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 VDD
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 (fosc) with the nth
stage frequency being fosc/2n.
Features
• Available Outputs 28, 210, 213 or 216
• 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 2n 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 = VDD)
Supply Voltage Range = 8.5 Vdc to 18 Vdc with Auto Reset
Supply Voltage Range = Enabled (Pin 5 = VSS)
Pb−Free Packages are Available
PIN ASSIGNMENT
Rtc
1
14
VDD
Ctc
2
13
3
12
A
NC
4
11
NC
MARKING
DIAGRAMS
14
PDIP−14
P SUFFIX
CASE 646
MC14541BCP
AWLYYWWG
1
14
SOIC−14
D SUFFIX
CASE 751A
14541BG
AWLYWW
1
14
14
541B
ALYWG
G
TSSOP−14
DT SUFFIX
CASE 948G
1
14
SOEIAJ−14
F SUFFIX
CASE 965
MC14541B
ALYWG
1
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W = Work Week
G or G
= Pb−Free Package
(Note: Microdot may be in either location)
B
RS
http://onsemi.com
MODE
AR
5
10
MR
6
9
Q/Q SEL
VSS
7
8
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
Q
NC = NO CONNECTION
© Semiconductor Components Industries, LLC, 2006
October, 2006 − Rev. 10
1
Publication Order Number:
MC14541B/D
