MC14541B Datasheet, PDF (1/8 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.
• 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)
MAXIMUM RATINGS (Voltages Referenced to V_SS) (Note 2.)
Symbol
Parameter
Value
Unit
V_DD
DC Supply Voltage Range
– 0.5 to +18.0
V
V_in, V_out Input or Output Voltage Range – 0.5 to V_DD + 0.5
V
(DC or Transient)
I_in
Input Current (DC or Transient)
± 10 (per Pin)
mA
I_out
Output Current (DC or Transient)
± 45 (per Pin)
mA
P_D
Power Dissipation,
per Package (Note 3.)
500
mW
T_A
Ambient Temperature Range
T_stg
Storage Temperature Range
T_L
Lead Temperature
(8–Second Soldering)
– 55 to +125
°C
– 65 to +150
°C
260
°C
2. Maximum Ratings are those values beyond which damage to the device
may occur.
3. Temperature Derating:
Plastic “P and D/DW” Packages: – 7.0 mW/_C From 65_C To 125_C
http://onsemi.com
MARKING
DIAGRAMS
14
PDIP–14
P SUFFIX
MC14541BCP
CASE 646
AWLYYWW
1
14
SOIC–14
D SUFFIX
CASE 751A
1
14541B
AWLYWW
TSSOP–14
14
14
DT SUFFIX
541B
CASE 948G
ALYW
14
SOEIAJ–14
F SUFFIX
CASE 965
1
MC14541B
AWLYWW
1
A
= Assembly Location
WL or L = Wafer Lot
YY or Y = Year
WW or W = Work Week
ORDERING INFORMATION
Device
Package
Shipping
MC14541BCP
MC14541BD
MC14541BDR2
PDIP–14
2000/Box
SOIC–14
55/Rail
SOIC–14 2500/Tape & Reel
MC14541BDT
TSSOP–14
96/Rail
MC14541BDTR2 TSSOP–14 2500/Tape & Reel
MC14541BF
SOEIAJ–14 See Note 1.
MC14541BFEL SOEIAJ–14 See Note 1.
1. For ordering information on the EIAJ version of
the SOIC packages, please contact your local
ON Semiconductor representative.
This device contains protection circuitry to guard
against damage due to high static voltages or electric
fields. However, precautions must be taken to avoid ap-
plications of any voltage higher than maximum rated
voltages to this high–impedance circuit. For proper
v v ^{operation, Vin and Vout should be constrained to the}
range V_SS (V_in or V_out) V_DD.
Unused inputs must always be tied to an appropriate
logic voltage level (e.g., either V_SS or V_DD). Unused out-
puts must be left open.
© Semiconductor Components Industries, LLC, 2000
1
March, 2000 – Rev. 6
Publication Order Number:
MC14541B/D