL and 3.3 V/5 V CMOS drivers |
| Signal voltage range | 0 V to 5 V on all I/O pins - supports multi-voltage domain interfacing without external level shifters |
| Quiescent current (ICC) | 50 µA maximum - minimizes standby power in always-on system monitoring paths |
Pinout & Package
SN74CBT3244DBR uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 5.80 mm × 8.55 mm body size, and 2 mm max height per JEDEC MO-150. Pin 1 index is marked via corner chamfer and mold flash indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable for Bank 1 (pins 2,4,6,8 ↔ 18,16,14,12) and Bank 2 (pins 11,13,15,17 ↔ 9,7,5,3) |
| 2,4,6,8 | 1A1–1A4 | Bank 1 A-side bidirectional I/Os - connect to microprocessor or controller data lines |
| 11,13,15,17 | 2A1–2A4 | Bank 2 A-side bidirectional I/Os - used for secondary peripheral or memory interface |
| 18,16,14,12 | 1B1–1B4 | Bank 1 B-side bidirectional I/Os - route to external bus, test point, or isolation node |
| 9,7,5,3 | 2B1–2B4 | Bank 2 B-side bidirectional I/Os - support parallel diagnostics or redundant path switching |
| 10 | GND | Ground reference for all internal FET biasing and signal return paths |
| 20 | VCC | Positive supply input - powers internal gate drive and defines logic threshold for OE inputs |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | No direction control required; signals propagate equally from A→B or B→A with sub-nanosecond tpd |
| TTL/CMOS-compatible OE inputs | Accepts 0.8 V low / 2 V high thresholds - eliminates need for level translators when driven by legacy 5 V or modern 3.3 V controllers |
| Multi-voltage I/O tolerance | Supports 0–5 V signaling on all A/B pins regardless of VCC - enables safe interfacing between 1.8 V, 2.5 V, 3.3 V, and 5 V subsystems |
| Low capacitive loading | 6 pF Cio(OFF) minimizes stub effects and maintains signal integrity on high-speed buses up to 200 MHz |
| Standard '244 pinout | Pin-compatible with industry-standard octal buffer footprints - allows drop-in replacement in existing PCB layouts |
Applications
| Test Equipment Signal Routing | Microprocessor Peripheral Multiplexing |
|---|---|
Use Scenario: Switching DUT signals between multiple measurement instruments (oscilloscope, logic analyzer, DMM) in automated test fixtures. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling dynamic reconfiguration of probe paths without signal degradation or timing skew. Use Value: 5 Ω ron and 0.25 ns tpd preserve edge fidelity and timing margins during high-frequency digital signal capture. |
Use Scenario: Sharing a single 8-bit data bus between CPU, EEPROM, and FPGA on embedded control boards with limited trace count. IC Role / Device Role / Timing Role: Dual-bank bus switch isolating conflicting peripherals while maintaining synchronous access under software control. Use Value: Independent 1OE/2OE enables selective activation of memory vs. I/O banks without bus contention or hold-time violations. |
| Factory Automation I/O Expansion | Legacy System Voltage Translation |
Use Scenario: Adding isolated digital I/O channels to PLC backplanes where field devices operate at varying logic levels (24 V, 5 V, 3.3 V). IC Role / Device Role / Timing Role: Level-agnostic signal conduit between programmable logic and sensor/actuator interfaces. Use Value: 0–5 V I/O tolerance allows direct connection to optocoupler outputs or RS-485 transceivers without external level shifters. |
Use Scenario: Interfacing modern 3.3 V SoCs with legacy 5 V peripherals (e.g., UART-to-RS232, SPI ADCs) in industrial gateways. IC Role / Device Role / Timing Role: Passive voltage-domain bridge preserving signal timing and reducing component count versus active translators. Use Value: Flat ron and low Cio(OFF) prevent rise/fall time degradation and maintain setup/hold timing across mixed-voltage clock domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DBR | 10-bit configuration with 3-state outputs and higher ron (7 Ω typ); requires VCC = 5 V only | Designed for address/data bus isolation with tristate capability - not suitable for continuous bidirectional pass-through | Select when needing tristate control or wider bus width; avoid if sub-nanosecond tpd or 0–5 V I/O tolerance is critical |
| 74LVC244APW | Octal non-inverting buffer with 3-state outputs; no bidirectional switching; ron not specified | Provides direction-controlled buffering only - cannot replace bidirectional signal routing function of SN74CBT3244DBR | Choose only for unidirectional fanout expansion; not a functional substitute for bus switching or voltage-domain bridging |
Compared with SN74CBT3244DBR, SN74CBTD3384DBR adds tristate capability but sacrifices speed and voltage flexibility, while 74LVC244APW offers logic-level buffering without true analog switching behavior - neither replicates the low-ron, zero-delay, bidirectional, multi-voltage operation central to SN74CBT3244DBR's design role.
Availability
SN74CBT3244DBR is available at Aetrix Electronics and suitable for test and measurement systems, factory automation control boards, and building automation control boards requiring stable component supply and long-term obsolescence management.
Supply support for SN74CBT3244DBR 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 company specializing in analog and embedded processing solutions, with leadership in precision analog, power management, and high-speed interface technologies.
The SN74CBT3244DBR belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered for high-bandwidth, low-latency digital signal routing in test equipment, industrial control, and communications infrastructure.
FAQ
What is the maximum operating frequency supported by the SN74CBT3244DBR?
The SN74CBT3244DBR supports signal switching up to 200 MHz, validated by its 0.25 ns typical propagation delay and 5 Ω typical ON-state resistance. This performance assumes proper PCB layout with controlled impedance traces, minimal stub length, and adequate bypassing (0.1 µF ceramic capacitor at VCC pin). Frequency capability may decrease with increased load capacitance or trace inductance.
Can the SN74CBT3244DBR interface between 3.3 V and 5 V logic domains?
Yes, the SN74CBT3244DBR supports 0–5 V signaling on all A/B I/O pins regardless of VCC (4.5–5.5 V), making it suitable for bidirectional level translation between 3.3 V and 5 V subsystems. No external level shifters are needed, and the device maintains signal integrity due to low 6 pF OFF-state capacitance and flat 5 Ω ON-resistance.
Is the SN74CBT3244DBR pin-compatible with standard '244 devices?
Yes, the SN74CBT3244DBR uses the industry-standard '244 pinout in its SSOP-20 package, matching pin-for-pin with legacy octal buffers like SN74LS244. This allows direct PCB footprint reuse in upgrades from TTL/CMOS buffers to high-speed FET bus switches without layout changes.
What is the recommended power supply decoupling for the SN74CBT3244DBR?
A 0.1 µF ceramic capacitor must be placed between VCC (pin 20) and GND (pin 10), located as close as possible to the SN74CBT3244DBR package. This minimizes supply noise and prevents switching-induced ground bounce. TI specifies this value in Section 9.2.1 and Figure 4 of the datasheet SCDS001O.
How does the output-enable logic work on the SN74CBT3244DBR?
The SN74CBT3244DBR features two active-low output-enable inputs: 1OE (pin 1) controls Bank 1 (1A1–1A4 ↔ 1B1–1B4), and 2OE (pin 19) controls Bank 2 (2A1–2A4 ↔ 2B1–2B4). When OE is low, the corresponding A/B ports are connected; when high, they are isolated. To ensure high-impedance state at power-up, tie OE pins to VCC via pullup resistors.
SN74CBT3244DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 2
- 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:
- 20-SSOP
SN74CBT3244DBR FAQ
1.How can I place an order for SN74CBT3244DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3244DBR 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 SN74CBT3244DBR reliable?
The price and inventory of SN74CBT3244DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3244DBR is usually 5 days.
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Once your SN74CBT3244DBR 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 SN74CBT3244DBR?
For technical support, including SN74CBT3244DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3244DBR requirements.
6.How does Aetrix verify that SN74CBT3244DBR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3244DBR 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 SN74CBT3244DBR meets industry standards.
7.What is the process for return or replacement of SN74CBT3244DBR?
All SN74CBT3244DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3244DBR, 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 SN74CBT3244DBR part is unused and in its original packaging.
Return procedure for SN74CBT3244DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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