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PDF MC14541B Data sheet ( Hoja de datos )
| Número de pieza | MC14541B | |
| Descripción | Programmable Timer | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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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)
• 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
http://onsemi.com
SOIC−14
D SUFFIX
CASE 751A
SOEIAJ−14
F SUFFIX
CASE 965
TSSOP−14
DT SUFFIX
CASE 948G
PIN ASSIGNMENT
Rtc 1
Ctc 2
RS 3
NC 4
AR 5
MR 6
VSS 7
14 VDD
13 B
12 A
11 NC
10 MODE
9 Q/Q SEL
8Q
NC = NO CONNECTION
MARKING DIAGRAMS
14
14541BG
AWLYWW
1
SOIC−14
14
MC14541B
ALYWG
1
SOEIAJ−14
14
14
541B
ALYWG
G
1
TSSOP−14
A
WL, L
YY, Y
WW, W
G or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= 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, 2014
July, 2014 − Rev. 14
1
Publication Order Number:
MC14541B/D
1 page  
A 12
B 13
Rtc 1
Ctc 2
RS 3
OSC
RESET
MC14541B
EXPANDED BLOCK DIAGRAM
C
8-STAGE
COUNTER
28
RESET
210 213 216
C 8-STAGE
COUNTER
RESET
1 OF 4
MUX
8 Q
AUTO RESET
5
POWER-ON
RESET
VDD = PIN 14
VSS = PIN 7
6
MASTER RESET
FREQUENCY SELECTION TABLE
Number of
Counter Stages Count
AB
n
2n
0 0 13 8192
0 1 10 1024
1 0 8 256
11
16 65536
10
MODE
9
Q/Q
SELECT
TRUTH TABLE
State
Pin 0
1
Auto Reset, 5 Auto Reset
Operating
Auto Reset Disabled
Master Reset, 6 Timer Operational Master Reset On
Q / Q,
9 Output Initially Low Output Initially High
After Reset
After Reset
Mode,
10 Single Cycle Mode Recycle Mode
3
TO CLOCK
CIRCUIT
INTERNAL
RESET
RS
2
Ctc
RTC
1
Figure 3. Oscillator Circuit Using RC Configuration
http://onsemi.com
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MC14541B.PDF ] | |
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