CD74HC540E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
CD74HC540E is a high-speed CMOS octal inverting bus buffer and line driver from Texas Instruments, featuring 8 inverting 3-state outputs, dual active-low output-enable pins, 50 pF load drive, and housed in a 20-pin DIP package. From $0.60 in stock worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- CD74HC540E 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 inverting 3-state outputs with dual active-low output-enable control for flexible bus-sharing and multiplexed data path designs
- HC/UH CMOS family operation from 2 V to 6 V supply with high-speed propagation delay under 10 ns at 5 V
- Drives 50 pF capacitive loads at full CMOS voltage swings, compatible with both 3.3 V and 5 V logic systems
Applications
The CD74HC540E is used in microprocessor data bus buffering, memory address demultiplexing, and backplane data-path isolation in embedded systems and industrial controllers. Its dual output-enable inputs allow two independent bus-enable sources to control all 8 output channels, simplifying arbitration logic in multi-master bus architectures. Test equipment, FPGA prototyping boards, and legacy TTL replacement designs also rely on the CD74HC540E for level-compatible, 3-state line driving with inverting logic.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | WITH DUAL OUTPUT ENABLE |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | HC/UH |
| JESD-30 Code | R-PDIP-T20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.006A |
| 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 | 33ns |
| Propagation Delay (tpd) | 165ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| 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 |
| ## CD74HC540E Alternates Showing results | Image |
| 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
Compatible alternatives and drop-in replacements for CD74HC540E:
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Frequently Asked Questions
How does the dual output-enable feature of CD74HC540E simplify multi-master bus designs?
CD74HC540E has two independent active-low output-enable pins (OE1 and OE2), both of which must be low to enable the 8 outputs. This wired-AND enable logic lets two independent bus masters each assert their own OE signal, preventing bus contention without external gate logic and reducing component count in 8-bit multi-master systems.
What propagation delay and supply voltage does CD74HC540E support in a 5 V logic system?
Operating at 5 V supply, CD74HC540E achieves typical propagation delays below 10 ns and guaranteed maximum delays of approximately 14 ns at 50 pF load, comfortably supporting bus clock frequencies above 30 MHz. The device operates from 2 V to 6 V, making it backward-compatible with 3.3 V and 5 V CMOS logic families.
Which bus architectures benefit most from CD74HC540E as a line driver?
Microprocessor address and data buses operating at 8-bit width, ISA-style backplanes, and SRAM/DRAM address demultiplexers benefit most from CD74HC540E. The device drives up to 50 pF capacitive loads per channel and absorbs bus current surges, extending signal integrity across board-to-board connectors in industrial control systems and embedded computing platforms.
How does the 20-pin DIP package of CD74HC540E compare to equivalent SOIC packages for prototyping?
The 20-pin through-hole DIP package with 2.54 mm pitch is ideal for breadboard and perfboard prototyping, while the equivalent CD74HC540M SOIC-20 package measures roughly 12.8 mm × 7.5 mm and saves about 50% PCB footprint in production designs. Both packages offer identical electrical performance including the 50 pF load drive and 3-state output characteristics.
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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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