Datasheet
LTC1555L-1.8
4
TYPICAL PERFOR A CE CHARACTERISTICS
UW
V
IN
(V)
2
I
VIN
(µA)
30
40
6
1555L • G01
20
10
3
4
5
50
V
CC
= 5V
V
CC
= 3V
V
CC
= 1.8V
I
VCC
= 0mA
T
A
= 25°C
TEMPERATURE (°C)
–40
I
VIN
(µA)
30
40
120
1555L • G02
20
10
0
40
80
50
V
CC
= 5V
V
CC
= 3V
V
CC
= 1.8V
V
IN
= 3.6V
I
VCC
= 0mA
V
DVCC
(V)
1
I
DVCC
(µA)
10
15
5
1555L • G03
5
0
2
3
4
20
F
CLK
= 1MHz
T
A
= –40°C
T
A
= 85°C
T
A
= 25°C
V
IN
(V)
2
V
CC
(V)
5.0
5.5
6
1555L • G04
4.5
4.0
3
4
5
6.0
V
CC
= 5V
I
VCC
= 10mA
T
A
= –40°C
T
A
= 85°C
T
A
= 25°C
V
IN
(V)
2
V
CC
(V)
3.0
3.3
6
1555L • G05
2.7
2.4
3
4
5
3.6
T
A
= –40°C
T
A
= 85°C
V
CC
= 3V
I
VCC
= 10mA
T
A
= 25°C
V
IN
(V)
2
V
CC
(V)
1.8
2.0
6
1555L • G06
1.6
1.4
3
4
5
2.2
T
A
= –40°C
V
CC
= 1.8V
I
VCC
= 10mA
T
A
= 85°C
T
A
= 25°C
I
VIN
vs V
IN
V
CC
vs V
IN
I
VIN
vs Temperature I
DVCC
vs V
DVCC
V
CC
vs V
IN
V
CC
vs V
IN
PIN FUNCTIONS
UUU
CIN (Pin 1): Clock Input Pin from Controller.
RIN (Pin 2): Reset Input Pin from Controller.
DATA (Pin 3): Controller Side Data Input/Output Pin. Can
be used for single pin bidirectional data transfer between
the controller and the SIM card as long as the controller
data pin is open drain. The controller output must be able
to sink 1mA max when driving the DATA pin low due to the
internal pull-up resistors on the DATA and I/O pins. If the
controller data output is not open drain, then the DDRV pin
should be used for sending data to the SIM card and the
DATA pin used for receiving data from the SIM card.
DDRV (Pin 4): Optional Data Input Pin for Sending Data to
the SIM Card. When not needed, the DDRV pin should
either be left floating or tied to DV
CC
(an internal 1µA
current source will pull the DDRV pin up to DV
CC
if left
floating).
DV
CC
(Pin 5): Supply Voltage for Controller Side Digital
Input/Output Pins (typically 3V). May be between 1.425V
and 4.4V. The DV
CC
supply may be powered-down in
shutdown for further reduction in battery current. When
DV
CC
drops below 1.2V, the charge pump is disabled and
the LTC1555L-1.8 goes into shutdown mode regardless
of the signals on the M0-M2 pins.