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19-3896; Rev 1; 1/06
System Monitoring Oscillator with Watchdog and Power Fail
General Description
The MAX7387/MAX7388 replace ceramic resonators, crystals, and supervisory functions for microcontrollers in 3.3V and 5V applications. The MAX7387/MAX7388 provide a clock source together with integrated reset, watchdog, and power-fail functions. The watchdog timer is pin programmable and provides watchdog timeout values in the 16ms to 2048ms range. The power-fail output provides early warning of power failure. The power-fail threshold on the MAX7388 is internally set. The MAX7387 also provides a separate watchdog output that is used as a status indicator or to control safety-critical system elements. The MAX7387/MAX7388 clock outputs are factory programmed to a frequency in the 1MHz to 16MHz range. Four standard frequencies are available. Other frequencies are available upon request. The maximum operating supply current is 5.5mA (max) with a clock frequency of 12MHz. Unlike typical crystal and ceramic resonator oscillator circuits, the MAX7387/MAX7388 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 MAX7387/MAX7388 are available in 10-pin and 8-pin MAX(R) packages, respectively. The MAX7387/MAX7388 standard operating temperature range is from -40C to +125C.
Features
Robust Microcontroller Clock and Supervisor in a Single Package Integrated Reset, Watchdog, and Power-Fail Functions Pin-Programmable Watchdog Timeout +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 -40C to +125C 2.75% Total Accuracy for 0C to +85C -40C to +125C Temperature Range 8- and 10-Pin MAX Surface-Mount Packages 5.5mA Operating Current (12MHz) 1MHz to 16MHz Factory Preset Frequency
MAX7387/MAX7388
Ordering Information
PART TEMP RANGE PIN-PACKAGE PKG CODE U10-2 U8-1 MAX7387srff -40oC to +125oC 10 MAX MAX7388srff -40oC to +125oC 8 MAX
Applications
White Goods Automotive Appliances and Controls Handheld Products Portable Equipment Microcontroller Systems
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 nominal output frequency. Insert the symbol found in Table 4 in the place of "ff." For example, MAX7387CMTP 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.
MAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations
TOP VIEW
PFI 1 VCC WDS1 WDS2 GND 2 3 4 5 10 CLOCK 9 RST/RST WDI PFO WDO WDS2 3
TOP VIEW
VCC WDS1 1 2 8 7 CLOCK RST/RST WDI PFO
MAX7387
8 7 6
MAX7388
6 5 GND 4
MAX
MAX 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.
System Monitoring Oscillator with Watchdog and Power Fail MAX7387/MAX7388
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +6.0V All Other Pins to GND ................................-0.3V to (VCC + 0.3V) CLOCK, PFO Output Current, RST/RST, WDO.................50mA Continuous Power Dissipation (TA = +70C) 10-Pin MAX (derate 5.6mW/C over +70C) ..............444mW 8-Pin MAX (derate 4.5mW/C over +70C) ................362mW 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
(Typical Application Circuit, VCC = +2.7V to +5.5V, TA = -40C to +125C, 1MHz to 16MHz output frequency range, typical values at VCC = +5.0V, TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER POWER REQUIREMENTS Operating Supply Voltage Valid RST/RST Supply Voltage Operating Supply Current VCC VCCR ICC TA = 0C to +85C TA = -40C to +125C fCLOCK = 12MHz fCLOCK = 8MHz VCC - 0.55V 0.9 VCC - 1.1V 0.45 ILEAK VIH VIL VOH VOL VOLO VOHC VOLC fCLOCK ISOURCE = 1mA ISINK = 3mA ISINK = 3mA ISOURCE = 5mA ISINK = 5mA TA = 0C to +85C, VCC = 5.0V TA = -40C to +125C, VCC = 5.0V VCC = 5.0V (Note 2) TA = +25C (Note 2) (Note 2) 45 -2.75 -4 140 0.67 50 VCC - 0.3 0.3 +2.75 +4 400 1 55 VCC - 1.5 0.05 0.05 0.4 0.4 Input high 0.7 x VCC 0.3 x VCC 0.5 2.7 5.5 1.1 1.18 5.5 4.5 V V mA SYMBOL CONDITIONS MIN TYP MAX UNITS
TRI-LEVEL ANALOG INPUTS: WDS1, WDS2 Input-High Voltage Level Input-Middle Voltage Level Input-Low Voltage Level LOGIC INPUT: WDI Input Leakage Current Logic-Input High Voltage Logic-Input Low Voltage Output High Output Low Output Low OUTPUT: CLOCK Output High Voltage Output Low Voltage CLOCK Accuracy Clock Frequency Temperature Coefficient Clock Frequency Supply Voltage Coefficient CLOCK Duty Cycle V V % ppm/C %/V % A V V V V V V V V
PUSH-PULL LOGIC OUTPUTS: RST/RST
OPEN-DRAIN LOGIC OUTPUTS: RST, PFO, WDO
2
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System Monitoring Oscillator with Watchdog and Power Fail
ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, VCC = +2.7V to +5.5V, TA = -40C to +125C, 1MHz to 16MHz output frequency range, typical values at VCC = +5.0V, TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER CLOCK Output Jitter Output Rise Time Output Fall Time INTERNAL POWER-ON RESET TA = +25C VTH+ Reset Voltage VTHReset Timeout Period WATCHDOG WDS1 = GND, WDS2 = GND WDS1 = open, WDS2 = GND WDS1 = VCC, WDS2 = GND WDS1 = GND, WDS2 = open Watchdog Timeout Period (Figure 2) tWDG WDS1 = open, WDS2 = open WDS1 = VCC, WDS2 = open WDS1 = GND, WDS2 = VCC WDS1 = open, WDS2 = VCC WDS1 = WDS2 = VCC (watchdog disabled) POWER FAIL Power-Fail Select Threshold VCC Monitoring Threshold (Internal Threshold) Internal Threshold Hysteresis PFI Monitoring Threshold (External Threshold) External Threshold Hysteresis VSEL VITH VIHYST VETH VEHYST PFI input VCC rising VCC falling PFI rising PFI falling 0.65 x VCC 4.06 1.0 0.9 1.0 4.38 2 1.1 3.5 0.85 x VCC 4.60 4.0 1.4 8.0 V V %VITH V %VETH 11 22 44 88 177 354 708 1416 16 32 64 128 256 512 1024 2048 22 44 88 177 354 708 1416 2832 ms tRST VCC falling Figures 1, 2 86 VCC rising, Table 2 TA = -40C to +125C VTH - 1.5% VTH - 2.5% 0.98 x VTH+ 135 250 s VTH + 1.5% VTH + 2.5% V tR tF SYMBOL CONDITIONS Observation for 20s using a 500MHz oscilloscope CLOAD = 10pF, 10% to 90% of full scale (Note 2) CLOAD = 10pF, 90% to 10% of full scale (Note 2) MIN TYP 310 2.5 2.8 7.0 7.5 MAX UNITS ps
RMS
MAX7387/MAX7388
ns ns
Note 1: All parameters are tested at TA = +25C. Specifications over temperature are guaranteed by design. Note 2: Guaranteed by design. Not production tested.
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3
System Monitoring Oscillator with Watchdog and Power Fail MAX7387/MAX7388
Typical Operating Characteristics
(Typical Application Circuit, VCC = +5V, TA = +25C, unless otherwise noted.)
FREQUENCY vs. SUPPLY VOLTAGE
MAX7387/88 toc01
FREQUENCY vs. TEMPERATURE
MAX7387/88 toc02
DUTY CYCLE vs. SUPPLY VOLTAGE
MAX7387/88 toc03
1.020
1.040 1.030 NORMALIZED FREQUENCY 1.020 1.010 1.000 0.990 0.980 NORMALIZED TO TA = +25C
52
NORMALIZED FREQUENCY
1.010
51 DUTY CYCLE (%)
1.000
50
0.990 NORMALIZED TO VCC = +5V VTH+ = +2.9V 0.980 2.90 3.55 4.20 VCC (V) 4.85 5.50
49 VTH+ = +2.9V 48 2.90 3.55 4.20 VCC (V) 4.85 5.50
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
DUTY CYCLE vs. TEMPERATURE
MAX7387/88 toc04
CLOCK OUTPUT WAVEFORM WITH CL = 10pF
MAX7387/88 toc05
CLOCK OUTPUT WAVEFORM WITH CL = 50pF
MAX7387/88 toc06
52
VCC = +3.3V
VCC = +3.3V
51 DUTY CYCLE (%)
50
CLOCK 1V/div
CLOCK 1V/div
49
48 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 40ns/div 40ns/div
CLOCK OUTPUT WAVEFORM WITH CL = 100pF
MAX7387/88 toc07
SUPPLY CURRENT vs. TEMPERATURE
MAX7387/88 toc08
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX7387/88 toc09
5
5
4 ICC (mA) CLOCK 1V/div
VCC = 5V
4 ICC (mA)
3 VCC = 3.3V 2
3
2 VTH+ = 2.9V
1 40ns/div -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
1 2.90 3.55 4.20 VCC (V) 4.85 5.50
4
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System Monitoring Oscillator with Watchdog and Power Fail MAX7387/MAX7388
Typical Operating Characteristics (continued)
(Typical Application Circuit, VCC = +5V, TA = +25C, unless otherwise noted.)
CLOCK SETTLING TIME FROM START
MAX7387/88 toc10
POWER-ON RESET BEHAVIOR
MAX7387/88 toc11
MAXIMUM VCC TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE
MAX7387/88 toc12
1000 VCC 2V/div
VCC 2V/div
TRANSIENT DURATION (s)
RESET OCCURS ABOVE THIS CURVE 100
CLOCK 2V/div
CLOCK 5V/div tRST RST 5V/div PFI = VCC PFO 5V/div
10
VCC FALLING FROM VTH+ + 100mV 1 100 200 300 400 500 600 700 800 900 1000 RESET THRESHOLD OVERDRIVE (mV)
1s/div
100s/div
RESPONSE OF RST AND WDO WDI EXCEEDING tWDG
RISING THRESHOLD vs. TEMPERATURE
MAX7387/88 toc14
MAX7387/88 toc13
2.90 WDI 2V/div
2.88
tWDG
VTH+ (V)
WDO 5V/div RST 5V/div tRST
2.86
2.84
2.82
2.80 2ms/div -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
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5
System Monitoring Oscillator with Watchdog and Power Fail MAX7387/MAX7388
Pin Description
PIN MAX7387 1 2 3 4 5 6 7 MAX7388 1 2 3 4 5 NAME PFI VCC WDS1 WDS2 GND WDO PFO FUNCTION Power-Fail Input. PFI monitors the condition of either an external supplied voltage or VCC. See the Power Fail section for more details. Power Input. Connect VCC to the power supply. Bypass VCC to GND with a 1F capacitor. Install the bypass capacitor as close to the device as possible. Watchdog Timeout Select Input 1. Connect WDS1 and WDS2 to VCC, GND, or VCC/2, as shown in Table 1, to set the watchdog timeout period. Watchdog Timeout Select Input 2. Connect WDS2 and WDS1 to VCC, GND, or VCC/2, as shown in Table 1, to set the watchdog timeout period. Ground Watchdog Output. Open-drain watchdog output asserts low if WDI is not toggled within the watchdog timeout period. Power-Fail Output. Open-drain output asserts when the voltage being monitored drops below the power-fail threshold voltage. Watchdog Input. A rising edge on WDI resets the watchdog timer. If WDI does not receive a rising edge within the watchdog timeout period (tWDG), RST/RST asserts. The watchdog timeout period is programmable through WDS1 and WDS2. Connect WDS1 and WDS2 to VCC to disable watchdog timer. Reset Output. Reset output is available in one of three configurations: push-pull RST, push-pull RST, or open-drain RST. The reset output occurs if any combination of the following conditions occurs: reset output is asserted during power-up and whenever VCC is below the reset threshold level; for devices with WDI, reset output asserts when WDI does not receive a rising edge within the watchdog timeout period. Clock Output
8
6
WDI
9
7
RST/RST
10
8
CLOCK
Detailed Description
The MAX7387/MAX7388 replace ceramic resonators, crystals, and supervisory functions for microcontrollers in 3.3V and 5V applications. The MAX7387/MAX7388 provide a clock source together with integrated reset, watchdog, and power-fail functions. The watchdog timer is pin programmable and provides watchdog timeout values in the 16ms to 2048ms range. The power-fail output provides early warning of power failure. The power-fail threshold on the MAX7388 is internally set. The MAX7387 features a programmable power-fail threshold, which is configurable to detect either an external voltage or the VCC supply voltage to the device. The MAX7387 also provides a separate watchdog output that is used as a status indicator or to control safety-critical system elements.
The integrated reset and watchdog functions provide the power-supply monitoring functions necessary to ensure correct microcontroller operation. The reset circuit has built-in power-supply transient immunity and provides both power-on reset and power-fail or brownout reset functionality. Two standard factorytrimmed reset levels are available. The watchdog timer is programmable to eight individual timeout values and may be disabled for test purposes. A power-fail function is provided for power-supply voltage monitoring and can provide advance notice of an impending power failure. Parts with power-fail input (MAX7387) monitor external power-supply voltages through an external resistive divider. Connect PFI to VCC to monitor VCC.
6
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System Monitoring Oscillator with Watchdog and Power Fail
Clock Output (CLOCK)
The push-pull clock output (CLOCK) drives a groundconnected 1k load or a positive supply connected 500 load to within 300mV of either supply rail. CLOCK 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 section. Upon completion of the reset timeout, the reset output is released. See Figure 1. Low-Voltage Lockout The reset output asserts whenever VCC drops below the reset falling threshold, VTH-. The difference between the reset rising and falling threshold values is VTH+ - (VTH-). The nominal hysteresis value is 2% of the reset rising threshold value. The reset detection circuitry provides filtering to prevent triggering on negative voltage spikes. See the Maximum VCC Transient Duration vs. Reset Threshold Overdrive typical operating circuit. Figure 1 shows the reset output (RST/RST) behavior during power-up and brownout.
MAX7387/MAX7388
Reset
The reset function drives the microcontroller reset input to prevent operation in the cases of the initial power-on setting, low power-supply voltages, and the failed watchdog operations. Three reset output versions are available: push-pull RST, push-pull RST, and open-drain RST. The reset timeout period (tRST) is nominally 135s. Power-On Reset (POR) The internal power-on reset (POR) circuit detects the power-supply voltage (VCC) level at startup. The POR circuit starts the oscillator when VCC exceeds the reset rising threshold level (VTH+). The reset output remains asserted from the time VCC crosses the VTH+ and continues to be asserted for the reset timeout period (tRST).
5 4 VITH VTH+
Watchdog
The watchdog function provides microprocessor monitoring by requiring the microprocessor to toggle an output pin to indicate correct operation. The WDI input monitors the port signal and resets the watchdog timer on receipt of a rising edge. If an edge is not received within the required watchdog timeout period, the watchdog circuit initiates a reset cycle. The internal watchdog
VITH - VIHYST VTH-
VCC (V)
3 2 1
VCCR
CLK
RST
tRST
PFO CLOCK STARTS ON INTERNAL POR (VTH+, VCC RISING) RST RELEASES AFTER THE RESET TIMEOUT PERIOD PFO ASSERTS AS VCC DROPS BELOW VITH - VIHYST RST ASSERTS ON RESET FALLING VOLTAGE (VTH-, VCC FALLING); CLOCK STOPS RST CONTINUES TO ASSERT UNTIL VCCR
Figure 1. RST/RST and PFO Behavior During Power-Up and Brownout _______________________________________________________________________________________ 7
System Monitoring Oscillator with Watchdog and Power Fail MAX7387/MAX7388
circuits are reset and the watchdog timer restarts at the end of the reset cycle (RST/RST output releases). For the MAX7387, the WDO output asserts if the WDI input does not receive a rising edge within the watchdog timeout period. WDO output remains asserted until a valid edge is received on the WDI input, signifying correct microprocessor operation. The WDO output can be used as a status indicator either to the microprocessor or to an external device, such as a fault-indicating LED or sounder. The WDO output is an open-drain output. The power-up condition of the WDO output is high (not asserted). The operation of the watchdog and reset function is illustrated in Figure 2. The watchdog timeout period is set to one of nine possible values by pin strapping WDS1 and WDS2. Each control input has three possible values assigned by connection to GND, V CC , or V CC /2 (see Table 1). One of the assigned values disables the watchdog function and is intended for customer use during test. The watchdog timer is disabled while the RST/RST output is asserted. MAX7387 Power Fail Internal (VCC) detection is configured by connecting PFI to VCC. The internal VCC rising threshold (VITH) is set at 4.38V. The open-drain PFO asserts low if the VCC supply voltage drops below the VCC falling threshold value (VHYST). The VCC falling threshold is nominally 2% below the VCC rising threshold.
Applications Information
Interfacing to a Microcontroller Clock Input
The CLOCK output is a push-pull, CMOS logic output, which directly drives any microprocessor (P) or microcontroller (C) clock input. There are no impedance-
Table 1. Watchdog Timeout Periods
WDS1 GND VCC/2 = open VCC GND VCC/2 = open VCC GND VCC/2 = open VCC WDS2 GND GND GND VCC/2 = open VCC/2 = open VCC/2 = open VCC VCC VCC WATCHDOG TIMEOUT PERIOD (ms) MIN 11 22 44 88 177 354 708 1416 TYP 16 32 64 128 256 512 1024 2048 Disabled MAX 22 44 88 177 354 708 1416 2832
Power Fail
MAX7388 Power Fail The power-fail function provides early warning of a power failure. The power-fail comparator threshold is internally set to 4.38V VCC rising threshold (VITH). The open-drain PFO asserts low if the VCC supply voltage drops below the VCC falling threshold value. The VCC falling threshold is nominally 2% below the VCC rising threshold.
Note: WDS1 or WDS2 is pulled to open if left floating.
VCC CLK RST INTERNAL WATCHDOG STATE WDI ACTIVE TRIPPED RESET TIMEOUT PERIOD (tRST)
WDO WATCHDOG TIMEOUT PERIOD (tWDG)
Figure 2. Watchdog Timing Diagram 8 _______________________________________________________________________________________
System Monitoring Oscillator with Watchdog and Power Fail
matching issues when using the MAX7387/MAX7388. Operate the MAX7387/MAX7388 and microcontroller (or other clock input device) from the same supply voltage level. Refer to the microcontroller data sheet for clock-input compatibility with external clock signals. The MAX7387/MAX7388 require no biasing components or load capacitance. When using the MAX7387/ MAX7388 to retrofit a crystal oscillator, remove all biasing components from the oscillator input. load. Use a bypass capacitor value of at least 1000 times that of the output load capacitance.
MAX7387/MAX7388
Output Jitter
The MAX7387/MAX7388s' jitter performance is given in the Electrical Characteristics table as a peak-to-peak value obtained by observing the output of the device for 20s with a 500MHz oscilloscope. Jitter measurements 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 all clock sources degrades in the presence of mechanical and electrical interference. The MAX7387/MAX7388 are immune to vibration, shock, and EMI influences, and thus provide a considerably more robust clock source than crystal- or ceramic-resonator-based oscillator circuits.
Power-Supply Consideration
The MAX7387/MAX7388 operate with power-supply voltages in the 2.7V to 5.5V range. Power-supply decoupling is needed to maintain the power-supply rejection performance of the MAX7387/MAX7388. Bypass VCC to GND with a 0.1F surface-mount ceramic capacitor. Mount the bypass capacitor as close to the device as possible. If possible, mount the MAX7387 /MAX7388 close to the microcontroller's decoupling capacitor so that additional decoupling is not required. A larger-value bypass capacitor is recommended if the MAX7387/MAX7388 are to operate with a large capacitive
Table 3. Reset Output Type
OUTPUT TYPE Push-pull RST Push-pull RST Open-drain RST s A B C
Table 2. POR Voltage
POWER-ON RESET VOLTAGE (VTH) 4.38 3.96 3.44 3.34 3.13 2.89 2.82 2.5 r M J N P Q S V X
Note: Standard values are shown in bold. Contact factory for other output types.
Table 4. Clock Output Frequency
CLOCK FREQUENCY (fCLOCK) (MHz) 4 8 12 16 Note: Contact factory for other frequencies. ff RD TP VB WB
Note: Standard values are shown in bold. Contact factory for other POR voltages.
Selector Guide
PART MAX7387 MAX7388 MAX7389 MAX7390 MAX7391 FREQUENCY RANGE (MHz) 1 to 16 1 to 16 1 to 16 1 to 16 1 to 16 RESET FUNCTION Yes Yes Yes Yes Yes WATCHDOG INPUT (WDI)/ WATCHDOG OUTPUT (WDO) Yes/yes Yes/no Yes/yes Yes/no -- POWER-FAIL INPUT (PFI)/ PINSPEED POWER-FAIL OUTPUT (PFO) PACKAGE Yes/yes No/yes -- -- Yes/yes -- -- -- Yes Yes 10 MAX 8 MAX 8 MAX 8 MAX 8 MAX
Note: Other versions with different features are available. Refer to the MAX7389/MAX7390 and MAX7391 data sheets.
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9
System Monitoring Oscillator with Watchdog and Power Fail MAX7387/MAX7388
Functional Diagram
RST/RST
MAX7387 MAX7388
PRESCALER POWER-ON RESET OSCILLATOR RESET TIMER
CLOCK WDO*
WDI WDS1 WDS2 PFI*
WATCHDOG TIMER
N
PFO INTERNAL (VCC DETECTION) V_TH *MAX7387 ONLY GND
N
Typical Application Circuit
POWER SUPPLY DC-DC 5V
WDS1 R1 WDS2 PFI*
VCC
RST/RST PFO
RST/RST INT I/O PORT I/O PORT OSC1 C
MAX7387 MAX7388
WDI WDO*
R2 CLOCK GND
*MAX7387 ONLY
Chip Information
PROCESS: BICMOS
10 ______________________________________________________________________________________
System Monitoring Oscillator with Watchdog and Power Fail
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.)
8LUMAXD.EPS
MAX7387/MAX7388
4X S
8
8
INCHES DIM A A1 A2 b MIN 0.002 0.030 MAX 0.043 0.006 0.037
MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95
O0.500.1
E
H
0.60.1
c D e E H L
1
1
0.60.1
S
D
BOTTOM VIEW
0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6 0 0.0207 BSC
0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC
TOP VIEW
A2
A1
A
c e b L
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0036
1 1
J
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11
System Monitoring Oscillator with Watchdog and Power Fail MAX7387/MAX7388
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.)
e
10
4X S
10
INCHES MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 0.120 D1 0.116 0.118 0.114 D2 0.116 0.120 E1 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S 0 6
MILLIMETERS MAX MIN 1.10 0.15 0.05 0.75 0.95 3.05 2.95 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.270 0.500 BSC 0.090 0.200 0.498 REF 0 6
H
O0.500.1
0.60.1
1
1
0.60.1
TOP VIEW
BOTTOM VIEW
D2 GAGE PLANE A2 A b A1 D1
E2
c
E1 L1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0061
1 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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
10LUMAX.EPS

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