LTC2938 LINER [Linear Technology], LTC2938 Datasheet - Page 3

• Manufacturer Part Number: LTC2938
• Description: Confi gurable 4- and 6-Supply Monitors with Watchdog Timer
• Manufacturer: LINER [Linear Technology]

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