LTC1955EUH Linear Technology, LTC1955EUH Datasheet - Page 4

• Manufacturer Part Number: LTC1955EUH
• Description: IC INTERFACE DL SMART CARD 32QFN
• Manufacturer: Linear Technology

Specifications of LTC1955EUH

• Controller Type: Smart Card Interface
• Interface: 4-Wire Serial
• Voltage - Supply: 1.7 V ~ 5.5 V
• Current - Supply: 10µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1955
ELECTRICAL CHARACTERISTICS
PARAMETER
D
Low Level Output Voltage (V
High Level Output Voltage (V
UNDERV
Threshold
Leakage Current
FAULT
Low Level Output Voltage (V
Leakage Current
SYMBOL
Serial Port Timing
t
t
t
t
t
t
t
t
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 specifi cation applies to all three smart card voltage classes:
1.8V, 3V and 5V.
Note 3: R
(I
4
temperature range, otherwise specifi cations are at T
DS
DH
DD
L
H
LW
CL
LC
OUT
CCA
+ I
CCB
OLCP
) and minimum supply voltage V
≅ (2V
BATT
PARAMETER
D
D
D
SCLK Low Time
SCLK High Time
LD Pulse Width
SCLK to LD
LD to SCLK
IN
IN
OUT
– V
Valid to SCLK Setup
Valid to SCLK Hold
Output Delay
CPO
OL
OL
OH
)
)
)
)/I
CPO
; V
CPO
BATT
will depend upon total load
. See Figure 5.
CONDITIONS
Sink Current = –200μA
Source Current = 200μA
V
Sink Current = –200μA
V
UNDERV
FAULT
= 5.5V
A
= 3.3V
= 25°C. V
CONDITIONS
C
LOAD
The
= 15pF
l
PVBATT
denotes the specifi cations which apply over the full operating
Note 4: The LTC1955E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations 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 specifi cations over the full –40°C to 85°C temperature
range.
= V
SVBATT
= 3.3V, DV
CC
l
l
l
l
l
l
l
l
l
l
l
l
l
l
= 3.3V, unless otherwise noted.
DV
MIN
CC
15
50
50
50
50
1.17
MIN
8
8
0
– 0.3
0.005
TYP
1.23
TYP
MAX
1.29
0.3
0.3
MAX
50
1
60
UNITS
UNITS
1955fb
nA
μA
ns
ns
ns
ns
ns
ns
ns
ns
V
V
V
V