CD74HC191M Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
CD74HC191M is a 4-stage synchronous up/down binary counter from Texas Instruments in the HC/UH CMOS family, clocking up to 20 MHz across a 2 V to 6 V supply with parallel load/preset and ripple carry output. Its bidirectional counting and RCO output simplify multi-stage counter cascading in a 16-pin SOIC package. Available from stock globally with competitive pricing.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HC191M Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2640(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 CD74HC191M?
- 4-bit bidirectional synchronous binary counter with up/down control for flexible counting sequences in digital timing circuits
- Parallel load/preset input enables rapid initialization to any 4-bit value, reducing setup latency in programmable frequency dividers
- Ripple carry output (RCO) enables seamless cascading of multiple CD74HC191M stages to build wider counters beyond 4 bits
What is CD74HC191M used for?
CD74HC191M is used in frequency dividers, programmable timer circuits, and digital event counters in industrial control panels where bidirectional counting and synchronous parallel loading are required. Its RCO output allows easy cascading of multiple devices to form 8-bit or wider counters without additional glue logic. The 16-pin SOIC package is suitable for surface-mount production with automated assembly.
What are the specifications of CD74HC191M?
| 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 | 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 | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| 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 | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 23MHz |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Where can I find the CD74HC191M datasheet?
CD74HC191M Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HC191M?
Compatible alternatives and drop-in replacements for CD74HC191M:
Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, CMOS, PDSO16
Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, CMOS, PDSO16
Frequently Asked Questions
How fast can CD74HC191M count, and at what supply voltage is this rating achieved?
CD74HC191M achieves a maximum clock frequency of 20 MHz when operated within its 2 V to 6 V supply range in the HC/UH CMOS family, with a 50 pF load capacitance, making it suitable for mid-speed frequency division and event counting applications without external speed-up components.
How does the parallel preset input of CD74HC191M help in programmable frequency dividers?
The parallel load/preset input of CD74HC191M lets the user synchronously load any 4-bit value from 0 to 15 into the counter registers, allowing the divider ratio to be changed on the fly. This feature eliminates the need for a separate latch or shift register to initialize the count value, reducing component count and design complexity.
How can multiple CD74HC191M ICs be cascaded to count beyond 4 bits?
Multiple CD74HC191M devices are cascaded using the ripple carry output (RCO), which pulses when the counter reaches its terminal count. Connecting RCO of the low-order stage to the count-enable of the next stage extends the counter width to 8-bit, 12-bit, or beyond with minimal additional logic and no extra decoder needed.
In which industrial or automation scenarios is CD74HC191M's bidirectional counting most useful?
CD74HC191M's up/down counting is especially useful in motor position tracking systems where the counter increments on forward pulses and decrements on reverse pulses, in rotary encoder interfaces for conveyor belt control, and in programmable delay generators where the count direction determines timeout direction across the full 0 to 15 range.
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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+ | $1.0750 | $1.07 |
| 21+ | $0.2768 | $5.81 |
| 25+ | $0.2758 | $6.89 |
| 120+ | $0.2741 | $32.89 |
| 250+ | $0.2640 | $66.00 |
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