MAX1740 Maxim, MAX1740 Datasheet - Page 9

• Manufacturer Part Number: MAX1740
• Description: SIM/Smart Card Level Translators in MAX
• Manufacturer: Maxim

est, which is then discharged into the test device
through a 1.5kΩ resistor.
To provide 5V when interfacing with a 5V SIM/smart
card, 3V systems require a DC-DC converter. The
MAX1686H +5V regulating charge pump for SIM cards
provides 0V/3V/5V for full compatibility with SIM/smart
card specifications. Figure 4 shows the charge pump
for SIM card applications. Alternatively, the MAX619
generates a regulated 5V from input voltages as low as
2V.
Figure 3a. Human Body ESD Test Model
Figure 4. Using MAX1740/MAX1741 and MAX1686/MAX1686H
Charge Pump for SIM Card Applications
CONTROLLER
VOLTAGE
SOURCE
HIGH-
SYSTEM
DC
GND
+3.0V
DV
CC
CHARGE-CURRENT
LIMIT RESISTOR
*
OPTIONAL
OPTIONAL
SHDN FOR MAX1740 ONLY
DDRV FOR MAX1741 ONLY
R
1M
Applications Information
C
100pF
C s
_______________________________________________________________________________________
IN
DV
RIN
CIN
DATA
DDRV*
3/5
SHDN
SHDN*
CC
CXN
SIM/Smart Card Interface
MAX1686H
MAX1686
MAX1740
MAX1741
STORAGE
CAPACITOR
RESISTANCE
DISCHARGE
1500Ω
R
D
CXP
PGND
GND
OUT
CLK
GND
V
RST
CC
IO
SIM/Smart Card Level Translators
3.0V OR 5.0V
RST
CLK
IO
GND
V
CC
SIM OR
SMART
CARD
DEVICE
UNDER
TEST
The MAX1740/MAX1741 are also useful as 3V/5V level
shifters in SPI, QSPI, and MICROWIRE applications
(Figure 5). 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.
Figure 3b. Human Body Model Current Waveform
Figure 5. MAX1740/MAX1741 with SPI/QSPI/MICROWIRE
Interfaces
TRANSISTOR COUNT: 114
___________________Chip Information
AMPERES
CONTROLLER
SYSTEM
GND
+5.0V
I
P
DV
36.8%
100%
90%
10%
CC
0
*
0
OPTIONAL
OPTIONAL
SHDN FOR MAX1740 ONLY
DDRV FOR MAX1741 ONLY
t
RL
SPI/QSPI/MICROWIRE Interface
IN
DV
RIN
CIN
DATA
DDRV*
SHDN
SHDN*
CC
MAX8867
MAX8860
MAX1740
MAX1741
CURRENT WAVEFORM
TIME
t
DL
PGND
I r
CLK
GND
OUT
V
RST
SET
CC
IO
in µMAX
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
+3.3V
DOUT
DIN
GND
V
CS
SCLK
MICROWIRE
CC
SPI/QSPI/
SYSTEM
9