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LTC1955IUH#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
LTC1955
1
1955fd
For more information www.linear.com/LTC1955
Typical applicaTion
DescripTion
Dual Smart Card Interface
with Serial Control
The LT C
®
1955 provides all necessary supervisory and
power control functions for two smart cards, two S.A.M.
cards or a combination of S.A.M. and smart cards. It
provides a charge pump for battery-powered applications
as well as all necessary level shifting circuitry.
The card voltages can be independently set to 1.8V, 3V or
5V. Both card interfaces include a card detection channel
with automatic debounce circuitry. To reduce wiring costs,
the LTC1955 interfaces to a microcontroller via a simple
4-wire serial interface. Multiple devices may be connected
in daisychain fashion so that the number of wires to the
card socket board is independent of the number of sockets.
Status data is returned over the same interface.
Extensive security features ensure proper deactivation
sequencing in the event of a supply fault or a smart card
electrical fault. The smart card pins can withstand greater
than 10kV ESD in-situ with no additional components.
The LTC1955 is available in a low profile (0.75mm) 5mm
× 5mm QFN package.
Deactivation Sequence
FeaTures
applicaTions
n
Compatible with ISO7816-3 and EMV Electrical
Specifications
n
Power Management and Control for Two Smart Cards
n
Control/Status Serial Port May Be Daisychained for
Multicard Applications
n
Automatic Shutdown on Electrical Faults
n
Buck/Boost Charge Pump Generates 5V, 3V or 1.8V
Outputs (Smart Card Classes A, B and C)
n
Independent 5V/3V/1.8V Level Control for Both Cards
n
Automatic Level Translation
n
Supervisory Functions Prevent Smart Card Faults
n
Low Operating Current: 250µA Typical
n
Ultralow Shutdown Current
n
>10kV ESD on Smart Card Pins
n
Small 32-Lead 5mm × 5mm QFN Package
n
Handheld Payment Terminals
n
Pay Telephones
n
ATM Machines
n
POS Terminals
n
Computer Keyboards
n
Multiple S.A.M. Sockets
10µs/DIV
V
CCA
5V/DIV
I/O A
5V/DIV
CLK A
5V/DIV
RST A
5V/DIV
1955 TA01a
4-WIRE
COMMAND
INTERFACE
4-WIRE
CARD
INTERFACE
SMART CARD
VENDOR CARD
C8A
C4A
I/O A
RST A
CLK A
V
CCA
PRES B
3
4
5
6
7
8
21
2
CARD
DETECT
23
20
19
18
17
151114
24
1
12,13
9, 10
29
30
32
31
22
27
28
26
25
I/O B
RST B
CLK B
V
CCB
DV
CC
V
BATT
GND
FAULT
D
IN
D
OUT
SCLK
LD
DATA
R
IN
SYNC
ASYNC
NC/NO
PRES A
UNDERV
240k
LTC1955
1µF
1µF
4.7µF
1955 TA01b
1µF
4.7µF0.1µF
C
+
C
–
CPO
180k
INPUT
POWER
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6356140, 6411531.
LTC1955
2
1955fd
For more information www.linear.com/LTC1955
pin conFiguraTionabsoluTe MaxiMuM raTings
V
BATT
, DV
CC
, CPO, FAULT,
UNDERV to GND ....................................... –0.3V to 6.0V
PRES A/PRES B, DATA, R
IN
, SYNC, ASYNC,
LD, D
IN
, SCLK to GND .................–0.3V to (DV
CC
+ 0.3V)
I/O A ............................................ –0.3V to (V
CCA
+ 0.3V)
I/O B ............................................ –0.3V to (V
CCB
+ 0.3V)
I
VCCA
/IV
CCB
.............................................................80mA
V
CCA
/V
CCB
Short-Circuit Duration ..................... Indefinite
Operating Temperature Range (Note 4).... –40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
32
33
SGND
31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1DV
CC
PRES A
C8A
C4A
I/O A
RST A
CLK A
V
CCA
FAULT
UNDERV
NC/NO
PRES B
I/O B
RST B
CLK B
V
CCB
SYNC
ASYNC
R
IN
DATA
D
OUT
D
IN
SCLK
LD
SGND
PGND
C
–
SV
BATT
PV
BATT
C
+
CPO
NC
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1955EUH#PBF LTC1955EUH#TRPBF 1955
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC1955IUH#PBF LTC1955IUH#TRPBF 1955
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1955EUH LTC1955EUH#TR 1955
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC1955IUH LTC1955IUH#TR 1955
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Power Supply
V
BATT
Operating Voltage
l
2.7 5.5 V
I
PVBATT
+ I
SVBATT
Operating Current V
CCA
= 5V, V
CCB
= 0V, I
CCA
= 0µA
V
CCA
= V
CCB
= 5V, I
CCA
= I
CCB
= 0µA
l
l
250
350
400
500
µA
µA
I
PVBATT
+ I
SVBATT
Shutdown Current No Cards Present. V
CPO
= 0V
l
0.75 1.75 µA
DV
CC
Operating Voltage
l
1.7 5.5 V
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
PVBATT
= V
SVBATT
= 3.3V, DV
CC
= 3.3V, unless otherwise noted.
LTC1955
3
1955fd
For more information www.linear.com/LTC1955
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
PVBATT
= V
SVBATT
= 3.3V, DV
CC
= 3.3V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
I
DVCC
Operating Current
l
10 25 µA
I
DVCC
Shutdown Current
l
0.5 1.5 µA
Charge Pump
R
OLCP
5V Mode Open-Loop Output Resistance V
BATT
= 3.075V, I
CPO
= I
CCA
+ I
CCB
= 120mA (Note 3)
l
5.7 8.5 Ω
CPO Turn-On Time I
CCA/B
= 0mA, 10% to 90%
l
0.6 1.5 ms
Smart Card Supplies V
CCA
, V
CCB
V
CCA/B
Output Voltage 5V Mode, 0 < I
CCA/B
< 60mA
3V Mode, 0 < I
CCA/B
< 50mA
1.8V Mode, 0 < I
CCA/B
< 30mA
l
l
l
4.65
2.75
1.65
5
3
1.8
5.35
3.25
1.95
V
V
V
V
CCA/B
Turn-On Time I
CCA/B
= 0mA, 10% to 90%
l
0.8 1.5 ms
Undervoltage Detection Relative to Nominal Output
l
–9 –5 –2.5 %
Overcurrent Detection 5V Mode
l
65 100 135 mA
Smart Card Detection
Debounce Time (
PRES A/B to D15/D7)
V
NC/NO
= 0V
l
20 35 60 ms
PRES A, PRES B Pull-Up Current V
PRESA/B
= 0
l
1.25 2.5 µA
Deactivation Time (
RST to V
CC
= 0.4V)
I
CCA/B
= 0mA, C
VCCA/B
= 1µF
l
20 250 µs
CLK A, CLK B
Low Level Output Voltage (V
OL
), (Note 2) Sink Current = –200µA
l
0.2 V
High Level Output Voltage (V
OH
), (Note 2) Source Current = 200µA
l
V
CCA/B
– 0.2 V
Rise/Fall Time (Note 2) Loaded with 50pF, 10% to 90%
l
16 ns
CLK A, CLK B Frequency (Note 2)
l
10 MHz
RST A, RST B, C4A, C8A
Low Level Output Voltage (V
OL
), (Note 2) Sink Current = –200µA
l
0.2 V
High Level Output Voltage (V
OH
), (Note 2) Source Current = 200µA
l
V
CCA/B
– 0.2 V
Rise/Fall Time (Note 2) Loaded with 50pF, 10% to 90%
l
100 ns
I/O A, I/O B
Low Level Output Voltage (V
OL
), (Note 2) Sink Current = –1mA (V
DATA
= 0V)
l
0.3 V
High Level Output Voltage (V
OH
), (Note 2) Source Current = 20µA (V
DATA
= V
DVCC
)
l
0.85 • V
CCA/B
V
Rise/Fall Time (Note 2) Loaded with 50pF, 10% to 90%
l
500 ns
Short-Circuit Current (Note 2) V
DATA
= 0V
l
5 10 mA
DATA
Low Level Output Voltage (V
OL
) Sink Current = –500µA (V
I/OA/B
= 0V)
l
0.3 V
High Level Output Voltage (V
OH
) Source Current = 20µA (V
I/OA/B
= V
CCA/B
)
l
0.8 • DV
CC
V
Rise/Fall Time Loaded with 50pF, 10% to 90%
l
500 ns
R
IN
, D
IN
, SCLK, LD, SYNC, ASYNC, NC/NO
Low Input Threshold (V
IL
)
l
0.15 • DV
CC
V
High Input Threshold (V
IH
)
l
0.85 • DV
CC
V
Input Current (I
IH
/I
IL
)
l
–1 1 µA
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LTC1955IUH#TRPBF

Mfr. #:
Buy LTC1955IUH#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Interface - Specialized 2x Smart Card Int w/ Serial Control
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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