5

LT1313

Supply Pins: Power is supplied to the device through the

two supply pins

which must be connected together at all

times . The supply pins should be bypassed to ground if

the device is more than six inches away from the main

supply capacitor. A bypass capacitor in the range of 0.1

µF

to 1

µF is sufficient. The supply voltage to the LT1313 can

be loosely regulated between 13V and 20V.

two PCMCIA card VPP pins which are typically tied to-

to approximately 330mA. Thermal shutdown provides a

second level of protection. A 1

µF to 10µF tantalum output

capacitor is recommended.

Input Enable Pins: The four digital input pins are high

impedance inputs with approximately 20

µA input current

at 2.4V. The input thresholds are compatible with CMOS

controllers and can be driven from either 5V or 3.3V CMOS

logic. ESD protection diodes limit input excursions to 0.6V

below ground.

VALID Output Pins: These pins are open-collector NPN

outputs which are driven low when the corresponding

external 51k pull-up resistors are connected between

these outputs and the same 5V or 3.3V logic supply

powering the PCMCIA compatible control logic.

5V to 3.3V depending upon the voltage sensed at the

current for these pins is approximately 30

µA. For 5V only

operation, connect the Sense pins directly to ground. An

ESD protection diode limits the input voltage to 0.6V below

ground.

Ground Pins:

The two ground pins must be connected

together at all times.

–

+

–

+

XEN0

XEN1

XVALID

1313 BD

11V

LOW DROPOUT

LINEAR

REGULATOR

VOLTAGE

LOGIC CONTROL

4V

X = A OR B