Datasheet

LTC2904/LTC2905
3
29045fd
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT50
5V, 5% Reset Threshold
5V, 7.5% Reset Threshold
5V, 10% Reset Threshold
V1 Input Threshold
l
l
l
4.600
4.475
4.350
4.675
4.550
4.425
4.750
4.625
4.500
V
V
V
V
RT33
3.3V, 5% Reset Threshold
3.3V, 7.5% Reset Threshold
3.3V, 10% Reset Threshold
V1, V2 Input Threshold
l
l
l
3.036
2.954
2.871
3.086
3.003
2.921
3.135
3.053
2.970
V
V
V
V
RT25
2.5V, 5% Reset Threshold
2.5V, 7.5% Reset Threshold
2.5V, 10% Reset Threshold
V1, V2 Input Threshold
l
l
l
2.300
2.238
2.175
2.338
2.275
2.213
2.375
2.313
2.250
V
V
V
V
RT18
1.8V, 5% Reset Threshold
1.8V, 7.5% Reset Threshold
1.8V, 10% Reset Threshold
V2 Input Threshold
l
l
l
1.656
1.611
1.566
1.683
1.638
1.593
1.710
1.665
1.620
V
V
V
V
RT15
1.5V, 5% Reset Threshold
1.5V, 7.5% Reset Threshold
1.5V, 10% Reset Threshold
V2 Input Threshold
l
l
l
1.380
1.343
1.305
1.403
1.365
1.328
1.425
1.388
1.350
V
V
V
V
RT12
1.2V, 5% Reset Threshold
1.2V, 7.5% Reset Threshold
1.2V, 10% Reset Threshold
V2 Input Threshold
l
l
l
1.104
1.074
1.044
1.122
1.092
1.062
1.140
1.110
1.080
V
V
V
V
RT10
1V, 5% Reset Threshold
1V, 7.5% Reset Threshold
1V, 10% Reset Threshold
V2 Input Threshold
l
l
l
0.920
0.895
0.870
0.935
0.910
0.885
0.950
0.925
0.900
V
V
V
V
CCMIN
Minimum Internal Operating Voltage (Note 2) RST in Correct Logic State
l
1V
I
V1
V1 Input Current Includes Input Current to Three-State Pins
l
65 130 μA
I
V2
V2 Input Current
l
0.4 1.0 μA
I
TMR(UP)
TMR Pull-Up Current LTC2905 V
TMR
= 0V
l
–1.5 –2.1 –2.7 μA
I
TMR(DOWN)
TMR Pull-Down Current LTC2905
LTC2905H
V
TMR
= 1.4V
l
l
1.5
1.4
2.1
2.0
2.7
2.7
μA
μA
t
RST
Reset Timeout Period LTC2904
l
140 200 260 ms
t
RST
Reset Timeout Period LTC2905
LTC2905H
C
TMR
= 22nF
l
l
140
140
200 260
295
ms
ms
t
UV
Vx Undervoltage Detect to
RST or RST
Vx Less than Reset Threshold V
RTX
by More than 1%
150 μs
V
OL
Output Voltage Low RST, RST I = 2.5mA
I = 100μA; V1 = 1V (RST Only)
l
l
0.15
0.05
0.4
0.3
V
V
V
OH
Output Voltage High RST, RST
(Notes 2, 5)
I = –1μA
l
V
CC
–1 V
Three-State Inputs S1, S2, TOL
V
IL
Low Level Input Voltage
l
0.4 V
V
IH
High Level Input Voltage
l
1.4 V
V
Z
Pin Voltage When Left in Open State I = –10μA
I = 0μA
I = 10μA
l
l
0.7
0.9
1.1
V
V
V
2905H I = –10μA
I = 0μA
I = 10μA
l
l
0.65
0.9
1.15
V
V
V
I
VPG
Programming Input Current (Note 6)
l
±25
μA
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V1 = 2.5V, V2 = 1V, S1 = TOL = V1, S2 = 0V, unless otherwise noted.
(Notes 2, 3)