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NCN4557MTR2G

P1-P3P4-P6P7-P9P10-P12
NCN4557
http://onsemi.com
7
CARD INTERFACE SECTION (−40°C to +85°C)
Pin Symbol Rating Min Typ Max Unit
6,15 CRD_RSTA
CRD_RSTB
CRD_V
CC
= +3 V
Output RESET V
OH
@ ICRD_rst = −20 mA
Output RESET V
OL
@ ICRD_rst = +200 mA
Output RESET Rise Time @ C
out
= 30 pF
Output RESET Fall Time @ C
out
= 30 pF
CRD_V
CC
= +1.8 V
Output RESET V
OH
@ ICRD_rst = −20 mA
Output RESET V
OL
@ ICRD_rst = +200 mA
Output RESET Rise Time @ C
out
= 30 pF
Output RESET Fall Time @ C
out
= 30 pF
0.9 * CRD_V
CC
0
0.9 * CRD_V
CC
0
CRD_V
CC
0.3
0.8
0.8
CRD_V
CC
0.3
0.8
0.8
V
V
ms
ms
V
V
ms
ms
5,16 CRD_CLKA
CRD_CLKB
CRD_V
CC
= +3 V
Output Duty Cycle
Max Output Frequency
Output V
OH
@ ICRD_clk = −20 mA
Output V
OL
@ ICRD_clk = +200 mA
Output CRD_CLK Rise Time @ C
out
= 30 pF
Output CRD_CLK Fall Time @ C
out
= 30 pF
CRD_V
CC
= +1.8 V
Output Duty Cycle
Max Output Frequency
Output V
OH
@ ICRD_clk = −20 mA
Output V
OL
@ ICRD_clk = +200 mA
Output CRD_CLK Rise Time @ C
out
= 30 pF
Output CRD_CLK Fall Time @ C
out
= 30 pF
40
5
0.9 * CRD_V
CC
0
40
5
0.9 * CRD_V
CC
0
60
CRD_V
CC
0.3
18
18
60
CRD_V
CC
0.3
18
18
%
MHz
V
V
ns
ns
%
MHz
V
V
ns
ns
7,14 CRD_I/OA
CRD_I/OB
CRD_V
CC
= +3 V
Output V
OH
@ I
CRD_IO
= −20 mA, V
I/O
=V
DD
Output V
OL
@ I
CRD_IO
= +1 mA, V
I/O
= 0V
CRD_I/O Rise Time @ C
out
= 30pF
CRD_I/O Fall Time @ C
out
= 30 pF
CRD_V
CC
= +1.8 V
Output V
OH
@ I
CRD_IO
= −20 mA, V
I/O
= V
DD
Output V
OL
@ I
CRD_IO
= +1 mA, V
I/O
= 0 V
CRD_I/O Rise Time @ C
out
= 30 pF
CRD_I/O Fall Time @ C
out
= 30 pF
Short−Circuit Current, V
I/O
= 0 V
0.8 * CRD_V
CC
0
0.8 * CRD_V
CC
0
4
CRD_V
CC
0.4
0.8
0.8
CRD_V
CC
0.3
0.8
0.8
15
V
V
ms
ms
V
V
ms
ms
mA
8 R
pu_CRD_I/O
Card I/O Pullup Resistor 10 14 18 kW
NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit
board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are guaranteed only over the declared operating
temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are
applied individually under normal operating conditions and not valid simultaneously.
3. All the dynamic specifications (AC specifications) are guaranteed by design over the operating temperature range.
NCN4557
http://onsemi.com
8
TYPICAL CHARACTERISTICS
Figure 4. I
BAT
Operating Current vs. V
BAT
,
T
A
= 25°C, I
CC
= 0 mA
Figure 5. I
BAT
Shutdown Current vs. V
BAT
V
BAT
(V) V
BAT
(V)
5.55.14.74.33.93.53.12.7
20
22
24
26
28
30
5.55.14.74.33.93.53.12.7
0
0.2
0.4
0.6
0.8
1.0
1.2
Figure 6. IV
DD
Shutdown Current vs. V
DD
,
T
A
= 25°C, V
BAT
= 5.5 V
Y AXIS LABEL (UNIT)
5.85.45.03.83.42.62.21.8
0
10
20
30
40
50
Figure 7. Activation Sequence, Ch1 : CRD_V
CC
,
Ch2 : CRD_IO, Ch4 : CRD_RST, Ch3 : CRD_CLK
Figure 8. Automatic Deactivation
Ch4: CRD_RST, Ch3: CRD_CLK, Ch2: CRD_IO,
Ch1: CRD_V
CC
I
BAT
(mA)
Drop−out
CRD_V
CC
A/B = 3.0 V
CRD_V
CC
A/B = 1.8 V
I
BAT_SD
(mA)
−40°C
25°C
85°C
3.0 4.2 4.6
IV
DD_SD
(nA)
NCN4557
http://onsemi.com
9
APPLICATION INFORMATION
The NCN4557 is a dual LDO−based DC/DC converter
and level shifter able to handle independently 2 smart card
interfaces. When one of these interfaces is operating the
other one is not active and conversely. Class B (3.0 V) and
C (1.8 V) cards can be used.
The Card and the CRD_V
CC
power supply are selected
using the pins SEL0, SEL1 and ENABLE according to
Table 1.
Table 1. CARD AND CRD_V
CC
SELECTION
ENABLE SEL1 SEL0 Card# / CRD_V
CC
1 0 0 Card A / 1.8 V
1 0 1 Card A / 3.0 V
1 1 0 Card B / 1.8 V
1 1 1 Card B / 3.0 V
0 X X A & B Disabled
Card Supply Converter
The built−it NCN4557 DC/DC converters are Low
Drop−Out Voltage Regulators capable to supply a current
in excess of 50 mA under 1.8 V or 3.0 V. These voltages are
selected according to Table 1. Using the Boolean input
ENABLE pin the NCN4557 device can be disabled setting
the circuit in a shutdown mode for which the power
consumption features values typically in the range of a few
tens of nA. Figure 9 shows a simplified view of the
NCN4557 voltage regulator. The CRD_V
CC
output is
internally current limited and protected against short
circuits. The short−circuit current IV
CC
varies with V
BAT
typically in the range of 30 mA to 60 mA.
In order to guarantee a stable and satisfying operating of
the LDO the CRD_V
CC
output will be connected to a
1.0 mF bypass ceramic capacitor to the ground. At the
input, V
BAT
will be bypassed to the ground with a 0.1 mF
ceramic capacitor.
GND
I
lim
+
−
+
ENABLE
V
BAT
CRD_V
CC
R1
R2
Q1
C
in
= 0.1 mF
Cout = 1.0 mF
V
ref
Figure 9. Simplified Block Diagram of the LDO
Voltage Regulator
Level Shifters
The level shifters accommodate the voltage difference
that might exist between the microcontroller and the smart
card. The RESET and CLOCK level shifters are
mono−directional and feature both the same architecture.
The bidirectional I/O line provides a way to
automatically adapt the voltage difference between the
controller and the card in both directions. In addition with
the pull−up resistor, a dynamic pullup circuit (Figure 10,
Q1 and Q2) provides a fast charge of the stray capacitance,
yielding a rise time fully within the ISO7816, EMV and
GSM specifications.
P1-P3P4-P6P7-P9P10-P12

NCN4557MTR2G

Mfr. #:
Buy NCN4557MTR2G
Manufacturer:
ON Semiconductor
Description:
Translation - Voltage Levels ANA DUAL SMART CARD INT
Lifecycle:
New from this manufacturer.
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