LTC1756 Datasheet, PDF (3/12 Pages) Linear Technology – Smart Card Interface

LTC1756
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full specified
temperature range, otherwise specificatons are at T_A = 25°C. V_IN = 2.7V to 5.5V, unless otherwise noted.
PARAMETER
RIN, CIN, PWR, 5V/3V
High Input Voltage Threshold (V_IH)
Low Input Voltage Threshold (V_IL)
Input Current (I_IH/I_IL)
READY, CARD
Pull-Up Current (I_OH)
Low Level Output Voltage (V_OL)
Smart Card Input/Output I/O, V_CC = 3V or 5V
High Input Voltage Threshold (V_IH)
Low Input Voltage Threshold (V_IL)
High Level Output Voltage (V_OH)
Low Level Output Voltage (V_OL)
Rise/ Fall Time
Short-Circuit Current
CLK
High Level Output Voltage (V_OH)
Low Level Output Voltage (V_OL)
CLK Rise/Fall Time
CLK Frequency
RST
High Level Output Voltage (V_OH)
Low Level Output Voltage (V_OL)
RST Rise/Fall Time
PRES
High Input Voltage Threshold (V_IH)
Low Input Voltage Threshold (V_IL)
PRES Pull-Up Current
PRES Debounce Time
CONDITIONS
Sink Current = – 20µA
I_IH(MAX) = ±20µA
I_IL(MAX) = 1mA
Source Current = 20µA, DATA = V_IN
Sink Current = – 1mA, DATA = 0V (Note 3)
Loaded with 30pF, 10% to 90%
Shorted to V_CC
Source Current = 100µA
Sink Current = – 200µA
CLK Loaded with 30pF
CLK Loaded with 30pF
Source Current = 200µA
Sink Current = – 200µA
Loaded with 30pF
V_PRES = 0V
Proportional to the 0.68µF Charge Pump Capacitor
MIN
TYP
MAX
q 0.7 • V_IN 0.5 • V_IN
q
0.5 • V_IN 0.2 • V_IN
q
–1
1
q 250
q
0.3
q 0.6 • V_CC 0.5 • V_CC
q
0.5 • V_CC
0.8
q 0.8 • V_CC
q
0.3
q
0.5
q
3.5
5
q V_CC – 0.5
q
0.3
q
16
q
5
q 0.8 • V_CC
q
0.3
q
0.5
q 0.7 • V_IN 0.5 • V_IN
q
0.5 • V_IN 0.2 • V_IN
q
0.5
1
q
40
80
UNITS
V
V
µA
nA
V
V
V
V
V
µs
mA
V
V
ns
MHz
V
V
µs
V
V
µA
ms
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1756 is 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 and I/O pull-down drivers must sink up to 250µA
sourced by the internal current sources.
3