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Features

Y Input frequency: 130 MHz (-4); 225 MHz (-2) Y Low power: 10 mA (-4, -2) Y Input sensitivity: 100 mVrms (-4); 40 mVrms (-2) Y Pin compatible with Motorola MC12015-16 prescalers Y Unregulated/regulated power supply option Logic and Connection Diagrams Generalized d N/N a1 TL/F/5240 1 Dual-In-Line Package TL/F/5240 2 Top View Order Number DS8615N or DS8616N (-4, -2) See NS Package Number N08E C1995 National Semiconductor Corporation RRD B30M105/Printed in U S A

Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. V S, Unregulated Supply Voltage 15V VREG, Regulated Supply Voltage 7V Modulus Control Input Voltage 7V Open-Collector Output Voltage 7V Operating Free Air Temperature Range b30§Ct o a70§C Storage Temperature Range b65§Ct o a150§C Recommended Operating Conditions Symbol Parameter Conditions DS8615-4 DS8615-2 DS8616-4 DS8616-2 Units Min Max Min Max VS Unregulated Supply Voltage V REG Open 6.8 13.5 5.5 13.5 V VREG Regulated Supply Voltage V S and V REG Shorted 4.5 5.5 4.5 5.5 V fMAX Toggle Frequency VIN 100 mVrms 20 130 225 MHz VIN Input Signal Amplitude 100 300 40 300 mVrms VSLW Slew Rate 20 20 V/ms IOH High Level Output Current b400 b400 mA IOL Low Level Output Current 2.0 2.0 mA DS8615-4 DS8615-2 Symbol Parameter Conditions DS8616-4 DS8616-2 Units Min Max Min Max VIH High Level MC Input V S 13.5V, V REG Open 2.0 2.0 VVoltage VIL Low Level MC Input V REG VS 4.5V 0.8 0.8 VVoltage VOH High Level Output I OH b0.4 mA, VREG b2V REG b2VVoltage Pins 2 and 3 Shorted ICEX Open-Collector High Lower Output 5.5V 100 100 mALevel Output VOL Low Level Output V REG 4.5V, I OL 2m A 0.5 0.5 VVoltage II Max MC Input Current V S 13.5V, V REG Open, 100 100 mAVIH 7V IIH High Level MC Input V REG 4.5V, V IH 2.7V 20 20 mACurrent IIL Low Level MC Input V S 13.5V, V REG Open, b200 b200 mACurrent V IL 0.4V IS Supply Current, V S 13.5V, V REG Open 10 10 mAUnregulated Mode IREG Supply Current, V S VREG 5.5V 10 10 mARegulated Mode Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device operation. Note 2: Unless otherwise specified Min/Max limits apply across the 30§Ct o a70§C range. Note 3: All current into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown as Max or Min on absolute value basis.

Symbol Parameter Conditions Min Max Units tMODULUS Modulus Set-Up Time DS8615, DS8616 65 ns(Notes 4 and 5) RIN AC Input Resistance VIN 100 MHz and 50 mVrms 1.0 kX CIN Input Capacitance VIN 100 MHz and 50 mVrms 3 10 pF Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. Except for ‘‘Operating Temperature Range’’ they are not meant to imply that the devices should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device operation. Note 2: Unless otherwise specified min/max limits apply across the 30§Ct o a70§C temperature range. Note 3: All currents into device pins are shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown as max or min on absolute value basis. Note 4: t MODULUS the period of time the modulus control level must be defined prior to the positive transition of the prescaler output to ensure proper modulus selection. Note 5: See Timing Diagrams. Timing Diagram TL/F/5240 3 The logical state of the modulus control input just prior to the output’s rising edge will determine the modulus ratio of the device immediately following that rising edge. The pulse width difference of N and N a 1 operation occurs during the output HI conditions. Typical Applications TL/F/5240 4 TL/F/5240 5 Schematic Diagrams TL/F/5240 6 TL/F/5240 7 TL/F/5240 8

The signal source is usually capacitively coupled to the in- put. At higher frequencies a 0.001 mF input capacitor (C1) is usually sufficient, with larger values used at the lower fre- quencies. If the input signal is likely to be interrupted, it may be desirable to connect a 100 k X resistor between one in- put and ground to stabilize the device. In the single-ended mode, it is preferable to connect the resistor to the unused input. In the differential mode, the resistor can be connected to either input. The addition of the 100 k X pulldown resistor causes a loss of input sensitivity, but prevents circuit oscilla- tions under no signal (open circuit) conditions. In addition, in the single ended mode, a capacitor of 0.001 mF (C2) should be connected between the unused input and the ground plane to provide a good high frequency bypass. The capaci- tor should be made larger for lower frequencies. The input waveform may be sinusoidal, but below about

20 MHz the operation of the circuit becomes dependent on

the slew rate of the input rather than amplitude. A square wave input with a slew rate of greater than 20 V/ ms will permit correct operation down to lower frequencies, provid- ed the proper input coupling capacitor is provided. For regulated mode operation connect V S to V REG to en- sure proper operation (see Typical Application diagram).

Physical Dimensions inches (millimeters) Molded Dual-In-Line Package (M) Order Number DS8614M-4, DS8615M-4, DS8616M-4 or DS8617M-4

DS8615/DS8616 130/225 MHz Low Power Dual Modulus Prescalers Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number DS8614N, DS8615N, DS8616N or DS8617N (-4, -3, -2) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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