CD74HC191E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
CD74HC191E is a 4-stage synchronous binary up/down counter IC by Texas Instruments with parallel load and RCO ripple carry output. Key specs: 2 V to 6 V supply, 20 MHz max clock, 16-pin PDIP package. From stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD74HC191E Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.3600(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 CD74HC191E?
- 4-bit synchronous bidirectional binary counter with parallel load for programmable counting sequences
- Ripple Carry Output (RCO) enabling cascading of multiple CD74HC191E devices for wider counter widths
- 20 MHz maximum clock frequency over a 2 V to 6 V supply range for versatile timing and counting applications
What is CD74HC191E used for?
CD74HC191E is used in digital systems requiring programmable up/down counting such as position encoders, frequency dividers, and industrial event counters. Its synchronous parallel load input allows preloading a starting count value, enabling custom modulo sequences for BCD conversion, PWM generation, and stepper motor position tracking. The 2 V to 6 V supply range makes it compatible with battery-powered devices and legacy 5 V TTL systems alike.
What are the specifications of CD74HC191E?
| YTEOL | 15 |
| Additional Feature | RCO OUTPUT |
| Count Direction | BIDIRECTIONAL |
| Family | HC/UH |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 20000000Hz |
| Max I(ol) | 0.0052A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| 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 | 37ns |
| Propagation Delay (tpd) | 255ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| 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 |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 23MHz |
| 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, Mexico |
Where can I find the CD74HC191E datasheet?
CD74HC191E Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HC191E?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does CD74HC191E's parallel load input enable custom counting sequences in embedded timer designs?
CD74HC191E's active-low parallel load input allows synchronously preloading a 4-bit binary value on the next clock edge, enabling the counter to start from any value between 0 and 15. This feature is used in modulo-N counter designs—for example, preloading 6 each time the counter reaches 15 creates a modulo-10 divider dividing an input clock by 10 without external logic gates.
What is the maximum operating clock frequency of CD74HC191E at 5 V supply with a 50 pF load?
At 5 V supply with a 50 pF load capacitance, CD74HC191E is specified to operate up to 20 MHz clock frequency. This covers most standard microcontroller peripheral bus clock rates and allows the device to count and decode events at rates up to 20 million counts per second in industrial pulse counting and frequency measurement applications.
How can multiple CD74HC191E devices be cascaded to build a wider than 4-bit counter?
Multiple CD74HC191E ICs are cascaded by connecting the Ripple Carry Output (RCO) of the lower-stage device to the Enable Trickle (CTEN) input of the next higher-stage device. This creates synchronous cascading where carry propagation enables the next counter stage only at terminal count, supporting 8-bit counters with 2 ICs or 16-bit counters with 4 ICs, all clocked from a common 20 MHz source.
In which supply voltage environments can CD74HC191E operate and does it interface directly with 3.3 V logic?
CD74HC191E operates from 2 V to 6 V, making it directly usable at both 3.3 V and 5 V supply rails. At 3.3 V, output logic HIGH levels exceed 2.9 V, which meets the input threshold requirements of most 3.3 V CMOS logic devices. This dual-voltage compatibility allows CD74HC191E to serve as a counter in mixed-voltage systems bridging legacy 5 V TTL boards and modern 3.3 V microcontroller platforms.
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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 |
|---|---|---|
| 1+ | $0.4770 | $0.48 |
| 11+ | $0.3975 | $4.37 |
| 445+ | $0.3600 | $160.20 |
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