Datasheet

4
LTC1755/LTC1756
The ● 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).
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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Controller Inputs/Outputs DATA, AUX1IN, AUX2IN, DV
CC
= 3V
High Input Voltage Threshold (V
IH
) (Note 4) ● DV
CC
– 0.6 0.5 • DV
CC
V
Low Input Voltage Threshold (V
IL
) (Note 4) ● 0.5 • DV
CC
0.3 V
High Level Output Voltage (V
OH
) Source Current = 20µA (Note 4) ● 0.7 • DV
CC
V
Low Level Output Voltage (V
OL
) Sink Current = –500µA (Note 3) ● 0.3 V
Output Rise/Fall Time Loaded with 30pF, 10% to 90% ● 0.5 µs
Input Current (I
IH
/I
IL
) CS = DV
CC
● –1 1 µA
RIN, CIN, PWR, CS, 5V/3V, NC/NO
High Input Voltage Threshold (V
IH
) (Note 4) ● 0.7 • DV
CC
0.5 • DV
CC
V
Low Input Voltage Threshold (V
IL
) (Note 4) ● 0.5 • DV
CC
0.2 • DV
CC
V
Input Current (I
IH
/I
IL
) ● –1 1 µA
READY, ALARM, CARD
Pull-Up Current (I
OH
) ● 250 nA
Low Level Output Voltage (V
OL
) Sink Current = –20µA ● 0.3 V
Smart Card Inputs/Outputs I/O, AUX1, AUX2, V
CC
= 3V or 5V
High Input Voltage Threshold (V
IH
)I
IH(MAX)
= ±20µA ● 0.6 • V
CC
0.5 • V
CC
V
Low Input Voltage Threshold (V
IL
)I
IL(MAX)
= 1mA ● 0.5 • V
CC
0.8 V
High Level Output Voltage (V
OH
) Source Current = 20µA ● 0.8 • V
CC
V
DATA, AUX1IN, AUX2IN = DV
CC
Low Level Output Voltage (V
OL
) Sink Current = –1mA ● 0.3 V
DATA, AUX1IN, AUX2IN = 0V (Note 3)
Rise/ Fall Time Loaded with 30pF, 10% to 90% ● 0.5 µs
Short-Circuit Current Shorted to V
CC
● 3.5 7.5 mA
CLK
High Level Output Voltage (V
OH
) Source Current = 100µA ● V
CC
– 0.5 V
Low Level Output Voltage (V
OL
) Sink Current = –200µA ● 0.3 V
CLK Rise/Fall Time CLK Loaded with 30pF ● 16 ns
CLK Frequency CLK Loaded with 30pF ● 5 MHz
RST
High Level Output Voltage (V
OH
) Source Current = 200µA ● 0.8 • V
CC
V
Source Current = 50µA
● V
CC
– 0.5V V
Low Level Output Voltage (V
OL
) Sink Current = –200µA ● 0.3 V
RST Rise/Fall Time Loaded with 30pF, 10% to 90% ● 0.5 µs
PRES
High Input Voltage Threshold (V
IH
) (Note 4) ● 0.7 • DV
CC
0.5 • DV
CC
V
Low Input Voltage Threshold (V
IL
) (Note 4) ● 0.5 • DV
CC
0.2 • DV
CC
V
PRES Pull-Up Current V
PRES
= 0V ● 0.5 1 µA
PRES Debounce Time Proportional to the 0.68µF Charge Pump Capacitor ● 40 80 ms
ELECTRICAL CHARACTERISTICS