ltc2903-1 Linear Technology Corporation, ltc2903-1 Datasheet - Page 6

• Manufacturer Part Number: ltc2903-1
• Description: Precision Quad Supply Monitor In 6-lead Sot-23
• Manufacturer: Linear Technology Corporation

LTC2903-1
PI FU CTIO S
TYPICAL PERFOR A CE CHARACTERISTICS
V1 (Pin 1): Voltage Input 1 (5V, 3.3V). Internal V
generated from the greater voltage on the V1, V2 inputs.
Bypass this pin to ground with a 0.1 F (or greater)
capacitor.
GND (Pin 2): Ground.
V2 (Pin 3): Voltage Input 2 (3.3V, 2.5V). Internal V
generated from the greater voltage on the V1, V2 inputs.
Bypass this pin to ground with a 0.1 F (or greater)
capacitor.
6
TI I G DIAGRA
U
W
U
U
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
U
0
RST Pull-Up Current vs V2
V1, V3, V4 ABOVE THRESHOLD
0.5
1
W
W
1.5
V
RT25
2
U
V2 (V)
2.5
3 3.5
V
RST
RT33
V
X
4
V
4.5
28031 G18
RTX
5
CC
CC
is
is
t
UV
V3 (Pin 4): Voltage Input 3 (2.5V, 1.8V). This input assists
the RST pull-down circuitry below 1V.
V4 (Pin 5): Voltage Input 4 (ADJ, 1.8V, –5.2V). See Table
1 for recommended ADJ resistor values.
RST (Pin 6): Reset Logic Output. Pulls low when any volt-
age input is below reset threshold and held low for 200ms
after all voltage inputs exceed threshold. The pin contains
a weak pull-up to V2. Use an external pull-up for faster rise
times or output voltages greater than V2.
t
RST
–40
–35
–30
–25
–20
–10
–15
–5
0
0
1.5V
RST Pull-Up Current vs External
Pull-Down Voltage on RST
LTC2903B, C
LTC2903A
2903 TD
0.5
1
1.5
V
RST
(V)
2
2.5
3
29031 G19
3.5
29031f