19-3896; Rev 1; 1/06 System Monitoring Oscillator with Watchdog and Power Fail Features 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. ♦ Robust Microcontroller Clock and Supervisor in a Single Package 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 µMAX® packages, respectively. The MAX7387/MAX7388 standard operating temperature range is from -40°C to +125°C. ♦ 5.5mA Operating Current (12MHz) Applications White Goods Handheld Products Automotive Portable Equipment Appliances and Controls Microcontroller Systems µMAX is a registered trademark of Maxim Integrated Products, Inc. ♦ 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 -40°C to +125°C ♦ ±2.75% Total Accuracy for 0°C to +85°C ♦ -40°C to +125°C Temperature Range ♦ 8- and 10-Pin µMAX Surface-Mount Packages ♦ 1MHz to 16MHz Factory Preset Frequency Ordering Information PART TEMP RANGE PIN-PACKAGE PKG CODE MAX7387srff -40oC to +125oC 10 µMAX U10-2 MAX7388srff -40oC to +125oC 8 µMAX U8-1 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. Pin Configurations TOP VIEW TOP VIEW PFI 1 10 CLOCK VCC 2 9 RST/RST WDS1 3 8 WDI WDS2 4 7 PFO GND 5 6 WDO MAX7387 µMAX VCC 1 8 CLOCK WDS1 2 7 RST/RST 3 6 WDI GND 4 5 PFO MAX7388 WDS2 µMAX ________________________________________________________________ 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. 1 MAX7387/MAX7388 General Description MAX7387/MAX7388 System Monitoring Oscillator with Watchdog and Power Fail 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 = +70°C) 10-Pin µMAX (derate 5.6mW/°C over +70°C) ..............444mW 8-Pin µMAX (derate 4.5mW/°C over +70°C) ................362mW 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 (Typical Application Circuit, VCC = +2.7V to +5.5V, TA = -40°C to +125°C, 1MHz to 16MHz output frequency range, typical values at VCC = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V POWER REQUIREMENTS Operating Supply Voltage Valid RST/RST Supply Voltage Operating Supply Current VCC VCCR ICC 2.7 TA = 0°C to +85°C 1.1 TA = -40°C to +125°C 1.18 fCLOCK = 12MHz 5.5 fCLOCK = 8MHz 4.5 V mA TRI-LEVEL ANALOG INPUTS: WDS1, WDS2 Input-High Voltage Level VCC - 0.55V Input-Middle Voltage Level V 0.9 VCC - 1.1V Input-Low Voltage Level V 0.45 V 0.5 µA LOGIC INPUT: WDI Input Leakage Current ILEAK Logic-Input High Voltage VIH Logic-Input Low Voltage VIL Input high 0.7 x VCC V 0.3 x VCC V PUSH-PULL LOGIC OUTPUTS: RST/RST Output High VOH ISOURCE = 1mA Output Low VOL ISINK = 3mA VCC - 1.5 V 0.05 0.4 V 0.05 0.4 V 0.3 V OPEN-DRAIN LOGIC OUTPUTS: RST, PFO, WDO Output Low VOLO ISINK = 3mA Output High Voltage VOHC ISOURCE = 5mA Output Low Voltage VOLC ISINK = 5mA OUTPUT: CLOCK CLOCK Accuracy fCLOCK TA = 0°C to +85°C, VCC = 5.0V TA = -40°C to +125°C, VCC = 5.0V VCC - 0.3 V -2.75 +2.75 -4 +4 % Clock Frequency Temperature Coefficient VCC = 5.0V (Note 2) 140 400 ppm/°C Clock Frequency Supply Voltage Coefficient TA = +25°C (Note 2) 0.67 1 %/V CLOCK Duty Cycle (Note 2) 50 55 % 2 45 _______________________________________________________________________________________ System Monitoring Oscillator with Watchdog and Power Fail (Typical Application Circuit, VCC = +2.7V to +5.5V, TA = -40°C to +125°C, 1MHz to 16MHz output frequency range, typical values at VCC = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS Output Rise Time tR Observation for 20s using a 500MHz oscilloscope CLOAD = 10pF, 10% to 90% of full scale (Note 2) Output Fall Time tF CLOAD = 10pF, 90% to 10% of full scale (Note 2) CLOCK Output Jitter MIN TYP MAX UNITS ps 310 RMS 2.5 7.0 ns 2.8 7.5 ns INTERNAL POWER-ON RESET VTH+ VTH - 1.5% VTH + 1.5% TA = -40°C to +125°C VTH - 2.5% VTH + 2.5% V µs VCC rising, Table 2 Reset Voltage Reset Timeout Period TA = +25°C 0.98 x VTH+ VTH- VCC falling tRST Figures 1, 2 86 135 250 WDS1 = GND, WDS2 = GND 11 16 22 WDS1 = open, WDS2 = GND 22 32 44 WDS1 = VCC, WDS2 = GND 44 64 88 WDS1 = GND, WDS2 = open 88 128 177 WDS1 = open, WDS2 = open 177 256 354 WDS1 = VCC, WDS2 = open 354 512 708 WDS1 = GND, WDS2 = VCC 708 1024 1416 WDS1 = open, WDS2 = VCC 1416 2048 2832 WATCHDOG Watchdog Timeout Period (Figure 2) tWDG ms WDS1 = WDS2 = VCC (watchdog disabled) POWER FAIL 0.65 x VCC 0.85 x VCC V 4.38 4.60 V 1.0 2 4.0 %VITH PFI rising 0.9 1.1 1.4 V PFI falling 1.0 3.5 8.0 %VETH Power-Fail Select Threshold VSEL PFI input VCC Monitoring Threshold (Internal Threshold) VITH VCC rising 4.06 VIHYST VCC falling VETH VEHYST Internal Threshold Hysteresis PFI Monitoring Threshold (External Threshold) External Threshold Hysteresis Note 1: All parameters are tested at TA = +25°C. Specifications over temperature are guaranteed by design. Note 2: Guaranteed by design. Not production tested. _______________________________________________________________________________________ 3 MAX7387/MAX7388 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (Typical Application Circuit, VCC = +5V, TA = +25°C, unless otherwise noted.) FREQUENCY vs. TEMPERATURE 0.990 MAX7387/88 toc02 1.020 0.980 1.010 1.000 4.20 4.85 50 49 5.50 VTH+ = +2.9V NORMALIZED TO TA = +25°C 0.980 3.55 51 0.990 NORMALIZED TO VCC = +5V VTH+ = +2.9V 2.90 DUTY CYCLE vs. SUPPLY VOLTAGE 52 DUTY CYCLE (%) 1.000 1.030 NORMALIZED FREQUENCY MAX7387/88 toc01 NORMALIZED FREQUENCY 1.010 1.040 MAX7387/88 toc03 FREQUENCY vs. SUPPLY VOLTAGE 1.020 48 -40 -25 -10 5 20 35 50 65 80 95 110 125 2.90 3.55 4.20 TEMPERATURE (°C) VCC (V) DUTY CYCLE vs. TEMPERATURE CLOCK OUTPUT WAVEFORM WITH CL = 10pF CLOCK OUTPUT WAVEFORM WITH CL = 50pF MAX7387/88 toc05 MAX7387/88 toc04 51 5.50 4.85 VCC (V) 52 DUTY CYCLE (%) MAX7387/88 toc06 VCC = +3.3V VCC = +3.3V CLOCK 1V/div 50 CLOCK 1V/div 49 48 40ns/div -40 -25 -10 5 20 35 50 65 80 95 110 125 40ns/div TEMPERATURE (°C) SUPPLY CURRENT vs. TEMPERATURE 4 CLOCK 1V/div SUPPLY CURRENT vs. SUPPLY VOLTAGE 5 MAX7387/88 toc08 5 VCC = 5V 3 VCC = 3.3V 4 ICC (mA) MAX7387/88 toc07 MAX7387/88 toc09 CLOCK OUTPUT WAVEFORM WITH CL = 100pF ICC (mA) MAX7387/MAX7388 System Monitoring Oscillator with Watchdog and Power Fail 3 2 2 1 1 VTH+ = 2.9V 40ns/div -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 4 2.90 3.55 4.20 VCC (V) _______________________________________________________________________________________ 4.85 5.50 System Monitoring Oscillator with Watchdog and Power Fail MAXIMUM VCC TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE POWER-ON RESET BEHAVIOR MAX7387/88 toc11 VCC 2V/div 1000 VCC 2V/div CLOCK 5V/div CLOCK 2V/div tRST RST 5V/div PFI = VCC PFO 5V/div 1µs/div TRANSIENT DURATION (µs) MAX7387/88 toc10 MAX7387/88 toc12 CLOCK SETTLING TIME FROM START RESET OCCURS ABOVE THIS CURVE 100 10 VCC FALLING FROM VTH+ + 100mV 1 100 200 300 400 500 600 700 800 900 1000 100µs/div RESET THRESHOLD OVERDRIVE (mV) RESPONSE OF RST AND WDO WDI EXCEEDING tWDG RISING THRESHOLD vs. TEMPERATURE MAX7387/88 toc13 WDI 2V/div RST 5V/div tRST 2.88 VTH+ (V) WDO 5V/div tWDG MAX7387/88 toc14 2.90 2.86 2.84 2.82 2.80 2ms/div -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) _______________________________________________________________________________________ 5 MAX7387/MAX7388 Typical Operating Characteristics (continued) (Typical Application Circuit, VCC = +5V, TA = +25°C, unless otherwise noted.) System Monitoring Oscillator with Watchdog and Power Fail MAX7387/MAX7388 Pin Description PIN NAME FUNCTION MAX7387 MAX7388 1 PFI Power-Fail Input. PFI monitors the condition of either an external supplied voltage or VCC. See the Power Fail section for more details. 2 1 VCC Power Input. Connect VCC to the power supply. Bypass VCC to GND with a 1µF capacitor. Install the bypass capacitor as close to the device as possible. 3 2 WDS1 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. 4 3 WDS2 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. 5 4 GND Ground 6 WDO Watchdog Output. Open-drain watchdog output asserts low if WDI is not toggled within the watchdog timeout period. 7 5 PFO Power-Fail Output. Open-drain output asserts when the voltage being monitored drops below the power-fail threshold voltage. WDI 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. 8 6 9 7 RST/RST 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. 10 8 CLOCK Clock Output 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. 6 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. _______________________________________________________________________________________ System Monitoring Oscillator with Watchdog and Power Fail 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). 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. 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 5 VITH VCC (V) 4 VITH - VIHYST VTH+ 3 VTH- 2 1 VCCR CLK tRST RST 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 MAX7387/MAX7388 Clock Output (CLOCK) The push-pull clock output (CLOCK) drives a groundconnected 1kΩ load or a positive supply connected 500Ω 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. MAX7387/MAX7388 System Monitoring Oscillator with Watchdog and Power Fail 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. 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. 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 (µP) or microcontroller (µC) clock input. There are no impedance- Table 1. Watchdog Timeout Periods WATCHDOG TIMEOUT PERIOD (ms) WDS1 WDS2 MIN TYP MAX GND GND 11 16 22 VCC/2 = open GND 22 32 44 VCC GND 44 64 88 GND VCC/2 = open 88 128 177 VCC/2 = open VCC/2 = open 177 256 354 VCC VCC/2 = open 354 512 708 GND VCC 708 1024 1416 VCC/2 = open VCC 1416 2048 2832 VCC VCC Disabled Note: WDS1 or WDS2 is pulled to open if left floating. VCC CLK RESET TIMEOUT PERIOD (tRST) RST INTERNAL WATCHDOG STATE ACTIVE TRIPPED WDI WDO WATCHDOG TIMEOUT PERIOD (tWDG) Figure 2. Watchdog Timing Diagram 8 _______________________________________________________________________________________ System Monitoring Oscillator with Watchdog and Power Fail 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 0.1µF 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 2. POR Voltage POWER-ON RESET VOLTAGE (VTH) r 4.38 M 3.96 J 3.44 N 3.34 P 3.13 Q 2.89 S 2.82 V 2.5 X load. Use a bypass capacitor value of at least 1000 times that of the output load capacitance. 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. Table 3. Reset Output Type OUTPUT TYPE s Push-pull RST A Push-pull RST B Open-drain RST C Note: Standard values are shown in bold. Contact factory for other output types. Table 4. Clock Output Frequency Note: Standard values are shown in bold. Contact factory for other POR voltages. CLOCK FREQUENCY (fCLOCK) (MHz) ff 4 RD 8 TP 12 VB 16 Note: Contact factory for other frequencies. WB Selector Guide PART FREQUENCY RANGE (MHz) RESET FUNCTION WATCHDOG INPUT (WDI)/ WATCHDOG OUTPUT (WDO) POWER-FAIL INPUT (PFI)/ PINSPEED POWER-FAIL OUTPUT (PFO) PACKAGE MAX7387 1 to 16 Yes Yes/yes Yes/yes — 10 µMAX MAX7388 1 to 16 Yes Yes/no No/yes — 8 µMAX MAX7389 1 to 16 Yes Yes/yes — — 8 µMAX MAX7390 1 to 16 Yes Yes/no — Yes 8 µMAX MAX7391 1 to 16 Yes — Yes/yes Yes 8 µMAX Note: Other versions with different features are available. Refer to the MAX7389/MAX7390 and MAX7391 data sheets. _______________________________________________________________________________________ 9 MAX7387/MAX7388 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. System Monitoring Oscillator with Watchdog and Power Fail MAX7387/MAX7388 Functional Diagram RST/RST MAX7387 MAX7388 PRESCALER POWER-ON RESET RESET TIMER OSCILLATOR CLOCK WDO* WATCHDOG TIMER WDI N WDS1 WDS2 PFI* PFO INTERNAL (VCC DETECTION) N V_TH *MAX7387 ONLY GND Typical Application Circuit POWER SUPPLY DC-DC 5V WDS1 VCC R1 RST/RST WDS2 PFI* RST/RST PFO INT WDI I/O PORT WDO* I/O PORT MAX7387 MAX7388 µC R2 CLOCK OSC1 GND *MAX7387 ONLY Chip Information PROCESS: BICMOS 10 ______________________________________________________________________________________ System Monitoring Oscillator with Watchdog and Power Fail 8 INCHES DIM A A1 A2 b E Ø0.50±0.1 H c D e E H 0.6±0.1 L 1 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 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 8LUMAXD.EPS 4X S 8 MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 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 A1 A2 A α c e b FRONT VIEW L SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 8L uMAX/uSOP APPROVAL DOCUMENT CONTROL NO. 21-0036 REV. J 1 1 ______________________________________________________________________________________ 11 MAX7387/MAX7388 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 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 10LUMAX.EPS MAX7387/MAX7388 System Monitoring Oscillator with Watchdog and Power Fail 4X S 10 10 INCHES H Ø0.50±0.1 0.6±0.1 1 1 0.6±0.1 BOTTOM VIEW TOP VIEW D2 MILLIMETERS 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 α 0° 6° 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° E2 GAGE PLANE A2 c A b A1 α E1 D1 L L1 FRONT VIEW SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 10L uMAX/uSOP APPROVAL DOCUMENT CONTROL NO. 21-0061 REV. 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 © 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.