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ICL7665IPA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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ICL7665IPA Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page _______________Detailed Description As shown in the block diagram of Figure 2, the Maxim ICL7665 combines a 1.3V reference with two com- parators, two open-drain N-channel outputs, and two open-drain P-channel hysteresis outputs. The refer- ence and comparator are very low-power linear CMOS circuits, with a total operating current of 10 µA maxi- mum, 3 µA typical. The N-channel outputs can sink greater than 10mA, but are unable to source any cur- rent. These outputs are suitable for wire-OR connections and are capable of driving TTL inputs when an external pull-up resistor is added. The ICL7665 Truth Table is shown in Table 1. OUT1 is an inverting output; all other outputs are noninverting. HYST1 and HYST2 are P-channel current sources whose sources are connected to V+. OUT1 and OUT2 are N-channel current sinks with their sources connect- ed to ground. Both OUT1 and OUT2 can drive at least one TTL load with a VOL of 0.4V. In spite of the very low operating current, the ICL7665 has a typical propagation delay of only 75 µs. Since the comparator input bias current and the output leakages are very low, high-impedance external resistors can be used. This design feature minimizes both the total sup- ply current used and loading on the voltage source that is being monitored. Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection 6 _______________________________________________________________________________________ Figure 1. Test Circuit HYST2 = OFF = LOW OUT2 = ON = LOW VSET2 < 1.3V HYST2 = ON = HI OUT2 = OFF = HI VSET2 > 1.3V HYST1 = OFF = LOW OUT1 = OFF = HI VSET1 < 1.3V HYST1 = ON = HI OUT1 = ON = LOW VSET1 > 1.3V HYSTERESIS OUTPUT INPUT* Table 1. ICL7665 Truth Table V+ HYST1 HYST2 OUT1 OUT2 TO V+ SET2 SET1 1.3V BANDGAP REFERENCE Figure 2. Block Diagram 1 2 3 4 8 7 6 5 ICL7665 OUT1 HYST1 SET1 GND V+ OUT2 SET2 HSYT2 12pF 12pF 12pF 12pF OUT1 HYST1 OUT2 HSYT2 4.7k 4.7k V+ 1.6V 1.0V INPUT 20k 20k * See Electrical Characteristics OUT1 is an inverting output; all others are noninverting. OUT1 and OUT2 are open-drain, N-channel current sinks. HYST1 and HYST2 are open-drain, P-channel current sinks. |
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