ICM7213. One Second/One Minute Timebase Generator. Features. Description. Ordering Information. Pinout. August 1997

Transcription

1 August 997 Features Guarateed V Operatio Very Low Curret Cosumptio (Typ).... µa at V All Outputs TTL Compatible O Chip Oscillator Feedback Resistor Oscillator Requires Oly Exteral compoets: Fixed Capacitor, Trim Capacitor, ad A Quartz Crystal Output Ihibit Fuctio Simultaeous Outputs: Oe Pulse/s, Oe Pulse/Mi, Hz ad Composite + + Hz Outputs Test Speed-Up Provides Other Frequecy Outputs Orderig Iformatio PART NUMBER TEMP. RANGE ( o C) PACKAGE PKG. NO. Descriptio Oe Secod/Oe Miute Timebase Geerator The ICM7 is a fully itegrated micropower oscillator ad frequecy divider with four buffered outputs suitable for iterfacig with most logic families. The power supply may be either a two battery stack (Ni-cad, alkalie, etc.) or a regular power supply greater tha V. Depedig upo the state of the,, ad TEST iputs, usig a.9mhz crystal will produce a variety of output frequecies icludig 8Hz, Hz,.Hz, Hz, Hz, ad / Hz (plus composites). The ICM7 utilizes a very high speed low power metal gate CMOS techology which uses.v zeers betwee the drais ad sources of each trasistor ad also across the supply termials. Cosequetly, the ICM7 is limited to a V maximum V SUPPLY, although a simple droppig etwork ca be used to exted the V SUPPLY rage well above V (See Figure 9). ICM7IPD - to 8 Ld PDIP E. Piout ICM7 (PDIP) TOP VIEW OUT OUT TEST OSC OUT OSC IN 9 N/C N/C 7 8 N/C CAUTION: These devices are sesitive to electrostatic discharge; follow proper IC Hadlig Procedures. or Copyright Itersil Corporatio File Number.

2 Fuctioal Block Diagram (,9,Hz) (89Hz) (Hz) (Hz) (Hz) (Hz) OSC IN OSCILLATOR 9 R F OSC OUT ( / Hz) ( / Hz) (Hz) (Hz) ( x x ) OR RESET TEST OUT OUT 9-

3 Absolute Maximum Ratigs Supply Voltage ( - ) V Output Curret (Ay Output) ma All Iput ad Oscillator Voltages V to +.V All Output Voltages to V Operatig Coditios Temperature Rage o C to 8 o C Thermal Iformatio Thermal Resistace (Typical, Note ) θ JA ( o C/W) PDIP Package Maximum Juctio Temperature o C Maximum Storage Temperature Rage o C to o C Maximum Lead Temperature (Solderig, s) o C CAUTION: Stresses above those listed i Absolute Maximum Ratigs may cause permaet damage to the device. This is a stress oly ratig ad operatio of the device at these or ay other coditios above those idicated i the operatioal sectios of this specificatio is ot implied. NOTE:. θ JA is measured with the compoet mouted o a evaluatio PC board i free air. Electrical Specificatios - =.V, f OSC =.9MHz, Test Circuit, T A = o C, Uless Otherwise Specified PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Supply Curret, I DD - µa Guarateed Operatig Supply Voltage Rage ( - ), V SUPPLY - o C to 8 o C - V Output Leakage Curret, I OLK Ay output, V OUT = V - - µa Output Sat. Resistace, R OUT Ay output, I OLK =.ma - Ω Ihibit Iput Curret, I I Ihibit termial coected to - µa Test Poit Iput Curret, I TP Test poit termial coected to - µa Width Iput Curret, I W Width termial coected to - µa Oscillator Trascoductace, g M = V - - µs Oscillator Frequecy Rage (Note ), f OSC - MHz Oscillator Stability, f STAB V < < V -. - ppm Oscillator Start Time, t S -. - s = V -. - s NOTE:. The ICM7 uses dyamic dividers for high frequecy divisio. As with ay dyamic system, iformatio is stored o very small odal capacitaces istead of latches (static system), therefore there is a lower frequecy of operatio. Dyamic dividers are used to improve the high frequecy performace while at the same time sigificatly decreasig power cosumptio. At low V SUPPLY, operatio at less tha MHz is possible. Output Defiitios (NOTE ) INPUT STATES TEST PIN OUT PIN OUT PIN PIN L L L Hz Hz ( 8 ) Composite Hz, 7.8ms /Hz, s ( x x ) L L H Hz Hz ( 8 ) Composite Hz, 7.8ms / Hz, ms L H L Hz 8 + Hz ( 8 ) Composite OFF OFF L H H Hz 8 + Hz ( 8 ) Composite OFF See Waveforms H L L ON 9 + Hz ( ) Composite 8Hz.Hz, % DC ( x x ) H L H ON 9 + Hz ( ) Composite 8Hz.Hz, % DC ( x x ) H H L ON Hz ON OFF H H H ON Hz ON OFF NOTE:. Whe TEST ad RESET are coected to groud, or left ope, all outputs except for ad have a % duty cycle. 9-

4 Timig Waveforms OUT Hz Hz Hz FIGURE. OUTPUT WAVEFORM CASE OUT.7s to.s <7.8ms CASE (PULSE COINCIDENT WITH ) <7.8ms <7.8ms 9.7s to s <ms CASE (EFFECT OF ON ) t ICS CASE (EFFECT OF ON ) s FIGURE. EFFECT OF THE (TEST CONNECTED TO OR LEFT OPEN) Typical Performace Curves SUPPLY CURRENT (µa) 9 8 V SUPPLY = V C IN = C OUT = pf F OSC =.9MHz TEMPERATURE ( o C) FIGURE. SUPPLY CURRENT AS A FUNCTION OF TEMPERATURE SUPPLY CURRENT, I DD (µa) T A = o C f OSC =.9 MHz C IN = C OUT = pf C IN = C OUT = pf.... SUPPLY VOLTAGE - (V) FIGURE. SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE 9-

5 Typical Performace Curves (Cotiued) OUTPUT CURRENT - ma T A = o C V SUPPLY = V V SUPPLY = V V SUPPLY = V OUTPUT SATURATION VOLTAGE (ANY OUTPUT) (V) FIGURE. OUTPUT CURRENT AS A FUNCTION OF OUTPUT SATURATION VOLTAGE OSCILLATOR FREQUENCY DEVIATION, f/f IN ppm = V C IN, C OUT AND QUARTZ CRYSTAL MAINTAINED AT o C f OSC =.9MHz TEMPERATURE ( o C) FIGURE. OSCILLATOR STABILITY AS A FUNCTION OF DEVICE TEMPERATURE OSCILLATOR FREQUENCY DEVIATION, f/f IN ppm T A = o C f OSC =.9MHz C IN = C OUT = pf C IN = C OUT = pf VOLTAGE SUPPLY OPERATING WINDOW -... SUPPLY VOLTAGE - (V). khz khz MHz MHz FIGURE 7. OSCILLATOR STABILITY AS A FUNCTION OF SUPPLY VOLTAGE FIGURE 8. WINDOW OF CORRECT OPERATION Test Circuit N.O. N.O. ICM7 N.O. T.P. CRYSTAL PARAMETER f =.9MHz RS = Ω (PARALLEL RESONANT) CM = 7mpF CO =.pf pf pf I DD + V SUPPLY - 9-

6 Detailed Descriptio V S + Supply Voltage Cosideratios The ICM7 may be used to provide various precisio outputs with frequecies from 8Hz to / Hz usig a.9mhz quartz oscillator, ad other output frequecies may be obtaied usig other quartz crystal frequecies. Sice the ICM7 uses dyamic high frequecy dividers for the iitial frequecy divisio there are limitatios o the V SUPPLY rage depedig o the oscillator frequecy. If, for example, a low frequecy quartz crystal is selected, the V SUPPLY should be selected i the ceter of the operatig widow, or approximately.7v. The V SUPPLY to the ICM7 may be derived from a high voltage supply by usig a simple resistor divider (if power is of o cocer), by usig a series resistor for miimum curret cosumptio, or by meas of a regulator. Outputs Pull up resistors will geerally be required to iterface with other logic families. These resistors must be coected betwee the various outputs ad the positive power supply. Oscillator Cosideratios The oscillator cosists of a CMOS iverter ad a feedback resistor whose value is depedet o the voltage at the oscillator iput ad output termials ad the V SUPPLY. Oscillator stabilities of approximately.ppm per.v variatio are achievable with a omial V SUPPLY of V ad a sigle voltage droppig resistor. The crystal specificatios are show i the Test Circuit. It is recommeded that the crystal load capacitace (CL) be o greater tha pf for a crystal havig a series resistace equal to or less tha 7Ω, otherwise the output amplitude of the oscillator may be too low to drive the divider reliably. It a very high quality oscillator is desired, it is recommeded that a quartz crystal be used havig a tight tuig tolerace ±ppm, a low series resistace (less tha Ω), a low motioal capacitace of mpf ad a load capacitace of pf. The fixed capacitor C IN should be pf ad the oscillator tuig capacitor should rage betwee approximately pf ad pf. Use of a high quality crystal will result i typical stabilities of.ppm per.v chage of V SUPPLY. Cotrol Iputs The TEST iput ihibits the 8 output ad applies the 9 output to the divider, thereby permittig a speedup of the testig of the sectio by a factor of 8 times. This also results i alterative output frequecies (see table). EXAMPLE: R f =.MHz 8V V V ( NOMINAL) I µa I ma R kω R R.8kΩ EXAMPLE: f OSC =.MHz 8V V V ( NOMINAL) I µa R = ( - ) - kω 8kΩ The iput may be used to chage the pulse width of from ms to s, or to chage the state of from All Itersil ON to OFF semicoductor durig. products are maufactured, assembled ad tested uder ISO9 quality systems certificatio. See Itersil Figures products are ad sold by descriptio for output oly. waveforms Itersil Corporatio ad reserves effect of the right to make chages i circuit desig ad/or specificatios at ay time without otice. Accordigly, the reader is cautioed to verify that data sheets are curret before placig orders. Iformatio furished by Itersil is believed to be accurate cotrol iputs. ad reliable. However, o resposibility is assumed by Itersil or its subsidiaries for its use; or for ay ifrigemets of patets or other rights of third parties which may result from its use. No licese is grated by implicatio or otherwise uder ay patet or patet rights of Itersil or its subsidiaries. I V S - FIGURE 9A. I R C BYPASS.µF V S + V S - FIGURE 9B. C BYPASS.µF ICM 7 I ICM 7 FIGURE 9. BIASING SCHEMES WITH HIGH VOLTAGE SUPPLIES For iformatio regardig Itersil Corporatio ad its products, see web site 9-

7 This datasheet has bee dowloaded from: Datasheets for electroic compoets.