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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 supply voltage range. The MAX7393/MAX7394 consist of a temperature-compensated precision oscillator with enable (MAX7394) or autoenable (MAX7393). The MAX7393/MAX7394 are supplied at specific frequencies, just like crystals and resonators. Output frequency accuracy is guaranteed to be within 0.25% (TDFN) and 1.3% (DFN) (0C to +85C) and 1.0% (TDFN) and 1.8% (DFN) over the -40C to +125C temperature range. The small size and robust operation of the MAX7393/ MAX7394 make them ideal for space-constrained or environmentally demanding applications where high accuracy 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 DFN packages. They are specified for the -40C to +125C temperature range.
Features
0.25% (TDFN) and 1.3% (DFN) Total Accuracy for 0C to +85C 1.0% (TDFN) and 1.8% (DFN) Total Accuracy for -40C to +125C 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 DFN Surface-Mount Packages
MAX7393/MAX7394
Applications
USB CAN Nodes Automotive Systems Computers Handheld Products White Goods
PART* MAX7393ALT_ _+ MAX7393ATT_ _+ MAX7394ALT_ _+ MAX7394ATT_ _+
6 1 VCC2 VCC CLOCK 5 OSC1 C
Ordering Information
TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 6 DFN 6 TDFN 6 DFN 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 VCC2 VCC CLOCK 5 OSC1 C
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
VCC, VCC2 to GND.................................................-0.3V to +4.0V CLOCK, CLKIN, ENABLE, I.C. to GND ......-0.3V to (VCC + 0.3V) CLOCK Output Current ....................................................50mA Continuous Power Dissipation (TA = +70C) 6-Pin DFN (derate 4.5mW/C over +70C) ................358mW 6-Pin TDFN (derate 18.2mW/C over +70C) ............1455mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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
(VCC = VCC2 = +2.4V to +3.6V, CL = 10pF, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = VCC2 = +3.3V, TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER DC CHARACTERISTICS Operating Supply Voltage Operating Output Supply Voltage VCC VCC2 922kHz, MAX739_ _ _ _LY 4MHz, MAX739_ _ _ _RD 8MHz, MAX739_ _ _ _TP Total Operating Supply Current (Note 2) ITOT 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) VOH VOL tR tF VCC2 2.4V, ISOURCE = 5mA VCC2 2.4V, ISINK = 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 VCC2 - 0.3 0.3 V V ns ns % ms ps VIH VIL 0.7 x VCC2 0.3 x VCC2 V V ISHDN 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 A mA V V SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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Precision Silicon Oscillators with Enable or Autoenable
ELECTRICAL CHARACTERISTICS (continued)
(VCC = VCC2 = +2.4V to +3.6V, CL = 10pF, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = VCC2 = +3.3V, TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER FREQUENCY ACCURACY Clock Frequency Coefficient of Temperature Clock Frequency Coefficient of Supply Voltage VCC = VCC2 = 3.3V TA = +25C TDFN TA = 0C to (Note 4) +85C, VCC = 10% DFN (Note 5) Total Accuracy VCC = VCC2 = 3.3V TA = -40C to +125C, VCC = 10% DFN (Note 5) TDFN (Note 4) TA = 0C to +70C TA = -40C to +125C 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 TA = +25C. Specifications over temperature are guaranteed by design and characterization. Note 2: The total supply current is the sum of ICC and ICC2. Note 3: Guaranteed by design and characterization. Not production tested. Note 4: Output frequency is production tested at TA = +25C and TA = +85C. Note 5: Output frequency is production tested at TA = +25C.
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3
Precision Silicon Oscillators with Enable or Autoenable MAX7393/MAX7394
Typical Operating Characteristics
(VCC = VCC2 = 3.3V, TA = +25C, 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
VCC = VCC2 = +3.6V
VCC = VCC2 = +3.3V
VCC = VCC2 = +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 VCC = VCC2 = +2.4V VCC = VCC2 = +3.6V VCC = VCC2 = +3.3V
(SEE FIGURE 1) 20MHz ON/OFF 2V/div
CLOCK 2V/div
48
400s/div
4
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MAX7393/4 toc03
60
Precision Silicon Oscillators with Enable or Autoenable MAX7393/MAX7394
Typical Operating Characteristics (continued)
(VCC = VCC2 = 3.3V, TA = +25C, MAX7394, 48MHz output, unless otherwise noted.)
CLOCK OUTPUT WAVEFORM WITH CL = 10pF
MAX7393 toc10
MAX7394 SETTLING TIME FROM START
MAX7393 toc09
ENABLE 2V/div
CLOCK 2V/div
CLOCK 1V/div
400s/div
10ns/div
Pin Description
PIN MAX7393 1 2 3 4 5 6 -- -- MAX7394 1 2 3 -- 5 6 4 -- NAME VCC GND I.C. CLKIN CLOCK VCC2 ENABLE EP FUNCTION Positive Supply Voltage Input. Bypass VCC to GND with 0.1F capacitors placed as close to the device as possible. Connect VCC to VCC2. 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 VCC2 to GND with a 0.1F capacitor placed as close to the device as possible. Connect VCC2 to VCC. 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.
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5
Precision Silicon Oscillators with Enable or Autoenable MAX7393/MAX7394
Detailed 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 supply voltage range. The MAX7393/MAX7394 consist of a temperature-compensated precision oscillator with enable (MAX7394) or autoenable (MAX7393). The ENABLE input on the MAX7394 manually enables or disables the oscillator. The CLKIN input on the MAX7393 monitors a returned clock signal to automatically enable or disable the MAX7393 oscillator. The MAX7393/MAX7394 are supplied at specific frequencies, like crystals and resonators. A variety of popular standard frequencies are available (see the Selector Guide). Output frequency accuracy is guaranteed to be within 0.25% (TDFN) and 1.3% (DFN) (0C to +85C) and 1.0% (TDFN) and 1.8% (DFN) over the -40C to +125C temperature range. No external components are required to generate the specific frequency.
CLOCK ON/OFF CLKIN
MAX7393
Figure 1. Test Circuit to Enable or Disable the MAX7393 Oscillator
Oscillator (CLOCK)
The CLOCK output is a push-pull, CMOS logic output that is capable of driving a ground-connected 1k load or a positive supply connected 500 load to within 300mV of either supply rail. There are no impedancematching issues when using the MAX7393/MAX7394 CLOCK output. A typical startup characteristic is shown in the Typical Operating Characteristics.
Output Jitter
The MAX7393/MAX7394s' jitter performance is given in the Electrical Characteristics table as a peak-to-peak value.
ENABLE (MAX7394)
The ENABLE input on the MAX7394 turns the oscillator on and off. Drive ENABLE to a logic-high for normal operation. Drive ENABLE to a logic-low to place the device in shutdown mode. During shutdown, the oscillator is turned off, and the CLOCK output is weakly driven high with an internal 10k to VCC2. In shutdown mode, the total supply current reduces to less than 2A.
Applications Information
Interfacing to a Microcontroller Clock Input
The MAX7393/MAX7394 CLOCK output is a push-pull, CMOS logic output that directly drives any microprocessor (P) or microcontroller (C) clock input. There are no impedance-matching issues when using the MAX7393/MAX7394. Operate the MAX7393/MAX7394 and microcontroller from the same supply voltage level of VCC2 (see the Power-Supply Considerations section for more details). Refer to the microcontroller's data sheet for clock input compatibility with external clock signals. The MAX7393/MAX7394 require no biasing components or load capacitance. When using the MAX7393/ MAX7394 to retrofit a crystal oscillator, remove all biasing components from the oscillator input.
Autoenable (CLKIN, MAX7393)
The MAX7393 features a CLKIN input that automatically enables or disables the oscillator by sensing the condition of a returned clock signal. The MAX7393 is automatically enabled whenever an active inversion function is sensed between CLOCK and CLKIN. When no inversion function is detected, the MAX7393 automatically enters shutdown mode. During shutdown, the oscillator is turned off, the CLKIN input is weakly driven to its last state, and the CLOCK output is weakly driven to the logic-level in CLKIN. The CLKIN input relies on an external inversion function, typically provided by a microcontroller's clock generator, to provide an inverted version of the CLOCK output signal. The MAX7393 interprets high/low voltage or a constant high-impedance node on CLKIN as a disable signal. Figure 1 shows a test circuit to enable or disable the MAX7393. One input of the NAND gate connects to the CLOCK output of the MAX7393, and the other input is driven with a logic level. A logic-high level enables the oscillator and a logic-low level disables the oscillator. See the Typical Operating Characteristics for typical startup performance of the MAX7393.
6
Power-Supply Considerations
The MAX7393/MAX7394 operate with power-supply voltages in the +2.4V to +3.6V range. Connect VCC and VCC2 to the same supply voltage level as the device receiving the clock. Proper power-supply decoupling is required to maintain the power-supply rejection performance of the MAX7393/MAX7394. Connect 0.1F surface-mount ceramic capacitors from VCC to VCC2 to GND. Position these bypass capacitors as close to VCC and VCC2 as possible. A larger VCC2 bypass capacitor value is recommended if the MAX7393/MAX7394 are to operate with a large capacitive load. Use a bypass capacitor value on VCC2 at least 1000 times that of the output load capacitance.
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Precision Silicon Oscillators with Enable or Autoenable
Pin Configurations
PART
TOP VIEW OF BOTTOM LEADS
VCC2 6 CLOCK 5 CLKIN 4
Selector Guide
FREQUENCY 922kHz 922kHz 1MHz 1MHz 4MHz 4MHz 8MHz 8MHz 16MHz 16MHz 20MHz 20MHz 922kHz 922kHz 1MHz 1MHz 4MHz 4MHz 8MHz 8MHz 16MHz 16MHz 20MHz 20MHz 32MHz 32MHz 33MHz 33MHz 40MHz 40MHz 48MHz 48MHz PACKAGE 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN 6 TDFN 6 DFN TOP MARK +ANP +ABO +ANQ +ABP +ANR +ABQ +ANS +ABR +AMN +AAR +AMO +AAS +ANV +ABU +ANW +ABV +ANX +ABW +ANY +ABX +AMU +AAY +AMV +AAZ +ANZ +ABY +AMX +ABB +AOA +ABZ +AMZ +ABD MAX7393ATTLY MAX7393ALTLY MAX7393ATTMG MAX7393ALTMG MAX7393ATTRD
MAX7393/MAX7394
MAX7393
1 2 GND 3 I.C.
+
MAX7393ALTRD MAX7393ATTTP MAX7393ALTTP MAX7393ATTWB MAX7393ALTWB MAX7393ATTWV MAX7393ALTWV MAX7394ATTLY MAX7394ALTLY MAX7394ATTMG MAX7394ALTMG MAX7394ATTRD
VCC
DFN
VCC2 6 *EP CLOCK 5 CLKIN 4
MAX7393
+
1 VCC 2 GND 3 I.C.
MAX7394ALTRD MAX7394ATTTP MAX7394ALTTP MAX7394ATTWB MAX7394ALTWB MAX7394ATTWV MAX7394ALTWV MAX7394ATTYN MAX7394ALTYN
TDFN
*EXPOSED PADDLE. CONNECT EP TO GROUND.
VCC2 6
CLOCK 5
ENABLE 4
MAX7394
1 2 GND 3 I.C.
+
MAX7394ATTYQ MAX7394ALTYQ MAX7394ATTZH MAX7394ALTZH MAX7394ATTZY MAX7394ALTZY
VCC
DFN
VCC2 6 *EP CLOCK ENABLE 5 4
MAX7394
Chip Information
PROCESS: BiCMOS
+
1 VCC 2 GND 3 I.C.
TDFN
*EXPOSED PADDLE. CONNECT EP TO GROUND.
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7
Precision Silicon Oscillators with Enable or Autoenable MAX7393/MAX7394
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.)
6, 8, &10L, DFN THIN.EPS
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
H
1
2
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
PACKAGE VARIATIONS PKG. CODE T633-1 T633-2 T833-1 T833-2 T833-3 T1033-1 T1033-2 T1433-1 T1433-2 N 6 6 8 8 8 10 10 14 14 D2 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.700.10 1.700.10 E2 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 e 0.95 BSC 0.95 BSC 0.65 BSC 0.65 BSC 0.65 BSC 0.50 BSC 0.50 BSC 0.40 BSC 0.40 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEA MO229 / WEEC MO229 / WEEC MO229 / WEEC MO229 / WEED-3 MO229 / WEED-3 ------b 0.400.05 0.400.05 0.300.05 0.300.05 0.300.05 0.250.05 0.250.05 0.200.05 0.200.05 [(N/2)-1] x e 1.90 REF 1.90 REF 1.95 REF 1.95 REF 1.95 REF 2.00 REF 2.00 REF 2.40 REF 2.40 REF
0.25 MIN. 0.20 REF.
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
21-0137
H
2
2
8
_______________________________________________________________________________________
Precision Silicon Oscillators with Enable or Autoenable
Package Information (continued)
(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.)
6, 8, 10L UDFN.EPS
MAX7393/MAX7394
D
A
e
b
N
XXXX XXXX XXXX
SOLDER MASK COVERAGE
E
PIN 1 0.10x45
L
PIN 1 INDEX AREA SAMPLE MARKING 7 1 A A
L1
(N/2 -1) x e)
C L
C L
b A A2 A1
L e
EVEN TERMINAL
L e
ODD TERMINAL
PACKAGE OUTLINE, 6, 8, 10L uDFN, 2x2x0.80 mm
-DRAWING NOT TO SCALE-
21-0164
A
1
2
COMMON DIMENSIONS SYMBOL A A1 A2 D E L L1 MIN. 0.70 0.15 0.020 1.95 1.95 0.30 NOM. 0.75 0.20 0.025 2.00 2.00 0.40 0.10 REF. MAX. 0.80 0.25 0.035 2.05 2.05 0.50
PACKAGE VARIATIONS PKG. CODE L622-1 L822-1 L1022-1 N 6 8 10 e 0.65 BSC 0.50 BSC 0.40 BSC b 0.300.05 0.250.05 0.200.03 (N/2 -1) x e 1.30 REF. 1.50 REF. 1.60 REF.
PACKAGE OUTLINE, 6, 8, 10L uDFN, 2x2x0.80 mm
-DRAWING NOT TO SCALE-
21-0164
A
2
2
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 (c) 2006 Maxim Integrated Products
Springer
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.

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