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DS 3294- 1
SP8792 225MHz / 80/81 SP8793 225MHz / 40/41
WITH ON-CHIP VOLTAGE REGULATOR
The SP8792 AND SP8793 are low power programmable /80/81 and /40/41 counter, temperature range: -40C to +85C.They divide by 80(40) when control input is in the high state and by 81(41) when in the low state. An internal voltage regulator allows operation from a wide range of supply voltages.
MODULUS CONTROL INPUT OUTPUT Vcc 2 OUTPUT 0V)
1 2 3 4
8 7 6 5
Vcc 1 Vcc 2 INTERNAL DECOUPLING INPUT
FEATURES
Very Low Power Control Input and Output CMOS/TTL Compatible AC Coupled Input Operation up to 9.5V using Internal Regulator DP8 MP8
Figure 1 Pin connections - top view
ABSOLUTE MAXIMUM RATINGS QUICK REFERENCE DATA
Supply Voltage 5.2V or 6.8V to 9.5V Power consumption: 26mW Typical Supply voltage Supply voltage Storage temperature range Max. Junction temperature Max. clock input voltage Vcc2 max. 6.0V pins 7 & 8 tied 13.5V pin 8, pin 7 decoupled -55C to +125C +175C 2.5V p-p 10V
VCC1 VCC2 2 100n 8
1n CLOCK INPUT
5
DIVIDE BY 80/81
(SP8792)
VOLTAGE REGULATOR
6
DECOUPLING
DIVIDE BY 40/41
(SP8793)
1n 16k
4 VEE (0V)
1 CONTROL INPUT
3 OUTPUT
7 100n
Figure 2 : Functional diagram SP8799
SP8793
ELECTRICAL CHARACTERISTICS
Test conditions (unless otherwise stated):] Supply voltage : Vcc = 5.2 0.25V or 6.8V to 9.5V (see Operating Note 6): VEE = 0V Temperature Tamb = -40C to +85C Value 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 IEE VINH VINL VOH VOL ts tr tp 14 20 45 2.4 0.5 4 2 7 mA V V V V ns ns ns Note 4 Note 4 Note 4 Note 4 Note 4 Note 3 Note 3 Note 3 Pins 2, 7 and 8 linked Vcc = 4.95V IOH = 100A Pin 2 linked to 8 and 7 IOL = 1.6mA 25C 25C 25C fmin 20 MHz Note 4 Input = 400-800mV p-p Symbol fmax Min. 225 Max. MHz Units Notes Note 4 Conditions Input = 200-800mV p-p
NOTES 1. Unless otherwise stated the electrical characteristics are guaranteed over full specified supply, frequency and temperature range. 2. The test configuration for dynamic testing is shown in Fig.6. 3. Guaranteed but not tested. 4. Tested onlt at 25C
TRUTH TABLE FOR CONTROL INPUTS
Control inputs 0 1 Division Ratio SP8792 81 80 SP8793 41 40
Figure 3 : Timing diagramSP8792/3 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 / 80 or 40 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 / 81 or 41 mode is selected.
1800 1600
INPUT AMPLITUDE (mV p-p)
1400 1200 1000 800 600 400 200 0 50 100 200 INPUT FREQUENCY (MHz) 300
*Tested as specified in table of Electrical Characteristics
GUARANTEED * OPERATING WINDOW
Figure 4 : Input sensitivity SP8792/SP8793
SP8793
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 25C, frequencies in MHz, impedance normalised to 50 ohms.
VCC OF MODULUS CONTROL DEVICE
CONTROL INPUT
1 2
8 7 6 1n 5
VCC1 VCC2
SEE OPERATING NOTE 6 50 MONITOR 50 SIGNAL SOURCE
OUTPUT
3 4
1n
100n
Figure 6 : Toggle frequency test circuit
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