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MC14XXXBD bảng dữ liệu(PDF) 1 Page - Motorola, Inc

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Giải thích chi tiết về linh kiện  24-Stage Frequency Driver
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MC14XXXBD bảng dữ liệu(HTML) 1 Page - Motorola, Inc

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MOTOROLA CMOS LOGIC DATA
1
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 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
seven–stages are available for added flexibility.
• 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
• VDD′ and VSS′ Pins Brought Out on Crystal Oscillator Inverter to Allow
the Connection of External Resistors for Low–Power Operation
• Supply Voltage Range = 3.0 Vdc to 18 Vdc
• Capable of Driving Two Low–power TTL Loads or One Low–power
Schottky TTL Load over the Rated Temperature Range.
MAXIMUM RATINGS* (Voltages Referenced to VSS)
Symbol
Parameter
Value
Unit
VDD
DC Supply Voltage
– 0.5 to + 18.0
V
Vin, Vout Input or Output Voltage (DC or Transient)
– 0.5 to VDD + 0.5
V
Iin, Iout
Input or Output Current (DC or Transient),
per Pin
± 10
mA
PD
Power Dissipation, per Package†
500
mW
Tstg
Storage Temperature
– 65 to + 150
_C
TL
Lead Temperature (8–Second Soldering)
260
_C
* 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
BLOCK DIAGRAM
Output
Count Capacity
Q18
218 = 262,144
Q19
219 = 524,288
Q20
220 = 1,048,576
Q21
221 = 2,097,152
Q22
222 = 4,194,304
Q23
223 = 8,388,608
Q24
224 = 16,777,216
STAGES
18 THRU 24
STAGES
1 THRU 17
Q18 Q19 Q20 Q21 Q22 Q23 Q24
10
11
12
13
14
15
1
2
6
IN 2
9
IN 1
7
RESET
VDD = PIN 16
VSS = PIN 8
5
3
4
OUT 1
VDD′
VSS′
OUT2
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
© Motorola, Inc. 1995
REV 3
1/94
MC14520B
See Page 6-292
MC14521B
L SUFFIX
CERAMIC
CASE 620
ORDERING INFORMATION
MC14XXXBCP
Plastic
MC14XXXBCL
Ceramic
MC14XXXBD
SOIC
TA = – 55° to 125°C for all packages.
P SUFFIX
PLASTIC
CASE 648
D SUFFIX
SOIC
CASE 751B
PIN ASSIGNMENT
13
14
15
16
9
10
11
12
5
4
3
2
1
8
7
6
Q20
Q21
Q22
VDD
IN 1
Q18
Q19
OUT 2
VSS′
RESET
Q24
VSS
OUT 1
IN 2
VDD′
Q23


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