HCF4521B 24 STAGE FREQUENCY DIVIDER ■ ■ ■ ■ ■ ■ VERY LOW QUIESCENT CURRENT HIGH NOISE IMMUNITY VOLTAGE SUPPLY RANGE 3V TO 18V ALL STAGES ARE RESETTABLE RESET DISABLES THE RC OSCILLATORFOR LOW STANDBY POWER DRAIN RC AND CRYSTAL OSCILLATOR OUTPUT ARE CAPABLE OF DRIVING EXTERNAL LOADS DESCRIPTION The HCF4521B is a monolithic integrated circuit, available in 16-lead dual-in-line plastic package and plastic micro packages. The HCF4521B have a chain of 24 flip-flops with an input circuit that allows three modes of operation. The input circuit functions as a crystal or an RC oscillator or as an input buffer for an external oscillator. Each flip-flop performs a divide-by-two function giving a total count of 224 = 16,777,216. The count advances on the negative going edge of the clock. Access is available to the final seven stages giving the device added flexibility. EY M1 (Plastic Package) (Micro Package) ORDER CODES : HCF4521BEY HCF4521BM1 PIN CONNECTION February 1999 1/12 HCF4521 BLOCK DIAGRAM ABSOLUTE MAXIMUM RATING Symbol VDD * Parameter Supply Voltage Value Unit -0.5 to +18 V -0.5 to VDD + 0.5 V Vi Input Voltage II DC Input Current (any one input) ± 10 mA Total Power Dissipation (per package) Dissipation per Output Transistor for Top = Full Package Temperature Range 200 mW 100 mW Ptot Top Operating Temperature -40 to +85 o Tstg Storage Temperature -65 to +150 o C C Stresses above those listedunder ”Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation ofthe device atthese or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum ratingconditions for external periods may affect device reliability. * Allvoltage values are referred to VSS pin voltage. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Value Unit Supply Voltage 3 to 15 V VI Input Voltage 0 to VDD V Top Operating Temperature VDD 2/12 -40 to +85 o C HCF4521 FUNCTIONAL DIAGRAM 3/12 HCF4521 STATIC ELECTRICAL CHARACTERISTICS (over recommended operating conditions, voltages References to VSS) Symb ol Parameter T est Cond it ios VO |IO | V DD -40 (µA) (V) Min. (V) 0/5 5 0/10 10 0/15 15 0/5 <1 5 4.95 0/10 < 1 10 9.95 0/15 < 1 15 14.95 5/0 <1 5 10/0 < 1 10 15/0 < 1 15 0.5/4.5 < 1 5 3.5 1/9 < 1 10 7 1.5/13.5 < 1 15 11 4.5/0.5 < 1 5 9/1 < 1 10 13.5/1.5 < 1 15 0/5 2.5 5 -1.53 0/5 4.6 5 -0.52 0/10 9.5 10 -1.3 0/15 13.5 15 -3.5 0/5 0.4 5 0.52 0/10 0.5 10 1.3 0/15 1.5 15 3.6 VI (V) IL VOH VOL VIH VIL IOH IOL IIH, IIL CI Quiescent Current Output High Voltage Output Low Voltage Input High Voltage Input Low Voltage Output Drive Current Output Sink Current Input Leakage Current Input Capacitance 0/18 Any Input Any Input 18 Valu e o C 25 C Max. Min. T yp. 20 0.04 40 0.04 80 0.04 4.95 9.95 14.95 0.05 0.05 0.05 3.5 7 11 1.5 3 4 -1.36 -3.2 -0.44 -1 -1.1 -2.6 -3.0 -6.8 0.44 1 1.1 2.6 3.0 6.8 o ±0.1 Un it 85 o C Max. Min . Max. 20 150 40 300 80 600 4.95 9.95 14.95 0.05 0.05 0.05 0.05 0.05 0.05 3.5 7 11 1.5 1.5 3 3 4 4 -1.1 -0.36 -0.9 -2.4 0.36 0.9 2.4 ±10-5 ±0.1 5 7.5 TheNoise Margin for both ”1” and ”0” level is: 1V min.withV DD = 5 V, 2 V min.with VDD = 10 V, 2.5 V min. with VDD = 15 V 4/12 ±1 µA V V V V mA mA µA pF HCF4521 DYNAMIC ELECTRICAL CHARACTERISTICS (Tamb = 25 oC, CL = 50 pF, RL = 200 KΩ, typical temperaturecoefficent for all VDD values is 03 %/oC, all input rise and fall times= 20 ns) Symb ol tPLH tPHL Parameter Output Rise Time Output Fall Time tPHL tPLH Propagation Delay Time Clock to Q18 tPHL tPLH Propagation Delay Time Clock to Q24 tPHL Propagation Delay Time RESET to Qn tWH(cl) fcl Clock Pulse Width Clock Pulse Frequency tTLH tTHL Clock Rise and Fall Time tW(R) Reset Pulse Width T est Cond ition s V DD (V) 5 10 15 5 10 Min. Value Typ. Max. 100 50 40 100 50 200 100 80 200 100 15 5 10 15 5 10 15 40 4.5 1.7 1.3 6.0 2.2 1.7 80 9.0 3.5 2.7 12 4.5 3.5 5 10 1300 500 2600 1000 375 140 55 40 3.5 9 12 750 15 5 10 15 5 10 15 5 10 15 5 10 15 385 150 120 1400 600 450 700 300 225 Un it ns ns µs µs ns ns 2 5 6.5 MHz 15 15 15 µs ns 5/12 HCF4521 Typical Output Low (sink) Current Characteristics Minimum Output Low (sink) Current Characteristics Typical Output High (source) Current Characteristics Minimum Output High (source) Current Characteristics Typical Power Dissipation vs, Frequency 6/12 HCF4521 FUNCTIONAL TEST SEQUENCE Inpu ts Outpu ts Co mmen ts RESET In2 Out2 V SS ’ V DD ’ Q18 thru Q24 1 0 0 VDD GND 0 Counter is in three 8-stage sections in parallel mode. Counter is reset. In2 and Out2 are connected togheter 0 1 1 VDD GND 0 First ”0” to ”1” transition on In2, Out2 node. 0 0 0 VDD GND 0 0 1 1 VDD GND 0 255 ”0” to ”1” transitions are clocked into this In2, Out2 node. 0 1 1 VDD GND 1 The 255th ”0” to ”1” transition. 0 0 0 VDD GND 1 0 0 0 GND GND 1 0 1 0 GND VDD 1 Counter converted back to 24-stages in series mode. 0 1 0 GND VDD 1 Out2 converts back to an output 0 0 1 GND VDD 0 Counter ripples from an all ”1” state to an all ”0” stage. A test function (see fig.8) has been included forthe reduction oftest time required to exercise all 24 counter stages. This test function divides the counter intothree 8-stage sections and 255 counts are loaded in each of the 8-stage sections in parallel. All flip-flopare now ata logic ”1”. The counter is now returned to the normal 24-stages in series configuration. One more pulse is entered intoInput 2 (In2) which will cause the counter to ripple from an all ”1” state to an all ”0” state. RC Oscillator Circuit Functional Test Circuit 1 2.3 RTC C RS ≥ 2 RTC f in Hz, R in Ohms, C inFarads f≅ 7/12 HCF4521 TYPICAL DATA FOR CRYSTAL OSCILLATOR CIRCUIT Characteristic 500 kHz CIRCUIT 50 kHz CIRCUIT Un it Crystal Characteristics Resonant Frequency Equivalent Reistance, RS 500 1 50 6.2 kHz kΩ External Resistor/Capacitor Values RO CT CS 47 82 20 750 82 20 kΩ pF pF 6 2 2 2 ppm ppm -4 100 -2 120 ppm ppm -2 -160 -2 -560 ppm ppm Frequency Stability Frequency Change as a Function of VDD (TA = 25 oC) V DD Change from 5V to 10V V DD Change from 10V to 15V Frequency Change as a Function of Temperature (VDD = 10 V) T A Change from -55 oC to 25 oC HCF4521B only Complete Oscillator * T A Change from 25 oC to 125 oC HCF4521B only Complete Oscillator * * Complete oscillator includes crystal, capacitors and resistors. Crystal Oscillator Circuit * Optional forlow power operation. 8/12 HCF4521 TEST CIRCUITS Quiescent Device Current. Noise Immunity. Input Leakage Current. 9/12 HCF4521 Plastic DIP-16 (0.25) MECHANICAL DATA mm DIM. MIN. a1 0.51 B 0.77 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L Z 3.3 0.130 1.27 0.050 P001C 10/12 HCF4521 SO-16 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.004 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45 (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 e3 0.050 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.62 0.024 8 (max.) P013H 11/12 HCF4521 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a trademark of STMicroelectronics 1999 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com . 12/12