SN74HC191DG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74HC191DG4 is a 4-bit bidirectional binary counter IC in a 16-pin SOIC package from Texas Instruments. It operates in the HC/UH logic family, supports up to 17 MHz counting frequency, includes load and preset inputs, and features a ripple carry output for cascading multiple counter stages.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC191DG4 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
Key Features
- 4-bit bidirectional binary counter with up/down counting control
- Maximum counting frequency of 17 MHz at nominal supply
- Ripple carry output (RCO) enables cascading to wider bit widths
- Load and preset inputs allow synchronous parallel loading
- HC/UH logic family compatible with 2 V to 6 V supply range
- 16-pin SOIC package (50 pF load capacitance) for compact PCB layouts
Applications
The SN74HC191DG4 is commonly used in digital timing circuits, frequency dividers, and event counters within industrial control and test equipment. Its bidirectional counting capability and ripple carry output make it suitable for building multi-stage binary counters or address generators in embedded systems. Consumer electronics, programmable sequencers, and educational development boards also employ this device for general-purpose counting and state-machine implementations.
Specifications
| YTEOL | 0 |
| Additional Feature | RCO OUTPUT |
| Count Direction | BIDIRECTIONAL |
| Family | HC/UH |
| JESD-30 Code | R-PDSO-G16 |
| 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) | 0.004A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 50mA |
| Prop. Delay@Nom-Sup | 48ns |
| 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 | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 19MHz |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC191DG4:
Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, CMOS, PDSO16
Frequently Asked Questions
What is the maximum counting frequency of the SN74HC191DG4 and what logic family does it belong to?
The SN74HC191DG4 belongs to the HC/UH logic family and supports a maximum counting frequency of 17 MHz at nominal supply voltage. This speed suits most digital event counting and timing applications in industrial and consumer electronics.
How can multiple SN74HC191DG4 devices be cascaded for wider binary counter implementations?
The ripple carry output (RCO) pin on the SN74HC191DG4 drives the enable input of the next stage, allowing 4-bit sections to be chained into 8-bit, 12-bit, or wider counters while maintaining a 17 MHz counting rate on each stage.
For a digital sequencer design, what load capacitance and supply voltage does the SN74HC191DG4 support?
The SN74HC191DG4 is characterized with a 50 pF load capacitance and operates across a 2 V to 6 V supply range, making it compatible with 3.3 V and 5 V logic systems in sequencers, address generators, and programmable timers.
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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.
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