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MC14521B_06 Datasheet, PDF (1/9 Pages) ON Semiconductor – 24−Stage Frequency Divider | |||
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MC14521B
24âStage Frequency Divider
The MC14521B consists of a chain of 24 flipâflops with an input
circuit that allows three modes of operation. The input will function as a
crystal oscillator, an RC oscillator, or as an input buffer for an external
oscillator. Each flipâflop divides the frequency of the previous flipâflop
by two, consequently this part will count up to 224 = 16,777,216. The
count advances on the negative going edge of the clock. The outputs of
the last sevenâstages are available for added flexibility.
Features
⢠All Stages are Resettable
⢠Reset Disables the RC Oscillator for Low Standby Power Drain
⢠RC and Crystal Oscillator Outputs Are Capable of Driving External
Loads
⢠Test Mode to Reduce Test Time
⢠VDDⲠand VSSⲠPins Brought Out on Crystal Oscillator Inverter to
Allow the Connection of External Resistors for LowâPower Operation
⢠Supply Voltage Range = 3.0 Vdc to 18 Vdc
⢠Capable of Driving Two LowâPower TTL Loads or One LowâPower
Schottky TTL Load over the Rated Temperature Range
⢠PbâFree Packages are Available*
MAXIMUM RATINGS (Voltages Referenced to VSS)
Parameter
Symbol
Value
Unit
DC Supply Voltage Range
Input or Output Voltage Range
(DC or Transient)
VDD â0.5 to +18.0 V
Vin, Vout â0.5 to VDD V
+0.5
Input or Output Current (DC or Transient) Iin, Iout
per Pin
± 10
mA
Power Dissipation, per Package (Note 1)
PD
500
mW
Ambient Temperature Range
TA
â55 to +125 °C
Storage Temperature Range
Tstg
â65 to +150 °C
Lead Temperature (8âSecond Soldering)
TL
260
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum
Ratings are stress ratings only. Functional operation above the Recommended
Operating Conditions is not implied. Extended exposure to stresses above the
Recommended Operating Conditions may affect device reliability.
1. Temperature Derating: Plastic âP and D/DWâ
Packages: â 7.0 mW/_C From 65_C To 125_C
This device contains protection circuitry to guard against damage due to high
static voltages or electric fields. However, precautions must be taken to avoid
applications of any voltage higher than maximum rated voltages to this
highâimpedance circuit. For proper operation, Vin and Vout should be constrained
to the range VSS v (Vin or Vout) v VDD.
Unused inputs must always be tied to an appropriate logic voltage level
(e.g., either VSS or VDD). Unused outputs must be left open.
http://onsemi.com
1
1
MARKING
DIAGRAMS
PDIPâ16 16
P SUFFIX
CASE 648
1
MC14521BCP
AWLYYWWG
SOICâ16 16
D SUFFIX
CASE 751B
1
14521BG
AWLYWW
16
SOEIAJâ16
F SUFFIX
CASE 966
MC14521B
ALYWG
1
1
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G
= PbâFree Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
*For additional information on our PbâFree strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
1
June, 2006 â Rev. 6
Publication Order Number:
MC14521B/D
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