LTC1756_15 Datasheet, PDF (4/16 Pages) Linear Technology – Smart Card Interface

LTC1755/LTC1756
ELECTRICAL CHARACTERISTICS _{The q denotes specifications which apply over the full specified}
temperature range, otherwise specificatons are at T_A = 25°C. DV_CC = 2V to 5.5V, unless otherwise noted (Note 4).
PARAMETER
CONDITIONS
Controller Inputs/Outputs DATA, AUX1IN, AUX2IN, DV_CC = 3V
High Input Voltage Threshold (V_IH)
(Note 4)
Low Input Voltage Threshold (V_IL)
(Note 4)
High Level Output Voltage (V_OH)
Source Current = 20µA (Note 4)
Low Level Output Voltage (V_OL)
Sink Current = – 500µA (Note 3)
Output Rise/Fall Time
Loaded with 30pF, 10% to 90%
Input Current (I_IH/I_IL)
RIN, CIN, PWR, CS, 5V/3V, NC/NO
CS = DV_CC
High Input Voltage Threshold (V_IH)
Low Input Voltage Threshold (V_IL)
Input Current (I_IH/I_IL)
READY, ALARM, CARD
(Note 4)
(Note 4)
Pull-Up Current (I_OH)
Low Level Output Voltage (V_OL)
Sink Current = – 20µA
Smart Card Inputs/Outputs I/O, AUX1, AUX2, V_CC = 3V or 5V
High Input Voltage Threshold (V_IH)
I_IH(MAX) = ±20µA
Low Input Voltage Threshold (V_IL)
I_IL(MAX) = 1mA
High Level Output Voltage (V_OH)
Source Current = 20µA
DATA, AUX1IN, AUX2IN = DV_CC
Low Level Output Voltage (V_OL)
Sink Current = – 1mA
DATA, AUX1IN, AUX2IN = 0V (Note 3)
Rise/ Fall Time
Loaded with 30pF, 10% to 90%
Short-Circuit Current
CLK
Shorted to V_CC
High Level Output Voltage (V_OH)
Low Level Output Voltage (V_OL)
CLK Rise/Fall Time
Source Current = 100µA
Sink Current = – 200µA
CLK Loaded with 30pF
CLK Frequency
CLK Loaded with 30pF
RST
High Level Output Voltage (V_OH)
Source Current = 200µA
Source Current = 50µA
Low Level Output Voltage (V_OL)
RST Rise/Fall Time
Sink Current = – 200µA
Loaded with 30pF, 10% to 90%
PRES
High Input Voltage Threshold (V_IH)
Low Input Voltage Threshold (V_IL)
PRES Pull-Up Current
PRES Debounce Time
(Note 4)
(Note 4)
V_PRES = 0V
Proportional to the 0.68µF Charge Pump Capacitor
MIN
TYP
MAX
UNITS
q DV_CC – 0.6 0.5 • DV_CC
V
q
0.5 • DV_CC 0.3
V
q 0.7 • DV_CC
V
q
0.3
V
q
0.5
µs
q
–1
1
µA
q 0.7 • DV_CC 0.5 • DV_CC
V
q
0.5 • DV_CC 0.2 • DV_CC
V
q
–1
1
µA
q 250
q
nA
0.3
V
q 0.6 • V_CC 0.5 • V_CC
V
q
0.5 • V_CC
0.8
V
q 0.8 • V_CC
V
q
0.3
V
q
0.5
µs
q
3.5
7.5
mA
q V_CC – 0.5
q
q
q
5
V
0.3
V
16
ns
MHz
q 0.8 • V_CC
q V_CC – 0.5V
q
q
V
V
0.3
V
0.5
µs
q 0.7 • DV_CC 0.5 • DV_CC
V
q
0.5 • DV_CC 0.2 • DV_CC
V
q
0.5
1
µA
q
40
80
ms
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1755/LTC1756 are guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the – 40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: The DATA, AUX1IN, AUX2IN, AUX1, AUX2 and I/O pull-down
drivers must sink up to 250µA sourced by the internal current sources.
Note 4: On the LTC1756, DV_CC is internally connected to the V_IN pin.
Specifications that call out DV_CC should be referred to V_IN instead.
4