CD54HCT191F3A Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
The CD54HCT191F3A is a synchronous 4-bit binary up/down counter with bidirectional counting and RCO (ripple carry output) in a 16-pin ceramic DIP package. It features load/preset input, HCT-family CMOS logic, and 50 pF load capacitance for versatile counting applications. Available from Texas Instruments with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD54HCT191F3A Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $28.8150(MOQ 1)
- 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 CD54HCT191F3A?
- Bidirectional synchronous 4-bit binary counter with up/down mode control and RCO (Ripple Carry Output) for easy cascading into wider counting configurations
- Parallel load/preset input enables synchronous preloading of any count value, providing flexible initialization and modulus control without external reset logic
- HCT-family CMOS logic in a military-grade 16-pin ceramic DIP package (R-GDIP-T16) delivers TTL-compatible inputs with CMOS power efficiency and high reliability
What is CD54HCT191F3A used for?
The CD54HCT191F3A is used in frequency dividers, event counters, and timing circuits in digital systems requiring bidirectional counting with synchronous load capability. Its RCO output allows cascading multiple devices to build wider counters for address generation, sequencer control, and time-base circuits in industrial and military electronics. The ceramic package ensures reliable operation in demanding environments with wide temperature excursions.
What are the specifications of CD54HCT191F3A?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | RCO OUTPUT |
| Count Direction | BIDIRECTIONAL |
| Family | HCT |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 20000000Hz |
| Max I(ol) | 0.004A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 48ns |
| Propagation Delay (tpd) | 41ns |
| Qualification Status | Not Qualified |
| Screening Level | 38535Q/M;38534H;883B |
| 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 | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 20MHz |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Where can I find the CD54HCT191F3A datasheet?
CD54HCT191F3A Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD54HCT191F3A?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What counting modes does the CD54HCT191F3A support?
The CD54HCT191F3A supports bidirectional (up and down) synchronous binary counting with a dedicated down/up mode control pin. It counts in 4-bit binary format and includes a Ripple Carry Output (RCO) for cascading multiple devices, enabling construction of 8-bit or wider counter configurations.
What is the load/preset input on the CD54HCT191F3A and how is it used?
The parallel load/preset input allows the counter to be synchronously loaded with any 4-bit binary value from the data inputs. This feature is used for counter modulus control, initializing count sequences to a specific starting value, or implementing programmable frequency dividers without requiring external reset circuitry, saving design complexity and component count.
What package does the CD54HCT191F3A use?
The CD54HCT191F3A uses a 16-pin ceramic dual-in-line package (R-GDIP-T16). The ceramic construction provides excellent hermeticity, thermal stability, and mechanical durability compared to plastic packages, making it well-suited for military-grade, aerospace, and high-reliability industrial electronics where environmental robustness is critical.
What is the RCO output on the CD54HCT191F3A and why is it important?
The RCO (Ripple Carry Output) is an active-low output that asserts when the counter reaches its terminal count (maximum in up-count mode, zero in down-count mode). This signal is used to enable the clock input of a next-stage counter, allowing multiple CD54HCT191F3A devices to be cascaded to form 8-bit, 12-bit, or wider synchronous counters without additional glue logic.
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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.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $33.9000 | $33.90 |
| 17+ | $30.5100 | $518.67 |
| 34+ | $28.8150 | $979.71 |
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