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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 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.
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16 PDIP-16 P SUFFIX CASE 648 MC14521BCP AWLYYWW 1 16 SOIC-16 D SUFFIX CASE 751B 1 16 SOEIAJ-16 F SUFFIX CASE 966 1 MC14521B AWLYWW 14521B AWLYWW
* 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) (Note 2.)
Symbol VDD Vin, Vout Iin, Iout PD TA Tstg TL Parameter DC Supply Voltage Range Input or Output Voltage Range (DC or Transient) Input or Output Current (DC or Transient) per Pin Power Dissipation, per Package (Note 3.) Ambient Temperature Range Storage Temperature Range Lead Temperature (8-Second Soldering) Value - 0.5 to +18.0 - 0.5 to VDD + 0.5 10 500 - 55 to +125 - 65 to +150 260 Unit V V mA mW C C C
A = Assembly Location WL or L = Wafer Lot YY or Y = Year WW or W = Work Week
ORDERING INFORMATION
Device MC14521BCP MC14521BD MC14521BDR2 MC14521BF MC14521BFEL MC14521BFR2 Package PDIP-16 SOIC-16 SOIC-16 SOEIAJ-16 SOEIAJ-16 SOEIAJ-16 Shipping 2000/Box 48/Rail 2500/Tape & Reel See Note 1. See Note 1. See Note 1.
2. Maximum Ratings are those values beyond which damage to the device may occur. 3. 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, Vin and Vout should be constrained (Vin or Vout) VDD. to the range VSS Unused inputs must always be tied to an appropriate logic voltage level (e.g., either VSS or VDD). Unused outputs must be left open.
1. For ordering information on the EIAJ version of the SOIC packages, please contact your local ON Semiconductor representative.
v
v
(c) Semiconductor Components Industries, LLC, 2000
1
March, 2000 - Rev. 3
Publication Order Number: MC14521B/D
MC14521B
PIN ASSIGNMENT
Q24 RESET VSS OUT 2 VDD IN 2 1 2 3 4 5 6 7 VSS 8 16 15 14 13 12 11 10 9 VDD Q23 Q22 Q21 Q20 Q19 Q18 IN 1
BLOCK DIAGRAM
RESET 2 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
9 IN 1
6 IN 2
STAGES 1 THRU 17 VDD = PIN 16 VSS = PIN 8
STAGES 18 THRU 24 Q18 Q19 Q20 Q21 Q22 Q23 Q24
7 OUT 1
5 VDD
VSS
3
4 OUT2
10
11
12
13
14
15
1
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ELECTRICAL CHARACTERISTICS (Voltages Referenced to VSS)
Characteristic Symbol VOL VDD Vdc 5.0 10 15 5.0 10 15 5.0 10 15 VIH 5.0 10 15 IOH Source Pins 4 & 7 5.0 5.0 10 15 5.0 5.0 10 15 IOL 5.0 10 15 15 -- 5.0 10 15 5.0 10 15 - 1.2 - 0.25 - 0.62 - 1.8 - 3.0 - 0.64 - 1.6 - 4.2 0.64 1.6 4.2 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 0.1 -- 5.0 10 20 - 1.0 - 0.2 - 0.5 - 1.5 - 2.4 - 0.51 - 1.3 - 3.4 0.51 1.3 3.4 -- -- -- -- -- - 1.7 - 0.36 - 0.9 - 3.5 - 4.2 - 0.88 - 2.25 - 8.8 0.88 2.25 8.8 0.00001 5.0 0.005 0.010 0.015 -- -- -- -- -- -- -- -- -- -- -- 0.1 7.5 5.0 10 20 - 0.7 - 0.14 - 0.35 - 1.1 - 1.7 - 0.36 - 0.9 - 2.4 0.36 0.9 2.4 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 1.0 -- 150 300 600 mAdc 3.5 7.0 11 -- -- -- 3.5 7.0 11 2.75 5.50 8.25 -- -- -- 3.5 7.0 11 -- -- -- mAdc Min -- -- -- - 55_C 25_C 125_C Max Min -- -- -- Typ (4.) 0 0 0 Max Min -- -- -- Max Unit Vdc Output Voltage Vin = VDD or 0 "0" Level 0.05 0.05 0.05 -- -- -- 1.5 3.0 4.0 0.05 0.05 0.05 -- -- -- 1.5 3.0 4.0 0.05 0.05 0.05 -- -- -- 1.5 3.0 4.0 Vdc "1" Level Vin = 0 or VDD Input Voltage "0" Level (VO = 4.5 or 0.5 Vdc) (VO = 9.0 or 1.0 Vdc) (VO = 13.5 or 1.5 Vdc) "1" Level (VO = 0.5 or 4.5 Vdc) (VO = 1.0 or 9.0 Vdc) (VO = 1.5 or 13.5 Vdc) Output Drive Current (VOH = 2.5 Vdc) (VOH = 4.6 Vdc) (VOH = 9.5 Vdc) (VOH = 13.5 Vdc) VIL -- -- -- -- -- -- 2.25 4.50 6.75 -- -- -- VOH 4.95 9.95 14.95 4.95 9.95 14.95 5.0 10 15 4.95 9.95 14.95 Vdc Vdc (VOH = 2.5 Vdc) Source (VOH = 4.6 Vdc) Pins 1, 10, (VOH = 9.5 Vdc) 11, 12, 13, 14 (VOH = 13.5 Vdc) and 15 (VOL = 0.4 Vdc) (VOL = 0.5 Vdc) (VOL = 1.5 Vdc) Input Current Input Capacitance (Vin = 0) Quiescent Current (Per Package) Total Supply Current (5.) (6.) (Dynamic plus Quiescent, Per Package) (CL = 50 pF on all outputs, all buffers switching) Sink mAdc Iin Cin IDD Adc pF Adc IT IT = (0.42 A/kHz) f + IDD IT = (0.85 A/kHz) f + IDD IT = (1.40 A/kHz) f + IDD Adc 4. Data labelled "Typ" is not to be used for design purposes but is intended as an indication of the IC's potential performance. 5. The formulas given are for the typical characteristics only at 25_C. 6. To calculate total supply current at loads other than 50 pF: IT(CL) = IT(50 pF) + (CL - 50) Vfk where: IT is in A (per package), CL in pF, V = (VDD - VSS) in volts, f in kHz is input frequency, and k = 0.003.
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MC14521B
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SWITCHING CHARACTERISTICS (7.) (CL = 50 pF, TA = 25_C)
Characteristic Symbol VDD Vdc 5.0 10 15 tPHL, tPLH 5.0 10 15 5.0 10 15 tPHL 5.0 10 15 tWH(cl) 5.0 10 15 5.0 10 15 5.0 10 15 5.0 10 15 5.0 10 15 -- -- -- 385 150 120 -- -- -- -- -- -- 1400 600 450 30 0 - 40 1300 500 375 140 55 40 3.5 9.0 12 -- -- -- 700 300 225 - 200 - 160 - 110 2600 1000 750 -- -- -- 2.0 5.0 6.5 15 5.0 4.0 -- -- -- -- -- -- ns -- -- -- -- -- -- 4.5 1.7 1.3 6.0 2.2 1.7 9.0 3.5 2.7 12 4.5 3.5 ns Min -- -- -- Typ (8.) 100 50 40 Max 200 100 80 s Unit ns Output Rise and Fall Time (Counter Outputs) tTLH, tTHL = (1.5 ns/pF) CL + 25 ns tTLH, tTHL = (0.75 ns/pF) CL + 12.5 ns tTLH, tTHL = (0.55 ns/pF) CL + 12.5 ns Propagation Delay Time Clock to Q18 tPHL, tPLH = (1.7 ns/pF) CL + 4415 ns tPHL, tPLH = (0.66 ns/pF) CL + 1667 ns tPHL, tPLH = (0.5 ns/pF) CL + 1275 ns Clock to Q24 tPHL, tPLH = (1.7 ns/pF) CL + 5915 ns tPHL, tPLH = (0.66 ns/pF) CL + 2167 ns tPHL, tPLH = (0.5 ns/pF) CL + 1675 ns Propagation Delay Time Reset to Qn tPHL = (1.7 ns/pF) CL + 1215 ns tPHL = (0.66 ns/pF) CL + 467 ns tPHL = (0.5 ns/pF) CL + 350 ns Clock Pulse Width tTLH, tTHL Clock Pulse Frequency fcl MHz Clock Rise and Fall Time tTLH, tTHL s Reset Pulse Width tWH(R) ns Reset Removal Time trem ns 7. The formulas given are for the typical characteristics only at 25_C. 8. Data labelled "Typ" is not to be used for design purposes but is intended as an indication of the IC's potential performance. VDD 500 F VDD PULSE GENERATOR IN 2 0.01 F CERAMIC VDD Q18 Q19 Q20 Q21 Q22 Q23 Q24 CL VSS CL Vin 20 ns 90% 10% 50% DUTY CYCLE 20 ns VDD 0V ID CL CL CL CL CL 50% R VSS
Figure 1. Power Dissipation Test Circuit and Waveform
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MC14521B
VDD VDD PULSE GENERATOR IN 2 VDD Q18 Q19 Q20 Q21 Q22 Q23 Q24 VSS CL IN 2 CL CL CL CL CL CL Qn 50% 10% tWL 90% 10% tPLH tTLH tPHL tTHL 20 ns 50% 20 ns 90% tWH 20 ns
R VSS
Figure 2. Switching Time Test Circuit and Waveforms
Characteristic Crystal Characteristics Resonant Frequency Equivalent Resistance, RS VDD Ro VDD R* VDD External Resistor/Capacitor Values Ro CT CS Frequency Stability Frequency Change as a Function of VDD (TA = 25_C) VDD Change from 5.0 V to 10 V VDD Change from 10 V to 15 V Frequency Change as a Function of Temperature (VDD = 10 V) TA Change from - 55_C to + 25_C MC14521 only Complete Oscillator* TA Change from + 25_C to + 125_C MC14521 only Complete Oscillator*
500 kHz Circuit 500 1.0 47 82 20
50 kHz Circuit 50 6.2 750 82 20
Unit kHz k k pF pF
18 M
CS
CT
IN 1 OUT 1 OUT 2 Q18 Q19 IN 2 Q20 Q21 Q22 Q23 R Q24 VSS VSS R*
+ 6.0 + 2.0 - 4.0 + 100
+ 2.0 + 2.0 - 2.0 + 120
ppm ppm ppm ppm
- 2.0 - 160
- 2.0 - 560
ppm ppm
Figure 3. Crystal Oscillator Circuit
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Figure 4. Typical Data for Crystal Oscillator Circuit http://onsemi.com
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* Optional for low power operation, 10 k R 70 k.
*Complete oscillator includes crystal, capacitors, and resistors.
MC14521B
100 8.0 VDD = 15 V FREQUENCY DEVIATION (%) 4.0 0 -4.0 -8.0 -12 -16 -55
RTC = 56 k, C = 1000 pF
TEST CIRCUIT FIGURE 7
f, OSCILLATOR FREQUENCY (kHz)
50 20 10 5.0 2.0 1.0 0.5 0.2 f AS A FUNCTION OF C (RTC = 56 k) (RS = 120 k)
VDD = 10 V
TEST CIRCUIT FIGURE 7 f AS A FUNCTION OF RTC (C = 1000 pF) (RS 2RTC)
10 V
5.0 V
{
RS = 0, f = 10.15 kHz @ VDD = 10 V, TA = 25C RS = 120 k, f = 7.8 kHz @ VDD = 10 V, TA = 25C
0.1 1.0 k 125 0.0001 10 k 100 k RTC, RESISTANCE (OHMS) 0.001 0.01 C, CAPACITANCE (F) 1.0 m 0.1
-25 0 25 50 75 100 TA, AMBIENT TEMPERATURE (C), DEVICE ONLY
Figure 5. RC Oscillator Stability
Figure 6. RC Oscillator Frequency as a Function of RTC and C
VDD VDD IN 1 Q18 Q19 Q20 Q21 IN 2 Q22 Q23 Q24 OUT 1 R OUT 2 VSS VSS
RS C
RTC
VDD
VDD IN 1
VDD
IN 2
R
OUT 1 OUT 2 Q18 Q19 Q20 Q21 Q22 Q23 Q24 VSS
PULSE GENERATOR
VSS
Figure 7. RC Oscillator Circuit
Figure 8. Functional Test Circuit
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MC14521B
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FUNCTIONAL TEST SEQUENCE
Inputs Reset In 2 Out 2 VSS Outputs VDD Comments Q18 thru Q24 0 1 A test function (see Figure 8) has been included for the reduction of test time required to exercise all 24 counter stages. This test function divides the counter into three 8-stage sections, and 255 counts are loaded in each of the 8-stage sections in parallel. All flip-flops are now at a logic "1". The counter is now returned g to the normal 24-stages in series configuration. One more pulse is entered into Input 2 (In 2) which will cause the counter to ripple from an all "1" state to an all "0" state. 0 0 1 0 1 -- -- -- 1 0 0 1 1 0 0 1 0 1 -- -- -- 1 0 0 Gd Gnd 0 0 1 VDD 1 1 0 1 1 1 Counter converted back to 24-stages in series mode. Out 2 converts back to an output. Counter ripples from an all "1" state to an all "0" stage. VDD Gnd Counter is in three 8-stage sections in parallel mode Counter is reset. In 2 and Out 2 are connected together First "0" to "1" transition on In 2, Out 2 node. 255 "0" to "1" transitions are clocked into this In 2, Out 2 node. The 255th "0" to "1" transition.
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MC14521B
LOGIC DIAGRAM
VDD 5 RESET 2
9 IN 1
1
2
STAGES 3 THRU 7
8
6 IN 2 7 OUT 1 3 VSS
4 OUT 2
9
10
STAGES 11 THRU 15
16
17
18
19
20
21
22
23
24
10 Q18
11 Q19
12 Q20
13 Q21
14 Q22
15 Q23
1 Q24
VDD = PIN 16 VSS = PIN 8
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MC14521B
PACKAGE DIMENSIONS
-A-
16 9
PDIP-16 P SUFFIX PLASTIC DIP PACKAGE CASE 648-08 ISSUE R
B
1
8
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01
F S
C
L
-T- H G D
16 PL
SEATING PLANE
K
J TA
M
M
0.25 (0.010)
M
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MC14521B
PACKAGE DIMENSIONS
SOIC-16 D SUFFIX PLASTIC SOIC PACKAGE CASE 751B-05 ISSUE J
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019
-A-
16
9
-B-
1 8
P
8 PL
0.25 (0.010)
M
B
S
G F
K C -T-
SEATING PLANE
R
X 45 _
M D
16 PL M
J
0.25 (0.010)
TB
S
A
S
DIM A B C D F G J K M P R
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MC14521B
PACKAGE DIMENSIONS
SOEIAJ-16 F SUFFIX PLASTIC EIAJ SOIC PACKAGE CASE 966-01 ISSUE O
LE Q1 E HE
1 8
16
9
M_ L DETAIL P
Z D e A VIEW P
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS D AND E DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS AND ARE MEASURED AT THE PARTING LINE. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 5. THE LEAD WIDTH DIMENSION (b) DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE LEAD WIDTH DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS OR THE FOOT. MINIMUM SPACE BETWEEN PROTRUSIONS AND ADJACENT LEAD TO BE 0.46 ( 0.018). DIM A A1 b c D E e HE L LE M Q1 Z MILLIMETERS MIN MAX --- 2.05 0.05 0.20 0.35 0.50 0.18 0.27 9.90 10.50 5.10 5.45 1.27 BSC 7.40 8.20 0.50 0.85 1.10 1.50 10 _ 0_ 0.70 0.90 --- 0.78 INCHES MIN MAX --- 0.081 0.002 0.008 0.014 0.020 0.007 0.011 0.390 0.413 0.201 0.215 0.050 BSC 0.291 0.323 0.020 0.033 0.043 0.059 10 _ 0_ 0.028 0.035 --- 0.031
c
b 0.13 (0.005)
M
A1 0.10 (0.004)
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MC14521B
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
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MC14521B/D

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