Datasheet

MAX1840/MAX1841
Low-Voltage SIM/Smart Card
Level Translators in µMAX
_______________________________________________________________________________________ 7
0V/3V/5V for full compatibility with SIM/smart-card specifi-
cations. Figure 2 shows the charge pump for SIM card
applications. Alternatively, the MAX619 generates a regu-
lated 5V from input voltages as low as 2V.
SPI/QSPI/MICROWIRE Interface
The MAX1840/MAX1841 are also useful as 3V/5V level
shifters in SPI, QSPI, and MICROWIRE applications
(Figure 3). On the slave side, connect CLK to SCLK,
RST to CS, and IO to DOUT and DIN. The unidirectional
level shifters transfer chip select and clock signals to
the slave device(s), while the bidirectional level shifter
transfers data.
___________________Chip Information
TRANSISTOR COUNT: 211
V
CC
SIM OR
SMART
CARD
SYSTEM
CONTROLLER
CLK
RST
IO
GND GND
IO
CLK
RST
OUT
GND
PGND
GND
V
CC
DV
CC
DV
CC
+3.0V
3.0V OR 5.0V
MAX1840
MAX1841
MAX1686
MAX1686H
SHDN*
SHDN
3/5
OPTIONAL
RIN
IN
CXN CXP
CIN
OPTIONAL
DATA
DDRV*
SHDN FOR MAX1840 ONLY;
DDRV FOR MAX1841 ONLY.
*
Figure 2. Using MAX1840/MAX1841 and MAX1686/MAX1686H
Charge Pump for SIM Card Applications
V
CC
SPI/QSPI/
MICROWIRE
SYSTEM
SYSTEM
CONTROLLER
SCLK
CS
DOUT
DIN
GND GND
IO
CLK
RST
OUT
SET
PGND
GND
V
CC
DV
CC
DV
CC
+5.0V
+3.3V
MAX1840
MAX1841
MAX8867
MAX8860
SHDN*
SHDN
OPTIONAL
RIN
IN
CIN
OPTIONAL
DATA
DDRV*
SHDN FOR MAX1840 ONLY;
DDRV FOR MAX1841 ONLY.
*
Figure 3. MAX1840/MAX1841 with SPI/QSPI/MICROWIRE
Interfaces