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MC14521B_06

更新时间： 2024-09-09 04:59:27
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安森美 - ONSEMI /
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24−Stage Frequency Divider

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MC14521B_06 数据手册

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MC14521B  
24−Stage Frequency Divider  
The MC14521B consists of a chain of 24 flip−flops 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 flip−flop divides the frequency of the previous flip−flop  
24  
by two, consequently this part will count up to 2 = 16,777,216. The  
http://onsemi.com  
count advances on the negative going edge of the clock. The outputs of  
the last seven−stages are available for added flexibility.  
MARKING  
Features  
DIAGRAMS  
• All Stages are Resettable  
16  
• Reset Disables the RC Oscillator for Low Standby Power Drain  
PDIP−16  
P SUFFIX  
CASE 648  
MC14521BCP  
AWLYYWWG  
• RC and Crystal Oscillator Outputs Are Capable of Driving External  
Loads  
1
1
• Test Mode to Reduce Test Time  
• V ′ and V ′ Pins Brought Out on Crystal Oscillator Inverter to  
DD  
SS  
16  
SOIC−16  
D SUFFIX  
CASE 751B  
Allow the Connection of External Resistors for Low−Power Operation  
14521BG  
AWLYWW  
• Supply Voltage Range = 3.0 Vdc to 18 Vdc  
1
1
• Capable of Driving Two Low−Power TTL Loads or One Low−Power  
Schottky TTL Load over the Rated Temperature Range  
• Pb−Free Packages are Available*  
16  
SOEIAJ−16  
F SUFFIX  
CASE 966  
MC14521B  
ALYWG  
MAXIMUM RATINGS (Voltages Referenced to V  
)
SS  
1
1
Parameter  
Symbol  
Value  
Unit  
V
DC Supply Voltage Range  
V
−0.5 to +18.0  
DD  
A
= Assembly Location  
WL, L = Wafer Lot  
YY, Y = Year  
WW, W = Work Week  
Input or Output Voltage Range  
(DC or Transient)  
V , V  
in out  
−0.5 to V  
+0.5  
V
DD  
Input or Output Current (DC or Transient)  
per Pin  
I , I  
in out  
10  
mA  
G
= Pb−Free Package  
Power Dissipation, per Package (Note 1)  
Ambient Temperature Range  
P
T
500  
mW  
°C  
D
−55 to +125  
−65 to +150  
260  
A
ORDERING INFORMATION  
Storage Temperature Range  
T
stg  
°C  
See detailed ordering and shipping information in the package  
dimensions section on page 2 of this data sheet.  
Lead Temperature (8−Second Soldering)  
T
°C  
L
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 “P and D/DW”  
Packages: – 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  
high−impedance circuit. For proper operation, V and V should be constrained  
in  
out  
to the range V v (V or V ) v V  
.
SS  
in  
out  
DD  
Unused inputs must always be tied to an appropriate logic voltage level  
(e.g., either V or V ). Unused outputs must be left open.  
SS  
DD  
*For additional information on our Pb−Free strategy and soldering details, please  
download the ON Semiconductor Soldering and Mounting Techniques  
Reference Manual, SOLDERRM/D.  
©
Semiconductor Components Industries, LLC, 2006  
1
Publication Order Number:  
June, 2006 − Rev. 6  
MC14521B/D  
 
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