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Description
74191Synchronous Up Down Binary Counter Specifications Logic Family: TTL (74xx series) Function: 4 bit synchronous up down binary counter Package: 16 pin DIP Count Range: 0 to 15 (binary) Clock Input: Synchronous clock Count Direction Control: Up Down input Parallel Data Inputs: 4 (AD) Parallel Load: Active LOW load input Outputs: Q0Q3 Terminal Count Outputs: Ripple Carry (RC) Terminal Count (TC) for cascading Enable Inputs: Count enable control inputs
Synchronous Up/Down Binary Counter
Specifications
- Logic Family: TTL (74xx series)
- Function: 4-bit synchronous up/down binary counter
- Package: 16-pin DIP
- Count Range: 0 to 15 (binary)
- Clock Input: Synchronous clock
- Count Direction Control: Up/Down input
- Parallel Data Inputs: 4 (A–D)
- Parallel Load: Active LOW load input
- Outputs: Q0–Q3
- Terminal Count Outputs:
- Ripple Carry (RC)
- Terminal Count (TC) for cascading
- Enable Inputs: Count enable/control inputs
- Supply Voltage (Vcc): 4.75 V – 5.25 V (5 V nominal)
- Absolute Max Vcc: ~7 V
- Input Voltage Range: –0.5 V to Vcc
- Logic HIGH (VIH): ≥ 2.0 V
- Logic LOW (VIL): ≤ 0.8 V
- Output HIGH (VOH): ≥ 2.4 V
- Output LOW (VOL): ≤ 0.4 V
- Propagation Delay: ~20–35 ns typical
- Max Clock Frequency: ~25 MHz (typical TTL conditions)
- Power Dissipation: ~60 mW typical
- Operating Temperature: 0 °C to 70 °C
Feature
- Synchronous up/down counting
- Parallel preset capability
- Cascade connection for larger counters
- High-speed TTL operation
- Terminal count outputs for expansion
Typical Applications
- Digital counters
- Frequency division
- Position counting
- Timers
- Control systems and sequencing
Additional Information
| Keywords | Counter |
| Device | Counter |
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Exchange/Return Notes
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★★★★★ 5
Totally legit!
Color: Shiny Light Gold, Lens Width: 57 Millimeters
Totally legit. I love them! They fit great!
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Reviewed in the United States on February 24, 2025
★★★★★ 5
Love them
Color: Silver, Lens Width: 57 Millimeters
Love them! Fit just right and look amazing on!
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Reviewed in the United States on July 13, 2024
★★★★★ 4
Good
Color: Shiny Light Gold, Lens Width: 57 Millimeters
Good
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Reviewed in the United States on December 16, 2025
★★★★★ 5
Favorites!
Color: Silver, Lens Width: 57 Millimeters
I’m not a sunglasses person by any means. I only ever bought the cheap $5 sunglasses for years cause I didn’t care to wear them anyway and I never liked how they looked on me. THESE HOWEVER. Jaw dropped. I love them. I wear them everywhere. I care for them and clean them like they are my child. They are the best investment into sunglasses I have ever made.
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Reviewed in the United States on July 26, 2023
★★★★★ 5
Love
Color: Silver, Lens Width: 57 Millimeters, Color: Silver, Lens Width: 57 Millimeters
These are super light weight & dainty. The tom boy in me is afraid of breaking them
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Reviewed in the United States on July 25, 2023