LTC2919HDDB-5#PBF Linear Technology, LTC2919HDDB-5#PBF Datasheet - Page 6

• Manufacturer Part Number: LTC2919HDDB-5#PBF
• Manufacturer: Linear Technology

Specifications of LTC2919HDDB-5#PBF

• Voltage Supervisor Type: Voltage Monitor
• Number Of Voltage Supervisors: 2
• Monitored Supervisor Voltage: 3.3
• Operating Supply Voltage (min): 0.5V
• Operating Temperature Classification: Automotive
• Operating Temp Range: -40C to 125C
• Pin Count: 10
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

PI FU CTIO S
LTC2919
TYPICAL PERFOR A CE CHARACTERISTICS
SEL (Pin 1): Input Polarity Select Three-State Input. Con-
nect to V
select one of three possible input polarity combinations
(refer to Table 1).
V
a 0.1μF (or greater) capacitor. Operates as a direct supply
input for voltages up to 6V. Operates as a shunt regulator
for supply voltages greater than 6V and should have a
resistor between this pin and the supply to limit V
current to no greater than 10mA. When used without a
current-limiting resistor, pin voltage must not exceed 6V.
UVLO options allow V
fi xed -10% UV supply monitor.
OUT1 (Pin 3): Open-Drain Logic Output 1. Asserts low
when positive polarity ADJ1 voltage is below threshold or
negative polarity ADJ1 voltage is above threshold. Requires
an external pull-up resistor and may be pulled above V
OUT2 (Pin 4): Open-Drain Logic Output 2. Asserts low
when positive polarity ADJ2 voltage is below threshold
or negative polarity ADJ2 voltage is above threshold.
Requires an external pull-up resistor and may be pulled
above V
RST (Pin 5): Open-Drain Inverted Reset Logic Output.
Asserts low when any positive polarity input voltage is
below threshold or any negative polarity input voltage is
above threshold or V
low for a timeout period after all voltage inputs are valid.
6
CC
U
1.0
0.8
0.4
0.2
0.6
(Pin 2): Power Supply. Bypass this pin to ground with
0
0
OUT1, OUT2, RST V
Sink Current
V
NO PULL-UP R
T
CC
A
CC
= 125°C
CC
= 3V
.
5
U
T
OUTPUT SINK CURRENT (mA)
, GND or leave unconnected in open state to
A
= 150°C
10
T
A
= –40°C
15
U
CC
CC
OL
20
is below UVLO threshold. Held
to be used as an accurate third
vs Output
(MSOP/DFN Package)
W
T
A
25
= 25°C
2919 G16
U
30
–16
–22
–10
–12
–14
–18
–20
–50 –25
I
SEL
SEL = GND
CC
vs Temperature
input
0
CC
TEMPERATURE (°C)
.
25
50
Requires an external pull-up resistor and may be pulled
above V
GND (Pin 6): Device Ground.
REF (Pin 7): Buffered Reference Output. 1V nominal
reference used for the offset of negative-monitoring ap-
plications. The buffered reference can source and sink
up to 1mA. The reference can drive a capacitive load of
up to 1000pF . Larger capacitance may degrade transient
performance. This pin does not require a bypass capacitor,
nor is one recommended. Leave open if unused.
TMR (Pin 8): Reset Timeout Control. Attach an external
capacitor (C
of 9ms/nF . A low leakage ceramic capacitor is recom-
mended for timer accuracy. Capacitors larger than 1μF
(9 second timeout) are not recommended. See Applica-
tions Information for further details. Leaving this pin open
generates a minimum timeout of approximately 400μs. A
2.2nF capacitor will generate a 20ms timeout. Tying this
pin to ground will enable the internal 200ms timeout. Ty-
ing this pin to V
part in comparator mode. Signals from the comparator
outputs will then go directly to RST.
ADJ2 (Pin 9): Adjustable Voltage Input 2. Input to volt-
age monitor comparator 2 (0.5V nominal threshold). The
polarity of the input is selected by the state of the SEL
pin (refer to Table 1). Tie to GND if unused (with SEL =
GND or Open).
75
100
CC
125
.
T
2919 G17
A
TMR
= 25°C unless otherwise noted.
150
CC
) to GND to set a reset timeout period
will disable the reset timer and put the
16
10
22
20
18
14
12
–50 –25
I
SEL
SEL = V
vs Temperature
CC
0
TEMPERATURE (°C)
25
50
75
100
125
2919 G18
2919f
150