MC14541B_06 Datasheet, PDF (1/10 Pages) ON Semiconductor – Programmable Timer

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/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 = V_DD)
Supply Voltage Range = 8.5 Vdc to 18 Vdc with Auto Reset
Supply Voltage Range = Enabled (Pin 5 = V_SS)
• Pb−Free Packages are Available
PIN ASSIGNMENT
R_tc 1
C_tc 2
R_S 3
NC 4
AR 5
MR 6
V_SS 7
14 V_DD
13 B
12 A
11 NC
10 MODE
9 Q/Q SEL
8Q
NC = NO CONNECTION
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MARKING
DIAGRAMS
PDIP−14
P SUFFIX
CASE 646
14
MC14541BCP
AWLYYWWG
1
14
SOIC−14
D SUFFIX
CASE 751A
14541BG
AWLYWW
1
TSSOP−14
DT SUFFIX
CASE 948G
14
14
541B
ALYWG
G
1
SOEIAJ−14
F SUFFIX
CASE 965
14
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)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
1
October, 2006 − Rev. 10
Publication Order Number:
MC14541B/D