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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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4.8 ★★★★★
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Product Reviews
★★★★★ 5
Good quality
light and blends pretty well
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Reviewed in the United States on February 6, 2026
★★★★★ 5
Amazing stuff!!
Love love love this stuff! You do have to spread it out well to not go right through it but it doesn’t take more than a thin layer to protect you all day!!
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Reviewed in the United States on October 15, 2025
★★★★★ 4
amazing product, a little too pricey
it worked amazing while we were trying to swim in the ocean and snorkel in the ocean. The only downfall I have of this is the price is so much for such a little amount.
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Reviewed in the United States on July 15, 2025
★★★★★ 5
Great clean sunscreen
Great sunscreen, made of minerals instead of chemicals, holds nice in water when surfacing
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Reviewed in the United States on September 6, 2025
★★★★★ 5
My go to brand
My go to brand. Other brands I have to reapply constantly and still have sunburn. I love this brand and the stick is even better for applying sunscreen. Very reliable without any mess!
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Reviewed in the United States on February 3, 2025