MAX7384AXVT [MAXIM]
Analog Circuit, 1 Func, BICMOS, PDSO5, MO-187CAA, MICRO, SOP-8;
| 型号： | MAX7384AXVT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Analog Circuit, 1 Func, BICMOS, PDSO5, MO-187CAA, MICRO, SOP-8 振荡器 |
| 文件： | 总9页 (文件大小：731K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3493; Rev 0; 11/04
Silicon Oscillator with Low-Power Frequency
Switching and Reset Output
General Description
Features
The MAX7384 dual-speed silicon oscillator replaces
ceramic resonators, crystals, and crystal-oscillator
modules as the primary and secondary clock source for
microcontrollers in 3V, 3.3V, and 5V applications. The
MAX7384 features a factory-programmed high-speed
oscillator, a 32.768kHz oscillator, a clock-selector input,
and a µP power-on-reset (POR) supervisor. The clock
output can be switched at any time between the high-
speed clock and the 32.768kHz clock for low-power
operation. Switchover is synchronized internally to pro-
vide glitch-free clock switching.
♦ 2.7V to 5.5V Operation
♦ High-Speed Oscillator from 10MHz to 16MHz
Low-Speed 32kHz Oscillator
Glitch-Free Clock-Speed Switching
♦ Integrated POR
♦ ±10mA Clock-Output Drive Capability
♦ 2.5% Initial Accuracy
♦ ±50ppm/°C Frequency Drift
♦ 50% Duty Cycle
♦ 5ns Output Rise and Fall Time
Unlike typical crystal and ceramic-resonator oscillator
circuits, the MAX7384 is resistant to vibration and EMI.
The high-output-drive current and absence of high-
impedance nodes makes the oscillator less susceptible
to dirty or humid operating conditions. With a wide oper-
ating temperature range as standard, the MAX7384 is a
good choice for demanding home appliance, industrial,
and automotive environments.
♦ Low Jitter: 80ps
at 16MHz
P-P
♦ 4mA Operating Current at 16MHz
♦ 13µA, 32kHz Operating Current
♦ -40°C to +125°C Temperature Range
Ordering Information
PIN-
PACKAGE
RESET
OUTPUT
The MAX7384 is available with factory-programmed fre-
quencies ranging from 10MHz to 16MHz. See Table 1
for standard frequencies and contact the factory for
custom frequencies. Refer to the MAX7378 data sheet
for frequencies less than 10MHz.
PART*
TEMP RANGE
Active high
push-pull
MAX7384A_ _ _ -40°C to +125°C 8 µMAX
Active low
push-pull
®
The MAX7384 is available in an 8-pin µMAX package.
MAX7384B_ _ _ -40°C to +125°C 8 µMAX
MAX7384C_ _ _ -40°C to +125°C 8 µMAX
The MAX7384 standard operating temperature range is
-40°C to +125°C. See the Applications Information sec-
tion for extended operating temperature range.
Open drain
*Standard version is shown in bold. 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.
Table 1 and Table 2 are located at the end of the data sheet.
Applications
White Goods
Automotive
Consumer Products
Appliances and Controls
Handheld Products
Portable Equipment
Microcontroller Systems
Typical Application Circuit
V
2.7V TO 5.5V
CC
0.1µF
0.1µF
V
CC
V
L
OSC1
CLOCK
OSC2
RST
MAX7384
GND
E.C.
RST/RST
SPEED
µC
I/O PORT
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configuration appears at end of data sheet.
________________________________________________________________ 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 Low-Power Frequency
Switching and Reset Output
ABSOLUTE MAXIMUM RATINGS
V
to GND...........................................................-0.3V to +6.0V
Operating Temperature Range .........................-55°C to +135°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
All Other Pins to GND.................................-0.3V to (V
CLOCK, RST Current ....................................................... 50mA
Input Current (SPEED)...................................................... 50mA
+ 0.3V)
CC
Continuous Power Dissipation (T = +70°C)
A
8-Pin µMAX (derate 4.5mW/°C above +70°C) ...362mW (U8-1)
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 Operating Circuit, V
= 2.7V to 5.5V, V = V , T = -40°C to +125°C. Typical values are at V
= 5.0V, T = +25°C,
CC A
CC
L
CC
A
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage
V
2.7
5.5
V
CC
f
= 16MHz, T = -40°C to +125°C, no
A
CLOCK
8.7
8.0
6.5
6.0
5.4
25
load
f
= 14.7456MHz, T = -40°C to
A
CLOCK
+125°C, no load
f
= 12MHz, T = -40°C to +125°C, no
CLOCK
A
mA
µA
load
Operating Supply Current
I
CC
f
= 11.0592MHz, T = -40°C to
A
CLOCK
+125°C, no load
f
= 10MHz, T = -40°C to +125°C, no
CLOCK
A
load
f
= 32.768kHz, T = -40°C to
A
CLOCK
13
+125°C, no load
LOGIC INPUTS (SPEED)
Input High Voltage
Input Low Voltage
Input Current
V
0.7 x V
IH
CC
V
V
0.3 x V
CC
IL
µA
I
V
= SPEED= 5.5V
CC
2
IN
CLOCK OUTPUT
V = 4.5V, I
= 7.0mA
= 2.0mA
L
SOURCE
Output High Voltage
Output Low Voltage
V
V - 0.4
L
V
V
OH
V = 2.7V, I
L
SOURCE
V = 4.5V, I
= 20mA
L
SINK
SINK
V
0.4
OL
V = 2.7V, I
L
= 10mA
V
= 5V, T = +25°C, deviation from
A
CC
-2.5
-5
+2.5
+3.5
±350
selected frequency
Initial Fast Clock Frequency
Accuracy
f
%
CLOCK
V
= 2.7V to 5.5V, T = +25°C,
CC
A
deviation from selected frequency
Fast Clock Temperature
Coefficient
T
= -40°C to +125°C
±50
ppm/°C
A
2
_______________________________________________________________________________________
Silicon Oscillator with Low-Power Frequency
Switching and Reset Output
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V
= 2.7V to 5.5V, V = V , T = -40°C to +125°C. Typical values are at V
= 5.0V, T = +25°C,
CC A
CC
L
CC
A
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
= 5V, T = +25°C
MIN
TYP
MAX
UNITS
V
32.268 32.768 33.268
31.768 32.768 33.768
CC
CC
A
Slow Clock Frequency
f
kHz
CLOCK
V
= 2.7V to 5.5V, T = +25°C
A
Slow Clock Temperature
Coefficient
T
= -40°C to +125°C
±50
50
±325
ppm/°C
%
A
Duty Cycle
(Note 2)
40
60
Observation of 16MHz for 20s using a
12GHz oscilloscope
Output Jitter
80
ps
P-P
Output Rise Time
Output Fall Time
t
10% to 90%
90% to 10%
5
5
ns
R
t
ns
F
T
T
= +25°C
-2
-5
+2
+5
A
A
V
rising, deviation
CC
Power-On-Reset Threshold
V
TH
%
= -40°C to
from nominal threshold
+125°C
Difference between rising and falling
thresholds
Power-On-Reset Hysteresis
V
1
%
HYST
Power-On-Reset Delay
PORdly
V
rising from 0 to 5V in 1µs at +25°C
122
µs
CC
RESET OUTPUT
V
0.4
-
-
CC
V = 4.5V, I
= 7.0mA
= 2.0mA
L
SOURCE
Output High Voltage
(Note 3)
V
V
V
OH
V
0.4
CC
V = 2.7V, I
L
SOURCE
V = 4.5V, I
= 20mA
0.4
0.4
L
SINK
Output Low Voltage
V
OL
V = 2.7V, I
= 10mA
L
SOURCE
Note 1: All parameters tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Note 2: Guaranteed by design. Not production tested.
Note 3: For push-pull output only.
_______________________________________________________________________________________
3
Silicon Oscillator with Low-Power Frequency
Switching and Reset Output
Typical Operating Characteristics
(V
= V = 5V, T = +25°C, frequency = 10MHz, unless otherwise noted.)
L A
CC
DUTY CYCLE vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
DUTY CYCLE vs. TEMPERATURE
3.25
3.20
3.15
3.10
3.05
3.00
2.95
2.90
51
50
49
48
47
46
45
50.5
50.0
49.5
49.0
48.5
48.0
FREQUENCY = 11.0592MHz
FREQUENCY = 10MHz
FREQUENCY = 10MHz
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
-55
-17
21
59
97
135
-55
-17
21
59
97
135
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY DEVIATION
vs. TEMPERATURE
FREQUENCY DEVIATION
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
2.0
1.5
4
4.0
FREQUENCY = 11.0592MHz
FREQUENCY = 10MHz
FREQUENCY = 11.0592MHz
3
2
3.5
3.0
2.5
2.0
1.5
1.0
0.5
1
0
0
-0.5
-1.0
-1.5
-2.0
-1
-2
-3
-4
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
-55
-17
21
59
97
135
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
CLOCK OUTPUT WAVEFORM
CLOCK OUTPUT WAVEFORM
(C = 10pF)
L
SETTLING TIME FROM START
(C = 50pF)
L
MAX7384 toc08
MAX7384 toc07
MAX7384 toc09
CH1 FREQ
9.992MHz
LOW RESOLUTION
20ns/div
10µs/div
20ns/div
CHANNEL 1 = CLOCK, CHANNEL 2 = V
CC
4
_______________________________________________________________________________________
Silicon Oscillator with Low-Power Frequency
Switching and Reset Output
Typical Operating Characteristics (continued)
(V
= V = 5V, T = +25°C, frequency = 10MHz, unless otherwise noted.)
L A
CC
HIGH-SPEED TO LOW-SPEED
TRANSITION
CLOCK OUTPUT WAVEFORM
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
(C = 100pF)
L
MAX7384 toc12
MAX7384 toc10
1
0.1
0.01
1m
10m
100m
1µ
V
= 4.32V
RESET
0.14
10µs/div
20ns/div
0.04
0.09
0.19
0.24
RESET THRESHOLD OVERDRIVE (V)
CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED
HIGH-SPEED TO LOW-SPEED
TRANSITION
LOW-SPEED TO HIGH-SPEED
TRANSITION
LOW-SPEED TO HIGH-SPEED
TRANSITION
MAX7384 toc13
MAX7384 toc14
MAX7384 toc15
40ns/div
CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED
10µs/div
100ns/div
CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED
CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED
SUPPLY CURRENT vs. FREQUENCY
5
4
3
2
1
10
11
12
13
14
15
16
FREQUENCY (MHz)
_______________________________________________________________________________________
5
Silicon Oscillator with Low-Power Frequency
Switching and Reset Output
Pin Description
PIN
1
FUNCTION
NAME
V
Positive Supply Voltage. Bypass V
to GND with a 0.1µF capacitor.
CC
CC
Output Supply Voltage. Bypass V to GND with a 0.1µF capacitor. V must be connected to V .
CC
2
V
L
L
L
Clock-Speed Select Input. Drive SPEED low to select the 32kHz fixed frequency. Drive SPEED high
to select factory-trimmed frequency.
3
SPEED
4
5
6
7
8
RST
CLOCK
GND
E.C.
Reset Output. Open-drain or push-pull output. See the Ordering Information.
Push-Pull Clock Output
Ground
Externally Connected. Connect to Vcc.
No Connection. Not internally connected.
N.C.
Clock-Speed Selection
Detailed Description
Drive SPEED low to select slow clock speed (nominally
32.768kHz) or high to select full clock speed. SPEED can
The MAX7384 is a dual-speed clock generator with inte-
grated reset for microcontrollers (µCs) and UARTs in 3V,
3.3V, and 5V applications. The MAX7384 is a replace-
ment for crystal-oscillator modules, crystals, or ceramic
resonators and a system reset IC. The high-speed clock
frequency and reset threshold voltage are factory
trimmed to specific values (see Table 1). A variety of
popular standard frequencies are available. The low-
speed clock frequency is fixed at 32.768kHz; see Table
2. No external components are required for setting or
adjusting the frequency.
be connected to V
or to GND to select fast or slow
CC
clock speed, or connected to a logic output (such as a µP
GPIO port) used to change clock speed on the fly. If
SPEED is connected to a µP GPIO port, connect a pullup
or pulldown resistor to set the clock to the preferred
speed on power-up. SPEED input bias current is 2µA
(max), so a resistor value as high as 500kΩ can be used.
Applications Information
Interfacing to a Microcontroller
Clock Input
Oscillator
The push-pull clock output drives a 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 changing of the frequency. A typical oscillating start-
up is shown in the Typical Operating Characteristics.
The MAX7384 clock output is a push-pull, CMOS, logic
output that directly drives a µP or µC clock input. There
are no impedance-matching issues when using the
MAX7384. Refer to the microcontroller data sheet for
clock input compatibility with external clock signals.
The MAX7384 requires no biasing components or load
capacitance. When using the MAX7384 to retrofit a
crystal oscillator, remove all biasing components from
the oscillator input.
V
2.7V TO 5.5V
CC
V
L
Reset Output
The MAX7384 is available with three reset output stage
options: push-pull active low, push-pull active high, and
open-drain active low. RST is asserted when the moni-
RST
POR
MAX7384
32kHz
(LF OSCILLATOR)
tored input (V ) drops below the internal V
threshold
CC
TH-
and remains asserted for 120µs after the monitored input
exceeds the internal V threshold. The open-drain
SPEED
CLOCK
LOGIC
MUX
TH+
RST output requires an external pullup resistor.
10MHz TO 16MHz
(HF OSCILLATOR)
Output Jitter
The MAX7384’s jitter performance is given in the
Electrical Characteristics table as a peak-to-peak value
obtained by observing the output of the MAX7384 for
GND
Figure 1. Functional Diagram
6
_______________________________________________________________________________________
Silicon Oscillator with Low-Power Frequency
Switching and Reset Output
20s with a 12GHz oscilloscope. Jitter measurements
Table 1. Standard Reset Threshold
Levels
are approximately proportional to the output period of
the device. Thus, a 10MHz device has approximately
twice the jitter value of a 20MHz device. The jitter per-
formance of all clock sources degrades in the pres-
ence of mechanical and electrical interference. The
MAX7384 is relatively immune to vibration, shock, and
EMI influences and thus provides a considerably more
robust clock source than crystal or ceramic resonator-
based oscillator circuits.
SUFFIX
RESET THRESHOLD (V)
2.50
X
V
R
Q
P
N
J
2.71
2.89
3.13
3.34
3.44
3.96
4.38
Standard value
Initial Power-Up and Operation
An internal power-up reset asserts RST until the supply
voltage has risen above the power-on-reset threshold
M
Standard value
Contact factory for nonstandard reset threshold options.
(V
).
TH+
RST holds the microcontroller in a reset condition until
120µs after V has risen above V . This reset delay
Table 2. Standard Frequencies
CC
TH+
ensures that the clock output and the microcontroller’s
internal clock circuits have stabilized before the system
is allowed to start. Typical microcontroller reset delay
ranges from 1ms to 250ms to allow a slow crystal oscil-
lator circuit to start up. The MAX7384 has a fast startup,
eliminating the need for such a long reset delay.
SUFFIX
UK
STANDARD FREQUENCY (MHz)
10
11.0592
12
UT
VB
VT
14.7456
16
WB
Extended Temperature Operation
The MAX7384 was tested to +135°C during product char-
acterization and shown to function normally at this tem-
perature (see the Typical Operating Characteristics).
However, production test and qualification is only per-
formed from -40°C to +125°C at this time. Contact the fac-
tory if operation outside this range is required.
For all other frequency options, contact factory.
Table 3. Standard Part Numbers
RESET
OUTPUT THRESHOLD
TYPE
RESET
FREQUENCY
(MHz)
PART
Power-Supply Considerations
The MAX7384 operates with a 2.7V and 5.5V power-
(V)
supply voltage. V
provides power to the the internal
MAX7384CRUK Open drain
MAX7384CRUT Open drain
MAX7384CRVB Open drain
MAX7384CRVT Open drain
MAX7384CRWB Open drain
MAX7384CMUK Open drain
MAX7384CMUT Open drain
MAX7384CMVB Open drain
MAX7384CMVT Open drain
MAX7384CMWB Open drain
2.89
2.89
2.89
2.89
2.89
4.38
4.38
4.38
4.38
4.38
10
11.0592
12
CC
circuitry and V supplies power to the clock and reset
L
outputs. Good power-supply decoupling is needed to
maintain the power-supply rejection performance of the
14.7456
16
MAX7384. Bypass both V
and V to GND with a
L
CC
0.1µF surface-mount ceramic capacitor. Mount the
bypassing capacitors as close to the device as possi-
ble. Use a larger value bypass capacitor if the MAX7384
is to operate with a large capacitive load. Use a bypass
capacitor value of at least 1000 times that of the output
load capacitance.
10
11.0592
12
14.7456
16
_______________________________________________________________________________________
7
Silicon Oscillator with Low-Power Frequency
Switching and Reset Output
Pin Configuration
Chip Information
TRANSISTOR COUNT: 2937
PROCESS: BiCMOS
TOP VIEW
V
1
2
3
4
8
7
6
5
N.C.
CC
V
E.C.
L
MAX7384
SPEED
RST
GND
CLOCK
µMAX
8
_______________________________________________________________________________________
Silicon Oscillator with Low-Power Frequency
Switching and 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.)
4X S
8
8
MILLIMETERS
INCHES
DIM MIN
MAX
MAX
MIN
-
-
0.043
0.006
0.037
0.014
0.007
0.120
1.10
0.15
0.95
0.36
0.18
3.05
A
0.002
0.030
0.010
0.005
0.116
0.05
0.75
0.25
0.13
2.95
A1
A2
b
E
H
ÿ 0.50±0.1
c
D
e
0.0256 BSC
0.65 BSC
0.6±0.1
E
H
0.116
0.188
0.016
0∞
0.120
2.95
4.78
0.41
0∞
3.05
5.03
0.66
6∞
0.198
0.026
6∞
L
1
1
α
S
0.6±0.1
0.0207 BSC
0.5250 BSC
BOTTOM VIEW
D
TOP VIEW
A1
A2
A
c
α
e
L
b
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0036
J
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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