MAX16056 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – 125nA Supervisory Circuits with Capacitor- Adjustable Reset and Watchdog Timeouts

MAX16056–MAX16059
125nA Supervisory Circuits with Capacitor-
Adjustable Reset and Watchdog Timeouts
General Description
The MAX16056–MAX16059 are ultra-low-current 125nA
(typ) microprocessor (µP) supervisory circuits that mon-
itor a single system supply voltage. These devices
assert an active-low reset signal whenever the V_CC
supply voltage drops below the factory-trimmed reset
threshold, manual reset is pulled low, or the watchdog
timer runs out (MAX16056/MAX16058). The reset output
remains asserted for an adjustable reset timeout period
after V_CC rises above the reset threshold. Factory-
trimmed reset threshold voltages are offered from
1.575V to 4.625V in approximately 100mV increments
(see Table 1).
These devices feature adjustable reset and watchdog
timeout using external capacitors. The MAX16056/
MAX16058 contain a watchdog timer with a watchdog
select input (WDS) that multiplies the watchdog timeout
period by 128. The MAX16057/MAX16059 do not have
the watchdog feature.
The MAX16056–MAX16059 are available in either push-
pull or open-drain output-type configurations (see the
Ordering Information). These devices are fully specified
over the -40°C to +125°C automotive temperature range.
The MAX16056/MAX16058 are available in the 8-pin
TDFN package, and the MAX16057/MAX16059 are avail-
able in the 6-pin TDFN package.
Applications
Portable/Battery-Powered Equipment
PDAs/Cell Phones
MP3 Players/Pagers
Glucose Monitors/Patient Monitors
Metering/HVAC
Typical Operating Circuit appears at end of data sheet.
TOP VIEW
V_CC WDS WDI SRT
8765
Features
o Ultra-Low 125nA (typ) Supply Current
o 1.1V to 5.5V Operating Supply Range
o Factory-Set Reset Threshold Options from 1.575V
to 4.625V in Approximately 100mV Increments
o Capacitor-Adjustable Reset Timeout
o Capacitor-Adjustable Watchdog Timeout
(MAX16056/MAX16058)
o Watchdog Timer Capacitor Open Detect Function
o Optional Watchdog Disable Function
(MAX16056/MAX16058)
o Manual Reset Input
o Guaranteed RESET Valid for V_CC ≥ 1.1V
o Push-Pull or Open-Drain RESET Output Options
o Power-Supply Transient Immunity
o Small, 3mm x 3mm TDFN Package
Ordering Information
PART
PIN-
PACKAGE
RESET
OUTPUT
WATCH-
DOG
TIMER
MAX16056ATA_ _+T 8 TDFN-EP* Push-Pull
Yes
MAX16057ATT_ _+T 6 TDFN-EP* Push-Pull
No
MAX16058ATA_ _+T 8 TDFN-EP* Open-Drain Yes
MAX16059ATT_ _+T 6 TDFN-EP* Open-Drain No
Note: All devices are specified over the -40°C to +125°C oper-
ating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
“_ _” represents the two number suffix needed when ordering
the reset threshold voltage value (see Table 1).
Standard versions and their package top marks are shown in
Table 3 at the end of data sheet.
Pin Configurations
V_CC N.C. SRT
6
5
4
MAX16056
MAX16058
EP
1 234
RESET GND SWT MR
TDFN
*CONNECT EXPOSED PAD TO GND.
MAX16057
MAX16059
EP
1
2
3
RESET GND MR
TDFN
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4686; Rev 2; 4/13