MAX7376CMQW [MAXIM]
Silicon Oscillator with Reset Output; 硅振荡器，复位输出
| 型号： | MAX7376CMQW |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Silicon Oscillator with Reset Output |
| 文件： | 总8页 (文件大小：673K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3475; Rev 0; 10/04
Silicon Oscillator with Reset Output
General Description
Features
The MAX7376 silicon oscillator with reset, is a replace-
ment for ceramic resonators, crystals, crystal oscillator
modules, and discrete reset circuits. The MAX7376 pro-
vides the primary clock source and reset function for
microcontrollers in 3V, 3.3V, and 5V applications. The
MAX7376 features a factory-programmed high-speed
oscillator and a microprocessor (µP) power-on-reset
(POR) supervisor.
♦ 2.7V to 5.5V Operation
♦ Accurate Oscillator: 600kHz to 10MHz or 32kHz
♦ Reset Output Holds the µC in Reset for 100µs
After Clock Startup
♦ ±10mA Clock Output Drive Capability
♦ 2% Initial Accuracy
Unlike typical crystal and ceramic resonator oscillator
circuits, the MAX7376 is resistant to vibration and EMI.
The high-output-drive current and absence of high-
impedance nodes make the oscillator less susceptible
to dirty or humid operating conditions. With a wide
operating temperature range as standard, the MAX7376
is a good choice for demanding home appliance,
industrial, and automotive environments.
♦ ±50ppm/°C Temperature Coefficient
♦ 50% Duty Cycle
♦ 5ns Output Rise and Fall Time
♦ Low Jitter: 160psP-P at 8MHz (No PLL)
)
♦ 3mA Operating Current (8MHz)
♦ 13µA Operating Current (32kHz)
♦ -40°C to +125°C Temperature Range
The MAX7376 is available in factory-programmed fre-
quencies from 32.768kHz to 10MHz. See Table 2 for
standard frequencies and contact the factory for cus-
tom frequencies.
Ordering Information
The MAX7376 is available in a 5-pin SOT23 package.
Refer to the MAX7382 data sheet for frequencies
≥10MHz. The MAX7376 standard operating tempera-
ture range is -40°C to +125°C. See the Applications
Information section for the extended operating temper-
ature range.
PIN-
RESET
PART
TEMP RANGE
PACKAGE OUTPUT
MAX7376C_ _ _-T -40°C to +125°C 5 SOT23-5 Open drain
Active high
MAX7376A_ _ _-T -40°C to +125°C 5 SOT23-5
push-pull
Active low
MAX7376B_ _ _-T -40°C to +125°C 5 SOT23-5
push-pull
Applications
White Goods
Standard version is shown in bold.
Automotive
The first letter after the part number designates the reset output
option. Insert the letter corresponding to the desired reset
threshold level from Table 1 in the next position. Insert the two-
letter code from Table 2 in the remaining two positions for the
desired frequency range. See Table 3 for standard part numbers.
Consumer Products
Appliances and Controls
Handheld Products
Portable Equipment
Microcontroller (µC) Systems
Pin Configuration
TOP VIEW
CLOCK
GND
1
2
3
5
E.C.
Typical Application Circuit appears at end of data sheet.
MAX7376
RST/RST
4
V
CC
SOT23
________________________________________________________________ Maxim Integrated Products
1
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.
Silicon Oscillator with Reset Output
ABSOLUTE MAXIMUM RATINGS
V
to GND .............................................................-0.3V to +6V
Operating Temperature Range.........................-40°C to +135°C
Junction Temperature .....................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
CC
All Other Pins to GND ................................-0.3V to (V
CLOCK Current ................................................................±10mA
Continuous Power Dissipation (T = +70°C)
+ 0.3V)
CC
A
5-Pin SOT23
(derate 7.1mW/°C above +70°C) ...................571mW (U5 - 2)
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
(V
= 2.7V to 5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
= 5V and T = +25°C.) (Note 1)
CC A
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
5
UNITS
V
Operating Supply Voltage
V
2.7
CC
f
f
= 8MHz, no load
3
mA
µA
CLOCK
CLOCK
Operating Supply Current
I
CC
= 32.768kHz, no load
13
25
CLOCK OUTPUT
Minimum Operating Voltage
1.65
V
V
V
- 0.4
CC
V
V
= 4.5V, I
= 2.7V, I
= 9mA
CC
CC
SOURCE
Output High Voltage
V
OH
V
- 0.4
CC
= 2.5mA
SOURCE
V
V
V
V
= 4.5V, I
= 2.7V, I
= 20mA
0.4
0.4
+2
+4
CC
CC
CC
CC
SINK
Output Low Voltage
V
V
%
OL
= 10mA
SINK
= 5V, T = +25°C (Note 2)
-2
-4
A
Initial Frequency Accuracy
f
f
CLOCK
= 2.7V to 5.5V, T = +25°C
A
Frequency Temperature
Sensitivity
(Note 3)
±50
±325
ppm/oC
kHz
V
V
= 5V, T = +25°C (Note 2)
32.440 32.768 33.096
CC
CC
A
Initial Frequency Accuracy
(32.768kHz)
CLOCK
= 2.7V to 5.5V, T = +25°C
31.785
33.751
±325
57
A
Frequency Temperature
Sensitivity
32.768kHz (Note 3)
±50
50
ppm/oC
%
CLOCK Output Duty Cycle
43
Observation of 8MHz output for 20s using a
500MHz oscilloscope
CLOCK Output Jitter
160
ps
P-P
CLOCK Output Rise Time
CLOCK Output Fall Time
t
10% to 90%
90% to 10%
5
5
ns
ns
R
t
F
2
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
ELECTRICAL CHARACTERISTICS (continued)
(V
= 2.7V to 5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
= 5V and T = +25°C.) (Note 1)
CC A
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RST/RST OUTPUT
V
2%
-
V
+
TH
2%
TH
T
T
= +25°C
A
A
Reset Threshold
V
V
rising
CC
V
TH+
V
5%
-
V
+
TH
5%
TH
= -40°C to +125°C
Reset Hysteresis
POR Delay
V
V
V
V
V
V
V
V
= {(V
) - ( V )}/(V ) x 100%
2.0
%
THYS
HYST
TH+
TH-
TH-
rising from 0V to (V + 200mV) in 1µs
100
µs
CC
CC
CC
CC
CC
CC
TH
= 4.5V, I
= 2.7V, I
= 4.5V, I
= 2.7V, I
= 9mA
V
V
- 0.4
- 0.4
SOURCE
SOURCE
CC
CC
Output High Voltage
V
V
OH
= 2.5mA
= 20mA
0.4
0.4
1
SINK
SINK
Output Low Voltage
Leakage Current
V
V
OL
= 10mA
= 5.5V, open drain
I
= 5.5V, V
µA
LEAK
RST
Note 1: All parameters are tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Note 2: The frequency is determined by part number selection. See Table 3.
Note 3: Guaranteed by design. Not production tested.
Typical Operating Characteristics
(V
= 5V, T = +25°C, unless otherwise noted.)
CC
A
DUTY CYCLE
vs. SUPPLY VOLTAGE
DUTY CYCLE
vs. TEMPERATURE
SUPPLY CURRENT
vs. TEMPERATURE
55
54
53
52
51
50
49
48
47
46
45
55
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
54
53
52
51
50
49
48
47
46
45
CLOCK = 4MHz
CLOCK = 4MHz
CLOCK = 4MHz
4.3
4.6
4.9
5.2
5.5
-55 -30 -5
20 45 70 95 120
-55 -30 -5
20 45 70 95 120
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Silicon Oscillator with Reset Output
Typical Operating Characteristics (continued)
(V
= 5V, T = +25°C, unless otherwise noted.)
CC
A
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
FREQUENCY
vs. SUPPLY VOLTAGE
FREQUENCY
vs. TEMPERATURE
1.5
4.10
4.08
4.06
4.04
4.02
4.00
3.98
3.96
3.94
3.92
3.90
4.10
4.08
4.06
4.04
4.02
4.00
3.98
3.96
3.94
3.92
3.90
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
CLOCK = 4MHz
CLOCK = 4MHz
CLOCK = 4MHz
4.3
4.6
4.9
5.2
5.5
4.3
4.6
4.9
5.2
5.5
-55 -30 -5
20 45 70 95 120
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
CLOCK OUTPUT WAVEFORM
(C = 10pF)
CLOCK OUTPUT WAVEFORM
(C = 50pF)
CLOCK OUTPUT WAVEFORM
(C = 100pF)
L
L
L
CLOCK
CLOCK
CLOCK
f = 4MHz, C = 10pF
f = 4MHz, C = 50pF
f = 4MHz, C = 100pF
L
L
L
40ns/div
40ns/div
40ns/div
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD
1000
RESET OCCURS
ABOVE THE CURVE
100
RESET = 4.29V
10
0
200
400
600
800
1000
RESET THRESHOLD OVERDRIVE (mV)
4
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
Pin Description
PIN
1
NAME
CLOCK
GND
FUNCTION
Push-Pull Clock Output
2
Ground
3
RST
Reset Output. See the RST Reset Output Options section for more details.
4
V
Positive Supply Voltage. Bypass V
to GND with a 0.1µF capacitor.
CC
CC
5
E.C.
Must Be Externally Connected to V
CC
Oscillator
Detailed Description
The clock output is a push-pull configuration and is
capable of driving a ground-connected 500Ω or a posi-
tive-supply-connected 250Ω load to within 400mV of
either supply rail. The clock output remains stable over
the full operating voltage range and does not generate
short output cycles during either power-on or power-off.
A typical startup characteristic is shown in the Typical
Operating Characteristics.
The MAX7376 is a clock generator with integrated reset
for µCs and UARTs in 3V, 3.3V, and 5V applications
(Figure 1). The MAX7376 is a replacement for crystal
oscillator modules, crystals, or ceramic resonators and
a system-reset IC. The clock frequency is factory
trimmed to specific values. A variety of popular stan-
dard frequencies are available (Table 2). No external
components are required for setting or adjusting the
frequency.
Applications Information
Supply Voltage
The MAX7376 has been designed for use in systems
with nominal supply voltages of 3V, 3.3V, or 5V and is
specified for operation with supply voltages in the 2.7V
to 5.5V range. See the Absolute Maximum Ratings sec-
tion for limit values of power-supply and pin voltages.
Interfacing to a µC Clock Input
The MAX7376 clock output is a push-pull, CMOS, logic
output that directly drives any µP or µC clock input.
There are no impedance-matching issues when using
the MAX7376. The MAX7376 is not sensitive to its posi-
tion on the board and it does not need to be placed right
next to the µP. Refer to the µC data sheet for clock-input
compatibility with external clock signals. The MAX7376
requires no biasing components or load capacitance.
When using the MAX7376 to retrofit a crystal oscillator,
remove all biasing components from the oscillator input.
V
CC
RST Reset Output Options
The MAX7376 is available with three reset output stage
options: push-pull with active-low output, push-pull with
active-high output, and open drain with active-low out-
put. The RST output is asserted when the monitored
BIAS_V
RST/RST
CLOCK
POR
LOGIC
input (V ) drops below the internal V
threshold and
CC
TH-
remains asserted for 100µs after the monitored input
exceeds the internal V threshold. The open-drain
TH+
RST output requires an external pullup resistor.
MUX
Output Jitter
The MAX7376’s jitter performance is given in the
Electrical Characteristics table as a peak-to-peak value
obtained by observing the output of the MAX7376 for
20s with a 500MHz oscilloscope. Jitter values are
approximately proportional to the period of the output
frequency of the device. Thus, a 4MHz part has
approximately twice the jitter value of an 8MHz part.
The jitter performance of clock sources degrades in the
presence of mechanical and electrical interference.
600kHz TO 10MHz
MAX7376
Figure 1. Functional Diagram
_______________________________________________________________________________________
5
Silicon Oscillator with Reset Output
The MAX7376 is relatively immune to vibration, shock,
and EMI influences, and thus provides a considerably
more robust clock source than crystal or ceramic res-
onator-based oscillator circuits.
Power-Supply Considerations
The MAX7376 operates with a 2.7V and 5.5V power-
supply voltage. Good power-supply decoupling is
needed to maintain the power-supply rejection perfor-
mance of the MAX7376. Bypass V
to GND with a
CC
Initial Power-Up and Operation
The clock starts up within 30µs (typ) after V has risen
CC
above the reset threshold. The reset output remains
asserted for 100µs after the reset threshold is reached.
0.1µF surface-mount ceramic capacitor. Mount the
bypass capacitor as close to the device as possible. If
possible, mount the MAX7376 close to the µC’s decou-
pling capacitor so that additional decoupling is not
required. A larger value bypass capacitor is recom-
mended if the MAX7376 is to operate with a large
capacitive load. Use a bypass capacitor value of at
least 1000 times that of the output load capacitance.
Extended Temperature Operation
The MAX7376 was tested to +135°C during product
characterization and shown to function normally at
this temperature (see the Typical Operating
Characteristics). However, production test and qualifi-
cation is only performed from -40°C to +125°C at this
time. Contact the factory if operation outside this range
is required.
Typical Application Circuit
Table 1. Standard Reset Threshold Levels
SUFFIX
RESET THRESHOLD (V)
SUPPLY VOLTAGE
R
2.57
4.29
M
For all other reset threshold options, contact factory.
V
CC
Table 2. Standard Frequencies
OSC1
E.C.
CLOCK
SUFFIX
AA
STANDARD FREQUENCY (MHz)
OSC2
RST
32.768kHz
1
MG
OK
MAX7376
µC
1.8432
3.39545
3.6864
4
RST/RST
QT
QW
RD
RH
4.1943
8
TP
For all other reset threshold options, contact factory.
6
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
Table 3. Standard Part Numbers
RESET THRESHOLD
(V)
FREQUENCY
(Hz)
PART
PIN-PACKAGE
TOP MARK
MAX7376CRAA
MAX7376CRMG
MAX7376CROK
MAX7376CRQT
MAX7376CRQW
MAX7376CRRD
MAX7376CRRH
MAX7376CRTP
MAX7376CMMG
MAX7376CMOK
MAX7376CMQT
MAX7376CMQW
MAX7376CMRD
MAX7376CMRH
MAX7376CMTP
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
2.57
2.57
2.57
2.57
2.57
2.57
2.57
2.57
4.29
4.29
4.29
4.29
4.29
4.29
4.29
32.768k
1M
AEUZ
AEUN
AEUJ
AETT
AETU
AETV
AETW
AESF
AEUM
AEUI
1.8432M
3.39545M
3.6864M
4M
4.1943M
8M
1M
1.8432M
3.39545M
3.6864M
4M
AESH
AETP
AESJ
AETR
AETS
4.1943M
8M
Chip Information
TRANSISTOR COUNT: 2027
PROCESS: BiCMOS
_______________________________________________________________________________________
7
Silicon Oscillator with Reset Output
Package Information
(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.)
PACKAGE OUTLINE, SOT-23, 5L
1
21-0057
E
1
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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