![](http://datasheet.mmic.net.cn/Linear-Technology/LTC1755EGN-TR_datasheet_98014/LTC1755EGN-TR_4.png)
4
LTC1755/LTC1756
The q denotes specifications which apply over the full specified
temperature range, otherwise specificatons are at TA = 25°C. DVCC = 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 250
A sourced by the internal current sources.
Note 4: On the LTC1756, DVCC is internally connected to the VIN pin.
Specifications that call out DVCC should be referred to VIN instead.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Controller Inputs/Outputs DATA, AUX1IN, AUX2IN, DVCC = 3V
High Input Voltage Threshold (VIH)
(Note 4)
q
DVCC – 0.6 0.5 DVCC
V
Low Input Voltage Threshold (VIL)
(Note 4)
q
0.5 DVCC
0.3
V
High Level Output Voltage (VOH)
Source Current = 20
A (Note 4)
q
0.7 DVCC
V
Low Level Output Voltage (VOL)
Sink Current = – 500
A (Note 3)
q
0.3
V
Output Rise/Fall Time
Loaded with 30pF, 10% to 90%
q
0.5
s
Input Current (IIH/IIL)
CS = DVCC
q
–1
1
A
RIN, CIN, PWR, CS, 5V/3V, NC/NO
High Input Voltage Threshold (VIH)
(Note 4)
q
0.7 DVCC 0.5 DVCC
V
Low Input Voltage Threshold (VIL)
(Note 4)
q
0.5 DVCC 0.2 DVCC
V
Input Current (IIH/IIL)
q
–1
1
A
READY, ALARM, CARD
Pull-Up Current (IOH)
q
250
nA
Low Level Output Voltage (VOL)
Sink Current = – 20
A
q
0.3
V
Smart Card Inputs/Outputs I/O, AUX1, AUX2, VCC = 3V or 5V
High Input Voltage Threshold (VIH)IIH(MAX) = ±20A
q
0.6 VCC
0.5 VCC
V
Low Input Voltage Threshold (VIL)IIL(MAX) = 1mA
q
0.5 VCC
0.8
V
High Level Output Voltage (VOH)
Source Current = 20
A
q
0.8 VCC
V
DATA, AUX1IN, AUX2IN = DVCC
Low Level Output Voltage (VOL)
Sink Current = – 1mA
q
0.3
V
DATA, AUX1IN, AUX2IN = 0V (Note 3)
Rise/ Fall Time
Loaded with 30pF, 10% to 90%
q
0.5
s
Short-Circuit Current
Shorted to VCC
q
3.5
7.5
mA
CLK
High Level Output Voltage (VOH)
Source Current = 100
A
q
VCC – 0.5
V
Low Level Output Voltage (VOL)
Sink Current = – 200
A
q
0.3
V
CLK Rise/Fall Time
CLK Loaded with 30pF
q
16
ns
CLK Frequency
CLK Loaded with 30pF
q
5
MHz
RST
High Level Output Voltage (VOH)
Source Current = 200
A
q
0.8 VCC
V
Source Current = 50
A
q
VCC – 0.5V
V
Low Level Output Voltage (VOL)
Sink Current = – 200
A
q
0.3
V
RST Rise/Fall Time
Loaded with 30pF, 10% to 90%
q
0.5
s
PRES
High Input Voltage Threshold (VIH)
(Note 4)
q
0.7 DVCC 0.5 DVCC
V
Low Input Voltage Threshold (VIL)
(Note 4)
q
0.5 DVCC 0.2 DVCC
V
PRES Pull-Up Current
VPRES = 0V
q
0.5
1
A
PRES Debounce Time
Proportional to the 0.68
F Charge Pump Capacitor
q
40
80
ms
ELECTRICAL CHARACTERISTICS