Operating Temperature Range (Note 4).... –40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range................... –65°C to 125°C
SYNC
SCLK
CPO
DATA
D
OUT
R
IN
D
IN
32 31 30 29 28 27 26 25
DV
CC
1
PRES A 2
C8A 3
C4A 4
I/O A 5
RST A 6
CLK A 7
V
CCA
8
9 10 11 12 13 14 15 16
SV
BATT
PV
BATT
SGND
PGND
NC
–
+
LD
24
FAULT
23
UNDERV
22 NC/NO
21 PRES B
20 I/O B
19 RST B
18 CLK B
17 V
CCB
33
SGND
UH PACKAGE
32-LEAD (5mm
×
5mm) PLASTIC QFN
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
LTC1955EUH#PBF
LTC1955IUH#PBF
LEAD BASED FINISH
LTC1955EUH
LTC1955IUH
TAPE AND REEL
LTC1955EUH#TRPBF
LTC1955IUH#TRPBF
TAPE AND REEL
LTC1955EUH#TR
LTC1955IUH#TR
PART MARKING*
1955
1955
PART MARKING*
1955
1955
PACKAGE DESCRIPTION
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
PACKAGE DESCRIPTION
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–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
Input Power Supply
V
BATT
Operating Voltage
I
PVBATT
+ I
SVBATT
Operating Current
I
PVBATT
+ I
SVBATT
Shutdown Current
DV
CC
Operating Voltage
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.
CONDITIONS
l
C
MIN
2.7
C
TYP
MAX
5.5
UNITS
V
µA
µA
µA
V
1955fd
V
CCA
= 5V, V
CCB
= 0V, I
CCA
= 0µA
V
CCA
= V
CCB
= 5V, I
CCA
= I
CCB
= 0µA
No Cards Present. V
CPO
= 0V
l
l
l
l
250
350
0.75
1.7
400
500
1.75
5.5
2
For more information
www.linear.com/LTC1955
LTC1955
elecTrical characTerisTics
PARAMETER
I
DVCC
Operating Current
I
DVCC
Shutdown Current
Charge Pump
R
OLCP
5V Mode Open-Loop Output Resistance
CPO Turn-On Time
Smart Card Supplies V
CCA
, V
CCB
V
CCA/B
Output Voltage
V
CCA/B
Turn-On Time
Undervoltage Detection
Overcurrent Detection
Smart Card Detection
Debounce Time (
Deactivation Time (
CLK A, CLK B
Low Level Output Voltage (V
OL
), (Note 2)
High Level Output Voltage (V
OH
), (Note 2)
Rise/Fall Time (Note 2)
CLK A, CLK B Frequency (Note 2)
RST A, RST B, C4A, C8A
Low Level Output Voltage (V
OL
), (Note 2)
High Level Output Voltage (V
OH
), (Note 2)
Rise/Fall Time (Note 2)
I/O A, I/O B
Low Level Output Voltage (V
OL
), (Note 2)
High Level Output Voltage (V
OH
), (Note 2)
Rise/Fall Time (Note 2)
Short-Circuit Current (Note 2)
DATA
Low Level Output Voltage (V
OL
)
High Level Output Voltage (V
OH
)
Rise/Fall Time
R
IN
, D
IN
, SCLK,
LD,
SYNC, ASYNC, NC/NO
Low Input Threshold (V
IL
)
High Input Threshold (V
IH
)
Input Current (I
IH
/I
IL
)
l
l
l
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.
CONDITIONS
l
l
MIN
TYP
10
0.5
5.7
0.6
MAX
25
1.5
8.5
1.5
5.35
3.25
1.95
1.5
–2.5
135
60
2.5
250
0.2
UNITS
µA
µA
Ω
ms
V
V
V
ms
%
mA
ms
µA
µs
V
V
ns
MHz
V
BATT
= 3.075V, I
CPO
= I
CCA
+ I
CCB
= 120mA (Note 3)
l
I
CCA/B
= 0mA, 10% to 90%
5V Mode, 0 < I
CCA/B
< 60mA
3V Mode, 0 < I
CCA/B
< 50mA
1.8V Mode, 0 < I
CCA/B
< 30mA
I
CCA/B
= 0mA, 10% to 90%
Relative to Nominal Output
5V Mode
l
l
l
l
l
l
l
4.65
2.75
1.65
–9
65
20
5
3
1.8
0.8
–5
100
35
1.25
20
PRES A/B to
D15/D7)
V
NC/NO
= 0V
V
PRESA/B
= 0
I
CCA/B
= 0mA, C
VCCA/B
= 1µF
Sink Current = –200µA
Source Current = 200µA
Loaded with 50pF 10% to 90%
,
l
l
l
PRES A, PRES B Pull-Up Current
RST to V
CC
= 0.4V)
l
l
l
l
V
CCA/B
– 0.2
16
10
0.2
V
CCA/B
– 0.2
100
0.3
0.85 • V
CCA/B
500
5
10
0.3
0.8 • DV
CC
500
0.15 • DV
CC
0.85 • DV
CC
–1
1
Sink Current = –200µA
Source Current = 200µA
Loaded with 50pF 10% to 90%
,
Sink Current = –1mA (V
DATA
= 0V)
Source Current = 20µA (V
DATA
= V
DVCC
)
Loaded with 50pF 10% to 90%
,
V
DATA
= 0V
Sink Current = –500µA (V
I/OA/B
= 0V)
Source Current = 20µA (V
I/OA/B
= V
CCA/B
)
Loaded with 50pF 10% to 90%
,
l
l
l
V
V
ns
V
V
ns
mA
V
V
ns
V
V
µA
l
l
l
l
l
l
l
1955fd
For more information
www.linear.com/LTC1955
3
LTC1955
elecTrical characTerisTics
PARAMETER
D
OUT
Low Level Output Voltage (V
OL
)
High Level Output Voltage (V
OH
)
UNDERV
Threshold
Leakage Current
FAULT
Low Level Output Voltage (V
OL
)
Leakage Current
SYMBOL
Serial Port Timing
t
DS
t
DH
t
DD
t
L
t
H
t
CL
t
LC
t
LFC
D
IN
Valid to SCLK Setup
D
IN
Valid to SCLK Hold
D
OUT
Output Delay
SCLK Low Time
SCLK High Time
SCLK to
LD
LD
to SCLK
LD
Falling to SCLK
C
LOAD
= 15pF
l
l
l
l
l
l
l
l
l
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.
CONDITIONS
Sink Current = –200µA
Source Current = 200µA
l
l
MIN
TYP
MAX
0.3
UNITS
V
V
DV
CC
– 0.3
1.17
1.23
1.29
50
0.005
0.3
1
MIN
8
8
15
50
50
50
0
50
60
TYP
MAX
V
nA
V
µA
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
V
UNDERV
= 3.3V
Sink Current = –200µA
V
FAULT
= 5.5V
PARAMETER
CONDITIONS
l
l
l
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
This specification applies to all three smart card voltage classes:
1.8V, 3V and 5V.
Note 3:
R
OLCP
@
(2V
BATT
– V
CPO
)/I
CPO
; V
CPO
will depend upon total load
(I
CCA
+ I
CCB
) and minimum supply voltage V
BATT
. See Figure 5.
Note 4:
The LTC1955E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
ambient temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC1955I is guaranteed to
meet performance specifications over the full –40°C to 85°C temperature
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Embedded System
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