7

LTC1472

TTL-TO-CMOS

CONVERTER

OSCILLATOR

AND BIAS

GATE CHARGE

AND

DISCHARGE

CONTROL LOGIC

CHARGE

PUMP

GATE CHARGE

AND

DISCHARGE

CONTROL LOGIC

CURRENT LIMIT

AND THERMAL

SHUTDOWN

0.14

Ω

0.12

Ω

BREAK-BEFORE-

MAKE SWITCH

AND CONTROL

TTL-TO-CMOS

CONVERTER

LTC1470-BD01

100

Ω

1.7

Ω

0.5

Ω

10V

VPP EN1

VPP EN0

SHDN

GATE CHARGE

AND

DISCHARGE

CONTROL LOGIC

OSCILLATOR

AND BIAS

CURRENT LIMIT

AND THERMAL

SHUTDOWN

CHARGE

PUMP

GATE CHARGE

AND

DISCHARGE

CONTROL LOGIC

CHARGE

PUMP

BREAK-BEFORE-

MAKE SWITCH

TTL-TO-CMOS

CONVERTER

TTL-TO-CMOS

CONVERTER

–

+

The LTC1472 protected switch matrix is designed to be a

a PCMCIA compatible card system. The LTC1472 consists

section, and the VPP switching section.

following functional blocks:

wide range of 3V and 5V logic families. The input threshold

voltage is approximately 1.4V with approximately 100mV

of hysteresis. The inputs enable the bias generator, the

gate charge pumps and the protection circuity which are

are turned off, the entire circuit is powered down and the