LTC1555L View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1555L Datasheet PDF : 8 Pages
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LTC1555L
APPLICATIO S I FOR ATIO
open drain (all SIM I/O pins are open drain). Internal
pull-up resistors are provided for both the DATA pin and
the I/O pin on the SIM side. The second method is to use
the DDRV pin to send data to the SIM and use the DATA pin
to receive data from the SIM. When the DDRV pin is not
used, it should either be left floating or tied to DVCC.
Shutting Down the DVCC Supply
To conserve power, the DVCC supply may be shut down
while the VIN supply is still active. When the DVCC supply
is forced below 1.2V, an undervoltage lockout circuit
CLK TO SIM
RST TO SIM
DATA TO/FROM SIM
CONTROLLER
SIDE
LTC1555L
CIN
CLK
RIN
RST
DATA I/O
DDRV VCC
DVCC
SIM SIDE
1555L F01a
forces the LTC1555L into shutdown mode regardless of
the status of the M0-M1 pins.
10kV ESD Protection
All pins that connect to the SIM (CLK, RST, I/O, VCC, GND)
withstand over 10kV of human body model ESD. In order
to ensure proper ESD protection, careful board layout is
required. The GND pin should be tied directly to a GND
plane. The VCC capacitor should be located very close to
the VCC pin and tied immediately to the GND plane.
CLK TO SIM
RST TO SIM
DATA FROM SIM
DATA TO SIM
CONTROLLER
SIDE
LTC1555L
CIN
CLK
RIN
RST
DATA
I/O
DDRV VCC
DVCC
SIM SIDE
1555L F01b
Figure 1a. Level Translator Connections for
Bidirectional Controller DATA Pin
Figure 1b. Level Translator Connections for
One-Directional Controller Side DATA Flow
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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