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PDF MAX16016 Data sheet ( Hoja de datos )

Número de pieza MAX16016
Descripción (MAX160xx) Low-Power uP Supervisory Circuits
Fabricantes Maxim Integrated Products 
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1. MAX16016






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19-4145; Rev 2; 10/08
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Low-Power µP Supervisory Circuits with
Battery-Backup Circuit and Chip-Enable Gating
General Description
The MAX16016/MAX16020/MAX16021 supervisory cir-
cuits monitor power supplies, provide battery-backup
control, and chip-enable (CE) gating to write protect
memory in microprocessor (µP)-based systems. These
low-power devices improve system reliability by providing
several supervisory functions in a small, single integrated
solution.
The MAX16016/MAX16020/MAX16021 perform four
basic system functions:
1) Provide a µP reset output during VCC supply power-
up, power-down, and brownout conditions.
2) Control VCC to battery-backup switching internally
to maintain data or low-power operation for memo-
ries, real-time clocks (RTCs), and other digital logic
when the main power is removed.
3) Provide memory write protection through internal
chip-enable gating during brownout.
4) Provide a combination of additional supervisory
functions listed in the Features section.
The MAX16016/MAX16020/MAX16021 operate from a
1.53V to 5.5V supply voltage and offer fixed reset
thresholds for monitoring 5V, 3.3V, 3V, 2.5V, and 1.8V
systems. Each device is available with either a push-
pull or open-drain reset output.
The MAX16016/MAX16020/MAX16021 are available in
small TDFN/TQFN packages and are fully specified for
an operating temperature range of -40°C to +85°C.
Applications
Main/Backup Power for RTCs, CMOS Memories
Industrial Control
GPS Systems
Set-Top Boxes
Point-of-Sale Equipment
Portable/Battery Equipment
Features
o System Monitoring for 5V, 3.3V, 3V, 2.5V, or 1.8V
Power-Supply Voltages
o 1.53V to 5.5V Operating Voltage Range
o Low 1.2µA Supply Current (0.25µA in Battery-
Backup Mode)
o 145ms (min) Reset Timeout Period
o Battery Freshness Seal
o On-Board Gating of CE Signals, 1.5ns
Propagation Delay (MAX16020/MAX16021)
o Debounced Manual Reset Input
o Watchdog Timer, 1.2s (typ) Timeout
o Power-Fail Comparator and Low-Line Indicator for
Monitoring Voltages Down to 0.6V
o Battery-On, Battery-OK, and Battery Test
Indicators
o Small 10-Pin TDFN or 16-Pin TQFN Packages
o UL®-Certified to Conform to IEC60950-1
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX16016_TB_+T
-40°C to +85°C
10 TDFN-EP*
The first placeholder “_” designates all output options. Letter
“L” indicates push-pull outputs and letter “P” indicates open-
drain outputs. The last placeholder “_” designates the reset
threshold (see Table 1).
T = Tape and reel.
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Selector Guide located at end of data sheet.
Pin Configurations
TOP VIEW
16 15 14 13
BATT 1 +
12 RESET
MR 2
PFI 3
WDI 4
5
MAX16020
11 GND
10 PFO
*EP
9 WDO
678
UL is a registered trademark of Underwriters Laboratories, Inc.
*EP = EXPOSED PAD.
TQFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

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MAX16016 pdf
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Low-Power µP Supervisory Circuits with
Battery-Backup Circuit and Chip-Enable Gating
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 1.53V to 5.5V, VBATT = 3V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
LOW LINE (LL)
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Low Line to Reset Threshold
Voltage
VCC falling
VCC Falling to LL Delay
LL Output Low Voltage
LL Output High Voltage (Push-
Pull Output)
VOL
VOH
VCC falling at 10V/ms
VCC 1.6V, ISINK = 1mA, LL asserted
VCC 1.2V, ISINK = 100µA, LL asserted
VCC = 0.9 x VTH_LL, ISOURCE = 100µA,
LL deasserted
Output Leakage Current
VLL = 5.5V, LL deasserted
BATTERY-OK INDICATOR (BATTOK, BATT_TEST)
BATTOK Threshold
Inferred internally from BATT
BATTOK Output Voltage Low
VOL
VCC = 1.1 x VTH, ISINK = 1mA, reset
asserted
BATTOK Output High Voltage
VOH
VCC = 1.1 x VTH, ISOURCE = 100µA,
BATTOK asserted
(see Table 2)
20
VOUT -
0.3
0.3
0.3
1
mV
µs
V
V
µA
2.508
2.6
VOUT -
0.3
2.673
0.3
V
V
V
BATTOK Output Leakage
Current
VBATTOK = 5.5V, deasserted
1 µA
BATT_TEST Output Low Voltage
VCC = 1.1 x VTH, ISINK = 1mA
0.3 V
Note 2: All devices are 100% production tested at TA = +25°C and TA = +85°C. Limits to -40°C are guaranteed by design.
Note 3: VBATT can be 0V anytime, or VCC can go down to 0V if VBATT is active (except at startup).
Note 4: Use external current-limit resistor to limit current to 20mA (max).
Note 5: CEIN/CEOUT resistance is tested with VCC = 5V and VCEIN = 0V or 5V.
Note 6: WDI is internally serviced within the watchdog period if WDI is left unconnected.
Note 7: The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is
designed for a three-stated output device with a 10µA maximum leakage current and capable of driving a maximum capaci-
tive load of 200pF. The three-state device must be able to source and sink at least 200µA when active.
Table 1a. Reset Threshold Ranges
(MAX16016)
SUFFIX
L
M
T
S
R
Z
Y
W
V
RESET THRESHOLD RANGES (V)
MIN TYP MAX
4.508 4.63 4.906
4.264 4.38 4.635
2.991 3.08 3.239
2.845 2.93 3.080
2.549 2.63 2.755
2.243 2.32 2.425
2.117 2.19 2.288
1.603 1.67 1.733
1.514
1.575
1.639
Table 1b. Reset Threshold Ranges
(MAX16020/MAX16021)
SUFFIX
L
M
T
S
R
Z
Y
W
V
RESET THRESHOLD RANGES (V)
MIN TYP MAX
4.520
4.684
4.852
4.275
4.428
4.585
3.010
3.100
3.190
2.862
2.946
3.034
2.568
2.640
2.716
2.260
2.323
2.390
2.133
2.192
2.255
1.616
1.661
1.710
1.528
1.571
1.618
_______________________________________________________________________________________ 5

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MAX16016 arduino
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Low-Power µP Supervisory Circuits with
Battery-Backup Circuit and Chip-Enable Gating
Pin Description—MAX16020/MAX16021 (continued)
PIN
MAX16020 MAX16021
99
10 10
11 11
12 12
13 13
14 14
15 15
16 16
——
NAME
WDO
PFO
GND
RESET
OUT
CEOUT
CEIN
VCC
EP
FUNCTION
Active-Low Watchdog Output. WDO asserts when WDI remains high or low longer than the
watchdog timeout period. WDO returns high on the next WDI transition or when a reset is
asserted.
Active-Low Power-Fail Comparator Output. PFO goes low when VPFI falls below the internal
0.6V threshold and goes high when VPFT rises above VPFT + VPFT-HYS hysteresis.
Ground
Active-Low Reset Output. RESET asserts when VCC falls below the reset threshold or MR is
pulled low. RESET remains low for the duration of the reset timeout period after VCC rises
above the reset threshold and MR goes high.
Switched Output. OUT is connected to VCC when the reset output is not asserted or when
VCC is greater than VBATT. OUT connects to BATT when RESET is asserted and VBATT is
greater than VCC. Bypass OUT to GND with a 0.1µF (min) capacitor.
Active-Low Chip-Enable Output. CEOUT goes low only when CEIN is low and reset is not
asserted. If CEIN is low when reset is asserted, CEOUT stays low for 12µs (typ) or until
CEIN goes high, whichever occurs first.
Chip-Enable Input. The input to CE gating circuitry. Connect to GND or OUT if not used.
Supply Voltage Input. Bypass VCC to GND with a 0.1µF capacitor.
Exposed Pad. Internally connected to GND. Connect EP to a large ground plane to aid
heat dissipation. Do not use EP as the only ground connection for the device.
______________________________________________________________________________________ 11

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