MAX3248EEAI+ Maxim Integrated, MAX3248EEAI+ Datasheet

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MAX3248EEAI+

Manufacturer Part Number
MAX3248EEAI+
Description
RS-232 Interface IC
Manufacturer
Maxim Integrated
Series
MAX3238E, MAX3248Er
Datasheet
The MAX6715–MAX6729 are ultra-low-voltage microproces-
sor (µP) supervisory circuits designed to monitor two or three
system power-supply voltages. These devices assert a sys-
tem reset if any monitored supply falls below its factory-
trimmed or adjustable threshold and maintain reset for a
minimum timeout period after all supplies rise above their
thresholds. The integrated dual/triple supervisory circuits sig-
nificantly improve system reliability and reduce size com-
pared to separate ICs or discrete components.
These devices monitor primary supply voltages (V
1.8V to 5.0V and secondary supply voltages (V
0.9V to 3.3V with factory-trimmed reset threshold voltage
options (see Reset Voltage Threshold Suffix Guide). An
externally adjustable RSTIN input option allows customers to
monitor a third supply voltage down to 0.62V. These devices
are guaranteed to be in the correct reset output logic state
when either V
A variety of push-pull or open-drain reset outputs along with
watchdog input, manual reset input, and power-fail input/out-
put features are available (see Selector Guide). Select reset
timeout periods from 1.1ms to 1120ms (min) (see Reset
Timeout Period Suffix Guide). The MAX6715–MAX6729 are
available in small 5, 6, and 8-pin SOT23 packages and oper-
ate over the -40°C to +85°C temperature range.
19-2325; Rev 5; 12/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
UNREGULATED
DC
Multivoltage Systems
Telecom/Networking Equipment
Computers/Servers
Portable/Battery-Operated Equipment
Industrial Equipment
Printer/Fax
Set-Top Boxes
R1
R2
CC
IN
PUSHBUTTON
SWITCH
1 or V
CONVERTER
Typical Operating Circuit
DC/DC
________________________________________________________________ Maxim Integrated Products
Dual/Triple Ultra-Low-Voltage SOT23 µP
CC
OUT2
OUT1
2 remains greater than 0.8V.
General Description
RSTIN/PFI
MR
V
CC
MAX67_ _
1
V
CC
Applications
2
RST
WDI
PFO
RESET
I/O
NMI
SUPPLY
I/O
CC
1.8V
CC
µP
SUPPLY
2) from
CORE
1) from
0.9V
♦ V
♦ V
♦ Externally Adjustable RSTIN Threshold for
♦ Watchdog Timer Option
♦ Manual Reset Input Option
♦ Power-Fail Input/Power-Fail Output Option
♦ Guaranteed Reset Valid Down to V
♦ Reset Output Logic Options
♦ Immune to Short V
♦ Low Supply Current 14µA (typ) at 3.6V
♦ Small 5, 6, and 8-Pin SOT23 Packages
Note: The first “_ _” are placeholders for the threshold voltage
levels of the devices. Desired threshold levels are set by the part
number suffix found in the Reset Voltage Threshold Suffix Guide.
The “_” after the D is a placeholder for the reset timeout delay
time. Desired delay time is set using the timeout period suffix
found in the Reset Timeout Period Suffix Guide. For example the
MAX6716UTLTD3-T is a dual-voltage supervisor V
V
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing "-T" with "+T" when ordering.
Ordering Information continued at end of data sheet.
Pin Configurations and Selector Guide appear at end of
data sheet.
MAX6715UT_ _D_ -T
MAX6716UT_ _D_ -T
MAX6717UK_ _D_ -T
MAX6718UK_ _D_ -T
MAX6719UT_ _D_ -T
MAX6720UT_ _D_ -T
TH
from 1.58V to 4.63V
Voltages from 0.79V to 3.08V
Auxiliary/Triple-Voltage Monitoring
(0.62V internal reference)
(Push-Pull and Open-Drain Active-Low)
V
2 = 3.075V, and 210ms (typ) timeout period.
CC
CC
CC
35s (min) Long Startup Period
1.12s (min) Normal Timeout Period
Supervisory Circuits
1 (primary supply) Reset Threshold Voltages
2 (secondary supply) Reset Threshold
2 = 0.8V
PART
Ordering Information
CC
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Transients
CC
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
5 SOT23-5
5 SOT23-5
6 SOT23-6
6 SOT23-6
Features
1 or
TH
1 = 4.625V,
1

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MAX3248EEAI+ Summary of contents

Page 1

... RSTIN/PFI MR R2 MAX67_ _ PUSHBUTTON SWITCH ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Supervisory Circuits ♦ from 1.58V to 4.63V ♦ Voltages from 0.79V to 3.08V ♦ ...

Page 2

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND ..........................................................-0. RST, RST1, RST2, PFO, RST ................-0.3V to +6V Open-Drain Push-Pull RST, RST1, PFO, RST...............-0. ...

Page 3

Dual/Triple Ultra-Low-Voltage SOT23 µP ELECTRICAL CHARACTERISTICS (continued 0.8V to 5.5V, GND = PARAMETER SYMBOL V to Reset Output Delay CC Reset Timeout Period ADJUSTABLE RESET COMPARATOR INPUT (MAX6719/MAX6720/MAX6723–MAX6727) RSTIN Input ...

Page 4

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued 0.8V to 5.5V, GND = PARAMETER SYMBOL RESET/POWER-FAIL OUTPUTS RST/RST1/RST2/PFO Output LOW V (Push-Pull or Open-Drain) RST/RST1/PFO Output HIGH V (Push-Pull ...

Page 5

Dual/Triple Ultra-Low-Voltage SOT23 µ 5V 3.3V +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE 5V 3. TOTAL 14 12 ...

Page 6

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits ( 5V 3.3V +25°C, unless otherwise noted RESET INPUT TO RESET OUTPUT DELAY vs. TEMPERATURE 24.4 30mV OVERDRIVE 24.2 24.0 23.8 23.6 23.4 23.2 ...

Page 7

Dual/Triple Ultra-Low-Voltage SOT23 µP MAX6715/ MAX6717/ MAX6719/ MAX6721/ MAX6716 MAX6718 MAX6720 MAX6722 5 — — _______________________________________________________________________________________ Supervisory Circuits PIN MAX6723/ MAX6725/ MAX6727 MAX6724 MAX6726 — — — — ...

Page 8

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits MAX6715/ MAX6717/ MAX6719/ MAX6721/ MAX6716 MAX6718 MAX6720 MAX6722 — — — — — 5 — — — 8 _______________________________________________________________________________________ PIN MAX6723/ MAX6725/ MAX6727 MAX6724 MAX6726 — — ...

Page 9

Dual/Triple Ultra-Low-Voltage SOT23 µP MAX6715/ MAX6717/ MAX6719/ MAX6721/ MAX6716 MAX6718 MAX6720 MAX6722 — — — — — — Detailed Description The MAX6715–MAX6729 microprocessor (µP) supervi- sory circuits maintain system integrity by alerting the µP to fault conditions. These ICs are ...

Page 10

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits restarts. The MAX6715/MAX6717/MAX6719/MAX6721/ MAX6723/MAX6725/MAX6727/MAX6728 contain open- drain reset outputs, while the MAX6716/MAX6718/ MAX6720/MAX6722/MAX6724/MAX6726/MAX6729 contain push-pull reset outputs. The MAX6727 provides two separate open-drain RST outputs driven by the same internal logic. Manual Reset Input ...

Page 11

Dual/Triple Ultra-Low-Voltage SOT23 µ MAX6728/ MAX6729 R1 V PFI PFO R2 GND MAX6728/ MAX6729 R1 V TRIP PFI PFO V = 626.5mV PFI GND Figure 3. Using Power-Fail Input to Monitor ...

Page 12

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits PFO V MAX6728/ EXT MAX6729 R1 PFI PFO V = DESIRED V GOOD EXT DESIRED V FAIL EXT (FOR PUSH-PULL PFO ...

Page 13

Dual/Triple Ultra-Low-Voltage SOT23 µ REF RSTIN/PFI V REF V REF/2 ______________________________________________________________________________________ Supervisory Circuits Functional Diagram PULLUP RESET RESET TIMEOUT OUTPUT PERIOD DRIVER ...

Page 14

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits NUMBER OF OPEN- PART VOLTAGE DRAIN NUMBER RESET MONITORS MAX6715 2 MAX6716 2 MAX6717 2 MAX6718 2 MAX6719 3 MAX6720 3 MAX6721 2 MAX6722 2 MAX6723 3 MAX6724 3 MAX6725 3 MAX6726 3 MAX6727 ...

Page 15

Dual/Triple Ultra-Low-Voltage SOT23 µP Table 1. Reset Voltage Threshold Suffix Guide** PART NUMBER V 1 NOMINAL CC SUFFIX VOLTAGE (_ _) THRESHOLD (V) LT 4.625 MS 4.375 MR 4.375 TZ 3.075 SY 2.925 RY 2.625 TW 3.075 SV 2.925 RV ...

Page 16

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits TOP VIEW RST1 1 6 MAX6715/ GND 2 5 MAX6716 SOT23 RST 1 6 MAX6721/ GND 2 5 MAX6722 SOT23 RST 1 GND 2 WDI 3 RST 4 ...

Page 17

Dual/Triple Ultra-Low-Voltage SOT23 µP (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Supervisory Circuits Package Information PACKAGE OUTLINE, SOT-23, 5L 21-0057 ...

Page 18

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 18 ______________________________________________________________________________________ Package Information (continued) PACKAGE OUTLINE, SOT 6L BODY 21-0058 ...

Page 19

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2005 Maxim Integrated Products ...

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