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features very low power control input and output cmos/ttl compatible ac coupled input operation up to 9.5v using internal regulator quick reference data supply voltage 5.2v or 6.8v to 9.5v power consumption: 26mw typical temperature range: -40 c to +85 c SP8799 225mhz ? 10/11 two modulus divider the SP8799 is a low power programmable ? 10/11 counter. lt divides by 10, when the control input is in the high state and by 11 when in the low state. an internal voltage regulator allows operation from a wide range of supply voltages. figure 1 pin connections - top view dp8, mp8 absolute maximum ratings supply voltage 6.0v pins 7 & 8 tied supply voltage 13.5v pin 8, pin 7 decoupled storage temperature range -55 c to +125 c max. junction temperature +175 c max. clock input voltage 2.5v p-p vcc2 max. 10v ds 3296- 1 figure 2 : functional diagram SP8799 control input 1 vcc 1 8 output vcc 2 2 ref decoupling 7 output 3 internal bias decoupling 6 v ee (0v) 4 input 5 SP8799 clock input internal bias decoupling v ee (0v) control input output ref decoupling v cc 1 100n v cc 2 1n 1n 16k 5 6 4 137 8 2 divide by 10/11 voltage regulator
SP8799 notes the set-up time ts is defined as the minimum time that can elapse between a l ? h transition of the control input and the next l ? h clock pulse transition to ensure that the ? 10 mode is selected. the release time tr is defined as the minimum time that can elapse between a h ? l transition of the control input and the next l ? h clock pulse transition to ensure that the ? 11 mode is selected. electrical characteristics test conditions (unless otherwise stated):] supply voltage : vcc 1 & 2 = 5.2 0.25v or 6.8v to 9.5v (see operating note 7): v ee = 0v; temperature t amb = -40 c to +85 c conditions input = 200-800mv p-p input = 400-800mv p-p pins 2, 7 and 8 linked vcc = 4.95v i oh = 100 m a pin 2 linked to 8 and 7 i ol = 1.6ma 25 c 25 c 25 c characteristics maximum frequency (sinewave input)) minimum frequency (sinewave input) power supply current control input high voltage control input low voltage output high voltage output low voltage set up time release time clock to output propagation time notes note 4 note 4 note 4 note 4 note 4 note 4 note 4 note 3 note 3 note 3 units mhz mhz ma v v v v ns ns ns min. 225 4 2.4 14 20 max. 20 7 2 0.5 45 value symbol f max f min i ee v inh v inl v oh v ol t s t r t p figure 3 : timing diagramSP8799 figure 4 : input sensitivity SP8799 *tested as specified in table of electrical characteristics control input 0 1 division ratio 11 10 notes 1. unless otherwise stated the electrical characteristics are guaranteed over full specified supply, frequency and temperature r ange. 2. the test configuration for dynamic testing is shown in fig.6. 3. guaranteed but not tested. 4. tested onlt at 25 c truth table for control inputs 1600 1400 1200 1000 800 600 400 200 0 50 100 200 300 input frequency ( mhz ) input amplitude (mv p-p) vcc 4.95v to 5.45v pins 7 and 8 connected together. tamb -40? to +85? guaranteed * operating window
SP8799 operating notes 1. the clock input (pin 5) should be capacitively coupled to the signal source. the input signal path is completed by coupling a capacitor from the internal bias decoupling, pin 6 to ground. 2. the output stage which is normally open collector (pin 2 open circuit) can be interfaced to cmos. the open collector can be returned to a +10v line via a 5k resistor but the output sink current should not exceed 2ma. if interfacing to ttl is required then pins 2 and 7 should be connected together to give a fan-out = 1. this will increase supply current by approximately 2ma. 3. the circuit will operate down to dc but a slew rate of better than 20v/~s is required. 4. the mark space ratio of the output is approximately 1.2:1 at 200mhz. 5. input impedance is a function of frequency. see fig.5. 6. if no signal is present the device will self-oscillate. if this is undesirable it may be prevented by connecting a 150k between unused input and ground. this reduces the input sensitivity by typically 50-100mv p-p. 7. the internal regulator has its input connected to pin 8, while the internal reference voltage appears at pin 7 and should be decoupled. for use from a 5.2v supply, pins 7 and 8 should be connected together, and 5.2v applied to these pins. for operation from supply voltages in the range +6.8v to +9.5v, pins 7 and 8 should be separately decoupled, and the supply voltage applied to pin 8. figure 5 : typical impedance. test conditions: supply voltage 5.2v, ambient temperature 25 c, frequencies in mhz, impedance normalised to 50 ohms. figure 6 : toggle frequency test circuit 18 27 36 45 SP8799 v cc 1 control input output vcc of modulus control device 1n 100n 1n 50 monitor 50 signal source
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