ltc4555 Linear Technology Corporation, ltc4555 Datasheet - Page 4

• Manufacturer Part Number: ltc4555
• Description: Sim Power Supply And Level Translator
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
LTC4555
SHDN (Pin 1): Controller Driven Shutdown Pin. This pin
should be high (DV
activate a low current shutdown mode.
V
V
DV
Pins (C
is disabled, placing the LTC4555 in shutdown mode. This
pin should be bypassed with a 0.1µF ceramic capacitor
close to the pin.
NC (Pins 4, 6, 12, 16): No Connect.
V
and 6V for normal operation. V
reduces to <1µA in shutdown. This pin should be by-
passed with a 0.1µF ceramic capacitor close to the pin.
V
capacitor needs to be connected close to the V
stable operation. This pin is discharged to GND during
shutdown.
TYPICAL PERFOR A CE CHARACTERISTICS
4
SEL
CC
BAT
CC
U
CC
= 1.8V while driving this pin to DV
(Pin 7): SIM Card V
(Pin 5): V
(Pin 2): V
(Pin 3): Supply Voltage for the Controller Side I/O
IN
, R
U
IN
170
150
130
110
, DATA). When below 1.1V, the V
90
70
50
CC
–40
CC
V
Supply Input. This pin can be between 3V
CC
Voltage Select Pin. A low level selects
–20
U
CC
Short-Circuit Current
) for normal operation and low to
0
TEMPERATURE (°C)
CC
W
20
Supply. A 1µF low ESR
40
U
BAT
60
CC
quiescent current
selects V
80
4555 G01
100
CC
CC
CC
supply
pin for
= 3V.
I/O (Pin 8): SIM-Side Data I/O. The SIM card output must
be on an open drain driver capable of sourcing >1mA.
RST (Pin 9): Reset Output Pin for the SIM Card.
GND (Pin 10): Ground for the SIM and Controller. Proper
grounding and bypassing is required to meet 14kV ESD
specifications. Exposed pad must also be connected to
GND.
CLK (Pin 11): Clock Output Pin for the SIM Card. This pin
is pulled to ground during shutdown. Fast rising and
falling edges necessitate careful board layout for the CLK
node.
C
R
DATA (Pin 15): Controller Side Data I/O. This pin is used
for bidirectional data transfer. The controller output must
be an open-drain configuration. The open-drain output
must be capable of sinking greater than 1mA.
IN
IN
(Pin 13): Clock Input from the Controller.
(Pin 14): Reset Input from the Controller.
22
20
18
16
14
12
10
2.5
I
BAT
3.0
vs V
T
A
= 85°C
3.5
BAT
T
V
A
CC
= 25°C
T
4.0
V
= 3V
A
BAT
= 85°C
T
4.5
(V)
A
= –40°C
V
T
CC
A
= 25°C
5.0
= 1.8V
T
A
= –40°C
5.5
4555 G02
6.0
4555fa