MC74HC4020ADG ON Semiconductor, MC74HC4020ADG Datasheet - Page 8

• Manufacturer Part Number: MC74HC4020ADG
• Description: IC COUNTER 14STAGE BIN 16-SOIC
• Manufacturer: ON Semiconductor
• Series: 74HCr

Specifications of MC74HC4020ADG

• Logic Type: Binary Counter
• Direction: Up
• Number Of Elements: 1
• Number Of Bits Per Element: 14
• Reset: Asynchronous
• Count Rate: 50MHz
• Trigger Type: Negative Edge
• Voltage - Supply: 2 V ~ 6 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Counter Type: Binary
• Counting Sequence: Up
• Number Of Circuits: 1
• Logic Family: 74HC
• Propagation Delay Time: 96 ns, 63 ns, 31 ns, 25 ns
• Supply Voltage (max): 6 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Function: Counter
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 2 V to 6 V
• Rohs Compliant: YES
• Timing: -
• Clock Frequency: 50MHz
• Count Maximum: 16383
• Supply Voltage Range: 2V To 6V
• Logic Case Style: SOIC
• No. Of Pins: 16
• Operating Temperature Range: -55°C To +125°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Timing: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Time−Base Generator
connected directly to a standard 120 Vac power line is
applied to the input of the MC54/74HC14A, Schmitt-trigger
inverter. The HC14A squares−up the input waveform and
A 60Hz sinewave obtained through a 1.0 Megohm resistor
120Vac
Reset
Clock
60Hz
Q10
Q12
Q13
Q14
Q4
Q5
Q6
Q7
Q8
Q9
NOTE:
Ground MUST be isolated
by a transformer or
opto−isolator for safety
reasons.
1
2
1.0M
≥20pF
4
8
V
CC
16
1/6 of HC14A
APPLICATIONS INFORMATION
Figure 8. Timing Diagram
32
Figure 9. Time−Base Generator
http://onsemi.com
64
Clock
HC4020A
8
V
128
CC
feeds the HC4020A. Selecting outputs Q5, Q10, Q11, and
Q12 causes a reset every 3600 clocks. The HC20 decodes the
counter outputs, produces a single (narrow) output pulse,
and resets the binary counter. The resulting output frequency
is 1.0 pulse/minute.
Q10
Q12
Q11
Q5
256
13
12
10
9
512
HC20
1/2
1024
8
2048
1
2
4
5
HC20
4096
1/2
6
8192
1.0 Pulse/Minute
Output
16384