MAX791CUE Maxim Integrated, MAX791CUE Datasheet - Page 8
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MAX791CUE
Manufacturer Part Number
MAX791CUE
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX791r
Datasheet
1.MAX791ESE-T.pdf
(19 pages)
Specifications of MAX791CUE
Number Of Voltages Monitored
1
Monitored Voltage
4.65 V
Undervoltage Threshold
4.5 V
Overvoltage Threshold
4.75 V
Output Type
Active Low, Open Drain, Push-Pull
Manual Reset
Resettable
Watchdog
Watchdog
Battery Backup Switching
Backup
Power-up Reset Delay (typ)
280 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Package / Case
TSSOP-16
Chip Enable Signals
Yes
Maximum Power Dissipation
533 mW
Minimum Operating Temperature
0 C
Power Fail Detection
Yes
Supply Current (typ)
150 uA
Supply Voltage - Min
0 V
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MAX791CUE
Manufacturer:
TEMIC
Quantity:
162 654
Microprocessor Supervisory Circuit
Figure 1. MAX791 Block Diagram
Many µP-based products require manual-reset capabil-
ity, allowing the operator or test technician to initiate a
reset. The Manual Reset Input (MR) can be connected
directly to a switch, without an external pull-up resistor
or debouncing network. It connects to a 1.25V com-
parator, and has a pull-up to V
1. The propagation delay from asserting MR to RESET
asserted is 4µs typ. Pulsing MR low for a minimum of
15µs resets all the internal counters, sets the Watchdog
Output (WDO) and Watchdog-Pulse Output (WDPO)
8
SWT
V
WDI
_______________Detailed Description
MR
PFI
CC
VBATT
CE IN
_______________________________________________________________________________________
13
11
3
1
9
8
7
V
OUT
4.65V
1.25V
4
150mV
TIMEBASE FOR
CHIP-ENABLE
GENERATION
GND
WATCHDOG
WATCHDOG
TRANSITION
RESET AND
CONTROL
DETECTOR
OUTPUT
RESET
Manual Reset Input
OUT
MAX791
as shown in Figure
WATCHDOG
TIMER
10
LOWLINE
BATT ON
12
15
16
14
5
2
6
CE OUT
V
RESET
WDPO
WDO
PFO
OUT
high, and sets the Set Watchdog-Timeout (SWT) input
to V
(for internal timeouts). It also disables the chip-enable
function, setting the Chip-Enable Output (CE OUT) to a
high state. The RESET output remains active as long as
MR is held low, and the reset-timeout period begins
after MR returns high (Figure 2).
Use this input as either a digital-logic input or a second
low-line comparator. Normal TTL/CMOS levels can be
wire-OR connected via pull-down diodes (Figure 3),
and open-drain/collector outputs can be wire-ORed
directly.
Figure 2. Manual-Reset Timing Diagram
Figure 3. Diode "OR" Connections Allow Multiple Reset Sources
to Connect to MR
SOURCES
OUT
OTHER
CE OUT
RESET
RESET
CE IN
* DIODES NOT REQUIRED ON OPEN-DRAIN OUTPUTS
MR
0V
MANUAL RESET
- 0.6V, if it is not already connected to V
*
*
MR
25µs MIN
MAX791
7.5µs TYP
15µs TYP
OUT