LTC1955 Linear Technology, LTC1955 Datasheet - Page 4

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

LTC1955
temperature range, otherwise specifications are at T
PARAMETER
FAULT
Low Level Output Voltage (V
Leakage Current
SYMBOL PARAMETER
Serial Port Timing
t
t
t
t
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: This specification applies to all three smart card voltage classes:
1.8V, 3V and 5V.
Note 3: R
(I
ELECTRICAL CHARACTERISTICS
4
TYPICAL PERFOR A CE CHARACTERISTICS
DS
t
t
t
t
LW
CL
LC
DH
DD
L
H
CCA
600
500
400
300
200
100
www.DataSheet4U.com
0
+ I
2.7
No Load Supply Current vs V
CCB
OLCP
T
I
CCA
D
D
D
SCLK Low Time
SCLK High Time
LD Pulse Width
SCLK to LD
LD to SCLK
A
) and minimum supply voltage V
3.1
IN
IN
OUT
= 25 C
= I
Valid to SCLK Setup
Valid to SCLK Hold
CCB
Output Delay
(2V
3.5
SUPPLY VOLTAGE (V)
= 0 A
V
V
BATT
CCA
CCA
3.9
= V
= 1.8V, V
– V
CCB
OL
4.3
CPO
)
= 5V
)/I
CCB
4.7
CPO
= 0V
W
; V
5.1
BATT
CPO
1955 G01
BATT
will depend upon total load
U
5.5
CONDITIONS
Sink Current = – 200 A
V
CONDITIONS
C
. See Figure 6.
FAULT
LOAD
= 15pF
= 5.5V
6.0
5.5
5.0
4.5
4.0
3.5
–40
I/O X Short-Circuit Current vs
Temperature
A
= 25 C. V
DV
V
CCX
CC
–15
= 5V
The
= V
BATT
TEMPERATURE ( C)
PVBATT
= 5.5V
10
denotes the specifications which apply over the full operating
Note 4: The LTC1955E is guaranteed to meet performance specifications
from 0 C to 70 C. Specifications over the – 40 C to 85 C operating
ambient temperature range are assured by design, characterization and
correlation with statistical process controls.
= V
35
SVBATT
60
= 3.3V, DV
1955 G02
85
CC
= 3.3V unless otherwise noted.
7.0
6.5
6.0
5.5
5.0
4.5
MIN
MIN
15
50
50
50
50
8
8
0
–40
Charge Pump Open-Loop Output
Resistance vs Temperature
(2V
V
V
IN
CPO
IN
= 2.7V
–15
– V
= 4.9V
0.005
CPO
TYP
TYP
TEMPERATURE ( C)
) / I
10
LOAD(MAX)
35
MAX
MAX
0.3
60
1
sn1955 1955fs
60
1955 G03
UNITS
UNITS
85
ns
ns
ns
ns
ns
ns
ns
ns
V
A