MAX1741 Просмотр технического описания (PDF) - Maxim Integrated
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MAX1741 Datasheet PDF : 12 Pages
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SIM/Smart Card Level Translators
in µMAX
RC
1M
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
RD
1500Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Figure 3a. Human Body ESD Test Model
DEVICE
UNDER
TEST
IP 100%
90%
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPERES
36.8%
10%
0
0 tRL
TIME
tDL
CURRENT WAVEFORM
Figure 3b. Human Body Model Current Waveform
+3.0V
DVCC
CXN
CXP
IN MAX1686 OUT
MAX1686H
3/5
GND
SHDN
PGND
3.0V OR 5.0V
SYSTEM
CONTROLLER
MAX1740
MAX1741
DVCC
VCC
RIN
RST
CIN
CLK
DATA
IO
OPTIONAL
SHDN*
OPTIONAL
DDRV*
GND
GND
* SHDN FOR MAX1740 ONLY
DDRV FOR MAX1741 ONLY
SIM OR
SMART
CARD
VCC
RST
CLK
IO
GND
Figure 4. Using MAX1740/MAX1741 and MAX1686/MAX1686H
Charge Pump for SIM Card Applications
+5.0V
DVCC
+3.3V
IN
OUT
MAX8867 SET
MAX8860
SHDN
PGND
SYSTEM
CONTROLLER
MAX1740
MAX1741
DVCC
VCC
RIN
RST
CIN
CLK
SPI/QSPI/
MICROWIRE
SYSTEM
VCC
CS
SCLK
DATA
IO
OPTIONAL
SHDN*
OPTIONAL
DDRV*
GND
GND
* SHDN FOR MAX1740 ONLY
DDRV FOR MAX1741 ONLY
DOUT
DIN
GND
Figure 5. MAX1740/MAX1741 with SPI/QSPI/MICROWIRE
Interfaces
est, which is then discharged into the test device
through a 1.5kΩ resistor.
Applications Information
SIM/Smart Card Interface
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.
SPI/QSPI/MICROWIRE Interface
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.
___________________Chip Information
TRANSISTOR COUNT: 114
_______________________________________________________________________________________ 9
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