CAT1832Z ON Semiconductor, CAT1832Z Datasheet - Page 5

• Manufacturer Part Number: CAT1832Z
• Description: Supervisory Circuits 3.3 V
• Manufacturer: ON Semiconductor

Specifications of CAT1832Z

• Number Of Voltages Monitored: 1
• Monitored Voltage: 3.3 V, 5 V
• Undervoltage Threshold: 2.8 V, 2.47 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Resettable
• Watchdog: Watchdog
• Battery Backup Switching: No Backup
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1 V
• Supply Current (typ): 35 uA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: MSOP-8
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

V
APPLICATION INFORMATION
SUPPLY VOLTAGE MONITOR
Reset Signal Polarity and Output Stage Structure
¯¯¯¯¯¯ is an active LOW signal. It is developed with
RESET
an open drain driver in the CAT1232LP. A pull-up
resistor is required, typical values are 10 kΩ to 50 kΩ.
The CAT1832 uses a CMOS push-pull output stage
for the RESET
RESET is an active High signal developed by a
CMOS push-pull output stage and is the logical
opposite to RESET
Trip Point Tolerance Selection
The TOL input is used to select the V
threshold. This selection is made connecting the
TOL input to ground or V
Ground makes the V
CAT1232LP and 2.88 V for the CAT1832.
Connecting TOL to V
4.37 V for the CAT1232LP and 2.55 V for the
CAT1832.
After V
RESET and RESET
period of 250 ms.
On power-down, once V
threshold the RESET outputs will remain active and
are guaranteed valid down to a V
Figure 1. Timing Diagram: Power Up
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CC
¯¯¯¯¯¯ .
CC
V
CCTP(MIN)
has risen above the trip point set by TOL,
¯¯¯¯¯¯ .
¯¯¯¯¯¯ remain active for a minimum time
V
CC
CC
CCTP
V
CCTP(MAX)
makes the V
t
trip threshold 4.62 V for the
R
t
CC
RPU
CC
falls below the reset
. Connecting TOL to
CC
level of 1.0 V.
CC
V
V
OH
OL
trip threshold
CC
RESET
RESET
trip point
5
Manual Reset Operation
Push-button input, PBRST
reset signals. The pushbutton input is debounced and
is pulled high through an internal 40 kΩ resistor.
When PBRST
20 ms, both resets become active and remain active
for a minimum time period of 250 ms after PBRST
returns high.
No external pull-up resistor is required, since PBRST
is pulled high by an internal 40 kΩ resistor.
¯¯¯¯¯¯ can be driven from a TTL or CMOS logic line
PBRST
or short-ed to ground with a mechanical switch.
Figure 2. Timing Diagram: Power Down
CAT1232LP
CAT1232LP
TOL = GND
TOL = GND
RESET
RESET
Tolerance
TOL = V
TOL = V
CAT1832
CAT1832
Voltage
Select
V
CC
¯¯¯¯¯¯ is held low for the minimum time of
V
CC
CC
CCTP(MAX)
V
Tolerance
Trip Point
CCTP
10 %
20 %
10 %
5 %
¯¯¯¯¯¯ , allows the user to issue
V
V
OH
OL
V
CCTP(MIN)
t
F
CAT1232LP, CAT1832
t
4.25
4.50
2.47
2.80
RPD
Min
Trip Point Voltage (V)
Nominal
Doc. No. MD-3018 Rev. F
4.37
4.62
2.55
2.88
¯¯¯¯¯¯
Max
4.49
4.74
2.64
2.97