ON Semiconductor MC14541B, Manual

Page: 2 / 10

© Semiconductor Components Industries, LLC, 2014
December, 2018 − Rev. 15
1 Publication Order Number:
MC14541B/D
MC14541B
Programmable Timer
The MC14541B programmable timer consists of a 16 − stage binary
counter, an integrated oscillator for use with an external capacitor and
two resistors, an automatic power
− on reset circuit, and output control
logic.
Timing is initialized by turning on power, whereupon the power − on
reset is enabled and initializes the counter, within the specified V
DD
range. With the power already on, an external reset pulse can be
applied. Upon release of the initial reset command, the oscillator will
oscillate with a frequency determined by the external RC network. The
16
− stage counter divides the oscillator frequency (f
osc
) with the n
th
stage frequency being f
osc
/2
n
.
Features
•
Available Outputs 2
8
, 2
10
, 2
13
or 2
16
•
Increments on Positive Edge Clock Transitions
•
Built − in Low Power RC Oscillator (
±
2% accuracy over temperature
range and
±
20% supply and
±
3% over processing at < 10 kHz)
•
Oscillator May Be Bypassed if External Clock Is Available
(Apply external clock to Pin 3)
•
External Master Reset Totally Independent of Automatic Reset
Operation
•
Operates as 2
n
Frequency Divider or Single Transition Timer
•
Q/Q Select Provides Output Logic Level Flexibility
•
Reset (auto or master) Disables Oscillator During Resetting to
Provide No Active Power Dissipation
•
Clock Conditioning Circuit Permits Operation with Very Slow Clock
Rise and Fall Times
•
Automatic Reset Initializes All Counters On Power Up
•
Supply Voltage Range = 3.0 Vdc to 18 Vdc with Auto Reset
Supply Voltage Range = Disabled (Pin 5 = V
DD
)
Supply Voltage Range = 8.5 Vdc to 18 Vdc with Auto Reset
Supply Voltage Range = Enabled (Pin 5 = V
SS
)
•
NLV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC − Q100
Qualified and PPAP Capable
•
These Devices are Pb − Free and are RoHS Compliant
www.onsemi.com
MARKING DIAGRAMS
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G or
G = Pb − Free Package
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
ORDERING INFORMATION
SOIC − 14
D SUFFIX
CASE 751A
TSSOP − 14
DT SUFFIX
CASE 948G
1
14
14541BG
AWLYWW
14
541B
ALYW G
G
1
14
SOEIAJ − 14
F SUFFIX
CASE 965
1
14
MC14541B
ALYWG
(Note: Microdot may be in either location)
PIN ASSIGNMENT
NC = NO CONNECTION
11
12
13
14
8
9
10 5
4
3
2
1
7
6
MODE
NC
A
B
V
DD
Q
Q/Q SEL
NC
R
S
C
tc
R
tc
V
SS
MR
AR
SOIC − 14
TSSOP − 14
SOEIAJ − 14