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Texas Instruments CD74HCT4515E
- Part No.:
- CD74HCT4515E
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-DIP (0.600", 15.24mm)
- Datasheet:
-
CD74HCT4515E.pdf
- Description:
- IC DECODER/DEMUX 1X4:16 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,530
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Product details
Overview
CD74HCT4515E from Texas Instruments is a 4-line to 16-line decoder/demultiplexer with input latches, designed for address decoding and data routing in digital systems. It features active-low enable (E), latch-enable (LE) control, 16 active-low outputs (Y0–Y15), 4.5 V to 5.5 V VCC operation, and operates across –55°C to 125°C for industrial and aerospace applications.
For engineers reviewing the CD74HCT4515E datasheet, CD74HCT4515E pinout, CD74HCT4515E application, or CD74HCT4515E equivalent, key selection criteria include latch-controlled input capture, low-active output logic polarity, E-as-data demultiplexing capability, and compatibility with LSTTL/CMOS logic families in high-reliability embedded control systems.
Technical Context
The CD74HCT4515E integrates a 4-bit strobed latch and a binary decoder in a single silicon-gate HCT device. Its latch enables synchronous input sampling on LE falling edge, while the decoder asserts exactly one of sixteen Y outputs low per A0–A3 address code when E is low - all outputs remain high when E is high.
Logic-level compatibility is dual-mode: VIH ≥ 2 V and VIL ≤ 0.8 V ensure direct interfacing with LSTTL, while input leakage ≤ 1 µA supports CMOS system integration. Propagation delays (tpd ≤ 83 ns at –55°C to 125°C, CL = 50 pF) and balanced transition times support stable timing in synchronous bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures robust operation under industrial rail tolerances and eliminates need for external regulation in 5 V systems. |
| Operating Temperature | –55°C to 125°C - qualified for extended-temperature environments including avionics, motor control, and downhole instrumentation. |
| Output Logic Polarity | Active-low (Yx = L when selected) - directly drives LED indicators, N-channel gate enables, or reset inputs without inversion logic. |
| Max Propagation Delay | 83 ns (A0–A3 → Yx, TA = –55°C to 125°C, CL = 50 pF) - supports reliable 10 MHz address decoding in real-time control loops. |
| Input Compatibility | LSTTL-compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) and CMOS-compatible (II ≤ 1 µA) - interoperable with legacy TTL and modern low-power logic families. |
| Quiescent ICC | 160 µA max (TA = –55°C to 125°C) - enables low-static-power operation in battery-backed or thermally constrained modules. |
| Output Drive | ±25 mA per output - sufficient to directly drive small-signal relays, optocouplers, or multiple 74-series inputs without buffers. |
Pinout & Package
CD74HCT4515E is housed in a 24-pin plastic dual-in-line package (PDIP), JEDEC MS-010 compliant, with 0.300-inch body width and through-hole mounting. Pin 12 is GND; pin 24 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LE (Latch Enable) | High enables transparent latch mode; low freezes A0–A3 inputs at last valid state prior to LE↓ - critical for synchronized address capture. |
| 2–5 | A0–A3 (Address Inputs) | Binary-coded 4-bit select lines determining which Y output is asserted low; sampled only when LE is high or on LE↓ edge. |
| 6–9, 10, 11, 13–20, 22, 23 | Y0–Y15 (Outputs) | 16 active-low decoded outputs; exactly one is low when E = L and address is valid; all high when E = H - enables 1-of-16 selection or chip-select generation. |
| 21 | E (Enable) | Active-low chip enable and demultiplexer data input; when used as data input, A0–A3 become address lines - supports dual decoder/demux functionality. |
| 12 | GND | Ground reference for all logic and output stages; must be low-impedance connection to minimize noise coupling into latch/decoder paths. |
| 24 | VCC | Positive supply for internal logic and output drivers; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Latch + Decoder Integration | Eliminates external flip-flop requirements for synchronized address decoding in microcontroller peripheral expansion. |
| Active-Low Output Architecture | Direct interface to reset, interrupt, or enable inputs of downstream ICs (e.g., memory chips, ADCs) without level-shifting components. |
| Wide Temperature Range | Validated operation from –55°C to 125°C enables use in unheated outdoor enclosures, engine compartments, and industrial PLC backplanes. |
| Low Power vs LSTTL | Typical Cpd = 75 pF and ICC ≤ 160 µA reduce static power by >90% compared to equivalent 74LS4515, easing thermal management. |
| Cascadable Enable Logic | E pin serves as both chip select and data input - allows hierarchical decoding (e.g., 4-to-16 → 16-to-256) using minimal interconnect. |
Applications
| Industrial PLC I/O Expansion | Avionics Display Multiplexing |
|---|---|
|
Use Scenario: Expanding a microcontroller's GPIO count to drive 16 discrete solenoid valves in a programmable logic controller cabinet. IC Role / Device Role / Timing Role: Address decoder that selects one of 16 valve driver circuits based on 4-bit port output; LE synchronizes selection to control cycle boundaries. Use Value: Eliminates need for external latching logic, reduces BOM count, and ensures deterministic valve activation timing across temperature extremes. |
Use Scenario: Routing analog video signals from 16 sensor channels to a single display processor in a flight deck multi-function display unit. IC Role / Device Role / Timing Role: Demultiplexer using E as analog switch control line and A0–A3 as channel address; latch holds channel selection during signal settling. Use Value: Enables glitch-free channel switching with sub-100 ns propagation delay stability over –55°C to 125°C ambient range. |
| Automotive Body Control Module | Test Equipment Signal Routing |
|
Use Scenario: Controlling 16 individual LED status indicators on a vehicle dashboard cluster using a single 4-bit MCU port. IC Role / Device Role / Timing Role: Active-low decoder driving LEDs directly; E tied to microcontroller enable signal for power-gating unused sections. Use Value: Reduces PCB area and component count versus discrete transistor arrays while maintaining automotive-grade temperature resilience. |
Use Scenario: Configuring signal paths between DUT pins and measurement instruments in automated test equipment with 16-channel parallel probing. IC Role / Device Role / Timing Role: Latched address decoder selecting one of 16 relay drivers; LE synchronized to test sequence clock for repeatable path setup. Use Value: Guarantees zero-output-glitch transitions during path reconfiguration, preventing false triggering of sensitive DUT inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-to-16 decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT4515N | Same logic function and pinout; identical PDIP-24 package but TI's newer "N" suffix denotes updated assembly/test flow and tighter AC parameter distribution. | No functional change; suitable for new designs requiring latest process consistency and enhanced ESD robustness (HBM > 2 kV). | Select SN74HCT4515N for production builds where long-term supply continuity and margin-critical timing are prioritized. |
| 74AC154PC | 16-output decoder with active-low outputs but no input latch; operates at 3 V to 5.5 V; faster tpd (≤ 10 ns typical at 5 V) but higher ICC (max 4 mA). | Requires external latch for synchronous input capture; better suited for high-speed data acquisition front-ends than control-plane address decoding. | Choose 74AC154PC only when latch functionality is implemented elsewhere and sub-15 ns propagation is mandatory. |
Compared with CD74HCT4515E, SN74HCT4515N offers improved manufacturing consistency without design changes, while 74AC154PC trades integrated latching for raw speed and wider VCC range - making CD74HCT4515E optimal for cost-sensitive, latch-dependent industrial control where timing margins exceed 80 ns.
Availability
CD74HCT4515E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, avionics display multiplexing, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74HCT4515E 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 leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families.
The CD74HCT4515E belongs to TI's HCT logic series, engineered for seamless LSTTL-to-CMOS migration in industrial, aerospace, and automotive systems where temperature resilience and input compatibility are critical.
FAQ
What is the output logic polarity of the CD74HCT4515E?
The CD74HCT4515E features active-low outputs: when a valid address is applied and E is low, exactly one of Y0–Y15 is driven low; all others remain high. When E is high, all outputs are forced high - this polarity simplifies interface with reset, enable, or LED-anode circuits without external inverters.
How does the latch function work in the CD74HCT4515E?
In the CD74HCT4515E, the latch enable (LE) pin controls input sampling: when LE is high, Y outputs follow A0–A3 in real time; when LE goes low, the current A0–A3 state is captured and held, isolating outputs from subsequent input changes. This enables synchronized address freezing aligned to system clocks or control edges.
Can the CD74HCT4515E be used as a demultiplexer?
Yes - the CD74HCT4515E functions as a 1-to-16 demultiplexer when E is used as the data input and A0–A3 serve as address lines. A low on E routes logic-low data to the selected Y output; a high on E forces all outputs high. This dual-mode operation is explicitly supported in TI's datasheet decode table and logic diagram.
What is the maximum operating temperature for the CD74HCT4515E?
The CD74HCT4515E is rated for continuous operation from –55°C to 125°C, verified per TI's production test conditions. This extended range qualifies it for under-hood automotive, industrial motor drives, and aerospace subsystems where ambient temperatures exceed commercial-grade limits.
Is the CD74HCT4515E pin-compatible with the CD74HCT4514E?
Yes - the CD74HCT4515E and CD74HCT4514E share identical pinout, package (PDIP-24), and timing specifications. The sole functional difference is output polarity: CD74HCT4515E outputs are active-low, while CD74HCT4514E outputs are active-high. This allows direct substitution where logic polarity is managed externally or in firmware.
CD74HCT4515E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 24-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 4:16
- Independent Circuits:
- 1
- Current - Output High, Low:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
CD74HCT4515E FAQ
1.How can I place an order for CD74HCT4515E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT4515E 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 CD74HCT4515E reliable?
The price and inventory of CD74HCT4515E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT4515E is usually 5 days.
3.What payment methods are accepted for CD74HCT4515E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT4515E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT4515E?
CD74HCT4515E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT4515E 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 CD74HCT4515E?
For technical support, including CD74HCT4515E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT4515E requirements.
6.How does Aetrix verify that CD74HCT4515E is sourced from the original manufacturer or authorized distributors?
All CD74HCT4515E 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 CD74HCT4515E meets industry standards.
7.What is the process for return or replacement of CD74HCT4515E?
All CD74HCT4515E units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT4515E, 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 CD74HCT4515E part is unused and in its original packaging.
Return procedure for CD74HCT4515E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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