LTC1955 Linear Technology, LTC1955 Datasheet - Page 3

• Manufacturer Part Number: LTC1955
• Description: Dual Smart Card Interface
• Manufacturer: Linear Technology

temperature range, otherwise specifications are at T
SYMBOL
Smart Card Supplies V
V
V
Undervoltage Detection
Overcurrent Detection
Smart Card Detection
Debounce Time (
PRES A, PRES B Pull-Up Current
Deactivation Time (
CLK A, CLK B
Low Level Output Voltage (V
High Level Output Voltage (V
Rise/Fall Time, (Note 2)
CLK A, CLK B Frequency, (Note 2)
RST A, RST B, C4A, C8A
Low Level Output Voltage (V
High Level Output Voltage (V
Rise/Fall Time, (Note 2)
I/O A, I/O B
Low Level Output Voltage (V
High Level Output Voltage (V
Rise/Fall Time, (Note 2)
Short Circuit Current, (Note 2)
DATA
Low Level Output Voltage (V
High Level Output Voltage (V
Rise/Fall Time
R
Low Input Threshold (V
High Input Threshold (V
Input Current (I
D
Low Level Output Voltage (V
High Level Output Voltage (V
UNDERV
Threshold
Leakage Current
ELECTRICAL CHARACTERISTICS
CCA/B
CCA/B
IN
OUT
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, D
IN
Output Voltage
Turn On-Time
, SCLK, LD, SYNC, ASYNC, NC/NO
IH
/I
IL
PRES A/B to
)
RST to V
CCA
IL
IH
)
)
, V
OL
OL
OL
OL
OL
OH
OH
OH
OH
OH
CCB
), (Note 2)
), (Note 2)
), (Note 2)
)
)
), (Note 2)
), (Note 2)
), (Note 2)
)
)
CC
= 0.4V)
D15/D7) V
CONDITIONS
5V Mode, 0 < I
3V Mode, 0 < I
1.8V Mode, 0 < I
I
Relative to Nominal Output
5V Mode
V
I
Sink Current = – 200 A
Source Current = 200 A
Loaded with 50pF, 10% to 90%
Sink Current = – 200 A
Source Current = 200 A
Loaded with 50pF, 10% to 90%
Sink Current = –1mA (V
Source Current = 20 A (V
Loaded with 50pF, 10% to 90%
Sink Current = – 500 A (V
Source Current = 20 A (V
Loaded with 50pF, 10% to 90%
Sink Current = – 200 A
Source Current = 200 A
V
CCA/B
CCA/B
V
NC/NO
PRESA/B
UNDERV
DATA
= 0mA, 10% to 90%
= 0mA, C
= 0V
= 0V
= 3.3V
= 0
A
CCA/B
CCA/B
= 25 C. V
VCCA/B
CCA/B
The
< 60mA
< 50mA
< 30mA
= 1 F
DATA
DATA
I/OA/B
PVBATT
I/OA/B
denotes the specifications which apply over the full operating
= 0V)
= V
= V
= 0V)
= V
DVCC
CCA/B
SVBATT
)
)
= 3.3V, DV
CC
0.85 • V
V
V
0.85 • DV
DV
0.8 • DV
CCA/B
CCA/B
= 3.3V unless otherwise noted.
CC
4.65
2.75
1.65
1.17
MIN
– 9
65
20
10
–1
– 0.3
– 0.2
– 0.2
CCA/B
CC
CC
1.25
1.23
TYP
100
5.0
3.0
1.8
0.8
– 5
35
20
5
LTC1955
0.15 • DV
MAX
5.35
3.25
1.95
– 2.5
1.29
135
250
100
500
500
1.5
2.5
0.2
0.2
0.3
0.3
0.3
60
16
10
50
1
sn1955 1955fs
CC
UNITS
3
MHz
mA
mA
ms
ms
nA
ns
ns
ns
ns
%
V
V
V
A
V
V
V
V
V
V
V
V
V
V
A
V
V
V
s