MAX694CSLASHD datasheet(4/18 Pages) MAXIM

4 / 18 page

VCC = full operating range, VBATT = 2.8V, TA = +25°C, unless otherwise noted.)

Note 1: The input voltage limits on PFI and WDI may be exceeded provided the input current is limited to less than 10mA.

Note 2: WDI is guaranteed to be in the mid-level (inactive) state if WDI is floating and VCC is in the operating voltage range. WDI is

internally biased to 38% of VCC with an impedance of approximately 125kΩ.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

CHIP ENABLE GATING

CE IN Thresholds

VIL

0.8

VIH

3.0

CE IN Pullup Current

µA

CE OUT Output Voltage

ISINK = 3.2mA

0.4

ISOURCE = 3.0mA

VOUT - 1.5

ISOURCE = 1µA, VCC = 0V

VOUT - 0.05

CE Propagation Delay

VCC = 5V

200

OSCILLATOR

OSC IN Input Current

±2

µA

OSC SEL Input Pullup Current

µA

OSC IN Frequency Range

OSC SEL = 0V

250

kHz

OSC IN Frequency

with External Capacitor

OSC SEL = 0V

COSC = 47pF

kHz

NAME

FUNCTION

MAX690/

MAX692/

MAX694

MAX691/

MAX693/

MAX695

VCC

The +5V Input

VBATT

Backup Battery Input. Connect to Ground if a backup battery is not used.

VOUT

The higher of VCC or VBATT is internally switched to VOUT. Connect VOUT to VCC if

VOUT and VBATT are not used. Connect a 0.1µF or larger bypass capacitor to VOUT.

GND

0V Ground Reference for All Signals

RESET

RESET goes low whenever VCC falls below either the reset voltage threshold or the

VBATT input voltage. The reset threshold is typically 4.65V for the MAX690/691/694/695,

and 4.4V for the MAX692 and MAX693. RESET remains low for 50ms after VCC returns

to 5V, (except 200ms in MAX694/695). RESET also goes low for 50ms if the Watchdog

Timer is enabled but not serviced within its timeout period. The RESET pulse width can

be adjusted as shown in Table 1.

WDI

Watchdog Input (WDI). WDI is a three level input. If WDI remains either high or low for

longer than the watchdog timeout period, RESET pulses low and WDO goes low. The

Watchdog Timer is disabled when WDI is left floating or is driven to mid-supply. The

timer resets with each transition at the Watchdog Timer input.

PFI

Noninverting Input to the Power-Fail Comparator. When PFI is less than 1.3V, PFO

goes low. Connect PFI to GND or VOUT when not used. See Figure 1.

MAX690–MAX695

Microprocessor Supervisory Circuits

www.maximintegrated.com

Maxim Integrated │ 4

Electrical Characteristics (continued)

Pin Description

MAX694C/D Datasheet(PDF) 4 Page - Maxim Integrated Products

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