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
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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
MARKING
DIAGRAMS
oscillate with a frequency determined by the external RC network. The
th
14
16−stage counter divides the oscillator frequency (f ) with the n
osc
n
PDIP−14
P SUFFIX
CASE 646
stage frequency being f /2 .
osc
MC14541BCP
AWLYYWWG
Features
1
8
10 13
16
• Available Outputs 2 , 2 , 2 or 2
• Increments on Positive Edge Clock Transitions
14
1
• 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)
SOIC−14
D SUFFIX
CASE 751A
14541BG
AWLYWW
• External Master Reset Totally Independent of Automatic Reset
Operation
• Operates as 2 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
14
14
541B
ALYWG
G
n
TSSOP−14
DT SUFFIX
CASE 948G
1
• Clock Conditioning Circuit Permits Operation with Very Slow Clock
Rise and Fall Times
14
1
SOEIAJ−14
F SUFFIX
CASE 965
MC14541B
ALYWG
• 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
A
WL, L
YY, Y
= Assembly Location
= Wafer Lot
= Year
Supply Voltage Range = Enabled (Pin 5 = V
)
SS
• Pb−Free Packages are Available
WW, W = Work Week
G or G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN ASSIGNMENT
R
C
1
2
3
4
5
6
14
13
12
V
B
A
tc
tc
DD
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
R
S
NC
AR
MR
11 NC
10 MODE
9
8
Q/Q SEL
Q
V
7
SS
NC = NO CONNECTION
©
Semiconductor Components Industries, LLC, 2006
1
Publication Order Number:
October, 2006 − Rev. 10
MC14541B/D