ICM7213 TM NO T ODUC NT TE P R E C EM E L A O L S P E OB R D E MEND RECOM One Second/One Minute Timebase Generator December 2001 Features Description • Guaranteed 2V Operation The ICM7213 is a fully integrated micropower oscillator and frequency divider with four buffered outputs suitable for interfacing with most logic families. The power supply may be either a two battery stack (Ni-cad, alkaline, etc.) or a regular power supply greater than 2V. Depending upon the state of the WIDTH, INHIBIT, and TEST inputs, using a 4.194304MHz crystal will produce a variety of output frequencies including 2048Hz, 1024Hz, 34.133Hz, 16Hz, 1Hz, and 1/60Hz (plus composites). • Very Low Current Consumption (Typ) . . . . 100µA at 3V • All Outputs TTL Compatible • On Chip Oscillator Feedback Resistor • Oscillator Requires Only 3 External components: Fixed Capacitor, Trim Capacitor, and A Quartz Crystal • Output Inhibit Function The ICM7213 utilizes a very high speed low power metal gate CMOS technology which uses 6.4V zeners between the drains and sources of each transistor and also across the supply terminals. Consequently, the ICM7213 is limited to a 6V maximum VSUPPLY , although a simple dropping network can be used to extend the VSUPPLY range well above 6V (See Figure 9). • 4 Simultaneous Outputs: One Pulse/s, One Pulse/Min, 16Hz and Composite 1024 + 16 + 2Hz Outputs • Test Speed-Up Provides Other Frequency Outputs Part Number Information PART NUMBER ICM7213IPD TEMP. RANGE ( oC) -25 to 85 PACKAGE 14 Ld PDIP PKG. NO. E14.3 Pinout ICM7213 (PDIP) TOP VIEW WIDTH 1 14 OUT 4 OUT 3 2 13 OUT 2 INHIBIT 3 12 OUT 1 VSS 4 11 TEST OSC OUT 5 10 VDD OSC IN 6 9 N/ C N/ C 7 8 N/ C CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2001. All Rights Reserved 1 File Number 3165.2 ICM7213 Functional Block Diagram (4,194,304Hz) OSC IN (8192Hz) (1024Hz) (64Hz) (16Hz) (4Hz) OSCILLATOR ÷ 29 6 ÷ 23 ÷22 ÷ 24 ÷ 22 RF 5 OSC OUT (1/ 60Hz) n (1/2Hz) ÷ (1Hz) ³ (5 x 3 x 2) ÷2 (2Hz) ³ ÷2 ÷2 ³ n 14 n OUT 4 n 2 10 VDD OUT 3 n WIDTH 1 4 VSS n 3 11 13 12 INHIBIT OR RESET TEST OUT 2 OUT 1 2 ICM7213 Absolute Maximum Ratings Thermal Information Supply Voltage (V DD - VSS ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V Output Current (Any Output) . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA All Input and Oscillator Voltages. . . . . . . . VSS - 0.3V to VDD + 0.3V All Output Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSS to 6V Thermal Resistance (Typical, Note 1) θJA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Maximum Junction Temperature. . . . . . . . . . . . . . . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering, 10s) . . . . . . . . . . . . 300oC Operating Conditions Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -25oC to 85oC CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTE: 1. θJA is measured with the component mounted on an evaluation PC board in free air. VDD - VSS = 3.0V, fOSC = 4.194304MHz, Test Circuit, TA = 25oC, Unless Otherwise Specified Electrical Specifications PARAMETER TEST CONDITIONS Supply Current, IDD MIN TYP MAX UNIT - 100 140 µA 2 - 4 V Guaranteed Operating Supply Voltage Range (VDD - VSS), VSUPPLY -20oC to 85oC Output Leakage Current, IOLK Any output, VOUT = 6V - - 10 µA Output Sat. Resistance, ROUT Any output, IOLK = 2.5mA - 120 200 Ω Inhibit Input Current, II Inhibit terminal connected to VDD - 10 40 µA Test Point Input Current, ITP Test point terminal connected to VDD - 10 40 µA Width Input Current, IW Width terminal connected to VDD - 10 40 µA Oscillator Transconductance, gM VDD = 2V 100 - - µS 1 - 10 MHz - 1.0 - ppm - 0.1 - s - 0.2 - s Oscillator Frequency Range (Note 1), fOSC 2V < VDD < 4V Oscillator Stability, fSTAB Oscillator Start Time, tS VDD = 2V NOTE: 1. The ICM7213 uses dynamic dividers for high frequency division. As with any dynamic system, information is stored on very small nodal capacitances instead of latches (static system), therefore there is a lower frequency of operation. Dynamic dividers are used to improve the high frequency performance while at the same time significantly decreasing power consumption. At low V SUPPLY , operation at less than 1MHz is possible. Output Definitions (NOTE 1) INPUT STATES TEST INHIBIT WIDTH PIN 12 OUT 1 PIN 13 OUT 2 PIN 2 OUT 3 L L L 16Hz ÷ 218 1024 + 16 + 2Hz (÷ 212 ÷ 218 ÷ 221) Composite 1Hz, 7.8ms ÷ 222 L L H 16Hz ÷ 218 1024 + 16 + 2Hz (÷ 212 ÷ 218 ÷ 221) Composite 1Hz, 7.8ms ÷ 222 1/ OFF OFF 60Hz, 125ms H L L ON H L H ON 4096 + 1024Hz (÷ 210 ÷ 212) Composite 2048Hz ÷ 211 34.133Hz, 50% DC ÷ (213 x 5 x 3) H H L ON 1024Hz ÷ 212 ON OFF 212 ON OFF L H H H H L H H 16Hz ÷ ON 218 218 1024 + 16Hz (÷ 1/60Hz, 1s ÷ (224 x 3 x 5) ÷ 1024 + 16Hz (÷ ÷ 218) Composite 4096 + 1024Hz (÷ 210 ÷ 212) Composite L 16Hz ÷ PIN 14 OUT 4 212 218) Composite 212 1024Hz ÷ OFF 211 34.133Hz, 50% DC ÷ (213 x 5 x 3) 2048Hz ÷ See Waveforms NOTE: 1. When TEST and RESET are connected to ground, or left open, all outputs except for OUT 3 and OUT 4 have a 50% duty cycle. 3 ICM7213 Timing Waveforms 1024Hz 16Hz OUT 2 2Hz FIGURE 1. OUTPUT WAVEFORM INHIBIT OUT 3 <7.8ms CASE 1 0.75s to 1.0s OUT4 CASE 2 (PULSE 3 COINCIDENT WITH INHIBIT) 59.75s to 60s <7.8ms OUT 3 <125ms <7.8ms OUT 4 OUT 3 CASE 3 (EFFECT OF WIDTH ON OUT 4) OUT 4 tICS WIDTH OUT 3 CASE 4 (EFFECT OF WIDTH ON OUT 4) OUT 4 1s WIDTH FIGURE 2. EFFECT OF THE INHIBIT (TEST CONNECTED TO VSS OR LEFT OPEN) Typical Performance Curves 300 130 TA = 25 oC VSUPPLY = 3V SUPPLY CURRENT (µA) 120 SUPPLY CURRENT, IDD (µA) CIN = COUT = 30pF FOSC = 4.19MHz 110 100 90 80 250 fOSC = 4.194304 MHz 200 150 C IN = COUT = 30pF 100 50 CIN = C OUT = 10pF 70 -40 -20 0 20 40 TEMPERATURE (oC) 60 0 2.0 80 3.0 4.0 5.0 SUPPLY VOLTAGE VDD - VSS (V) FIGURE 3. SUPPLY CURRENT AS A FUNCTION OF TEMPERATURE FIGURE 4. SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE 4 ICM7213 Typical Performance Curves (Continued) 30 +1.5 OSCILLATOR FREQUENCY DEVIATION, ∆f/f IN ppm TA = 25 oC OUTPUT CURRENT - mA 25 VSUPPLY = 5V 20 15 VSUPPLY = 3V 10 VSUPPLY = 2V 5 0 0 0.1 0.2 0.3 0.4 0.5 VDD - VSS = 3V +1.0 MAINTAINED AT 25 oC fOSC = 4.19MHz +0.5 0.0 -0.5 -1.0 -1.5 -40 0.6 CIN , COUT AND QUARTZ CRYSTAL -20 +3 40 60 80 6 TA = 25 oC fOSC = 4.194304MHz 5 +1 4 VOLTAGE SUPPLY OSCILLATOR FREQUENCY DEVIATION, ∆f/f IN ppm 20 FIGURE 6. OSCILLATOR STABILITY AS A FUNCTION OF DEVICE TEMPERATURE FIGURE 5. OUTPUT CURRENT AS A FUNCTION OF OUTPUT +2 0 TEMPERATURE (oC) OUTPUT SATURATION VOLTAGE (ANY OUTPUT) (V) 0 -1 CIN = COUT = 30pF 3 OPERATING WINDOW 2 CIN = C OUT = 10pF -2 1 -3 3.0 2.0 4.0 5.0 0 SUPPLY VOLTAGE VDD - VSS (V) 10kHz FIGURE 7. OSCILLATOR STABILITY AS A FUNCTION OF SUPPLY VOLTAGE 100kHz 1MHz FIGURE 8. WINDOW OF CORRECT OPERATION Test Circuit WIDTH INHIBIT N.O. N.O. 1 14 2 13 3 12 4 ICM7213 CRYSTAL PARAMETER f = 4.194304MHz RS = 35Ω (PARALLEL RESONANT) CM = 17mpF CO = 2.5pF N.O. 11 5 10 6 9 7 8 + IDD 30pF T.P. VSUPPLY - 30pF 5 10MHz ICM7213 Detailed Description Control Inputs The TEST input inhibits the 218 output and applies the 29 output to the 221 divider, thereby permitting a speedup of the testing of the ÷ 60 section by a factor of 2048 times. This also results in alternative output frequencies (see table). Supply Voltage Considerations The ICM7213 may be used to provide various precision outputs with frequencies from 2048Hz to 1/60Hz using a 4.194304MHz quartz oscillator, and other output frequencies may be obtained using other quartz crystal frequencies. Since the ICM7213 uses dynamic high frequency dividers for the initial frequency division there are limitations on the VSUPPLY range depending on the oscillator frequency. If, for example, a low frequency quartz crystal is selected, the VSUPPLY should be selected in the center of the operating window, or approximately 1.7V. The WIDTH input may be used to change the pulse width of OUT 4 from 125ms to 1s, or to change the state of OUT 4 from ON to OFF during INHIBIT. See Figures 1 and 2 for output waveforms and effect of control inputs. VS + The V SUPPLY to the ICM7213 may be derived from a high voltage supply by using a simple resistor divider (if power is of no concern), by using a series resistor for minimum current consumption, or by means of a regulator. EXAMPLE: R1 f = 4.2MHz 8V ≤ V ≤ 12V (10 NOMINAL) I1 ≈ 100µA I2 ≈ 1mA R2 ≈ 3kΩ R2 R1 ≈ 6.8kΩ Outputs Pull up resistors will generally be required to interface with other logic families. These resistors must be connected between the various outputs and the positive power supply. CBYPASS 0.01µF I1 VDD ICM 7213 I2 VSS Oscillator Considerations VS - The oscillator consists of a CMOS inverter and a feedback resistor whose value is dependent on the voltage at the oscillator input and output terminals and the V SUPPLY . Oscillator stabilities of approximately 0.1ppm per 0.1V variation are achievable with a nominal V SUPPLY of 5V and a single voltage dropping resistor. The crystal specifications are shown in the Test Circuit. FIGURE 9A. EXAMPLE: VS + fOSC = 4.2MHz 8V ≤ V ≤ 12V (10 NOMINAL) R3 I1 ≈ 100µA R3 = (10 - 3) I1 10 - 4 kΩ ≈ 68kΩ It is recommended that the crystal load capacitance (CL) be no greater than 22pF for a crystal having a series resistance equal to or less than 75Ω, otherwise the output amplitude of the oscillator may be too low to drive the divider reliably. CBYPASS 0.01µF It a very high quality oscillator is desired, it is recommended that a quartz crystal be used having a tight tuning tolerance ±10ppm, a low series resistance (less than 25Ω), a low motional capacitance of 5mpF and a load capacitance of 20pF. The fixed capacitor CIN should be 30pF and the oscillator tuning capacitor should range between approximately 16pF and 60pF. VDD ICM 7213 VSS VS - FIGURE 9B. Use of a high quality crystal will result in typical stabilities of 0.05ppm per 0.1V change of VSUPPLY . FIGURE 9. BIASING SCHEMES WITH HIGH VOLTAGE SUPPLIES All Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements 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 Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com Sales Office Headquarters NORTH AMERICA Intersil Corporation 7585 Irvine Center Drive Suite 100 Irvine, CA 92618 TEL: (949) 341-7000 FAX: (949) 341-7123 Intersil Corporation 2401 Palm Bay Rd. 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