MC14534B Datasheet, PDF (1/9 Pages) Motorola, Inc – 5 CASCADED BCD COUNTERS

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
5 Cascaded BCD Counters
The MC14534B is composed of five BCD ripple counters that have their
respective outputs multiplexed using an internal scanner. Outputs of each
counter are selected by the scanner and appear on four (BCD) pins.
Selection is indicated by a logic high on the appropriate digit select pin. Both
BCD and digit select outputs have three–state controls providing an
“open–circuit” when these controls are high and allowing multiplexing.
Cascading may be accomplished by using the carry–out pin. The counters
and scanner can be independently reset by applying a high to the counter
master reset (MR) and the scanner reset (SR). The MC14534B was
specifically designed for application in real time or event counters where
continual updating and multiplexed displays are used.
• Four Operating Modes (See truth table)
• Input Error Detection Circuit
• Clock Conditioning Circuits for Slow Transition Inputs
• Counter Sequences on Positive Transition of Clock A
• Supply Voltage Range = 3.0 Vdc to 18 Vdc
• Capable of Driving Two Low–power TTL Loads or One Low–power
Schottky TTL Load Over the Rated Temperature Range
MC14534B
L SUFFIX
CERAMIC
CASE 623
P SUFFIX
PLASTIC
CASE 709
DW SUFFIX
SOIC
CASE 751E
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
Plastic
Ceramic
SOIC
TA = – 55° to 125°C for all packages.
BLOCK DIAGRAM
TO CAPACITORS
23
CLOCK B
CLOCK A
4
MASTER ²
RESET
5
MODE A
MODE B
6
PULSE
SHAPER
UNITS
C ÷ 10
Q0
Cn+4
Q3
OUTPUT
CONTROL
MUX
22
1
PULSE ERROR
DETECTOR
3
ERROR OUT
TEST
CONTROL
VDD = PIN 24
VSS = PIN 12
CARRY
CONTROL
TENS
C ÷ 10
Q0
Cn+4
Q3
HUNDREDS
C ÷ 10
Q0
Cn+4
Q3
MUX
MUX
THOUSANDS
C ÷ 10
Q0
Cn+4
Q3
TEN
THOUSANDS
C ÷ 10
Cn+4
Q0 Q3
MUX
MUX
SCANNER
RESET ₉
SCANNER ¹⁰
CLOCK
R
SCANNER
13
CARRY OUT
17
Q3
18
Q2
BCD
19
OUT
Q1
20
Q0
NOTE:
= 3–STATE
OUTPUT BUFFER
7
DS1
8
14
16
DS2 DS3
DS4
DIGIT SELECT
11
DS5
15 _{3–STATE DIGIT}
CONTROL
3–STATE BCD
21 _CONTROL
3–State Control
Out
0
Q or DS
1
High Impedance
REV 3
1/94
©MMOotoTrOolaR, IOncL. A199C5MOS LOGIC DATA
MC14534B
1