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© Semiconductor Components Industries, LLC, 2011
June, 2011 − Rev. 12
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
)
• These Devices are Pb−Free and are RoHS Compliant
PIN ASSIGNMENT
NC = NO CONNECTION
11
12
13
14
8
9
105
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
http://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
1
14
PDIP−14
P SUFFIX
CASE 646
MC14541BCP
AWLYYWWG
SOIC−14
D SUFFIX
CASE 751A
TSSOP−14
DT SUFFIX
CASE 948G
1
14
14541BG
AWLYWW
14
541B
ALYWG
G
1
14
SOEIAJ−14
F SUFFIX
CASE 965
1
14
MC14541B
ALYWG
(Note: Microdot may be in either location)
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