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LTC1472CS Datasheet(PDF) 7 Page - Linear Technology

Part # LTC1472CS
Description  Protected PCMCIA VCC and VPP Switching Matrix
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1472CS Datasheet(HTML) 7 Page - Linear Technology

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LTC1472
1472fa
BLOCK DIAGRAM
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
5VIN
0.14
0.12
VCC(OUT)
3VIN
BREAK-BEFORE-
MAKE SWITCH
AND CONTROL
TTL-TO-CMOS
CONVERTER
VCC EN0
VCC EN1
LTC1470-BD01
VPPIN
VPPIN
VCC(IN)
VPPOUT
100
1.7
0.5
10V
VPP EN1
VPP EN0
SHDN
VDD
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
+
OPERATION
The LTC1472 protected switch matrix is designed to be a
complete single slot solution for VCC and VPP switching in
a PCMCIA compatible card system. The LTC1472 consists
of two independent functional sections: the VCC switching
section, and the VPP switching section.
THE VCC SWITCHING SECTION
The VCC switching section of the LTC1472 consist of the
following functional blocks:
VCC Switch Input TTL-CMOS Converters
The LTC1472 VCC inputs are designed to accommodate a
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
powered from the 5VIN supply. Therefore, when the inputs
are turned off, the entire circuit is powered down and the
5VIN supply current drops below 1µA.


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