SN74HC191NE4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The SN74HC191NE4 is a 4-bit synchronous up/down binary counter IC from Texas Instruments. It operates at up to 17 MHz with a 50 pF load capacitance, supports synchronous presetting, and features a ripple clock output (RCO) for cascading. Available in a 16-pin DIP package.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC191NE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74HC191NE4?
- 4-bit synchronous bidirectional binary counter with up/down counting capability
- Ripple Clock Output (RCO) enables easy multi-stage cascading for wider count ranges
- Synchronous preset load input allows parallel loading of any 4-bit value on demand
- High-speed HC/UH logic family operating up to 17 MHz at 50 pF load capacitance
- Available in 16-pin DIP (R-PDIP-T16) package with RoHS e4 compliance
What is SN74HC191NE4 used for?
The SN74HC191NE4 is widely used in digital frequency dividers, event counters, and timing circuits where bidirectional counting is required. Its synchronous preset and ripple clock output make it ideal for cascaded multi-stage counter chains in industrial control systems, instrumentation, and digital clock generation. It also finds application in programmable logic controllers and embedded system peripherals requiring accurate pulse counting.
What are the specifications of SN74HC191NE4?
| YTEOL | 0 |
| 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 | 17000000Hz |
| 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 | 41ns |
| Propagation Delay (tpd) | 240ns |
| 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 | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 19MHz |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia, Mexico |
Where can I find the SN74HC191NE4 datasheet?
SN74HC191NE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74HC191NE4?
Compatible alternatives and drop-in replacements for SN74HC191NE4:
Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, CMOS, PDIP16
Frequently Asked Questions
What is the maximum counting frequency of the SN74HC191NE4?
The SN74HC191NE4 supports a maximum counting frequency of 17 MHz when driving a 50 pF load capacitance. This makes it suitable for medium-speed digital counting applications such as frequency division, event counting, and timing circuits in industrial and instrumentation designs.
How can SN74HC191NE4 counters be cascaded to create a wider counting range?
The SN74HC191NE4 features a Ripple Clock Output (RCO) pin that can be connected to the enable input of the next stage, allowing multiple 4-bit counter stages to be chained together. This enables 8-bit, 12-bit, or wider counters with minimal external logic, supporting count ranges well beyond the base 16-count (0–15) range.
In which package does the SN74HC191NE4 come and what are the pin count and pitch?
The SN74HC191NE4 is housed in a 16-pin through-hole DIP (Dual In-Line Package) with 2.54 mm pitch between pins, conforming to the JESD-30 R-PDIP-T16 specification. This standard through-hole form factor is well-suited for prototyping on breadboards and for applications where socketed replacement is preferred.
When would you choose SN74HC191NE4 over a microcontroller timer for pulse counting?
The SN74HC191NE4 is preferred when hardware-based counting is needed at up to 17 MHz without consuming CPU cycles, which is critical in real-time applications with tight timing requirements. Unlike software timers in microcontrollers, this dedicated 4-bit synchronous binary counter operates deterministically and supports bidirectional counting with parallel preset loading, reducing system complexity.
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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.
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