CD74ACT540E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The CD74ACT540E is an octal inverting buffer and line driver from Texas Instruments in a 20-pin PDIP package, featuring 3-state outputs with dual active-low output enable controls and 50 pF load drive capability. Operating in the ACT family, it is designed for bus interfacing, data isolation, and signal buffering in 5 V digital systems including memory, processor, and FPGA boards.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- CD74ACT540E Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-channel inverting buffer with 3-state outputs
- Dual active-low output enable for bus sharing
- ACT family: TTL-compatible inputs, CMOS outputs
- 50 pF load capacitance drive specification
- Unidirectional data flow for bus isolation
- 20-pin PDIP package for through-hole assembly
Applications
The CD74ACT540E is used in memory address and data bus expansion circuits on 5 V processor boards where multiple devices share a common bus and must be individually enabled or disabled using active-low select signals. It also serves in FPGA prototyping platforms and industrial control cards to buffer and invert 8-bit parallel data paths, protecting sensitive logic inputs from capacitive loading.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | WITH DUAL OUTPUT ENABLE |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | ACT |
| JESD-30 Code | R-PDIP-T20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.024A |
| Number of Bits | 8 |
| Number of Functions | 8 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 7.2ns |
| Propagation Delay (tpd) | 6.5ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How do the dual output enable pins on the CD74ACT540E work in a shared bus design?
The CD74ACT540E has 2 independent active-low output enable inputs (OE1 and OE2) that must both be asserted low simultaneously to drive the 8 outputs. When either enable is deasserted high, all 8 outputs enter the high-impedance 3-state condition, allowing multiple driver devices to share a single 8-bit bus without contention.
What logic family does the CD74ACT540E belong to and how does this affect input thresholds?
The CD74ACT540E belongs to the ACT (Advanced CMOS with TTL-compatible inputs) logic family, which accepts standard TTL input thresholds of approximately 0.8 V low and 2.0 V high while delivering CMOS-level outputs near the 5 V rail. This makes it directly compatible with both TTL and CMOS signal sources in 5 V mixed-logic systems without level-shifting resistors.
For a 50 MHz address bus application, is the CD74ACT540E fast enough?
ACT family propagation delays are typically 5 ns to 7 ns at 5 V with a 50 pF load, which comfortably supports clock rates up to 50 MHz for registered bus transfers and meets setup-hold requirements for most 5 V SRAM and DRAM interfaces. The 3-state disable time of roughly 5 ns to 10 ns also allows safe bus arbitration at these frequencies.
Can the CD74ACT540E be used as a level translator between 3.3 V and 5 V logic?
The CD74ACT540E inputs are TTL-compatible, so a 3.3 V source driving 2.4 V high is above the 2.0 V minimum high threshold, making the device functional as a unidirectional 3.3 V to 5 V translator for 8-bit buses. The output swings close to the 5 V supply rail, delivering CMOS-compatible levels required by 5 V CMOS receivers with approximately 4.9 V high output.
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About Texas Instruments
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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