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參數(shù)資料
| 型號(hào)： | LT1470 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Single and Dual PCMCIA Protected 3.3V/5V VCC Switches |
| 中文描述： | 單路和雙路的PCMCIA保護(hù)3.3V/5V的虛擬通道連接開關(guān) |
| 文件頁數(shù)： | 5/12頁 |
| 文件大小： | 229K |
| 代理商： | LT1470 |
5
LTC1470/LTC1471
PI
FU
CTIO
N
S
U
U
LTC1471
AOUT, BOUT(Pins 1, 16, 8, 9):
Output Pins. The outputs
of the LTC1471 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.
5V
IN
(Pins 2, 10):
5V
Input Supply Pins. The 5V
IN
supply
pins serve two purposes. The first purpose is as the power
supply input for the 5V NMOS switches. The second
purpose is to provide power for the input, gate drive, and
protection circuitry. These pins must therefore be con-
tinuously powered.
EN1, EN0 (Pins 3, 4, 11, 12):
Enable Inputs. The enable
inputs are designed to interface directly with industry
standard PCMCIA controllers and are high impedance
CMOS gates with ESD protection diodes to ground, and
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
5V
IN
0.14
0.12
OUTPUT
3V
IN
BREAK-BEFORE-
MAKE SWITCH
AND CONTROL
TTL-TO-CMOS
CONVERTER
EN0
EN1
LTC1470-BD01
BLOCK DIAGRA
M
W
should not be forced below ground. All four inputs have
about 100mV of built-in hysteresis to ensure clean switch-
ing between operating modes. The LTC1471 is designed
to operate without12V power. The gates of the V
CC
NMOS
switches are powered by charge pumps from the 5V
IN
supply pins (see Applications Information section for
more detail). The enable inputs should be turned off at
least 100
μ
s before the 5V
IN
power is removed to ensure
that all NMOS switch gates are fully discharged and are in
the high impedance mode.
GND (Pins 5, 13):
Ground Connections.
3V
IN
(Pins 6, 7, 14, 15):
3V
Input Supply Pins. The 3V
IN
supply pins serve as the power supply input for the 3.3V
switches. These pins do not not provide any power to the
internal control circuitry, and therefore, do not consume
any power when unloaded or turned off.
(LTC1470 or 1/2 LTC1471)
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