LTC1955_15 Datasheet, PDF (4/22 Pages) Linear Technology – Dual Smart Card Interface with Serial Control

LTC1955
Electrical Characteristics 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.
PARAMETER
CONDITIONS
MIN
TYP MAX
UNITS
D_OUT
Low Level Output Voltage (V_OL)
High Level Output Voltage (V_OH)
Sink Current = –200µA
Source Current = 200µA
l
l DV_CC – 0.3
0.3
V
V
UNDERV
Threshold
l
1.17
1.23 1.29
V
Leakage Current
FAULT
V_UNDERV = 3.3V
l
50
nA
Low Level Output Voltage (V_OL)
Sink Current = –200µA
l
0.005 0.3
V
Leakage Current
V_FAULT = 5.5V
l
1
µA
SYMBOL
Serial Port Timing
t_DS
t_DH
t_DD
t_L
t_H
t_CL
t_LC
t_LFC
PARAMETER
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
CONDITIONS
C_LOAD = 15pF
MIN
TYP
MAX UNITS
l
8
l
8
l 15
l 50
l 50
l 50
l
0
l 50
ns
ns
60
ns
ns
ns
ns
ns
ns
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
range.
1955fd
4
For more information www.linear.com/LTC1955