MAX693AC/D Maxim Integrated, MAX693AC/D Datasheet
![no-image](/images/no-image-200.jpg)
MAX693AC/D
Specifications of MAX693AC/D
Related parts for MAX693AC/D
MAX693AC/D Summary of contents
Page 1
... SYSTEM STATUS INDICATORS MaxCap is a registered trademark of Kanthal Globar, Inc. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ____________________________Features o 200ms Power-OK/Reset Timeout Period o 1µA Standby Current, 30µA Operating Current ...
Page 2
... Microprocessor Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V .......................................................................-0.3V to +6V CC VBATT...................................................................-0.3V to +6V All Other Inputs .....................................-0. Input Current V Peak...........................................................................1. Continuous.............................................................250mA CC VBATT Peak ..................................................................250mA VBATT Continuous ..........................................................25mA GND, BATT ON .............................................................100mA All Other Outputs ............................................................25mA 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 ...
Page 3
... Microprocessor Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued) (MAX691A, MAX800L +4.75V to +5.5V; MAX693A, MAX800M unless otherwise noted.) PARAMETER Battery Switchover Hysteresis I = 3.2mA BATT ON Output SINK Low Voltage I = 25mA SINK Sink current BATT ON Output Short-Circuit Current Source current RESET AND WATCHDOG TIMER MAX691A, MAX800L ...
Page 4
... Microprocessor Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued) (MAX691A, MAX800L +4.75V to +5.5V; MAX693A, MAX800M unless otherwise noted.) PARAMETER POWER-FAIL COMPARATOR MAX69_AC/AE/AM, V PFI Input Threshold MAX800_C/E, V PFI Leakage Current I SINK PFO Output Voltage I SOURCE PFO Output Short-Circuit Output source current Current V = -20mV PFI-to-PFO Delay ...
Page 5
... Microprocessor Supervisory Circuits __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted SUPPLY CURRENT CC vs. TEMPERATURE (NORMAL OPERATING MODE VBATT = 2.8V PFI -60 - 120 150 TEMPERATURE (°C) VBATT to V ON-RESISTANCE OUT vs. TEMPERATURE 20 VBATT = 2.0V 15 VBATT = 2.8V 10 VBATT = 4 ...
Page 6
... Microprocessor Supervisory Circuits ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A BATTERY CURRENT vs. INPUT SUPPLY VOLTAGE 20 VBATT = 2. OUT ( vs. OUTPUT CURRENT CC OUT (NORMAL OPERATING MODE) 1000 V = 4.5V CC VBATT = 0V 100 SLOPE = 0.8Ω ...
Page 7
... Microprocessor Supervisory Circuits ______________________________________________________________Pin Description PIN NAME Battery-Backup Input. Connect to external battery or capacitor and charging circuit. If backup battery is not 1 VBATT used, connect to GND. Output Supply Voltage. When When V falls below VBATT and is below the reset threshold, V OUT CC CC capacitor from V ...
Page 8
... Microprocessor Supervisory Circuits 15 RESET 1kΩ MAX691A MAX693A Figure 1. Adding an external pulldown resistor ensures – — — — — – valid with V down to GND. CC RESET and RESET are asserted when V the reset threshold (4.65V for the MAX691A/MAX800L, 4.4V for the MAX693A/MAX800M) and remain asserted ...
Page 9
... Microprocessor Supervisory Circuits Table 1. Reset Pulse Width and Watchdog Timeout Selections OSC SEL OSC IN Low External Clock Input Low External Capacitor Floating Low Floating Floating EXTERNAL CLOCK MAX691A MAX693A 8 OSC SEL MAX800L MAX800M 7 OSC IN 50kHz INTERNAL OSCILLATOR 1.6s WATCHDOG 8 OSC SEL N.C. 7 N.C. OSC IN Figure 3 ...
Page 10
... Microprocessor Supervisory Circuits 4.65V VBATT MAX691A MAX693A MAX800L MAX800M 7 OSC IN 8 OSC SEL 11 WDI 9 PFI 1.25V * 4.4V FOR THE MAX693A/MAX800M Figure 4. MAX691A/MAX693A/MAX800L/MAX800M Block Diagram 5. RESET 4.0V THRESHOLD 5. OUT 0V 5V RESET 0V 5V RESET 0V LOGIC LEVELS SHOWN ARE FROM 0V TO 5V. ...
Page 11
... Microprocessor Supervisory Circuits + VBATT 2.8V MAX691A MAX693A MAX800L MAX800M OUT 50Ω GND OUTPUT IMPEDANCE Figure 6. CE Propagation Delay Test Circuit Table 2. Input and Output Status in Battery-Backup Mode PIN NAME STATUS 1 VBATT Supply current is 1µA max connected to VBATT through an ...
Page 12
... Microprocessor Supervisory Circuits Battery-Backup Input The Battery-Backup Input (VBATT) is similar to the V input except the PMOS switch and parallel diode are much smaller. Accordingly, the on-resistances of the diode and the switch are each approximately 10Ω. Continuous current should be limited to 25mA and peak currents (only during power-up) limited to 250mA. ...
Page 13
... Microprocessor Supervisory Circuits Rp* V OUT OUT MAX691A MAX693A MAX800L MAX800M GND *MAXIMUM Rp VALUE DEPENDS ON ACTIVE-HIGH THE NUMBER OF RAMS. CE LINES MINIMUM Rp VALUE IS 1kΩ. FROM LOGIC Figure 10. Alternate CE Gating Using Separate Power Supplies for VBATT and V If using separate power supplies for V VBATT must be less than 0 ...
Page 14
... Microprocessor Supervisory Circuits 100 +25°C A 0.1μF CAPACITOR 80 FROM 100 1000 RESET COMPARATOR OVERDRIVE, (Reset Threshold Voltage - V CC Figure 13. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive parator. Select the ratio of R1 and R2 such that PFI sees 1 ...
Page 15
... Microprocessor Supervisory Circuits Maximum V The V fall time is limited by the propagation delay of CC the battery switchover comparator and should not exceed 0.03V/µs. A standard rule of thumb for filter capacitance on most regulators is on the order of 100µF per amp of current. When the power supply is shut off or ...
Page 16
... MAX691AMSE/PR-T -55°C to +125°C MAX693ACUE -0°C to +70°C MAX693ACSE -0°C to +70°C MAX693ACWE -0°C to +70°C MAX693ACPE -0°C to +70°C MAX693AC/D -0°C to +70°C MAX693AEUE -40°C to +85°C MAX693AESE -40°C to +85°C MAX693AEWE -40°C to +85°C MAX693AEPE -40°C to +85°C MAX693AEJE -40° ...
Page 17
... 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 ____________________ 17 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...