ICL7665AESA Maxim Integrated Products, ICL7665AESA Datasheet - Page 6

• Manufacturer Part Number: ICL7665AESA
• Description: Supervisory Circuits Integrated Circuits (ICs)
• Manufacturer: Maxim Integrated Products

Specifications of ICL7665AESA

• Number Of Voltages Monitored: 2
• Undervoltage Threshold: 1.275 V, 1.225 V
• Overvoltage Threshold: 1.325 V, 1.375 V
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Supply Voltage (max): 16 V
• Supply Voltage (min): 2 V
• Supply Current (typ): 15 uA
• Maximum Power Dissipation: 471 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: No

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 A maxi-
mum, 3 A 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 V
Microprocessor Voltage Monitor with
Dual Over/Undervoltage Detection
Figure 1. Test Circuit
Table 1. ICL7665 Truth Table
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.
* See Electrical Characteristics
6
_______________Detailed Description
V
V
V
V
SET1
SET1
SET2
SET2
_______________________________________________________________________________________
INPUT*
> 1.3V
< 1.3V
> 1.3V
< 1.3V
1.6V
1.0V
OUT1 = ON = LOW
OUT1 = OFF = HI
OUT2 = OFF = HI
OUT2 = ON = LOW
INPUT
OUTPUT
OL
of 0.4V.
3
4
1
2
OUT1
HYST1
SET1
GND
HYST1 = ON = HI
HYST1 = OFF = LOW
HYST2 = ON = HI
HYST2 = OFF = LOW
HYSTERESIS
ICL7665
HSYT2
OUT2
SET2
V+
8
5
7
6
V+
20k
In spite of the very low operating current, the ICL7665
has a typical propagation delay of only 75 s. 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.
Figure 2. Block Diagram
SET1
SET2
4.7k
20k
4.7k
12pF
12pF
REFERENCE
BANDGAP
1.3V
12pF
12pF
HSYT2
OUT1
OUT2
HYST1
TO V+
V+
HYST1
OUT1
HYST2
OUT2