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Texas Instruments CD54HC147F3A
- Part No.:
- CD54HC147F3A
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54HC147F3A.pdf
- Description:
- HIGH SPEED CMOS LOGIC 10-TO-4 LI
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
CD54HC147F3A from Texas Instruments is a high-speed CMOS 9-input priority encoder performing 10-line-to-4-line active-low encoding with decimal zero implied, operating across -55°C to +125°C, supporting 2V–6V supply, and delivering 13ns typical propagation delay at 5V/15pF. It serves in military-grade industrial control panels requiring robust input prioritization under extreme temperature conditions.
For engineers reviewing the CD54HC147F3A datasheet, CD54HC147F3A pinout, CD54HC147F3A application, or CD54HC147F3A equivalent, key selection criteria include its CDIP (J) package with 16-pin through-hole layout, -55°C to 125°C extended temperature rating, HC-type logic compatibility, active-low input/output architecture, and priority resolution of nine inputs with I9 highest priority.
Technical Context
The CD54HC147F3A implements combinational priority encoding logic where nine active-low inputs (I0–I9) map to four active-low binary outputs (Y0–Y3), with I9 assigned highest priority and "zero" encoded when all inputs are high. Its silicon-gate CMOS design ensures LSTTL pin compatibility while maintaining low power consumption.
It operates strictly as a static combinatorial device-no clocks, latches, or internal state-relying on propagation-delay-limited signal settling. Input thresholds follow HC-family specifications (VIH = 3.15V min at VCC = 4.5V; VIL = 1.35V max), and output drive capability supports 15 LSTTL loads with balanced tPLH/tPHL timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HC-type CMOS: 2V–6V operation, high noise immunity (NIL/NIH = 30% of VCC), compatible with TTL-level inputs only via external pull-ups or level-shifting. |
| Propagation Delay | 13ns typical at VCC = 5V, CL = 15pF, TA = 25°C - enables reliable use in sub-50MHz digital control bus timing paths. |
| Operating Temperature | -55°C to +125°C - qualified for military and aerospace applications per CD54 prefix; no derating required across full range. |
| Input Configuration | 9 active-low data inputs (I0–I9), with I9 highest priority; NC on Pin 15 - requires external pull-up resistors for proper HIGH-state definition. |
| Output Drive | Bus-driver outputs capable of sinking/sourcing ±25mA per pin - sufficient to directly drive LED indicators or small logic loads without buffers. |
| Quiescent Current | ICC ≤ 160µA max at -55°C to +125°C - enables low-power standby modes in battery-backed systems. |
| Package Type | CDIP (J), 16-pin ceramic dual in-line - hermetically sealed, leaded, through-hole mount; body size 21.34mm × 6.92mm (excludes leads). |
Pinout & Package
CD54HC147F3A uses a 16-pin CDIP (J) package: ceramic dual in-line with through-hole leads, 21.34mm × 6.92mm nominal body, SNPB (tin-lead) finish, non-RoHS compliant, MSL not applicable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I4) | Active-low data input | Input line 4; asserted LOW to indicate request; part of 9-input priority chain with I9 highest priority. |
| 2 (I5) | Active-low data input | Input line 5; shares same priority hierarchy; must be pulled HIGH via external resistor when inactive. |
| 3 (I6) | Active-low data input | Input line 6; contributes to encoded 4-bit output Y3–Y0 only when higher-priority inputs (I7–I9) are inactive. |
| 4 (I7) | Active-low data input | Input line 7; higher priority than I0–I6; forces output encoding independent of lower-priority lines when asserted. |
| 5 (I8) | Active-low data input | Input line 8; second-highest priority; output reflects I8 status unless I9 is also active. |
| 6 (Y2) | Active-low encoded output | MSB of 4-bit binary output (Y3 Y2 Y1 Y0); LOW indicates bit-2 assertion in encoded value. |
| 7 (Y1) | Active-low encoded output | Bit-1 of output; complements Y3/Y2/Y0 to represent decimal input index (e.g., I5 → 0101 → Y3=H,Y2=L,Y1=L,Y0=H). |
| 8 (GND) | Ground reference | Primary return path for all internal logic and I/O; requires low-impedance connection to system ground plane. |
| 9 (I0) | Active-low data input | Lowest-priority input (I0); only encoded if all I1–I9 are HIGH; defines "zero" condition when all inputs HIGH. |
| 10 (I9) | Active-low data input | Highest-priority input; dominates encoding - output reflects I9 regardless of other inputs' states. |
| 11 (I1) | Active-low data input | Input line 1; priority between I0 and I2; encoded only when I2–I9 are all HIGH. |
| 12 (I2) | Active-low data input | Input line 2; higher priority than I0/I1; determines output when I3–I9 are inactive. |
| 13 (I3) | Active-low data input | Input line 3; priority just below I4; contributes to output only if I4–I9 remain HIGH. |
| 14 (Y3) | Active-low encoded output | Most significant bit of 4-bit output; LOW when encoded value ≥ 8 (i.e., I8 or I9 active). |
| 15 (NC) | No internal connection | Unbonded pin; must remain unconnected - no routing, grounding, or capacitive loading permitted. |
| 16 (VCC) | Positive supply | CMOS core supply; accepts 2V–6V; requires local 0.1µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Buffered inputs and outputs | Reduces capacitive loading effects and improves noise rejection across wide temperature range without external drivers. |
| Balanced propagation delay | tPLH and tPHL match within 10% - critical for glitch-free decoding in synchronous control state machines. |
| High noise immunity | NIL = NIH = 30% of VCC at 5V - enables reliable operation in electrically noisy avionics or motor-control environments. |
| Significant power reduction vs LSTTL | ICC ≤ 160µA max over full temp range - cuts static power by >90% versus equivalent 74LS147 in always-on subsystems. |
| Wide supply voltage range | 2V–6V operation - allows direct interface with 3.3V microcontrollers or legacy 5V backplanes without level shifters. |
Applications
| Industrial Control Panel | Aerospace Avionics Interface |
|---|---|
|
Use Scenario: Priority-based fault reporting in multi-sensor aircraft environmental monitoring system. IC Role / Device Role / Timing Role: Encodes up to nine discrete warning signals (e.g., cabin pressure, oxygen level, fire detection) into 4-bit bus for microcontroller polling. Use Value: Ensures highest-priority alert (e.g., fire) always overrides lower-priority warnings (e.g., filter clog) without software arbitration latency. |
Use Scenario: Input consolidation in radiation-hardened flight computer I/O expansion module. IC Role / Device Role / Timing Role: Translates discrete switch closures from cockpit controls into compact binary address for FPGA register mapping. Use Value: Eliminates need for software scan loops; deterministic hardware encoding meets DO-254 timing assurance requirements. |
| Military Communications Chassis | Test Equipment Front Panel |
|
Use Scenario: Mode selection encoding across 10-position rotary switch in secure radio transceiver. IC Role / Device Role / Timing Role: Converts mechanical switch position into 4-bit parallel code for baseband processor configuration. Use Value: Enables direct hardware-based mode switching with <15ns latency - avoids MCU interrupt jitter in real-time waveform generation. |
Use Scenario: Function key encoding in benchtop oscilloscope user interface with tactile switches. IC Role / Device Role / Timing Role: Aggregates 9 front-panel button presses into 4-bit bus for microcontroller debounced scan. Use Value: Reduces GPIO count by 5 pins; active-low outputs simplify pull-up resistor network design on PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar priority encoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC147E | Same HC logic family, PDIP-16 package, RoHS-compliant NiPdAu finish, rated -55°C to +125°C but catalog (not military-qualified) grade. | Lacks QML-38534 certification; unsuitable for DoD procurement or space-qualified designs requiring traceable lot documentation. | Select CD74HC147E for commercial/industrial prototypes where cost and RoHS compliance outweigh military qualification needs. |
| CD74HCT147E | HCT family: 4.5V–5.5V only, TTL-compatible inputs (VIL ≤ 0.8V), identical pinout and function but different VIH/VIL thresholds. | Requires strict 5V supply; cannot operate at 3.3V or 2V; better matches legacy LSTTL buses but incompatible with mixed-voltage systems. | Choose CD74HCT147E only when interfacing directly with 74LS-series logic without level translation. |
Compared with CD74HC147E and CD74HCT147E, CD54HC147F3A uniquely provides military-grade screening, hermetic CDIP packaging, and full 2V–6V flexibility - making it the sole option for high-reliability, wide-supply, extreme-temperature embedded control where certification and long-term availability are mandatory.
Availability
CD54HC147F3A is available at Aetrix Electronics and suitable for industrial control panels, aerospace avionics interfaces, and military communications chassis requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD54HC147F3A 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 over 90 years of innovation in high-reliability components.
CD54HC147F3A belongs to TI's CD54/CD74HC logic family, designed specifically for military, aerospace, and industrial applications demanding extended temperature operation, hermetic packaging, and QML certification.
FAQ
What is the operating voltage range for CD54HC147F3A?
The CD54HC147F3A operates from 2V to 6V DC supply voltage, as specified in its HC-family electrical characteristics. This wide range allows direct integration with both 3.3V microcontrollers and legacy 5V systems without level-shifting circuitry. Operation outside this range risks functional failure or permanent damage, per absolute maximum ratings.
Does CD54HC147F3A support true 10-line input encoding?
No - the CD54HC147F3A is a 9-input priority encoder that implements 10-line-to-4-line encoding by using an implied decimal "zero": when all nine inputs (I0–I9) are HIGH, all four outputs go HIGH to represent zero. There is no dedicated I10 input; the tenth state is derived logically, not physically.
Is CD54HC147F3A RoHS compliant?
No - CD54HC147F3A uses SNPB (tin-lead) lead finish and is explicitly marked "No" for RoHS compliance in TI's packaging documentation. It is intended for military and aerospace applications where leaded hermetic packages are required for reliability and solder joint integrity under thermal cycling.
What is the significance of Pin 15 (NC) on CD54HC147F3A?
Pin 15 is a no-connect terminal with no internal bond wire or circuit connection. It must remain unconnected - neither grounded nor routed - to avoid parasitic coupling or mechanical stress on the ceramic package. Board layout must exclude solder mask opening or trace routing at this location.
How does CD54HC147F3A handle simultaneous active inputs?
The CD54HC147F3A resolves simultaneous active inputs using fixed hardware priority: I9 has highest priority, then I8, I7… down to I0. If I5 and I9 are both LOW, the output reflects only I9's encoded value (1001), ignoring I5 entirely - no arbitration delay or metastability occurs, as encoding is purely combinational.
CD54HC147F3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Priority Encoder
- Circuit:
- 1 x 10:4
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
CD54HC147F3A FAQ
1.How can I place an order for CD54HC147F3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HC147F3A 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 CD54HC147F3A reliable?
The price and inventory of CD54HC147F3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HC147F3A is usually 5 days.
3.What payment methods are accepted for CD54HC147F3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HC147F3A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HC147F3A?
CD54HC147F3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HC147F3A 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 CD54HC147F3A?
For technical support, including CD54HC147F3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HC147F3A requirements.
6.How does Aetrix verify that CD54HC147F3A is sourced from the original manufacturer or authorized distributors?
All CD54HC147F3A 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 CD54HC147F3A meets industry standards.
7.What is the process for return or replacement of CD54HC147F3A?
All CD54HC147F3A units undergo pre-shipment inspection (PSI). If there is an issue with CD54HC147F3A, 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 CD54HC147F3A part is unused and in its original packaging.
Return procedure for CD54HC147F3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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