MC14521B Datasheet, PDF (1/8 Pages) ON Semiconductor – 24-Stage Frequency Divider

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{• Capable of Driving Two Low–power TTL Loads or One Low–power}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{Schottky TTL Load over the Rated Temperature Range.}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{MAXIMUM RATINGS* (Voltages Referenced to VSS)}
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _Symbol
Parameter
Value
Unit
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ VDD DC Supply Voltage
– 0.5 to + 18.0
V
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ^{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),
± 10
mA
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{per Pin}
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
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ * 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
MC14520B
See Page 6-292
MC14521B
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
Q24 1
RESET 2
VSS′ 3
OUT 2 4
VDD′ 5
IN 2 6
OUT 1 7
VSS 8
16 VDD
15 Q23
14 Q22
13 Q21
12 Q20
11 Q19
10 Q18
9 IN 1
RESET
2
BLOCK DIAGRAM
9
6
IN 1
IN 2
STAGES
1 THRU 17
STAGES
18 THRU 24
Q18 Q19 Q20 Q21 Q22 Q23 Q24
7
OUT 1
5
4
VDD′ ³ OUT2
VSS′
VDD = PIN 16
VSS = PIN 8
10 11 12 13 14 15 1
Output
Q18
Q19
Q20
Q21
Q22
Q23
Q24
Count Capacity
218 = 262,144
219 = 524,288
220 = 1,048,576
221 = 2,097,152
222 = 4,194,304
223 = 8,388,608
224 = 16,777,216
REV 3
1/94
©MMOotoTrOolaR, IOncL. A199C5MOS LOGIC DATA
MC14521B
1