SN74CBT3244PWE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
8-bit TTL-compatible CMOS bus switch with active-low enable, featuring 2 independent 4-bit elements in a 20-pin TSSOP package. Unidirectional bus switching with 50 pF load capacitance and near-zero propagation delay. Available from Texas Instruments with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74CBT3244PWE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit bidirectional bus switch split as 2 independent 4-bit elements with individual active-low enable controls
- Near-zero propagation delay for transparent bus connection, unlike buffered logic gates
- TTL-compatible inputs and outputs ensuring direct interfacing with 5 V and 3.3 V logic buses
- 20-pin TSSOP package with RoHS e4 compliance for space-efficient PCB routing in data buses
Applications
The SN74CBT3244PWE4 is used for bus isolation, data multiplexing, and address switching in microprocessor systems, memory interfaces, and backplane designs operating on 3.3 V or 5 V logic rails. Its near-zero propagation delay makes it ideal for time-critical bus arbitration in embedded processors, DSPs, and FPGA-based systems where signal latency must be minimized.
Specifications
| YTEOL | 0 |
| Additional Feature | TTL COMPATIBLE BUS SWITCH |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | CBT/FST/QS/5C/B |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP20,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.05mA |
| Prop. Delay@Nom-Sup | 0.25ns |
| Propagation Delay (tpd) | 0.25ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74CBT3244PWE4:
Bus Driver, CBT/FST/QS/5C/B Series, 2-Func, 5-Bit, True Output, CMOS, PDSO24
Bus Driver, CBT/FST/QS/5C/B Series, 2-Func, 1-Bit, True Output, CMOS, PDSO8
Frequently Asked Questions
How does the SN74CBT3244PWE4 differ from a standard 74HC244 buffer in bus switching applications?
Unlike the 74HC244, which adds a typical propagation delay of 7 ns to 10 ns, the SN74CBT3244PWE4 is a MOSFET-based bus switch with near-zero propagation delay and bidirectional signal flow. This makes it suitable for transparent bus isolation where signal timing must be preserved across a 3.3 V or 5 V bus operating at 50 pF load.
What enable polarity and control arrangement does the SN74CBT3244PWE4 use?
The device has active-low enable inputs (OE#), with 2 independent control pins each governing a 4-bit element within the 8-bit bus. This dual-element arrangement allows designers to selectively connect or isolate two separate 4-bit data segments on the same physical bus, improving flexibility in address and data multiplexing schemes.
For a 5 V to 3.3 V mixed-voltage system, is the SN74CBT3244PWE4 suitable without level shifting?
The SN74CBT3244PWE4 is TTL-compatible and supports bus voltages up to the supply rail, but it is a passive MOSFET switch rather than a level translator; both sides must share the same nominal voltage (3.3 V or 5 V) without a voltage step. For 5 V to 3.3 V translation, a dedicated level-shifter like the TXB0108 is more appropriate, while the SN74CBT3244PWE4 excels at same-voltage bus isolation at 50 pF loads.
In a densely routed PCB, how many bus signals can the SN74CBT3244PWE4 switch per package?
Each SN74CBT3244PWE4 in its 20-pin TSSOP package handles 8 bus lines, split as two 4-bit groups, covering a full byte of data in a single IC. This integration reduces chip count compared to using dual 74CBT3125 4-bit switches, saving PCB area in memory controllers, DSP data buses, and FPGA I/O expansion circuits.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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