19-3876; Rev 0; 5/06
Precision Silicon Oscillators with
Enable or Autoenable
General Description
The MAX7393/MAX7394 precision silicon oscillators
replace crystals, ceramic resonators, and crystal oscillator
modules in systems with a +2.4V to +3.6V operating sup-
ply voltage range.
The MAX7393/MAX7394 consist of a temperature-com-
pensated precision oscillator with enable (MAX7394) or
autoenable (MAX7393). The MAX7393/MAX7394 are sup-
plied at specific frequencies, just like crystals and res-
onators. Output frequency accuracy is guaranteed to be
within ±0.25% (TDFN) and ±1.3% (µDFN) (0°C to +85°C)
and ±1.0% (TDFN) and ±1.8% (µDFN) over the -40°C to
+125°C temperature range.
The small size and robust operation of the MAX7393/
MAX7394 make them ideal for space-constrained or envi-
ronmentally demanding applications where high accura-
cy is required. The high accuracy of the MAX7393/
MAX7394 is ideal for use in USB applications, computers,
and white goods.
The MAX7393/MAX7394 are available in 6-pin, 3mm x
3mm TDFN and 2mm x 2mm µDFN packages. They are
specified for the -40°C to +125°C temperature range.
Features
♦
±0.25% (TDFN) and ±1.3% (µDFN) Total Accuracy
for 0°C to +85°C
♦
±1.0% (TDFN) and ±1.8% (µDFN) Total Accuracy
for -40°C to +125°C
♦
Resistant to Humidity and Vibration
♦
12mA Operating Current (48MHz Version)
♦
5ns Output Rise/Fall Time
♦
40% to 60% Maximum Duty Cycle
♦
No External Components Required
♦
+2.4V to +3.6V Operation
♦
Available Factory-Set Frequencies from 922kHz to
48MHz
♦
Space-Saving TDFN and µDFN Surface-Mount
Packages
MAX7393/MAX7394
Applications
USB
CAN Nodes
Automotive Systems
Computers
Handheld Products
White Goods
PART*
MAX7393
ALT_ _+
MAX7393ATT_ _+
MAX7394
ALT_ _+
MAX7394ATT_ _+
6
1
V
CC2
V
CC
CLOCK
5
OSC1
µC
Ordering Information
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
6 µDFN
6 TDFN
6 µDFN
6 TDFN
PKG
CODE
L622-1
T633-1
L622-1
T633-1
Typical Application Circuits
2.4V TO 3.6V
*The
two-letter frequency suffix following the part number is found
in the
Selector Guide.
+Denotes
lead-free package.
Note:
The MAX7394 is available in factory-set frequencies from
922kHz to 48MHz. The MAX7393 is available in factory-set
frequencies from 922kHz to 20MHz. There are 10 standard
frequencies
(see
the
Selector Guide)
with a required 2.5k order
increment. Nonstandard frequencies are also available with a
required 10k order increment. For nonstandard versions,
contact factory for availability and ordering information.
MAX7393
CLKIN
I.C.
3
GND
2
4
OSC2
2.4V TO 3.6V
6
1
V
CC2
V
CC
CLOCK
5
OSC1
µC
MAX7394
4
ENABLE
I.C.
3
OSC2
GND
2
Selector Guide and Pin Configurations appear at end of
data sheet.
1
________________________________________________________________
Maxim Integrated Products
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.
Precision Silicon Oscillators with
Enable or Autoenable
MAX7393/MAX7394
ABSOLUTE MAXIMUM RATINGS
V
CC
, V
CC2
to GND.................................................-0.3V to +4.0V
CLOCK, CLKIN, ENABLE, I.C. to GND ......-0.3V to (V
CC
+ 0.3V)
CLOCK Output Current ....................................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
6-Pin µDFN (derate 4.5mW/°C over +70°C) ................358mW
6-Pin TDFN (derate 18.2mW/°C over +70°C) ............1455mW
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
(V
CC
= V
CC2
= +2.4V to +3.6V, C
L
= 10pF, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= V
CC2
= +3.3V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
DC CHARACTERISTICS
Operating Supply Voltage
Operating Output Supply Voltage
V
CC
V
CC2
922kHz, MAX739_ _ _ _LY
4MHz, MAX739_ _ _ _RD
8MHz, MAX739_ _ _ _TP
Total Operating Supply Current
(Note 2)
I
TOT
16MHz, MAX739_ _ _ _WB
32MHz, MAX7394_ _ _ YN
33MHz, MAX7394_ _ _ YQ
48MHz, MAX7394_ _ _ ZY
Total Shutdown Supply Current
LOGIC INPUTS (ENABLE, CLKIN)
Logic Input High Voltage
Logic Input Low Voltage
CLOCK OUTPUT
Output High Voltage
Output Low Voltage
Output Rise Time
Output Fall Time
Duty Cycle
Startup Time
Output Jitter (Note 3)
V
OH
V
OL
t
R
t
F
V
CC2
≥
2.4V, I
SOURCE
= 5mA
V
CC2
≥
2.4V, I
SINK
= 5mA
(Note 3)
(Note 3)
(Note 3)
Time for output to stabilize
Peak-to-peak jitter, 16MHz (MAX7394)
Peak-to-peak jitter, 48MHz (MAX7394)
5
5
47
2
180
140
V
CC2
- 0.3
0.3
V
V
ns
ns
%
ms
ps
V
IH
V
IL
0.7
x V
CC2
0.3
x V
CC2
V
V
I
SHDN
Oscillator disabled,
CLKIN = high (MAX7393),
ENABLE = low (MAX7394) (Note 2)
1
2.4
2.4
3.6
3.6
4.4
5.4
5.8
6.5
9.2
9.5
12
2
µA
mA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Precision Silicon Oscillators with
Enable or Autoenable
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CC2
= +2.4V to +3.6V, C
L
= 10pF, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= V
CC2
= +3.3V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
FREQUENCY ACCURACY
Clock Frequency Coefficient of
Temperature
Clock Frequency Coefficient of
Supply Voltage
V
CC
= V
CC2
= 3.3V
T
A
= +25°C
TDFN
T
A
= 0°C to
(Note 4)
+85°C,
V
CC
= ±10% µDFN
(Note 5)
Total Accuracy
V
CC
= V
CC2
= 3.3V
T
A
= -40°C
to +125°C,
V
CC
= ±10% µDFN
(Note 5)
TDFN
(Note 4)
T
A
= 0°C to +70°C
T
A
= -40°C to +125°C
±20
±50
0.1
0.15
±0.25
±1.3
%
±1.0
±1.8
ppm/°C
%/V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX7393/MAX7394
Note 1:
All parameters are production tested at T
A
= +25°C. Specifications over temperature are guaranteed by design and
characterization.
Note 2:
The total supply current is the sum of I
CC
and I
CC2
.
Note 3:
Guaranteed by design and characterization. Not production tested.
Note 4:
Output frequency is production tested at T
A
= +25°C and T
A
= +85°C.
Note 5:
Output frequency is production tested at T
A
= +25°C.
_______________________________________________________________________________________
3
Precision Silicon Oscillators with
Enable or Autoenable
MAX7393/MAX7394
Typical Operating Characteristics
(V
CC
= V
CC2
= 3.3V, T
A
= +25°C, MAX7394, 48MHz output, unless otherwise noted.)
TOTAL SUPPLY CURRENT
vs. TEMPERATURE
MAX7393/4 toc01
DUTY CYCLE vs. TEMPERATURE
MAX7393/4 toc01
DUTY CYCLE vs. SUPPLY VOLTAGE
60
58
56
DUTY CYCLE (%)
54
52
50
48
46
44
42
40
10
9
TOTAL SUPPLY CURRENT (mA)
8
7
6
5
4
3
2
1
0
2.4
2.6
2.8
3.0
3.2
SUPPLY VOLTAGE (V)
3.4
3.6
58
56
DUTY CYCLE (%)
54
52
50
48
46
44
42
40
V
CC
= V
CC2
= +3.6V
V
CC
= V
CC2
= +3.3V
V
CC
= V
CC2
= +2.4V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX7393 toc04
NORMALIZED FREQUENCY
vs. SUPPLY VOLTAGE
MAX7393/4 toc05
NORMALIZED FREQUENCY
vs. TEMPERATURE
MAX7393/4 toc06
10
1.000
1.002
1.000
NORMALIZED FREQUENCY
TOTAL SUPPLY CURRENT (mA)
NORMALIZED FREQUENCY
8
0.999
0.998
0.996
0.994
0.992
0.990
6
0.998
4
0.997
2
0.996
0
2.4
2.6
2.8
3.0
3.2
SUPPLY VOLTAGE (V)
3.4
3.6
0.995
2.4
2.6
2.8
3.0
3.2
SUPPLY VOLTAGE (V)
3.4
3.6
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TOTAL SUPPLY CURRENT
vs. FREQUENCY
MAX7393 toc07
MAX7393 SETTLING TIME FROM START
MAX7393 toc08
9
8
TOTAL SUPPLY CURRENT (mA)
7
6
5
4
3
2
1
0
0
6
12
18 24 30 36
FREQUENCY (MHz)
42
V
CC
= V
CC2
= +2.4V
V
CC
= V
CC2
= +3.6V
V
CC
= V
CC2
= +3.3V
(SEE FIGURE 1)
20MHz
ON/OFF
2V/div
CLOCK
2V/div
48
400µs/div
4
_______________________________________________________________________________________
MAX7393/4 toc03
60
Precision Silicon Oscillators with
Enable or Autoenable
MAX7393/MAX7394
Typical Operating Characteristics (continued)
(V
CC
= V
CC2
= 3.3V, T
A
= +25°C, MAX7394, 48MHz output, unless otherwise noted.)
CLOCK OUTPUT WAVEFORM
WITH C
L
= 10pF
MAX7393 toc10
MAX7394 SETTLING TIME FROM START
MAX7393 toc09
ENABLE
2V/div
CLOCK
2V/div
CLOCK
1V/div
400µs/div
10ns/div
Pin Description
PIN
MAX7393
1
2
3
4
5
6
—
—
MAX7394
1
2
3
—
5
6
4
—
NAME
V
CC
GND
I.C.
CLKIN
CLOCK
V
CC2
ENABLE
EP
FUNCTION
Positive Supply Voltage Input. Bypass V
CC
to GND with 0.1µF capacitors placed as close to
the device as possible. Connect V
CC
to V
CC2
.
Ground
Internally Connected. Connect I.C. to GND. Do not connect I.C. to any other input or output.
Do not leave I.C. unconnected.
Clock Input. Connect CLKIN to a returned clock signal source (see the
Autoenable (CLKIN,
MAX7393)
section).
Clock Output. CLOCK is a rail-to-rail, push-pull output.
Positive Supply Voltage Input for Output Driver. Bypass V
CC2
to GND with a 0.1µF capacitor
placed as close to the device as possible. Connect V
CC2
to V
CC
.
Enable Input. Drive ENABLE low to place the MAX7394 in shutdown mode. Drive ENABLE
high for normal operation.
Exposed Paddle, TDFN Version Only. Connect EP to ground. Do not connect EP to any other
input or output.
_______________________________________________________________________________________
5
单片机
