MAX792LC/D MAXIM [Maxim Integrated Products], MAX792LC/D Datasheet

no-image

MAX792LC/D

Manufacturer Part Number
MAX792LC/D
Description
Microprocessor and Non-Volatile Memory Supervisory Circuits
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.MAX792LCD.pdf (16 pages)
The MAX792/MAX820 microprocessor (µP) supervisory
circuits provide the most functions for power-supply
and watchdog monitoring in systems without battery
backup. Built-in features include the following:
1) µP reset: Assertion of RESET and RESET outputs dur-
2) Manual-reset input.
3) Two-stage power-fail warning: A separate low-line
4) Watchdog fault output: Assertion of WDO if the watch-
5) Pulsed watchdog output: Advance warning of
6) Write protection of CMOS RAM, EEPROM, or other
The MAX792 and MAX820 are identical, except the
MAX820 guarantees higher low-line and reset threshold
accuracy (±2%).
19-0147; Rev. 2; 6/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
ing power-up, power-down, and brownout condi-
tions. RESET is guaranteed valid for V
comparator compares V
120mV above the reset threshold; the low-line and
reset thresholds can be programmed externally.
dog input is not toggled within a preset timeout
period.
impending WDO assertion from watchdog timeout
that causes hardware shutdown.
memory devices.
Computers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
V
CC
________________________________________________________________ Maxim Integrated Products
General Description
CC
to a preset threshold
4
8
5
7
Applications
Microprocessor and Non-Volatile
RESET IN/INT
LLIN/
REFOUT
OVI
SWT
CC
MAX792
down to 1V.
V
GND
CC
12
3
LOW LINE
Memory Supervisory Circuits
CE OUT
RESET
CE IN
OVO
MR
1
13
14
10
6
9
DECODER
ADDRESS
0.1µF
Ordering Information continued at end of data sheet.
* Dice are tested at T
**These parts offer a choice of five different reset threshold volt-
ages. Select the letter corresponding to the desired nominal
reset threshold voltage and insert it into the blank to complete the
part number.
MAX792_CPE
MAX792_CSE
MAX792_C/D
Manual-Reset Input
200ms Power-OK / Reset Time Delay
Independent Watchdog Timer—Preset or Adjustable
On-Board Gating of Chip-Enable Signals
Memory Write-Cycle Completion
10ns (max) Chip-Enable Gate Propagation Delay
Voltage Monitor for Overvoltage Warning
±2% Reset and Low-Line Threshold Accuracy
(MAX820, external programming mode)
PART**
SUFFIX
M
L
T
S
R
Typical Operating Circuit
RAM
A
TEMP. RANGE
= +25°C, DC parameters only.
0°C to +70°C
0°C to +70°C
0°C to +70°C
Ordering Information
A0-A15
NMI
RESET
V
GND
CC
P
RESET THRESHOLD (V)
16 Plastic DIP
16 Narrow SO
Dice*
PIN-PACKAGE
4.62
4.37
3.06
2.91
2.61
Features
1

Related parts for MAX792LC/D

Image
Part Number
Description
Manufacturer
Datasheet
Request R
5962-89877012C
Part Number:
5962-89877012C
Description:
LCC/M°/CIRCUITI INTEGRATI MAXIM
Manufacturer:
Maxim Integrated Products
Datasheet:
5962-89877012C.pdf (36 pages)
MAXPMBAE1#
Part Number:
MAXPMBAE1#
Description:
KIT/E/MAXIM ANALOG ESSENTIALS # COLLECTION OF PLUG-IN EVALUATION MODULES
Manufacturer:
Maxim Integrated Products
MAX3261CCJ
Part Number:
MAX3261CCJ
Description:
Single +5V, fully integrated, 1.25Gbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
MAX3261CCJ.pdf (12 pages)
MAX3263CAG
Part Number:
MAX3263CAG
Description:
Single +5V, fully integrated, 155Mbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
MAX3263CAG.pdf (12 pages)
MAX8809AETL+
Part Number:
MAX8809AETL+
Description:
VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers
Manufacturer:
Maxim Integrated Products
Datasheet:
MAX8809AETL.pdf (50 pages)
MAX1535CETJ+T
Part Number:
MAX1535CETJ+T
Description:
Highly Integrated Level 2 SMBus Battery Chargers
Manufacturer:
Maxim Integrated Products
Datasheet:
MAX1535CETJT.pdf (39 pages)
DS2741N+
Part Number:
DS2741N+
Description:
Current Monitor and Accumulator with Integrated Sense Resistor; ; Temperature Range: -40°C to +85°C
Manufacturer:
Maxim Integrated Products
MAX13450EAUD+T
Part Number:
MAX13450EAUD+T
Description:
TSSOP 14/A°/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
MAX13451EAUD+T
Part Number:
MAX13451EAUD+T
Description:
TSSOP 14/A°/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
MAX17497BATE+
Part Number:
MAX17497BATE+
Description:
QFN 16/A°/AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step
Manufacturer:
Maxim Integrated Products
MAX17502FATB+T
Part Number:
MAX17502FATB+T
Description:
TDFN/A/65V, 1A, 600KHZ, SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED SWI
Manufacturer:
Maxim Integrated Products
MAX1978EVKIT
Part Number:
MAX1978EVKIT
Description:
Integrated Temperature Controller f
Manufacturer:
Maxim Integrated Products
MAX2606EUT+
Part Number:
MAX2606EUT+
Description:
SOT23-6/I°/45MHz to 650MHz, Integrated IF VCOs with Differential Output
Manufacturer:
Maxim Integrated Products
MAX2608EUT+
Part Number:
MAX2608EUT+
Description:
SOT23-6/I°/45MHz to 650MHz, Integrated IF VCOs with Differential Output
Manufacturer:
Maxim Integrated Products
MAX2831EVKIT+
Part Number:
MAX2831EVKIT+
Description:
EVALUATION KIT/2.4GHZ TO 2.5GHZ 802.11G/B RF TRANSCEIVER WITH INTEGRATED PA
Manufacturer:
Maxim Integrated Products

MAX792LC/D Summary of contents

Page 1

Rev. 2; 6/98 General Description The MAX792/MAX820 microprocessor (µP) supervisory circuits provide the most functions for power-supply and watchdog monitoring in systems without battery backup. Built-in features include the following: 1) µP reset: Assertion of RESET and RESET outputs ...

Page 2

Microprocessor and Non-Volatile Memory Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Input Voltage (with respect to GND) V .......................................................................-0.3V to +6V CC All Other Inputs.......................................-0. Input Current GND ................................................................................25mA All Other Outputs ............................................................25mA Continuous Power Dissipation (T = +70°C) A ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 2.65V to 5.5V MIN MAX PARAMETER LOW-LINE COMPARATOR Low-Line Threshold Voltage (Internal Threshold Mode)—V TH Low-Line Threshold Voltage (External Programming Mode) Low-Line Hysteresis (Internal Threshold Mode) LLIN/REFOUT Leakage ...

Page 4

Microprocessor and Non-Volatile Memory Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued 2.65V to 5.5V unless otherwise noted MIN MAX PARAMETER OVERVOLTAGE COMPARATOR OVI Input Threshold OVI ...

Page 5

Operating Characteristics (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. TEMPERATURE 100 SWT = ALL OUTPUTS CC UNLOADED ...

Page 6

Microprocessor and Non-Volatile Memory Supervisory Circuits ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A INTERNAL-MODE RESET THRESHOLD vs. TEMPERATURE (NORMALIZED) 1.125 1.100 1.075 1.050 1.025 1.000 0.975 0.950 THE RESET THRESHOLD IS SHOWN 0.925 NORMALIZED TO 1, ...

Page 7

Description PIN NAME Active-Low Reset Output goes low whenever V RESET 1 old programming mode, or RESET IN falls below 1.30V in external threshold programming mode. RESET remains low for 200ms typ after the threshold is exceeded on power-up. ...

Page 8

Microprocessor and Non-Volatile Memory Supervisory Circuits Detailed Description Manual-Reset Input Many µP-based products require manual-reset capabil- ity, allowing the operator to initiate a reset. The manu- al/external-reset input (MR) can connect directly to a switch without an external pull-up resistor ...

Page 9

RESET IN/ INT LLIN/ 5 REFOUT SWT 11 WDI 7 OVI Figure 1. Block Diagram _______________________________________________________________________________________ Microprocessor and Non-Volatile Memory Supervisory Circuits RESET COMPARATOR V ...

Page 10

Microprocessor and Non-Volatile Memory Supervisory Circuits 25 s MIN TYP RESET OUT 15 s TYP Figure 2. Manual-Reset Timing Diagram MANUAL RESET OTHER RESET * SOURCES . . . * ...

Page 11

REGULATOR RESET IN/INT R1 MAX792 R4 MAX820 LLIN/REFOUT R2 GND LOW LINE 1 RESET R4 Figure 4c. Alternative Connection for External ...

Page 12

Microprocessor and Non-Volatile Memory Supervisory Circuits 1.6sec WDI WDPO 70ns WDO Figure 7. WDI, WDO and WDPO Timing Diagram default is 1.6sec. Select alternative timeout periods by connecting an external capacitor from SWT to GND (see ...

Page 13

Chip-Enable Signal Gating The MAX792/MAX820 provide internal gating of chip- enable (CE) signals, which prevents erroneous data from corrupting CMOS RAM in the event of an under- voltage condition. The MAX792/MAX820 use a series transmission gate from ...

Page 14

Microprocessor and Non-Volatile Memory Supervisory Circuits + MAX792 MAX820 OUT GND 12 * MAXIMUM R VALUE DEPENDS ON P THE NUMBER OF RAMS. MINIMUM R VALUE ...

Page 15

Information (continued) PART** TEMP. RANGE MAX792_EPE -40°C to +85°C MAX792_ESE -40°C to +85°C MAX792_EJE -40°C to +85°C MAX792_MJE -55°C to +125°C MAX820_CPE -0°C to +70°C MAX820_CSE -0°C to +70°C MAX820_EPE -40°C to +85°C MAX820_ESE -40°C to +85°C MAX820_EJE -40°C ...

Page 16

Microprocessor and Non-Volatile Memory Supervisory Circuits ________________________________________________________Package Information 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 ...

Related keywords