MC14541B Datasheet, PDF (1/7 Pages) ON Semiconductor – Programmable Timer

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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.
• 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
Disabled (Pin 5 = VDD)
= 8.5 Vdc to 18 Vdc with Auto Reset
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{Enabled (Pin 5 = VSS)}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{MAXIMUM RATINGS* (Voltages Referenced to VSS)}
Symbol
Parameter
Value
Unit
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{VDD DCSupplyVoltage}
– 0.5 to + 18.0
V
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ^{Vin, Vout Input or Output Voltage (DC or Transient) – 0.5 to VDD + 0.5 V}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ^Iin
Input Current (DC or Transient), per Pin
± 10
mA
Iout Output Current (DC or Transient), per Pin
± 45
mA
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{PD Power Dissipation, per Packageâ€} 
500
mW
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{Tstg Storage Temperature}
– 65 to + 150
_C
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _TL
Lead Temperature (8–Second Soldering)
260
_C
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{*Maximum Ratings are those values beyond which damage to the device may occur.}
†Temperature Derating:
Plastic “P and D/DW” Packages: – 7.0 mW/_C From 65_C To 125_C
Ceramic “L” Packages: – 12 mW/_C From 100_C To 125_C
MC14541B
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
D SUFFIX
SOIC
CASE 751B
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBD
Plastic
Ceramic
SOIC
TA = – 55° to 125°C for all packages.
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
REV 3
1/94
©MMOotoTrOolaR, IOncL. A199C5MOS LOGIC DATA
MC14541B
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