TPS3420 Datasheet, PDF (1/19 Pages) Texas Instruments – Low-Power, Push-Button Controllers with Configurable Delay

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TPS3420
TPS3421
TPS3422
SBVS211A – AUGUST 2012 – REVISED MARCH 2013
Low-Power, Push-Button Controllers with Configurable Delay
Check for Samples: TPS3420, TPS3421, TPS3422
FEATURES
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•23 Very Small Package: 1.45-mm × 1-mm SON
• Operating Range: 1.6 V to 6.5 V
• Single (TPS3422) or Dual (TPS3420 and
TPS3421) Push-Button Inputs
• Low Supply Current: 250 nA
• Two-State Logic, User-Selectable Input Delay:
– For Example: 7.5 s and 0 s
– Multiple Timing Options Available
• Fixed Timeout Pulse at RST (TPS3421 and
TPS3422): 400 ms
– Other Timing Options Available on Request
• Active Low, Open-Drain Output
APPLICATIONS
• Smart Phones
• Tablets, Ultrabooks™
• Gaming Consoles
• Portable Consumer
• Navigation Devices
• Consumer Medical
• Toys
DESCRIPTION
The TPS3420, TPS3421, and TPS3422 (TPS342x)
are low-current, ultrasmall, push-button reset timers.
These devices use a long timing setup delay to
provide the intended system reset, and avoid resets
from short push-button closures or key presses. This
reset configuration also allows for differentiation
between software interrupts and hard system resets.
The TPS3420 and TPS3421 monitor two inputs (PB1
and PB2) and output an active-low reset pulse signal
(RST) when both inputs are low for the selected time
delay. For the TPS3421, RST remains low for a
factory-programmed fixed time. For the TPS3420,
RST remains low until one of the PBx inputs is
released. The need for a dedicated reset button is
eliminated because two inputs are used to ensure
reset. The TPS3422 monitors one input (PB1) and
outputs an active-low reset pulse signal (RST) when
PB1 is low for the selected time delay.
The TPS342x have an open-drain output that can be
wire ORed with other open-drain devices. The
TPS342x operate from 1.6 V to 6.5 V over the –40°C
to +125°C temperature range, and provide a precise,
space-conscious micropower solution for system
resetting needs.
V_IN = 1.6 V to 6.5 V
TPS3420, TPS3421
DRY PACKAGE
1,45-mm x 1-mm SON
(TOP VIEW)
TPS3422
DRY PACKAGE
1,45-mm x 1-mm SON
(TOP VIEW)
RST 1
GND 2
PB1 3
6 PB2
5 TS
4 VCC
RST 1
GND 2
PB1 3
6 TST
5 TS
4 VCC
Push-
Button
Switch
Push-
Button
Switch
VCC
PB1
RST
TPS3421
PB2
TS
GND
V_DD
Reset
Microprocessor,
PMU
GND
NOTE: Connect TS to VCC or ground for different PB time delays. Connect one PB input to ground for use as a single channel.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Ultrabooks is a trademark of Intel Corporation.
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All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012–2013, Texas Instruments Incorporated