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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX7389 Datasheet

Microcontroller Clock Generator

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MAX7389/MAX7390
Microcontroller Clock Generator
with Watchdog
General Description
The MAX7389/MAX7390 replace ceramic resonators,
crystals, and supervisory functions for microcontrollers in
3.3V and 5V applications.
The MAX7389/MAX7390 provide a clock source, reset,
and watchdog functions. The watchdog timer is pin pro-
grammable and provides watchdog timeout values in the
16ms to 2048ms range. The MAX7389 provides a sepa-
rate watchdog output that is used as a status indicator or
to control safety-critical system elements.
The MAX7390 features a clock-speed select that reduces
the output frequency by half. This functionality allows the
microcontroller to operate at reduced power and may be
used to extend the time available to perform housekeeping
tasks, such as writing data to flash during a power failure.
The MAX7389/MAX7390 clock outputs are factory pro-
grammed to a frequency in the 1MHz to 16MHz range.
Four standard frequencies are available. Other frequen-
cies are available upon request. The maximum operating
supply current is 5.5mA with a clock frequency of 12MHz.
Unlike typical crystal and ceramic resonator oscillator
circuits, the MAX7389/MAX7390 are resistant to EMI and
vibration, and operate reliably at high temperatures. The
high-output drive current and absence of high-impedance
nodes make the oscillator invulnerable to dirty or humid
operating conditions.
The MAX7389/MAX7390 are available in an 8-pin µMAX®
package. The MAX7389/MAX7390 standard operating
temperature range is from -40°C to +125°C.
Applications
●White Goods
●Portable Equipment
●Appliances and Controls ●Microcontroller Systems
●Handheld Products
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations
Features
● Robust Microcontroller Clock and Supervisor in a
Single Package
● Integrated Reset and Watchdog Functions
● Pin-Programmable Watchdog Timeout
● Speed Select
● +2.7V to +5.5V Operation
● Factory-Trimmed Oscillator
● Reset Valid Down to 1.1V Supply Voltage
● ±10mA Clock-Output Drive Current
● ±4% Total Accuracy for -40°C to +125°C
● ±2.75% Total Accuracy for 0°C to +85°C
● 5.5mA Operating Current (12MHz Version)
● -40°C to +125°C Temperature Range
● 8-Pin µMAX Surface-Mount Package
● 1MHz to 16MHz Factory Preset Frequency
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX7389srff
-40oC to +125oC 8 µMAX
MAX7390srff
-40oC to +125oC 8 µMAX
Note: “s” is a placeholder for the reset output type. Insert the
symbol found in Table 3 in the place of “s”. “r” is a placeholder
for the power-on reset (POR) voltage. Insert the symbol found
in Table 2 in the place of “r.” “ff” is a placeholder for the nomi-
nal output frequency. Insert the symbol found in Table 4 in the
place of “ff.” For example, MAX7389CMTP describes a device
with 4.38V reset level, open-collector RST output, and a clock
output frequency of 8MHz.
Typical Application Circuit, Functional Diagram, and
Selector Guide appear at end of data sheet.
TOP VIEW
VCC 1
WDS1 2
WDS2 3
GND 4
MAX7389
8 CLOCK
7 RST/RST
6 WDI
5 WDO
VCC 1
WDS1 2
WDS2 3
GND 4
MAX7390
8 CLOCK
7 RST/RST
6 WDI
5 SPEED
µMAX
µMAX
19-3897; Rev 2; 4/14


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX7389 Datasheet

Microcontroller Clock Generator

No Preview Available !

MAX7389/MAX7390
Microcontroller Clock Generator
with Watchdog
Absolute Maximum Ratings
VCC to GND..........................................................-0.3V to +6.0V
All Other Pins to GND .............................. -0.3V to (VCC + 0.3V)
CLOCK, RST/RST, WDO Output Current ........................±50mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.5mW/°C over +70°C)................362mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(Typical Application Circuit, VCC = +2.7V to +5.5V, TA = -40°C to +125°C, 1MHz to 16MHz output frequency range, typical values at
VCC = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
POWER REQUIREMENTS
Operating Supply Voltage
VCC
Valid RST/RST Supply
Voltage
Operating Supply Current
VCCR
ICC
TA = 0°C to +85°C
TA = -40°C to +125°C
fCLOCK = 12MHz
fCLOCK = 8MHz
TRI-LEVEL ANALOG INPUTS: WDS1, WDS2
Input-High Voltage Level
Input-Middle Voltage Level
Input-Low Voltage Level
LOGIC INPUT: WDI
Input Leakage Current
ILEAK Input high
Logic-Input High Voltage
VIH
Logic-Input Low Voltage
VIL
PUSH-PULL LOGIC OUTPUTS: RST/RST
Output High
VOH ISOURCE = 1mA
Output Low
VOL ISINK = 3mA
OPEN-DRAIN LOGIC OUTPUTS: RST, PFO, WDO
Output Low
VOLO ISINK = 3mA
OUTPUT: CLOCK
Output High Voltage
Output Low Voltage
CLOCK Accuracy
Clock Frequency Temperature
Coefficient
VOHC
VOLC
fCLOCK
ISOURCE = 5mA
ISINK = 5mA
TA = 0°C to +85°C, VCC = 5.0V
TA = -40°C to +125°C, VCC = 5.0V
VCC = 5.0V (Note 2)
Clock Frequency Supply
Voltage Coefficient
TA = +25°C (Note 2)
MIN TYP MAX UNITS
2.7 5.5 V
1.1
1.18
V
5.5
mA
4.5
VCC - 0.55V
0.9
VCC - 1.1V
0.45
V
V
V
0.7 x VCC
0.5
0.3 x VCC
µA
V
V
VCC - 1.5
0.05
0.4
V
V
0.05
0.4
V
VCC - 0.3
-2.75
-4
140
0.3
+2.75
+4
V
V
%
400 ppm/°C
0.67 1 %/V
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX7389
Description Microcontroller Clock Generator
Maker Maxim Integrated
Total Page 12 Pages
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