MAX791CUE Maxim Integrated, MAX791CUE Datasheet

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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:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
MAX791CUE
Manufacturer:
TEMIC
Quantity:
162 654
The MAX791 microprocessor (µP) supervisory circuit
reduces the complexity and number of components need-
ed to monitor power-supply and battery-control functions
in µP systems. The 50µA supply current makes the
MAX791 ideal for use in portable equipment, while the 6ns
chip-enable propagation delay and 250mA output capa-
bility (25mA in battery-backup mode) make it suitable for
larger, higher-performance equipment.
The MAX791 comes in 16-pin DIP, TSSOP, and narrow SO
packages and provides the following functions:
• µP reset.
• Manual-reset input.
• A 1.25V threshold detector provides for power-fail
• Two-stage power-fail warning. A separate low-line
• Backup-battery switchover for CMOS RAM, real-time
• Software monitoring of backup-battery voltage.
• A watchdog-fault output is asserted if the watchdog
• Write protection of CMOS RAM or EEPROM.
• Pulsed watchdog output to give advance warning of
19-0075; Rev. 7; 11/05
MaxCap is a registered trademark of Cesiwid Inc. SuperCap is a registered trademark of Baknor Industries.
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.
Computers
Controllers
Portable/Battery-
Powered Equipment
power-down, and brownout conditions, and is guaran-
teed to be in the correct state for V
even with no battery in the circuit.
warning and low-battery detection, or monitors a
power supply other than +5V.
comparator compares V
above the reset threshold.
clocks, µPs, or other low-power logic.
input has not been toggled within either a preset or
an adjustable timeout period.
impending
TOP VIEW
–
R
—
BATT ON
–
W
E
—
—
VBATT
V
S
—
D
GND
SWT
PFO
—
V
OUT
PFI
E
CC
—
O
________________________________________________________________ Maxim Integrated Products
–
–
T
assertion caused by watchdog timeout.
1
2
3
4
5
6
7
8
output is asserted during power-up,
DIP/SO/TSSOP
General Description
MAX791
Critical µP Power Monitoring
Intelligent Instruments
Pin Configuration
CC
Microprocessor Supervisory Circuit
to a threshold 150mV
16
15
14
13
12
11
10
Applications
9
WDPO
RESET
WDO
CE IN
CE OUT
WDI
LOWLINE
MR
CC
down to 1V,
♦ Precision 4.65V Voltage Monitoring
♦ 200ms Power-OK / Reset Time Delay
♦ Independent Watchdog Timer—Preset or Adjustable
♦ 1µA Standby Current
♦ Power Switching
♦ On-Board Gating of Chip-Enable Signals
♦ MaxCap
♦ Voltage Monitor for Power-Fail or Low-Battery Warning
♦ Backup-Battery Monitor
♦ Guaranteed
* Dice are specified at T
Devices in PDIP, SO and TSSOP packages are available in both
leaded and lead-free packaging. Specify lead free by adding
the + symbol at the end of the part number when ordering.
Lead free not available for CERDIP package.
MAX791CPE
MAX791CSE
MAX791C/D
MAX791CUE
MAX791EPE
MAX791ESE
MAX791EJE
MAX791EUE
MAX791MJE
RESET SOURCES
OTHER SYSTEM
PART
* MaxCap
250mA Output in V
25mA Output in Battery-Backup Mode
Memory Write-Cycle Completion
6ns CE Gate Propagation Delay
+5V
0.1µF
 
0.47F*
+12V
+12V SUPPLY
or SuperCap
FAILURE
–
R
—
Typical Operating Circuit
E
—
S
—
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
E
—
TEMP RANGE
V
VBATT
PFI
PFO
MR
GND
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
T
–
A
CC
Valid to V
Ordering Information
= +25°C.
MAX791
BATT
ON
CC
 
LOWLINE
CE OUT
Compatible
RESET
Mode
CE IN
WDO
V
SWT
WDI
OUT
CC
ADDRESS
DECODE
= 1V
0.1µF
16 Plastic DIP
16 Narrow SO
16 TSSOP
16 Plastic DIP
16 Narrow SO
16 CERDIP
16 TSSOP
16 CERDIP
Dice*
PIN-PACKAGE
Features
I/O
NMI
RESET
INT
A0–A15
µP
CMOS
RAM
1

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MAX791CUE Summary of contents

Page 1

... Voltage Monitor for Power-Fail or Low-Battery Warning CC ♦ Backup-Battery Monitor ♦ Guaranteed PART MAX791CPE MAX791CSE MAX791C/D MAX791CUE MAX791EPE MAX791ESE MAX791EJE MAX791EUE MAX791MJE * Dice are specified at T Devices in PDIP, SO and TSSOP packages are available in both Applications leaded and lead-free packaging. Specify lead free by adding the + symbol at the end of the part number when ordering ...

Page 2

Microprocessor Supervisory Circuit ABSOLUTE MAXIMUM RATINGS Input Voltage (with respect to GND) V .......................................................................-0.3V to +6V CC VBATT..................................................................-0. All Other Inputs.....................................-0. Input Current V Peak ..........................................................................1. Continuous ............................................................250mA CC VBATT Peak ..................................................................250mA VBATT ...

Page 3

Microprocessor Supervisory Circuit ELECTRICAL CHARACTERISTICS (continued 4.75V to 5.5V, VBATT = 2.8V PARAMETER I BATT ON Output Low Voltage I Sink current BATT ON Output Short-Circuit Current Source current RESET, LOW-LINE, AND WATCHDOG TIMER – — ...

Page 4

Microprocessor Supervisory Circuit ELECTRICAL CHARACTERISTICS (continued 4.75V to 5.5V, VBATT = 2.8V PARAMETER V WDI Threshold Voltage IH (Note WDI = 0V WDI Input Current WDI = V POWER-FAIL COMPARATOR PFI Input ...

Page 5

Microprocessor Supervisory Circuit (T = +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE CC (NORMAL OPERATING MODE +5V CC VBATT = 2.8V 54 PFI -60 -30 0 ...

Page 6

Microprocessor Supervisory Circuit (T = +25°C, unless otherwise noted.) A BATTERY CURRENT vs. INPUT SUPPLY VOLTAGE VBATT = 2.8V OUT ( ...

Page 7

Microprocessor Supervisory Circuit PIN NAME 1 VBATT Backup-Battery Input. Connect to external battery or capacitor and charging circuit. Output Supply Voltage threshold. When V OUT CC Connect a 0.1µF capacitor from Input Supply Voltage—+5V ...

Page 8

Microprocessor Supervisory Circuit 150mV 4.65V VBATT CHIP-ENABLE OUTPUT CONTROL OUT 9 RESET MR GENERATION TIMEBASE FOR 8 RESET AND SWT WATCHDOG WATCHDOG 11 TRANSITION WDI DETECTOR 7 PFI 1.25V MAX791 4 GND ...

Page 9

Microprocessor Supervisory Circuit 15 RESET 10k MAX791 Figure 4. Adding an External Pull-Down Resistor Ensures – — — — — – Valid with V Down to GND CC The MAX791’s RESET output ensures that ...

Page 10

Microprocessor Supervisory Circuit +5V 3.6V *1µF +5V REACTIVATE *SETS Q HIGH ON POWER-UP Figure 6. Two Consecutive Watchdog Faults Latch the System in Reset Watchdog-Pulse Output As described in the preceding section, WDPO can be used as the clock input ...

Page 11

Microprocessor Supervisory Circuit V CC RESET THRESHOLD OUT 15µs 100µs RESET RESET Figure 7. Reset and Chip-Enable Timing enables the MAX791 to be used with most µPs high impedance (disabled mode) while RESET is ...

Page 12

Microprocessor Supervisory Circuit FROM REGULATED 3 2 SUPPLY OUT 0.1µF 0.1µF MAX791 1 VBATT 3.0V 15 RESET 10 LOWLINE 11 WDI GND OUT 0.1 µF VOLTAGE MAX791 1 REGULATOR VBATT ...

Page 13

Microprocessor Supervisory Circuit 1 VBATT MAX791 Figure 10. V and VBATT-to-V Switch CC OUT Battery On Output The Battery On (BATT ON) output indicates the status of the internal V /battery-switchover comparator, CC which controls the internal ...

Page 14

Microprocessor Supervisory Circuit + 1N4148 1 VBATT V OUT 0.47F MAX791 GND 4 Figure 12. SuperCap or MaxCap on VBATT Applications Information The MAX791 is not short-circuit protected. Shorting V to ground, other than power-up transients such ...

Page 15

Microprocessor Supervisory Circuit Rp* V OUT OUT MAX791 GND *MAXIMUM Rp VALUE DEPENDS ON THE NUMBER OF RAMs. MINIMUM Rp VALUE IS 1kΩ ACTIVE-HIGH CE LINES FROM LOGIC Figure 13. Alternate CE Gating Monitoring a Negative Voltage ...

Page 16

Microprocessor Supervisory Circuit + PFI MAX791 R2 GND V- +5V PFO 0V V TRIP 1.25 1. TRIP = R1 R2 NOTE NEGATIVE TRIP Figure 15. Monitoring a Negative Voltage close to ...

Page 17

Microprocessor Supervisory Circuit START SET WDI LOW SUBROUTINE OR PROGRAM LOOP, SET WDI HIGH RETURN END Figure 17. Watchdog Flow Diagram ______________________________________________________________________________________ Chip Topography V VBATT WDPO OUT V CC GND BATT ON PFO PFI SWT MR LOWLINE 0.07" (1.778mm) ...

Page 18

Microprocessor Supervisory Circuit (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages ...

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. 19 ____________________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2005 Maxim Integrated Products ...

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