ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 µP Power Supply Supervisor With Battery Backup Switch General Description Applications The AS690A / AS692A / AS802L / AS802M / AS805L offers • • • • • • • • complete single chip solutions for power supply monitoring and control battery functions in microprocessor systems. Each device implements four functions: Reset control, watchdog monitoring, battery-backup switching and power-failure monitoring. In addition to microprocessor reset under power-up and power-down conditions, these devices provide batterybackup switching to maintain control in power loss and brownout situations. Additional monitoring capabilities can provide an early warning of unregulated power supply loss before the Embedded control systems Portable/Battery operated systems Intelligent instruments Wireless instruments Wireless communication systems PDAs and hand-held equipments µP / µC power supply monitoring Safety system Typical Operating Circuit Unregulated DC voltage regulator drops out. The important features of these Regulated +5V four functions are: • • • 1.6 second watchdog timer to keep microprocessor responsive 4.40V or 4.65V VCC threshold for microprocessor reset at R2 power-up and power-down SPDT (Single-pole, Double-throw) PMOS switch connects backup power to RAM if VCC fails + _ 3.6 V Lithium Battery RESET RESET PFI PFO NMI VBATT WDI I/O LINE VOUT GND GND BUS • VCC VCC 0.1 µF R1 ASM690A 1.25V threshold detector for power loss or general purpose voltage monitoring VCC These features are pin-compatible with the industry standard GND power-supply supervisors. Short-circuit and thermal protection have also been added. The AS690A / AS802L / AS805L generate a reset pulse when the supply voltage drops below 4.65V and the AS692A / AS802M Block Diagram generate a reset below 4.40V. The ASM802L / ASM802M have power-fail accuracy to ± 2%. The ASM805L is the same as the ASM690A except that RESET is provided instead of RESET. VBATT VCC 8 VOUT Reset Generator 7 RESET (RESET) + |+ Two precision supply-voltage monitor options •4.65V (AS690A / AS802L / AS805L) Battery-backup power switch on-chip Watchdog timer: 1.6 second timeout Power failure / low battery detection Short circuit protection and thermal limiting Small 8-pin SO package No external components Specified over full temperature range - 1.25V Watchdog Timer 3.5V |+ •4.40V (AS692A / AS802M ) • • • • • • • 1 Battery-Switchover Circuit 2 Features • CMOS RAM WDI 6 + |+ + 0.8V PFI 1.25V |+ 4 + ASM690A, ASM692A, ASM802L, ASM802M, (ASM805L) 3 GND Alliance Semiconductor 2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com Notice: The information in this document is subject to change without notice 5 PFO ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Pin Configuration Plastic/CerDip/SO VOUT 1 VCC 2 GND 3 PFI 4 ASM690A ASM692A ASM802L ASM802M (ASM805L) 8 VBATT 7 RESET (RESET) 6 WDI 5 PFO Pin Description Pin Number ASM690A / ASM692A ASM802L / ASM802M Name Function ASM805L Voltage supply for RAM. When VCC is above the reset threshold, VOUT connects to 1 1 VOUT VCC through a P-Channel MOS device. If VCC falls below the reset threshold, this output will be connected to the backup supply at VBATT (or VCC, whichever is higher) through the MOS switch to provide continuous power to the CMOS RAM. 2 2 VCC +5V power supply input. 3 3 GND Ground 4 4 PFI Power failure monitor input. PFI is connected to the internal power fail comparator which is referenced to 1.25V. The power fail output (PFO) is active LOW but remains HIGH if PFI is above 1.25V. If this feature is unused, the PFI pin should be connected to GND or VOUT. 5 5 PFO Power-fail output. PFO is active LOW whenever the PFI pin is less than 1.25V. WDI Watchdog input. The WDI input monitors microprocessor activity. An internal timer is reset with each transition of the WDI input. If the WDI is held HIGH or LOW for longer than the watchdog timeout period, typically 1.6 seconds, RESET (or RESET) is asserted for the reset pulse width time, tRS, of 140ms, minimum. 6 6 Active-LOW reset output. When triggered by VCC falling below the reset threshold 7 - RESET or by watchdog timer timeout, RESET (or RESET) pulses low for the reset pulse width tRS, typically 200ms. It will remain low if VCC is below the reset threshold (4.65V in ASM690A / ASM802L and 4.4V in the ASM692A / ASM802L) and remains low for 200ms after VCC rises above the reset threshold. - 7 RESET 8 8 VBATT Active-HIGH reset output. The inverse of RESET. Auxiliary power or backup-battery input. VBATT should be connected to GND if the function is not used. The input has about 40mV of hysteresis to prevent rapid toggling between VCC and VBATT. µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 2 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Detailed Description Application Information It is important to initialize a microprocessor to a known state Microprocessor Interface in response to specific events that could create code The ASM690 has logic-LOW RESET output while the execution errors and “lock-up”. The reset output of these ASM805 has an inverted logic-HIGH RESET output. supervisory circuits send a reset pulse to the microprocessor Microprocessors with bidirectional reset pins can pose a in response to power-up, power-down/power-loss or a problem when the supervisory circuit and the microprocessor watchdog time-out. output pins attempt to go to opposite logic states. The problem can be resolved by placing a 4.7kΩ resistor between RESET/RESET Timing the RESET output and the microprocessor reset pin. This is Power-up reset occurs when a rising VCC reaches the reset threshold, VRT, forcing a reset condition in which the reset shown in Figure 2. Since the series resistor limits drive capabilities, the reset signal to other devices should be output is asserted in the appropriate logic state for the buffered. duration of tRS. The reset pulse width, tRS, is typically around 200ms and is LOW for the ASM690A, ASM692A, ASM802 and HIGH for the ASM805L. Figure 1 shows the reset pin timing. Power-loss or “brown-out” reset occurs when VCC dips below the reset threshold resulting in a reset assertion for the duration of tRS. The reset signal remains asserted as long as VCC is between VRT and 1.1V, the lowest VCC for which these devices can provide a guaranteed logic-low output. To ensure logic inputs connected to the ASM690A / ASM692A/ASM802 RESET pin are in a known state when VCC is under 1.1V, a 100kΩ pull-down resistor at RESET is needed: the logic-high ASM805L will need a pull-up resistor to VCC. Figure 1: RESET/RESET Timing Watchdog Timer A Watchdog time-out reset occurs when a logic “1” or logic BUF “0” is continuously applied to the WDI pin for more than 1.6 Buffered RESET seconds. After the duration of the reset interval, the watchdog timer starts a new 1.6 second timing interval; the VCC microprocessor must service the watchdog input by changing states or by floating the WDI pin before this interval is finished. If the WDI pin is held either HIGH or LOW, a reset pulse will be triggered every 1.8 seconds (the 1.6 second timing interval plus the reset pulse width tRS). VCC 4.7K Ω Power Supply RESET RESET ASM690A GND GND Bi-directional I/O pin Figure 2: Interfacing with bi-directional microprocessor reset inputs µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 3 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Watchdog Input As discussed in the Reset section, the Watchdog input is VBATT VCC used to monitor microprocessor activity. It can be used to insure that the microprocessor is in a continually responsive state by requiring that the WDI pin be toggled every second. If the WDI pin is not toggled within the 1.6 second window SW1 SW2 (minimum tWD + tRS), a reset pulse will be asserted to return the microprocessor to the initial start-up state. Pulses as ASM690A ASM692A short as 50ns can be applied to the WDI pin. If this feature is not used, the WDI pin should be open circuited or the logic SW3 SW4 ASM805L D3 ASM802L placed into a high-impedance state to allow the pin to float. D2 D1 ASM802M VOUT Backup-Battery Switchover A power loss can be made less severe if the system RAM contents are preserved. This is achieved in the ASM690/692/ Figure 3: Internal device configuration of battery switch-over function 802/805 by switching from the failed VCC to an alternate power source connected at VBATT when VCC is less than the reset threshold voltage (VCC < VRT), and VCC is less than VBATT. The VOUT pin is normally connected to VCC through a 2Ω PMOS switch but a brown-out or loss of VCC will cause a switchover to VBATT by means of a 20Ω PMOS switch. Although both conditions (VCC < VRT and VCC <VBATT) must occur for the switchover to VBATT to occur, VOUT will be switched back to VCC when VCC exceeds VRT irrespective of Table 1. Pin Connections in Battery Backup Mode Pin VOUT Connection Connected to VBATT through internal PMOS switch the voltage at VBATT. It should be noted that an internal VBATT device diode (D1 in Figure 3) will be forward biased if VBATT exceeds VCC by more than a diode drop when VCC is PFI Disabled PFO Logic-LOW switched to VOUT. Because of this it is recommended that VBATT be no greater than VRT +0.6V. RESET WDI Condition SW1/SW2 SW3/SW4 VCC > Reset Threshold open closed open closed closed open VCC < Reset Threshold VCC > VBATT VCC < Reset Threshold VCC < VBATT ASM690A/802A/805L Reset Threshold = 4.65V ASM692A /ASM802M Reset Threshold = 4.4V Connected to VOUT Logic-LOW (except on ASM805 where it is HIGH) Watchdog timer disabled During the backup power mode, the internal circuitry of the supervisory circuit draws power from the battery supply. While VCC is still alive, the comparator circuits remain alive and the current drawn by the device is typically 35µA. When VCC drops more than 1.1V below VBATT, the internal switchover comparator, the PFI comparator and WDI comparator will shut off, reducing the quiescent current drawn by the IC to less than 1µA. µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 4 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Backup Power Sources - Batteries diode-resistor pair clamps the capacitor voltage at one diode Battery voltage selection is important to insure that the drop below VCC. VCC itself should be regulated within ±5% of battery does not discharge through the parasitic device diode 5V for the ASM692A/802M or within ±10% of 5V for the D1 (see Figure 3) when VCC is less than VBATT and VCC > ASM690A/802L/805L to insure that the storage capacitor VRT. does not achieve an over voltage state. Table 2: Maximum Battery Voltages Note: SuperCapTM is a trademark of Baknor Industries Part Number MAXIMUM Battery Voltage ASM690A 4.80 ASM802L 4.80 ASM805L 4.80 ASM692A 4.55 ASM802M 4.55 +5V To SRAM VOUT VCC D1 VBATT + 0.1F Although most batteries that meet the requirements of Table To µP RESET (RESET) ASM692A ASM802M GND 2 are acceptable, lithium batteries are very effective backup source due to their high-energy density and very low selfdischarge rates. Figure 4: Capacitor as a backup power source Battery replacement while Powered Batteries can be replaced even when the device is in a +5V powered state as long as VCC remains above the reset threshold voltage VRT. In the ASM devices, a floating VBATT pin will not cause a powersupply switchover as can occur in some other supervisory circuits. If VBATT is not used, the pin should be grounded. VOUT VCC D1 D2 VBATT Backup Power Sources - SuperCap™ Capacitor storage, with very high values of capacitance, can be used as a back-up power source instead of batteries. 100K + 0.1F RESET (RESET) To SRAM To µP ASM692A ASM802M SuperCap™ are capacitors with capacities in the fractional GND farad range. A 0.1 farad SuperCap™ would provide a useful backup power source. Like the battery supply, it is important that the capacitor voltage remain below the maximum voltages shown in Table 2. Although the circuit of Figure 4 shows the most simple way to connect the SuperCap™, this circuit cannot insure that an over voltage condition will not Figure 5: Capacitor as a backup power source Voltage clamped to 0.5V below VCC occur since the capacitor will ultimately charge up to VCC. To insure that an over voltage condition does not occur, the circuit of Figure 5 is preferred. In this circuit configuration, the µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 5 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Operation without a Backup Power Source Power Fail Hysteresis When operating without a back-up power source, the VBATT A noise margin can be added to the simple monitoring circuit pin should be connected to GND and VOUT should be of Figure 6 by adding positive feedback from the PFO pin. connected to VCC, since power source switchover will not The circuit of Figure 7 adds this positive “latching” effect by occur. Connecting VOUT to VCC eliminates the voltage drop due to the ON-resistance of the PMOS switch. means of an additional resistor R3 connected between PFO and PFI which helps in pulling PFI in the direction of PFO and eliminating an indecision at the trip point. Resistor R3 is normally about 10 times higher in resistance than R2 to keep Power-Fail Comparator The Power Fail feature is an independent voltage monitoring function that can be used for any number of monitoring activities. The PFI function can provide an early sensing of power supply failure by sensing the voltage of the unregulated DC ahead of the regulated supply sensing seen by the backup-battery switchover circuitry. The PFI pin is the hysteresis band reasonable and should be larger than 10kΩ to avoid excessive loading on the PFO pin. The calculations for the correct values of resistors to set the hysteresis thresholds are given in Figure 7. A capacitor can be added to offer additional noise rejection by low-pass filtering. compared to a 1.25V internal reference. If the voltage at the PFI pin is less than this reference voltage, the PFO pin goes VIN +5V low. By sensing the voltage of the raw DC power supply, the microprocessor system can prepare for imminent power-loss, especially if the battery backup supply is not enabled. The VCC R1 ASM690A ASM692A ASM802L ASM802M ASM805L input voltage at the PFI pin results from a simple resistor PFI voltage divider as shown in Figure 6. R2 VIN C1* +5V PFO VCC R1 R3 GND ASM690A ASM692A ASM802L ASM802M ASM805L PFO PFI R2 +5V PFO 0V GND V A B 0V 5R 2 A = -------------------- < 1.25V R +R 1 2 VL VTRIP VH 0V +5V PFO * Optional To µP 5R 2 B = -------------------- > 1.25V R1 + R2 1.25 TRIP = ------------------------⎛ R2 ⎞ ⎜ --------------------⎟ ⎝ R 2 + R 2⎠ 1.25 V H = -----------------------------------|| R 2 R3 ⎞ ⎛ ----------------------------⎝ R 1 + R 2 || R 3⎠ V L – 1.25 5 – 1.25 1.25----------------------- + ------------------- = --------R1 R3 R2 Figure 6: Simple Voltage divider sets PFI trip point Figure 7: Hysterisis Added To PFI Pin µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 6 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Monitoring Capabilities Of The Power-fail Input: Although designed for power supply failure monitoring, the PFI pin can be used for monitoring any voltage condition that +5V can be scaled by means of a resistive divider. An example is ASM690A VCC ASM692A the negative power supply monitor configured in Figure 8. In this case a good negative supply will hold the PFI pin below R1 1.25V and the PFO pin will be at logic “0”. As the negative ASM802L ASM802M PFI ASM805L PFO voltage declines, the voltage at the PFI pin will rise until it exceeds 1.25V and the PFO pin will go to logic “1”. R2 GND V- V- = VTRIP +5V PFO 0V VTRIP V- 0V 1.25 – V TRIP 5-----------------– 1.25= ------------------------------R2 R1 Figure 8: Using PFI To Monitor Negative Supply Voltage µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 7 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Absolute Maximum Ratings Parameter Min Max Unit VCC -0.3 6.0 V VBATT -0.3 6.0 V All other inputs * -0.3 VCC + 0.3 V Input Current at VCC 200 mA Input Current at VBATT 50 mA Input Current at GND 20 mA Pin Terminal Voltage with Respect to Ground Output Current VOUT Short circuit protected All other inputs 20 mA Rate of Rise: VBATT and VCC 100 V/µs Plastic DIP (derate 9mW/°C above 70°C) 800 mW SO (derate 5.9mW/°C above 70°C) 500 mW CerDIP (derate 8mW/°C above 70°C) 650 mW Continuous Power Dissipation Operating Temperature Range (C Devices) 0 70 °C Operating Temperature Range (E Devices) -40 85 °C Storage Temperature Range -65 160 °C 300 °C Lead Temperature Soldering, (10 sec) * The input voltage limits on PFI and WDI may be exceeded if the current is limited to less than 10mA Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 8 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Electrical Characteristics: Unless other wise noted, VCC = 4.75V to 5.5V for the ASM690A / ASM802L / ASM805L and VCC = 4.5V to 5.5V for the ASM692A / ASM802M; VBATT = 2.8V; and TA = TMIN to TMAX. Parameter Symbol VCC, VBATT Voltage Range (Note 1) Supply Current Excluding IOUT IS Conditions Min 1.1 5.5 ASM805LC 1.1 5.5 ASM69_AE, ASM80__E 1.1 5.5 ASM69_AC, ASM80__E 35 100 ASM69_AC, ASM802_C 35 100 TA = 25°C VCC = 0V, VBATT=2.8V VBATT Standby 5.5V>VCC>VBATT-0.2V Current (Note 2) TA = TMIN to TMAX TA = 25°C TA = TMIN to TMAX VOUT in Battery Backup Mode Battery Switch Threshold, VCC to VBATT -0.1 -1.0 VCC- IOUT = 5mA VOUT Output 0.025 Unit V µA 1.0 5.0 µA 0.02 0.02 µA VCC-0.010 V IOUT = 50mA VCC-0.25 VCC-0.10 IOUT=250µA, VCC < VBATT-0.2V VBATT-0.1 VBATT-0.001 V 20 -20 mV 40 mV VCC < VRT Power Up Power Down Battery Switch over Hysteresis VRT Max ASM69_AC, ASM802_C ISUPPLY in Battery Backup Mode (Excluding IOUT) Reset Threshold Typ ASM690A/802L/805L 4.50 4.65 4.75 ASM692A, ASM802M 4.25 4.40 4.50 ASM802L, TA = 25°C, VCC falling 4.55 4.70 ASM802M, TA=25°C, VCC falling 4.30 4.45 V Notes: 1. If VCC or VBATT is 0V, the other must be greater than 2.0V. 2. Battery charging-current is “-”. Battery discharge current is “+”. 3. WDI is guaranteed to be in an intermediate level state if WDI is floating and VCC is within the operating voltage range. WDI input impedance is 50 kΩ. WDI is biased to 0.3VCC. µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 9 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Parameter Symbol Conditions Min Reset Threshold Hysteresis Reset Pulse Width Typ 40 tRS 140 ISOURCE = 800µA 200 ASM69_AE, ASM802_E, VCC=1.2V, 0.3 ISINK=100µA ASM805LC, ISOURCE=4µA, VCC = 1.1V 0.8 ASM805LE, ISOURCE=4µA, VCC = 1.2V 0.9 tWD WDI Pulse Width tWP WDI Input Threshold (Note 3) PFI Input Threshold 2.25 50 -150 150 -50 µA µA 0.8 ASM69_A,ASM805L, VCC = 5V 1.20 1.25 1.30 ASM802_C/E, VCC = 5V 1.225 1.250 1.275 -25 0.01 25 ISOURCE = 800µA sec ns VCC = 5V, Logic LOW PFI Input Current PFO Output Voltage 1.60 50 WDI = VCC WDI = 0V V 0.4 1.00 VIL = 0.4V, VIH = 0.8VCC ms VCC - 1.5 ASM805L, ISINK=3.2mA Watchdog Timeout 280 0.3 ISINK=50µA ASM805L, ISOURCE=800µA mV 0.4 ASM69_AC, ASM802_C, VCC=1.0V, Reset Output Voltage Unit VCC - 1.5 ISINK = 3.2mA WDI Input Current Max V V VCC - 1.5 ISINK = 3.2mA nA V 0.4 Notes: 1. If VCC or VBATT is 0V, the other must be greater than 2.0V. 2. Battery charging-current is “-”. Battery discharge current is “+”. 3. WDI is guaranteed to be in an intermediate level state if WDI is floating and VCC is within the operating voltage range. WDI input impedance is 50 kΩ. WDI is biased to 0.3VCC. µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 10 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Plastic DIP (8-Pin) Package Information Inches Min Millimeters Max Min Max Plastic DIP (8-Pin) * CerDIP (8-Pin) A - 0.210 - 5.33 A1 0.015 - 0.38 - A2 0.115 0.195 2.92 4.95 b 0.014 0.022 0.36 0.56 b2 0.045 0.070 1.14 1.78 b3 0.030 0.045 0.80 1.14 D 0.355 0.400 0.80 1.14 D1 0.005 - 0.13 - E 0.300 0.325 7.62 8.26 E1 0.240 0.280 6.10 e 0.100 - 2.54 eA 0.300 - 7.62 eB - 0.430 eC - 0.060 L 0.115 0.150 7.11 - 10.92 2.92 3.81 CerDIP (8-Pin) SO (8-Pin) A - 0.200 - 5.08 A1 0.015 0.070 0.38 1.78 b 0.014 0.023 0.36 0.58 B2 0.038 0.065 0.97 1.65 C 0.008 0.015 0.20 0.38 D - 0.405 - 10.29 D1 0.005 - 0.13 - E 0.290 0.320 7.37 8.13 E1 0.220 0.310 5.59 7.87 e 0.100 L 0.125 A 0.053 A1 B 2.54 0.200 3.18 5.08 0.069 1.35 1.75 0.004 0.010 0.10 0.25 0.013 0.020 0.33 0.51 C 0.007 0.010 0.19 0.25 SO (8-Pin) ** e 0.050 E 0.150 0.157 1.27 3.80 4.00 H 0.228 0.244 5.80 6.20 L 0.016 0.050 0.40 1.27 D 0.189 0.197 4.80 5.00 µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 11 of 13 ASM690A / 692A ASM802L / 802M ASM805L October 2003 rev 1.0 Ordering Information Part Number Reset Threshold (V) Temperature Range (°C) Pins-Package ASM690ACPA 4.5 TO 4.75 0 TO +70 8-Plastic DIP ASM690ACSA 4.5 TO 4.75 0 TO +70 8-SO ASM690AC/D 4.5 TO 4.75 25 DICE -40 TO +85 8-Plastic DIP ASM690A ASM690AEPA ASM690AESA 4.5 TO 4.75 -40 TO +85 8-SO ASM690AMJA 4.5 TO 4.75 Contact Factory 8-Cer DIP ASM692ACPA 4.25 TO 4.50 0 TO +70 8-Plastic DIP ASM692ACSA 4.25 TO 4.50 0 TO +70 8-SO ASM692AC/D 4.25 TO 4.50 25 DICE ASM692AEPA 4.25 TO 4.50 -40 TO +85 8-Plastic DIP ASM692AESA 4.25 TO 4.50 -40 TO +85 8-SO ASM692AMJA 4.25 TO 4.50 Contact Factory 8-Cer DIP ASM802LCPA 4.5 TO 4.75 0 TO +70 8-Plastic DIP ASM802LCSA 4.5 TO 4.75 0 TO +70 8-SO ASM802LAEPA 4.5 TO 4.75 -40 TO +85 8-Plastic DIP ASM802LESA 4.5 TO 4.75 -40 TO +85 8-SO ASM802MCPA 4.25 TO 4.50 0 TO +70 8-Plastic DIP ASM802MCSA 4.25 TO 4.50 0 TO +70 8-SO ASM802MEPA 4.25 TO 4.50 -40 TO +85 8-Plastic DIP ASM802MESA 4.25 TO 4.50 -40 TO +85 8-SO ASM805LCPA 4.5 TO 4.75 0 TO +70 8-Plastic DIP ASM805LCSA 4.5 TO 4.75 0 TO +70 8-SO ASM805LC/D 4.5 TO 4.75 25 DICE ASM805LEPA 4.5 TO 4.75 -40 TO +85 8-Plastic DIP ASM805LESA 4.5 TO 4.75 -40 TO +85 8-SO ASM805LMJA 4.5 TO 4.75 Contact Factory 8-Cer DIP ASM692A ASM802L ASM802M ASM805L µP Power Supply Supervisor With Battery Backup Switch Notice: The information in this document is subject to change without notice 12 of 13 October 2003 ASM690A / 692A ASM802L / 802M ASM805L rev 1.0 Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel: 408 - 855 - 4900 Fax: 408 - 855 - 4999 www.alsc.com Copyright © Alliance Semiconductor All Rights Reserved Part Number: ASM690A / 692A ASM802L / 802M ASM805L Document Version: 1.0 © Copyright 2003 Alliance Semiconductor Corporation. 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