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
- Price
- From $0.8370(MOQ 20)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74ACT540E?
- 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
What is CD74ACT540E used for?
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.
What are the specifications of CD74ACT540E?
| 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 |
Where can I find the CD74ACT540E datasheet?
CD74ACT540E Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74ACT540E?
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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Why Buy from FindMyChip
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.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 20+ | $1.4300 | $28.60 |
| 1000+ | $1.1200 | $1120.00 |
| 2500+ | $1.1000 | $2750.00 |
| 5000+ | $1.0700 | $5350.00 |
| 10000+ | $0.9990 | $9990.00 |
| 100000+ | $0.8370 | $83700.00 |
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