ncn6011 ON Semiconductor, ncn6011 Datasheet - Page 8

• Manufacturer Part Number: ncn6011
• Description: Low Power Level Shifter
• Manufacturer: ON Semiconductor

Level Shifters
voltage between the external MPU and the SIM card.
Neither the logic nor the functions of the SIM signals are
affected by the interface.
it detect the overload current.
Bidirectional Level Shifter
the MPU and the Smart Card I/O signals. When the start
sequence is completed, and if no failures have been detected,
the device becomes essentially transparent for the data
transferred on the I/O line. To fulfill the ISO7816−3
specification, both sides of the I/O line have built−in pulsed
circuitry to accelerate the signal rise transient. The I/O line
is connected on both sides of the interface by a NMOS
switch which provide the level shifter and, thanks to its
relative high internal impedance, protects the Smart Card in
the event of data collision. Such a situation could occur if
either the MPU of the smart card forces a signal in the
opposite logic level direction.
The built−in level shifters accommodate the differential
The NCN6011 does not regulate the SIM_VCC, nor does
The NCN6011 carries out the voltage difference between
SIM_IO
I/O
Figure 8. Typical I/O and SIM_IO Waveform,
V
DD
= V
CC
= 5.0 V, ENABLE = Low
http://onsemi.com
8
I/O CONTROL
V
I/O
DD
20 k
ENABLE
Figure 9. Typical SIM_IO Activated by ENABLE
SIM_IO
ENABLE
Figure 7. Basic Internal I/O Level Shifter
Q1
Pin, I/O = High (open drain)
200 ns
LOGIC
GND
200 ns
Q2
GND
Q5
20 k
SIM_IO
V
CC