•Automotive display, integrated cockpit and driver
monitoring
•Telematics control unit and emergency call
3Description
The TPS3840-Q1 family of voltage supervisors or
reset ICs can operate at high voltage levels while
maintaining very low quiescent current across the
whole VDDand temperature range. TPS3840-Q1
offers best combination of low power consumption,
high accuracy and low propagation delay (t
µs typical).
Reset output signal is asserted when the voltage at
VDD drops below the negative voltage threshold (V
or when manual reset is pulled to a low logic (V
Reset signal is cleared when VDDrise above V
hysteresis (V
above V
) and manual reset (MR) is floating or
IT+
and the reset time delay (tD) expires.
MR_H
Reset time delay can be programmed by connecting
a capacitor between CT pin and ground. For a fast
reset CT pin can be left floating.
Additional features: Low power-on reset voltage
(V
), built-in glitch immunity protection for MR and
POR
VDD, built-in hysteresis,low open-drain output
leakage current (I
TPS3840-Q1SOT-23 (5) (DBV)2.90 mm × 1.60 mm
(1) For package details, see the mechanical drawing addendum
at the end of the data sheet.
(1)
p_HL
IT-
= 30
IT-
MR_L
plus
)
).
Typical Application Circuit
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (September 2019) to Revision BPage
•Changed equation 5 and 6 ................................................................................................................................................... 17
•Added section describing further details on capacitor. ........................................................................................................ 18
Changes from Original (April 2019) to Revision APage
•Advance Information to Production Data Release ................................................................................................................ 1
RESETN/A1OActive-High Output Reset Signal: This pin is driven high
RESET1N/AOActive-Low Output Reset Signal: This pin is driven logic
VDD22IInput Supply Voltage. TPS3840-Q1 monitors VDD voltage
GND33_Ground
MR / NC44IManual Reset. Pull this pin to a logic low (V
CT55-Capacitor Time Delay Pin. The CT pin offers a user-
I/ODESCRIPTION
when either the MR pin is driven to a logic low or VDD
voltage falls below the negative voltage threshold (V
RESET remains high (asserted) for the delay time period (tD)
after both MR is floating or above V
rise above V
IT+.
MR_L
when either the MR pin is driven to a logic low or VDD
voltage falls below the negative voltage threshold (V
RESET remains low (asserted) for the delay time period (tD)
after both MR is floating or above V
rise above V
IT+.
MR_L
reset signal in the output pin. After the MR pin is left floating
or pull to V
reset delay time(tD) expires. MR can be left floating when
the output goes to the nominal state after the
MR_H
not in use. NC stands for "No Connection" or floating.
programmable delay time. Connect an external capacitor on
this pin to adjust time delay. When not in use leave pin
floating for the smallest fixed time delay.
(1) Stresses beyond those listed under Absolute Maximum Rating may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Condition. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If the logic signal driving MR is less than VDD, then additional current flows into VDDand out of MR. VMRshould not be higher than V
(3) As a result of the low dissipated power in this device, it is assumed that TJ= TA.
7.2 ESD Ratings
Human body model (HBM), per ANSI/ESDA/JEDEC JS-
(1)
V
(ESD)
Electrostatic discharge
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
001
Charged device model (CDM), per JEDEC specification
JESD22-C101
(2)
(1)
MINMAXUNIT
V
–0.312
J
–40150
–65150
°C
VALUEUNIT
± 2000
V
± 750
DD.
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MINNOMMAXUNIT
V
DD
V
, V
RESET
RESET
I
, I
RESET
RESET
T
J
(1)
V
MR
(1) If the logic signal driving MR is less than VDD, then additional current flows into VDDand out of MR. VMRshould not be higher than V
Input supply voltage1.510V
RESET pin and RESET pin voltage010V
RESET pin and RESET pin current0±5mA
Junction temperature (free air temperature)–40125°C
Manual reset pin voltage0V
At 1.5 V ≤ VDD≤ 10 V, CT = MR = Open, RESET pull-up resistor (R
and over the operating free-air temperature range – 40°C to 125°C, unless otherwise noted. Typical values are at TJ= 25°C.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
COMMON PARAMETERS
V
V
V
V
I
DD
V
V
R
R
TPS3840PL (Push-Pull Active-Low)
V
V
V
TPS3840PH (Push-Pull Active-High)
V
V
V
TPS3840DL(Open-Drain)
V
V
I
lkg(OD)
(1) V
(2) V
(3) If the logic signal driving MR is less than VDD, then additional current flows into VDD and out of MR
(4) V
Input supply voltage1.510V
DD
Negative-going input threshold accuracy
ITHYS
HYS
Hysteresis on V
Hysteresis on V
pinV
IT-
pinV
IT-
(1)
-40°C to 125°C–1.511.5%
= 3.1 V to 4.9 V175200225mV
IT-
= 1.6 V to 3.0 V75100125mV
IT-
VDD = 1.5 V < VDD< 10 V
Supply current into VDD pin
VDD > V
TA= -40°C to 125°C
Manual reset logic low input
MR_L
Manual reset logic high input
MR_H
Manual reset internal pull-up resistance100kΩ
MR
CT pin internal resistance350500650kΩ
CT
Power on Reset Voltage
POR
Low level output voltage
OL
(3)
(3)
V
(4)
OL(max)
I
OUT(Sink)
1.5 V < VDD< 5 V
VDD< V
I
OUT(Sink)
1.5 V < VDD< 5 V
VDD> V
High level output voltage
OH
I
OUT(Source
5 V < VDD< 10 V
VDD> V
I
OUT(Source)
Power on Reset Voltage
POR
(4)
VOH, I
OUT(Source)
1.5 V < VDD< 5 V
VDD> V
Low level output voltage
OL
I
OUT(Sink)
1.5 V < VDD< 5 V
VDD> V
I
OUT(Sink)
High level output voltage1.5 V < VDD< 5 V, VDD< V
OH
Power on Reset Voltage
POR
Low level output voltage
OL
(4)
I
OUT(Source)
V
OL(max)
I
OUT (Sink)
1.5 V < VDD< 5 V
VDD< V
I
OUT(Sink)
RESET pin in High Impedance,
Open-Drain output leakage current
threshold voltage range from 1.6 V to 4.9 V in 100 mV steps, for released versions see Device Voltage Thresholds table.
IT-
= V
IT+
POR
+ V
HYS
IT-
is the minimum VDDvoltage level for a controlled output state. VDDslew rate ≤ 100mV/µs
At 1.5 V ≤ VDD≤ 10 V, CT = MR = Open, RESET pull-up resistor (R
and over the operating free-air temperature range – 40°C to 125°C, VDD slew rate < 100mV / us, unless otherwise noted.
Typical values are at TJ= 25°C.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
t
STRT
t
P_HL
t
D
t
GI_VIT-
t
MR_PW
t
MR_RES
t
MR_tD
Startup Delay
Propagation detect delay for VDD falling
below V
Reset time delay
Glitch immunity V
MR pin pulse duration to initiate reset300ns
Propagation delay from MR low to resetVDD= 4.5 V, MR < V
Delay from release MR to deasert reset
(1) When VDD starts from less than the specified minimum VDDand then exceeds V
capacitor at CT pin will add tDdelay to t
(2) t
(3) The MIN and MAX reset time delay with external capacitor depends on RCTand is calculated using Equation 5 and Equation 6 in
measured from threhold trip point (V
P_HL
Section 8.3.2
(4) Overdrive % = [(VDD/ V
(1)
IT-
CT pin open100220350µs
VDD= V
IT+
to (V
CT pin = open
(3)
CT pin = 10 nF6.2ms
CT pin = 1 µF619ms
5% V
IT-
overdrive
IT-
VDD= 4.5 V,
MR = V
MR_L
time
STRT
) to VOLfor active low variants and VOHfor active high variants.
IT-
) - 1] × 100%
IT-
) = 100 kΩ to VDD, output reset load (C
pull-up
(2)
) - 10%
IT-
(4)
MR_L
to V
MR_H
, reset is release after the startup delay (t
IT+
) = 10 pF
LOAD
1530µs
50µs
10µs
700ns
t
D
STRT
ms
), a
(1) t
D (no cap)
is included in t
time delay. If tDdelay is programmed by an external capacitor connected to CT pin then
STRT
tDprogrammed time will be added to the startup time, VDD slew rate = 100 mV / µs.
(2) Open-Drain timing diagram assumes pull-up resistor is connected to RESET