SEMICONDUCTOR TECHNICAL DATA
L SUFFIX
CERAMIC
CASE 620
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 2 = 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.
24
P SUFFIX
PLASTIC
CASE 648
•
•
•
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
D SUFFIX
SOIC
•
•
Test Mode to Reduce Test Time
CASE 751B
V
′ and V ′ Pins Brought Out on Crystal Oscillator Inverter to Allow
SS
DD
ORDERING INFORMATION
the Connection of External Resistors for Low–Power Operation
MC14XXXBCP
MC14XXXBCL
MC14XXXBD
Plastic
Ceramic
SOIC
•
•
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.
T
A
= – 55° to 125°C for all packages.
MAXIMUM RATINGS* (Voltages Referenced to V
)
SS
Symbol
Parameter
DC Supply Voltage
Value
Unit
V
V
– 0.5 to + 18.0
DD
V , V
PIN ASSIGNMENT
Input or Output Voltage (DC or Transient)
– 0.5 to V
DD
+ 0.5
V
in out
Q24
RESET
1
2
16
15
V
DD
I , I
in out
Input or Output Current (DC or Transient),
per Pin
± 10
mA
Q23
P
D
Power Dissipation, per Package†
Storage Temperature
500
mW
C
V
′
3
4
5
6
7
8
14
13
12
11
10
9
Q22
Q21
Q20
Q19
Q18
IN 1
SS
OUT 2
T
stg
– 65 to + 150
260
T
L
Lead Temperature (8–Second Soldering)
C
V
′
DD
* Maximum Ratings are those values beyond which damage to the device may occur.
†Temperature Derating:
IN 2
OUT 1
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
V
SS
BLOCK DIAGRAM
RESET
2
Output
Count Capacity
18
2
19
2
20
2
21
2
22
2
23
2
24
2
Q18
Q19
Q20
Q21
Q22
Q23
Q24
= 262,144
= 524,288
STAGES
1 THRU 17
STAGES
18 THRU 24
Q18 Q19 Q20 Q21 Q22 Q23 Q24
= 1,048,576
= 2,097,152
= 4,194,304
= 8,388,608
= 16,777,216
9
IN 1
6
IN 2
V
V
= PIN 16
= PIN 8
DD
SS
5
DD
4
3
7
10 11 12 13 14 15
1
V
′
OUT2
OUT 1
V
′
SS
REV 3
1/94
Motorola, Inc. 1995
MOTOROLA CMOS LOGIC DATA
MC14521B
1