详情
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Dual 4-bit binary ripple counter
Below is the parameter table and instructions for the 74HC393A dual 4-bit binary counter:
74HC393A Parameter Table
| Parameter |
Symbol |
Min |
Typ |
Max |
Unit |
Conditions |
| Supply Voltage |
VCC |
2.0 |
5.0 |
6.0 |
V |
|
| Input Low Voltage |
VIL |
0.0 |
0.8 |
1.5 |
V |
VCC = 4.5V to 5.5V |
| Input High Voltage |
VIH |
3.5 |
4.0 |
5.0 |
V |
VCC = 4.5V to 5.5V |
| Output Low Voltage |
VOL |
0.0 |
0.1 |
0.4 |
V |
IOL = 4mA |
| Output High Voltage |
VOH |
4.6 |
4.9 |
5.0 |
V |
IOH = -0.4mA |
| Input Leakage Current |
IIL |
-1.0 |
-0.1 |
1.0 |
μA |
VCC = 4.5V to 5.5V |
| Output Leakage Current |
IOL |
-1.0 |
-0.1 |
1.0 |
μA |
VCC = 4.5V to 5.5V |
| Propagation Delay Time |
tpd |
10 |
22 |
34 |
ns |
VCC = 4.5V to 5.5V |
| Power Consumption |
Ptot |
- |
1.0 |
2.0 |
mW |
fosc = 10MHz, TA = 25°C |
| Operating Temperature Range |
TA |
-40 |
25 |
85 |
°C |
|
Instructions for Using 74HC393A
Pin Configuration
- Pin 1 (Q0A): Output of Counter A, Bit 0
- Pin 2 (Q1A): Output of Counter A, Bit 1
- Pin 3 (Q2A): Output of Counter A, Bit 2
- Pin 4 (Q3A): Output of Counter A, Bit 3
- Pin 5 (MR1A): Master Reset for Counter A
- Pin 6 (CPA): Clock Input for Counter A
- Pin 7 (GND): Ground
- Pin 9 (CPB): Clock Input for Counter B
- Pin 10 (MR1B): Master Reset for Counter B
- Pin 11 (Q0B): Output of Counter B, Bit 0
- Pin 12 (Q1B): Output of Counter B, Bit 1
- Pin 13 (Q2B): Output of Counter B, Bit 2
- Pin 14 (Q3B): Output of Counter B, Bit 3
- Pin 15 (VCC): Power Supply
Basic Operation
- Power Supply: Connect VCC to the positive power supply (2.0V to 6.0V) and GND to ground.
- Clock Input (CPA, CPB): Apply the clock signal to CPA or CPB to increment the respective counter.
- Master Reset (MR1A, MR1B): Set MR1A or MR1B to high to reset the respective counter to 0.
- Outputs (Q0A-Q3A, Q0B-Q3B): These pins provide the binary output of the counters. Q0 is the least significant bit (LSB) and Q3 is the most significant bit (MSB).
Example Circuit
Counter A:
- Connect CPA to a clock source.
- Connect MR1A to a reset button or logic high to reset the counter.
- Connect Q0A to Q3A to LEDs or other load to display the count.
Counter B:
- Connect CPB to a clock source.
- Connect MR1B to a reset button or logic high to reset the counter.
- Connect Q0B to Q3B to LEDs or other load to display the count.
Notes
- Ensure that the clock frequency does not exceed the maximum operating frequency of the device.
- Use decoupling capacitors (e.g., 0.1μF) between VCC and GND close to the IC to reduce noise.
- The 74HC393A can be cascaded to form longer counters by connecting the output of one counter to the clock input of another.
This should provide you with a comprehensive overview of the 74HC393A dual 4-bit binary counter.
(For reference only)
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