Datasheet

LTC2938/LTC2939
3
293839ff
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Minimum Internal Operating Voltage RST in Correct Logic State
l
1V
V
CCMINP
Minimum Required for Confi guration V
CC
Rising
l
2.6 V
V
RT50
5V, 5% Reset Threshold V1 Input Threshold
l
4.600 4.675 4.750 V
V
RT33
3.3V, 5% Reset Threshold V1, V2 Input Threshold
l
3.036 3.086 3.135 V
V
RT25
2.5V, 5% Reset Threshold V2, V3 Input Threshold
l
2.300 2.338 2.375 V
V
RT18
1.8V, 5% Reset Threshold V2, V3, V4 Input Threshold
l
1.656 1.683 1.710 V
V
RT15
1.5V, 5% Reset Threshold V2, V3, V4 Input Threshold
l
1.380 1.403 1.425 V
V
RT12
1.2V, 5% Reset Threshold V2, V3, V4 Input Threshold
l
1.104 1.122 1.140 V
V
RTA
ADJ Reset Threshold V3, V4, V5, V6 Input Threshold
l
492.5 500 507.5 mV
V
RTAN
–ADJ Reset Threshold V4 Input Threshold
l
–18 0 18 mV
V
REF
Reference Voltage V
CC
> 2.3V, I
VREF
= ±1mA,
C
REF
< 1000pF
l
1.192 1.210 1.228 V
V
PG
Confi guration Voltage Range V
CC
> V
CCMINP
l
0V
REF
V
I
VPG
V
PG
Input Current V
PG
= V
REF
l
±20 nA
I
V1
V1 Input Current V1 = 5V, I
VREF
= 12μA, (Note 4)
l
80 125 μA
I
V2
V2 Input Current V2 = 3.3V
l
0.8 2 μA
I
V3
V3 Input Current V3 = 2.5V
V3 = 0.55V (ADJ Mode)
l
l
0.52 1.2
±15
μA
nA
I
V4
V4 Input Current V4 = 1.8V
V4 = 0.55V (ADJ Mode)
V4 = -0.02V (–ADJ Mode)
l
l
l
0.34 0.8
±15
±15
μA
nA
nA
I
V5
, I
V6
V5, V6 Input Current (LTC2939) V5, V6 = 0.55V
l
±15 nA
I
CRT(UP)
CRT Pull-Up Current V
CRT
= GND
l
–1.4 –2 –2.6 μA
I
CRT(DN)
CRT Pull-Down Current V
CRT
= 1.3V
l
10 20 30 μA
t
RST
Reset Timeout Period C
RT
= 1500pF
l
234 ms
t
UV
V
n
Undervoltage Detect to RST V
n
Less Than Reset Threshold V
RTX
by
More Than 1%
150 μs
V
OL
Voltage Output Low RST I
SINK
= 2.5mA; V
CC
= 3V
l
0.15 0.4 V
I
SINK
= 100μA; V
CC
= 1V
l
0.05 0.3 V
V
OL
Voltage Output Low WDO I
SINK
= 2.5mA; V
CC
= 3.3V
l
0.15 0.4 V
V
OH
Voltage Output High RST, WDO
(Note 5)
I
SOURCE
= –1μA; V2 = 3.3V
l
V2 – 1 V
I
CWT(UP)
CWT Pull-Up Current V
CWT
= GND
l
–1.4 –2 –2.6 μA
I
CWT(DN)
CWT Pull-Down Current V
CWT
= 1.3V
l
10 20 30 μA
t
WD
Watchdog Timeout Period C
WT
= 1500pF
l
20 30 40 ms
V
WDI
WDI Input Threshold
(V
CC
= 3.3V to 5.5V)
Logic Low
Open
Logic High
l
l
l
0.7
1.4
0.9
0.4
1.1
V
V
V
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C, V
CC
= 5V unless otherwise specifi ed. (Note 3)