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LTC2916HTS8-1#TRMPBF

P1-P3P4-P6P7-P9P10-P12
LTC2915/LTC2916
4
29156fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Reset Timer Control (RT)
I
RT(UP)
RT Pull-Up Current V
RT
= 0.25V
l
–2 –3 –4 μA
I
RT(DOWN)
RT Pull-Down Current V
RT
= 1.1V
l
234 μA
I
RT(INT)
Internal RT V
CC
Detect Current V
RT
= V
CC
l
18 μA
V
RT(INT,LH)
RT Internal Timer Threshold V
RT
Rising, Referenced to V
CC
l
–100 –160 –300 mV
Reset Output (RST)
t
RST(INT)
Internal Reset Timeout Period V
RT
= V
CC
l
150 200 260 ms
t
RST(EXT)
Adjustable Reset Timeout Period C
RT
= 2.2nF
l
16 20 25 ms
t
UV
VM Undervoltage Detect to RST
Asserted
VM Less Than Reset Threshold
V
MTX
by More Than 5%
l
10 80 150 μs
V
OL
Output Voltage Low RST V
CC
= 3.3V, I
RST
= 2.5mA
V
CC
= 1V, I
RST
= 100μA
V
CC
= 0.8V, I
RST
= 15μA
l
l
l
0.15
0.15
0.05
0.4
0.3
0.2
V
V
V
I
OH(RST)
RST Output Voltage High Leakage RST = V
CC
l
±1 μA
Manual Reset Input (LTC2916)
V
IL
Input Low Voltage
l
0.2 • V
CC
V
V
IH
Input High Voltage
l
0.8 • V
CC
V
R
PU
Pull Up Resistance
l
50 100 150
kΩ
t
PW
Pulsewidth
l
250 ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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
= 2.5V, unless otherwise noted. (Note 2)
Note 3: V
CC
maximum pin voltage is limited by input current. Since the
V
CC
pin has an internal 6.2V shunt regulator, a low impedance supply
which exceeds 5.7V may exceed the rated terminal current. Operation
from higher voltage supplies requires a series dropping resistor. See
Applications Information.
Note 4: Input impedance is dependent on the confi guration of the SEL
pins.
TIMING DIAGRAM
Monitor Input Timing
VM
RST
V
MTx
1V
t
UV
t
RST
29156 TD01
LTC2915/LTC2916
5
29156fa
TYPICAL PERFORMANCE CHARACTERISTICS
Internal Reset Timeout Period vs
Temperature
Shunt Regulation Voltage vs
Temperature
Shunt Regulation Voltage vs
Supply Current
Threshold Voltage vs
Temperature
Quiescent Supply Current vs
Temperature
Allowable Glitch Duration vs
Magnitude
T
A
= 25°C unless otherwise noted.
RST Output Voltage vs V
CC
RST Pull-Down Current vs V
CC
RST V
OL
vs I
RST
TEMPERATURE (°C)
–50
NORMALIZED V
MTnn
(%)
0.5
1.0
1.5
25 75
29156 G01
0
–0.5
–25 0
50 100 125
–1.0
–1.5
V
MT120
V
MTADJ
V
MT25
TEMPERATURE (°C)
–50
20
QUIESCENT SUPPLY CURRENT, I
CC
(μA)
25
30
35
40
–25 0 25 50
29156 G02
75 100 125
SEL1 = 0V
SEL2 = 2.5V
TOL = OPEN
V
CC
= 5.5V
V
CC
= 2.5V
V
CC
= 1.5V
GLITCH PERCENTAGE PAST THRESHOLD (%)
0.1
0
MAXIMUM ALLOWABLE GLITCH DURATION (μs)
200
250
300
1 10 100
29156 G03
150
100
50
RESET OCCURS
ABOVE CURVE
TEMPERATURE (°C)
–50 –25
150
RESET TIMEOUT PERIOD (ms), t
RST(INT)
190
250
0
50
75
29156 G04
170
230
210
25
100
125
RT = V
CC
SUPPLY CURRENT, I
CC
(mA)
0.01
SHUNT REGULATION VOLTAGE, V
CC(SHUNT)
(V)
6.4
6.6
100
29156 G06
6.2
6.0
0.1
1
10
7.0
6.8
TEMPERATURE (°C)
–50
6.1
SHUNT REGULATION VOLTAGE, V
CC(SHUNT)
(V)
6.2
6.3
6.4
–25 0 25 50
29156 G05
75 100 125
I
CC
= 5mA
I
CC
= 1mA
I
CC
= 100μA
SUPPLY VOLTAGE, V
CC
(V)
0
0
RST VOLTAGE (V)
1
2
3
4
5
6
1234
29156 G07
5
100k PULL-UP TO V
CC
SEL1 = SEL2 = TOL = 0V
V
M
= 0.5V
SUPPLY VOLTAGE, V
CC
(V)
0
0
PULL-DOWN CURRENT, I
RST
(mA)
1
2
3
4
5
6
1234
29156 G08
5
RST AT 150mV
RST AT 50mV
I
RST
(mA)
0
RST VOLTAGE (V)
0.6
0.8
1.0
8
29156 G09
0.4
0.2
0
2
4
6
10
T
A
= 125°C
T
A
= 25°C
T
A
= –40°C
NO PULL-UP R
V
CC
= 2.5V
LTC2915/LTC2916
6
29156fa
PIN FUNCTIONS
GND (Pin 4/Pin 1): Device Ground.
MR (Pin 3/Pin 2) (LTC2916 only): Manual Reset Input
(Active Low). A low level on the MR input causes the part
to issue a reset, which is released one reset timeout after
the input goes high. The pin has an internal 100k pull-up
to V
CC
, and thus may interface directly to a momentary
pushbutton. Leave open if unused.
RST (Pin 5/Pin 8): Open Drain RST Output. Asserts low
when VM is below the threshold selected by SEL1, SEL2
and TOL input pins. Held low for an adjustable timeout
after VM input is above threshold.
RT (Pin 6/Pin 7): Reset Timeout Control Pin. Attach an
external Capacitor (C
RT
) to GND to set a reset timeout of
9ms/nF. Floating RT generates a reset timeout of approxi-
mately 400μs. Tie RT to V
CC
to generate a reset timeout
of approximately 200ms.
SEL1, SEL2 (Pins 2, 7/Pins 3, 6): Monitor Voltage Select
Three-State Inputs. SEL1 and SEL2 control the nominal
threshold voltage that VM is set to monitor. Connect to V
CC
,
GND or leave unconnected in open state. (See Table 1).
TOL (Pin 3/Pin 2) (LTC2915 only): Three-State Input
for Supply Tolerance Selection (–5%, –10% or –15%).
Controls the tolerance band at which the VM supply is
monitored. Connect to V
CC
, GND, or leave unconnected
in open state. (See Table 2).
V
CC
(Pin 8/Pin 5): Power Supply Input. Bypass this pin
to ground with a 0.1μF ceramic capacitor. A minimum of
1.5V on V
CC
ensures that the part is out of under voltage
lockout and that the voltage thresholds are accurate.
Operates as a direct supply input for voltages up to 5.5V.
Operates as a shunt regulator for supply voltages greater
than 5.7V and should have a resistor between this pin and
the supply to limit V
CC
input current to no greater than
5mA. When used without a current-limiting resistor, pin
voltage must not exceed 5.7V.
VM (Pin 1/Pin 4): Voltage Monitor Input to RST Compara-
tor. SEL1, SEL2 and TOL inputs select the exact threshold
that asserts the RST output.
Exposed Pad (Pin 9, DFN Only): Exposed Pad may be left
open or connected to device ground.
(TSOT/DFN)
BLOCK DIAGRAM
GND
RST
V
CC
V
CC
29156 BD
RT
INTERNAL
200ms TIMER
ADJUSTABLE
RESET TIMER
RESET
DRIVER LOGIC
V
CC
DETECT
6.2V
+
–
V
CC
VM
SEL1 MRSEL2
3 STATE
DECODE
MONITOR
DIVIDER
MATRIX
REFERENCE
DIVIDER
MATRIX
TOL
100k
0.5V
+
–
LTC2916LTC2915
P1-P3P4-P6P7-P9P10-P12

LTC2916HTS8-1#TRMPBF

Mfr. #:
Buy LTC2916HTS8-1#TRMPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits V Sup w/ 9 Sel Thresholds & Manual Reset
Lifecycle:
New from this manufacturer.
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