cdb4520bms Intersil Corporation, cdb4520bms Datasheet - Page 6

• Manufacturer Part Number: cdb4520bms
• Description: Cmos Dual Up Counters
• Manufacturer: Intersil Corporation

Logic Diagrams
*
*
ALL INPUTS ARE PROTECTED
BY CMOS PROTECTION
NETWORK
ALL INPUTS ARE PROTECTED
BY CMOS PROTECTION
NETWORK
FIGURE 1. DECADE COUNTER (CD4518BMS) LOGIC DIAGRAM FOR ONE OF TWO IDENTICAL COUNTERS
FIGURE 2. BINARY COUNTER (CD4520BMS) LOGIC DIAGRAM FOR ONE OF TWO IDENTICAL COUNTERS
ENABLE
ENABLE
CLOCK
RESET
CLOCK
RESET
7/15
2/10
7/15
2/10
1/9
1/9
*
*
*
*
*
*
VDD
X = Don’t Care
VDD
VSS
CLOCK
VSS
X
X
0
1
CD4518BMS, CD4520BMS
1
ENABLE
D
C
High State
D
C
R
R
Q
X
X
1
0
Q
Q
Q
TRUTH TABLE
Q1
Q1
3/11
3/11
7-1211
0
RESET
Low State
0
0
0
0
0
0
1
D
C
D
C
R
R
Q
Q
Q
Q
Increment Counter
Increment Counter
No Change
No Change
No Change
No Change
Q1 thru Q4 = 0
Q2
Q2
4/12
4/12
ACTION
D
C
D
C
R
R
Q
Q
Q
Q
Q3
Q3
5/13
5/13
D
C
D
C
R
R
Q
Q
Q
Q
Q4
Q4
6/14
6/14