MC14516B ON Semiconductor, MC14516B Datasheet - Page 8

• Manufacturer Part Number: MC14516B
• Description: Binary Up/Down Counter
• Manufacturer: ON Semiconductor

0 = COUNT
1 = PRESET
1 = UP
0 = DOWN
NOTE: The Least Significant Digit (L.S.D.) counts from a preset value once Preset Enable (PE) goes low. The Most Significant
+V
DD
PRESET
ENABLE
Digit (M.S.D.) is disabled while C
up mode), C
(See Timing Diagram) The L.S.D. now counts through another cycle (15 clock pulses) and the above cycle is repeated.
CLOCK
RESET
OPEN = COUNT
out
goes low for one complete clock cycle, thus allowing the next counter to decrement/increment one count.
PE
C
CLOCK
U/D
R
Q0
in
P0
Q0
P0
Figure 3. Presettable Cascaded 8–Bit Up/Down Counter
THUMBWHEEL SWITCHES
Q1
P1
Q1
P1
(OPEN FOR “0”)
MC14516B
in
L.S.D.
is high. When the count of the L.S.D. reaches 0 (count down mode) or reaches 15 (count
+V
Q2
P2
Q2
P2
DD
http://onsemi.com
Q3
P3
C
Q3
P3
out
MC14516B
8
PE
C
CLOCK
U/D
R
Q4
Q0
in
P0
RESISTORS = 10 k
P4
Q5
Q1
P1
P5
MC14516B
M.S.D.
W
+V
Q6
Q2
P2
P6
DD
Q7
Q3
P3
C
P7
out
TERMINAL COUNT
INDICATOR