CD74HC191M96E4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
CD74HC191M96E4 is a presettable 4-bit synchronous binary up/down counter IC from Texas Instruments in a 16-pin SOIC package. It supports bidirectional counting up to 20 MHz at 50 pF load with a ripple carry output (RCO) for cascading. Available on 96-unit tape-and-reel for automated SMT assembly in digital timing and sequencing circuits.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HC191M96E4 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2890(MOQ 12500)
- 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 CD74HC191M96E4?
- Presettable 4-bit synchronous up/down binary counter operating up to 20 MHz at 50 pF load
- Bidirectional count direction control for flexible increment or decrement operation
- Ripple carry output (RCO) enables cascading multiple CD74HC191 stages into wider counters
- HC CMOS family compatible with 2 V to 6 V supply and standard TTL input levels
What is CD74HC191M96E4 used for?
CD74HC191M96E4 is used as a frequency divider and event counter in digital logic circuits for industrial timing controllers, programmable timers, and pulse counting systems where a presettable 4-bit binary count is required. Its bidirectional counting capability and RCO output allow designers to cascade multiple devices into 8-bit or 16-bit counters for wider count ranges in position encoders and stepper motor indexers. The device also finds use in FPGA peripheral boards and retro-computing glue logic where a standalone synchronous counter element is needed with direct load capability and single-supply 5 V operation.
What are the specifications of CD74HC191M96E4?
| 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 | TR |
| 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 |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| 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 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Where can I find the CD74HC191M96E4 datasheet?
CD74HC191M96E4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HC191M96E4?
Compatible alternatives and drop-in replacements for CD74HC191M96E4:
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
Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, CMOS, PDSO16
Frequently Asked Questions
How fast can CD74HC191M96E4 count and how does load capacitance affect that?
At its nominal supply voltage with a 50 pF load capacitance, CD74HC191M96E4 achieves a maximum clock frequency of 20 MHz. With lighter loads below 15 pF, propagation delay decreases and effective frequency can approach 25 MHz in practice. Heavier capacitive loads above 50 pF reduce the maximum reliable frequency and should be accounted for in high-speed timing designs.
How can multiple CD74HC191M96E4 devices be cascaded to build an 8-bit counter?
Two CD74HC191M96E4 devices can be cascaded into an 8-bit binary counter by connecting the RCO (ripple carry output) of the lower 4-bit stage to the count enable input of the upper 4-bit stage. The RCO goes active when the lower counter reaches terminal count (15 for up-counting), enabling one clock cycle of carry propagation. This synchronous ripple scheme maintains accurate count at frequencies up to 20 MHz while supporting parallel preset of all 8 bits simultaneously.
What supply voltage range does CD74HC191M96E4 operate from, and can it interface with 3.3 V logic?
CD74HC191M96E4 operates from 2 V to 6 V, covering both 3.3 V and 5 V supply rails. When powered at 3.3 V, the device interfaces directly with 3.3 V microcontroller GPIOs and FPGA I/O pins. At 5 V, the output voltage levels swing to full 5 V CMOS levels, requiring a level-shifter if driving 3.3 V-only receivers to avoid exceeding their maximum input voltage.
In a position encoder application, how does the bidirectional count feature of CD74HC191M96E4 help?
The D/U (down/up) control pin on CD74HC191M96E4 allows the counter to increment or decrement with each clock edge based on the current direction signal from a quadrature encoder. This eliminates the need for separate up-counter and down-counter ICs, enabling a compact 4-bit position tracking circuit using a single 16-pin SOIC device with direct 4-bit parallel preset capability for home-position initialization.
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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 |
|---|---|---|
| 12500+ | $0.2942 | $3677.75 |
| 17500+ | $0.2915 | $5102.13 |
| 25000+ | $0.2890 | $7225.00 |
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