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Texas Instruments SN74CBT3244PWRE4
- Part No.:
- SN74CBT3244PWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3244PWRE4.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,585
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Product details
Overview
SN74CBT3244PWRE4 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, 200 MHz bandwidth support, and TTL/CMOS-compatible control inputs. It enables high-speed signal routing between microprocessor buses and peripherals in test equipment and factory automation control boards.
For engineers reviewing the SN74CBT3244PWRE4 datasheet, SN74CBT3244PWRE4 pinout, SN74CBT3244PWRE4 application, or SN74CBT3244PWRE4 equivalent, key selection criteria include its 5 Ω ron, 6 pF off-state I/O capacitance, active-low dual OE control, bidirectional zero-delay switching, and TSSOP-20 package compatibility with standard '244 pinout.
Technical Context
The SN74CBT3244PWRE4 implements eight independent analog/digital signal paths using NMOS pass-gate FETs, each controlled by one of two active-low output-enable (OE) inputs - 1OE for bits A1–A4/B1–B4 and 2OE for A1–A4/B1–B4 on the second group. Its near-zero propagation delay (0.25 ns typical) arises from low ron and minimal parasitic capacitance.
It operates strictly within 4.5 V to 5.5 V VCC, supports 0–5 V data signaling across all I/Os regardless of VCC level, and draws ≤50 µA ICC in quiescent state. The device is not level-shifting: voltage translation is unsupported; it passes signals within the same domain with rail-to-rail tolerance up to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - defines minimum supply headroom for reliable TTL/CMOS input recognition and switch conduction |
| ron (Typical) | 5 Ω - ensures minimal voltage drop and signal attenuation at 30 mA channel current |
| Cio(OFF) | 6 pF - limits capacitive loading on driven nets during high-impedance state, preserving signal integrity |
| Propagation Delay | 0.25 ns - enables clean 200 MHz digital signal switching without timing skew accumulation |
| Control Input Logic | Active-low OE - simplifies interface with standard microcontroller GPIO or address decoders without inverters |
| Signal Voltage Range | 0 V to 5 V - allows interoperability with 1.8 V, 2.5 V, 3.3 V, and 5 V logic families on I/O pins |
| ICC (Max) | 50 µA - reduces static power budget impact in always-on system monitoring or configuration paths |
Pinout & Package
TSSOP-20 package (5.00 mm × 4.40 mm body, 1.2 mm max height), lead pitch 0.65 mm, JEDEC MO-153 compliant, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for first 4-bit switch group (1A1–1A4 ↔ 1B1–1B4); tie high for default isolation |
| 2 | 1A1 | Input/output terminal of first switch channel; bidirectional path when 1OE = low |
| 4 | 1A2 | Input/output terminal of second switch channel in Group 1 |
| 6 | 1A3 | Input/output terminal of third switch channel in Group 1 |
| 8 | 1A4 | Input/output terminal of fourth switch channel in Group 1 |
| 18 | 1B1 | Complementary I/O terminal paired with 1A1; forms full-duplex path under 1OE control |
| 16 | 1B2 | Complementary I/O terminal paired with 1A2 |
| 14 | 1B3 | Complementary I/O terminal paired with 1A3 |
| 12 | 1B4 | Complementary I/O terminal paired with 1A4 |
| 19 | 2OE | Active-low enable for second 4-bit switch group (2A1–2A4 ↔ 2B1–2B4) |
| 11 | 2A1 | Input/output terminal of first channel in Group 2 |
| 13 | 2A2 | Input/output terminal of second channel in Group 2 |
| 15 | 2A3 | Input/output terminal of third channel in Group 2 |
| 17 | 2A4 | Input/output terminal of fourth channel in Group 2 |
| 9 | 2B1 | Complementary I/O terminal paired with 2A1 |
| 7 | 2B2 | Complementary I/O terminal paired with 2A2 |
| 5 | 2B3 | Complementary I/O terminal paired with 2A3 |
| 3 | 2B4 | Complementary I/O terminal paired with 2A4 |
| 10 | GND | Power return reference for internal circuitry and switch substrate bias |
| 20 | VCC | Positive supply input; bypass capacitor required per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | 0.25 ns tpd enables transparent signal coupling without added latency or phase shift |
| Low flat ON-resistance | 5 Ω typical ron over temperature ensures consistent signal amplitude and rise/fall times |
| Ultra-low I/O capacitance | 6 pF Cio(OFF) minimizes stub loading and reflection in high-speed parallel bus traces |
| 5-V/3.3-V/1.8-V tolerant I/Os | Supports mixed-voltage board design without external level translators on data lines |
| Standard '244 pinout | Enables drop-in replacement of legacy 74-series buffers in existing layouts and test fixtures |
Applications
| Multi-Processor Communications | Test and Measurement Systems |
|---|---|
|
Use Scenario: Isolating shared address/data buses between two microprocessors during concurrent memory access or debug operations. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed arbitration without signal degradation or timing skew. Use Value: Eliminates need for direction-control logic and reduces PCB layer count versus discrete buffer solutions. |
Use Scenario: Routing stimulus signals from arbitrary waveform generators to multiple DUT inputs while maintaining signal fidelity. IC Role / Device Role / Timing Role: Low-capacitance, low-ron signal path selector supporting >100 MHz analog and digital test patterns. Use Value: Preserves edge rate and amplitude integrity due to 6 pF Cio(OFF) and 5 Ω ron, critical for jitter-sensitive measurements. |
| Factory Automation Control Boards | Building Automation Control Boards |
|
Use Scenario: Dynamically connecting PLC I/O modules to fieldbus transceivers based on operational mode or diagnostics. IC Role / Device Role / Timing Role: Dual-group OE-controlled switch providing isolated signal paths for redundant communication channels. Use Value: Enables hot-swap-safe reconfiguration via software-controlled OE pins without bus contention. |
Use Scenario: Sharing sensor data lines (e.g., temperature, occupancy) among HVAC controllers, lighting systems, and security panels. IC Role / Device Role / Timing Role: Low-power (50 µA ICC) bus multiplexer allowing always-on monitoring with minimal standby draw. Use Value: Reduces system-level quiescent current versus discrete MOSFET-based solutions, extending battery backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PWR | 10-bit, dual-supply (1.65–5.5 V), supports level translation; higher ron (7 Ω typ), larger TSSOP-24 package | Required where 3.3 V ↔ 5 V voltage translation is needed; unsuitable for pure 5 V systems needing minimal ron | Choose only if mixed-voltage domain bridging is required; otherwise SN74CBT3244PWRE4 offers lower ron and smaller footprint. |
| 74LVC244APW,118 | Octal non-inverting buffer with 3-state outputs; unidirectional, no bidirectional capability; 3.3 V only (1.65–3.6 V) | Applicable only in fixed-direction, single-supply 3.3 V systems; cannot replace bidirectional bus switching function | Select only for simple 3.3 V output buffering; SN74CBT3244PWRE4 remains necessary for bidirectional 5 V bus isolation. |
Compared with SN74CBT3244PWRE4, SN74CBTD3384PWR adds level translation but increases ron and package size, while 74LVC244APW,118 lacks bidirectionality and 5 V operation - making SN74CBT3244PWRE4 the optimal choice for high-fidelity, low-latency 5 V bus switching.
Availability
SN74CBT3244PWRE4 is available at Aetrix Electronics and suitable for multi-processor communications, test and measurement instrumentation, and factory automation control boards requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT3244PWRE4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SN74CBT3244PWRE4 belongs to TI's CBT (Crossbar Bus Technology) family, designed specifically for high-bandwidth, low-latency bidirectional bus switching in real-time control and instrumentation systems.
FAQ
What is the maximum operating frequency supported by the SN74CBT3244PWRE4?
The SN74CBT3244PWRE4 supports signal switching up to 200 MHz, enabled by its 5 Ω typical ON-state resistance and 6 pF off-state I/O capacitance. This bandwidth assumes proper PCB layout with controlled impedance traces and minimal stub length; actual usable frequency may decrease with added trace capacitance or series resistance.
Does the SN74CBT3244PWRE4 support voltage level translation between different logic families?
No, the SN74CBT3244PWRE4 does not perform voltage level translation. It is a passive bidirectional switch that passes signals within the same voltage domain. While its I/Os tolerate 0–5 V regardless of VCC (set to 4.5–5.5 V), it cannot convert 3.3 V logic to 5 V or vice versa - the signal voltage at A and B terminals must remain within the same range.
What is the recommended bypass capacitor for the SN74CBT3244PWRE4 VCC pin?
A 0.1-µF ceramic bypass capacitor is recommended between the VCC (pin 20) and GND (pin 10) pins of the SN74CBT3244PWRE4, placed as close as possible to the device. This mitigates supply noise and ensures stable switching performance, especially at high frequencies up to 200 MHz.
Can unused channels on the SN74CBT3244PWRE4 be left floating?
No, unused I/O channels on the SN74CBT3244PWRE4 must be tied to a defined logic level - either VCC or GND - to prevent floating nodes that could cause increased ICC, EMI, or unpredictable switching behavior. TI recommends pulling unused A or B pins to VCC or GND via resistors or direct connection.
Is the SN74CBT3244PWRE4 pin-compatible with standard 74LS244 or 74HC244 devices?
Yes, the SN74CBT3244PWRE4 uses the industry-standard '244 pinout in its TSSOP-20 package, matching pin-for-pin the 74LS244 and 74HC244 in SOIC-20. However, functional differences exist: SN74CBT3244PWRE4 is bidirectional with active-low OE, whereas '244 devices are unidirectional 3-state buffers - direct replacement requires circuit-level validation.
SN74CBT3244PWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-TSSOP
SN74CBT3244PWRE4 FAQ
1.How can I place an order for SN74CBT3244PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3244PWRE4 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 SN74CBT3244PWRE4 reliable?
The price and inventory of SN74CBT3244PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3244PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74CBT3244PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3244PWRE4 transactions.
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4.How is shipping managed for SN74CBT3244PWRE4?
SN74CBT3244PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3244PWRE4 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 SN74CBT3244PWRE4?
For technical support, including SN74CBT3244PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3244PWRE4 requirements.
6.How does Aetrix verify that SN74CBT3244PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3244PWRE4 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 SN74CBT3244PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3244PWRE4?
All SN74CBT3244PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3244PWRE4, 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 SN74CBT3244PWRE4 part is unused and in its original packaging.
Return procedure for SN74CBT3244PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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