LTC2906CTS8 Linear Technology, LTC2906CTS8 Datasheet - Page 8

• Manufacturer Part Number: LTC2906CTS8
• Manufacturer: Linear Technology

Specifications of LTC2906CTS8

• Voltage Supervisor Type: Voltage Monitor
• Number Of Voltage Supervisors: 2
• Monitored Supervisor Voltage: 5/3.3/2.5/Adj
• Package Type: TSOT-23
• Operating Temperature Classification: Commercial
• Operating Temp Range: 0C to 70C
• Pin Count: 8
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

LTC2906/LTC2907
APPLICATIO S I FOR ATIO
Supply Monitoring
The LTC2906/LTC2907 are low power, high accuracy dual
supply monitoring circuits with an adjustable input and
another input with selectable threshold. Reset delay is set
to a nominal of 200ms for LTC2906 and is adjustable using
an external capacitor for LTC2907.
The three-state input pin (S1) selects one of three possible
threshold voltage levels for V1. Another three-state input
pin sets the supply tolerance (5%, 7.5% or 10%). Both
input voltages (V1 and V
mined thresholds for the reset not to be invoked. The
LTC2906/LTC2907 assert the reset outputs during power-
up, power-down and brownout conditions on any one of
the voltage inputs.
Power-Up
The greater of V1, V
(V
Therefore, as soon as V1 or V
up, the RST output asserts low.
V
LTC2906. Therefore, RST weakly pulls high when either
V1 or V
Threshold programming is complete, when V1 reaches at
least 2.17V. After programming, if any one of the Vx inputs
TI I G DIAGRA
8
MAX
MAX
W
also powers the drive circuits for the RST pin in the
). V
U
CC
MAX
reaches at least 1V.
powers the drive circuits for the RST pin.
U
CC
RST
RST
V
X
is the internal supply voltage
ADJ
U
W
CC
) must be above predeter-
V
RTX
reaches 1V during power
W
t
UV
U
Vx Monitor Timing
falls below its programmed threshold, RST asserts low
(RST weakly pulls high) as long as V
Once both V1 and V
an internal timer is started. After the programmed delay
time, RST weakly pulls high (RST asserts low).
Power-Down
On power-down, once either V1 or V
threshold, RST asserts logic low and RST weakly pulls
high. V
at RST.
Auxiliary Power
If an auxiliary power is available it can be connected to the
V
greater of V1, V
of 0.4V at RST for voltage inputs (V1 and/or V
to 0V.
Programming Pins
The two three-state input pins, S1 and TOL, should be
connected to GND, V1 or left unconnected during normal
operation. Note that when left unconnected, the maximum
leakage current allowable from the pin to either GND or V1
is 10 A.
t
CC
RST
pin. Since the internal supply voltage (V
MAX
of at least 1V guarantees a logic low of 0.4V
1V
1V
CC
; a V
ADJ
CC
inputs rise above their thresholds,
of at least 1V guarantees logic low
29067 TD
MAX
ADJ
drops below its
is at least 1V.
MAX
ADJ
) is the
) down
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