LTC1955 Linear Technology, LTC1955 Datasheet - Page 5

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

TYPICAL PERFOR A CE CHARACTERISTICS
180
160
140
120
100
5V/DIV
5V/DIV
5V/DIV
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80
10
I/O A
V
V
9
8
7
6
5
4
3
2
1
0
–40
CPO
CCA
10
V
Threshold vs Temperature
V
[I
vs Load Current
CCX
V
T
BATT
BATT
Charge Pump and LDO Activation
V
V
A
BATT
BATT
CPO
= 25 C
Overcurrent Shutdown
–15
= 3.1V
= 5.75V
100
Quiescent Current
– 2 (I
= 3.3V
TEMPERATURE ( C)
LOAD CURRENT (A)
CCA
10
V
V
V
1m
CCX
CCX
CCX
+ I
1ms/DIV
CCB
= 1.8V
= 3V
= 5V
35
)]
10m
W
60
1955 G04
100m
1955 G07
1955 G10
U
85
60
55
50
45
40
35
30
25
5V/DIV
5V/DIV
5V/DIV
5V/DIV
3.0
2.5
2.0
1.5
1.0
0.5
RST A
CLK A
I/O A
V
0
2.7
CCA
2.7
Card Detection Debounce Time vs
V
V
Supply Voltage
BATT
Deactivation Sequence
BATT
V
3.1
DVCC
3.1
Supply Voltage
V
Shutdown Current vs
V
BATT
= V
BATT
3.5
3.5
BATT
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
3.9
3.9
T
A
10 s/DIV
= 25 C
4.3
4.3
T
T
T
A
A
A
T
T
= 85 C
= 25 C
= –40 C
4.7
A
A
4.7
= –40 C
= 85 C
5.1
5.1
1955 G05
1955 G11.eps
1955 G08
5.5
5.5
2V/DIV
2V/DIV
DATA
I/O A
0.16
0.14
0.12
0.10
0.08
0.06
1.0
0.8
0.6
0.4
0.2
0
–40
2.7
Bidirectional Channel (I/O A, I/O B)
Low Output Level vs Temperature
Data – I/O Channel, C
DV
Voltage
V
I
V
V
OL
CC
DVCC
DATA
BATT
3.1
= –1mA
–15
Shutdown Current vs Supply
V
= 2.7V
= 0V
= V
DVCC
3.5
BATT
TEMPERATURE ( C)
SUPPLY VOLTAGE (V)
10
3.9
100ns/DIV
LTC1955
4.3
V
V
V
35
CCX
CCX
CCX
T
T
A
A
L
= –40 C
= 25 C, 85 C
= 1.8V
= 3V
= 5V
4.7
= 50pF
sn1955 1955fs
60
5.1
1955 G09
1955 G06
1955 G12
5
5.5
85