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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 |
Shipping Notes
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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4.5 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Very stylish
Size: 3.5 Big Kid, Color: Light Pink
My daughter was so excited to get these shoes. They are stylish and comfortable!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
★★★★★ 1
Too tight at opening
Size: 13 Little Kid, Color: Light Pink
I bought a size larger for my child, and the foot won’t go in. Her other sketchers slides are great. But I do not recommend this model.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 7, 2026
★★★★★ 5
Cumplimiento
Size: 13.5 Little Kid, Color: Light Pink
Producto de gran calidad , acorde con lo escrito en la descripción. Llegaron antes del tiempo estimado
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
★★★★★ 5
Very stylish
Size: 3.5 Big Kid, Color: Light Pink
My daughter was so excited to get these shoes. They are stylish and comfortable!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
★★★★★ 1
Too tight at opening
Size: 13 Little Kid, Color: Light Pink
I bought a size larger for my child, and the foot won’t go in. Her other sketchers slides are great. But I do not recommend this model.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 7, 2026