4

LTC1470/LTC1471

LTC1470

OUT (Pins 1, 8): Output Pins. The outputs of the LTC1470

are switched between three operating states: OFF, 3.3V

and 5V. These pins are protected against accidental short

circuits to ground by SafeSlot current limit circuitry which

protects the socket, the card, and the system power

supplies against damage. A second level of protection is

provided by thermal shutdown circuitry which protects

both switches against over-temperature conditions.

serves two purposes. The first purpose is as the power

supply input for the 5V NMOS switch. The second purpose

is to provide power for the input, gate drive, and protection

must therefore be continuously powered.

inputs are designed to interface directly with industry

standard PCMCIA controllers and are high impedance

CMOS gates with ESD protection diodes to ground, and

should not be forced below ground. Both inputs have

about 100mV of built-in hysteresis to ensure clean switch-

ing between operating modes. The LTC1470 is designed

to operate

supply pins (see Applications Information section for

more detail). The Enable inputs should be turned off (both

asserted high or both asserted low) at least 100

µs before

switch gates are fully discharged and both switches are in

the high impedance mode.

GND (Pin 5): Ground Connection.

pins serve as the power supply input for the 3.3V switches.

These pins do not provide any power to the internal control

circuitry and therefore do not consume any power when

unloaded or turned off.

JUNCTION TEMPERATURE (

°C)

0

0

0.05

0.10

0.15

0.20

0.25

0.30

25

50

75

100

1470/71 G06

125

PROGRAMMED

TO 5V

5V Switch Resistance

TIME (ms)

– 0.2

0

1

1.4

1470/71 G08

6

4

0

0.2

0.6

1.0

2

3

2

0

0.4

0.8

1.2

CURRENT

LIMITED

Inrush Current (5V Switch)

Inrush Current (3.3V Switch)

TIME (ms)

– 0.2

0

1

1.4

1470/71 G09

6

4

0

0.2

0.6

1.0

2

3

2

0

0.4

0.8

1.2

(LTC1470 or 1/2 LTC1471)