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PDF ADM6346 Data sheet ( Hoja de datos )
| Número de pieza | ADM6346 | |
| Descripción | (ADM6326 - ADM6348) SOT-23 Microprocessor Reset Circuits | |
| Fabricantes | Analog Devices | |
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Ultralow Power, 3-Lead, SOT-23
Microprocessor Reset Circuits
ADM6326/ADM6328/ADM6346/ADM6348
FEATURES
Ultralow supply current of 1 μA maximum (ADM6326/ADM6328)
Accurate monitoring of 2.5 V, 3 V, 3.3 V, and 5 V rails
Reset thresholds available in increments from 2.2 V to 4.63 V
Glitch immunity from negative-going VCC transients
2 reset output options
Push-pull RESET (ADM6326/ADM6346)
Open-drain RESET (ADM6328/ADM6348)
Minimum reset timeout of 100 ms
Operating temperature range of −40°C to +85°C
3-lead SOT-23 package
APPLICATIONS
Telecommunications
Microprocessor systems
Desktop and notebook computers
Portable equipment
GENERAL DESCRIPTION
The ADM6326/ADM6328/ADM6346/ADM6348 devices provide
low cost solutions for protecting sensitive circuitry, such as micro-
processor and telecommunications circuitry.
With built-in glitch immunity, ultralow supply currents, and
24 reset threshold voltage options, the ADM6326/ADM6328/
ADM6346/ADM6348 not only ensure that systems are immune
to fast transients on VCC, but also that the devices are suitable
for monitoring a variety of supply voltages in low power,
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These devices provide a reset output during power-up, power-
down, and brownout conditions. On power-up, an internal
timer holds RESET asserted for at least 100 ms. This holds the
FUNCTIONAL BLOCK DIAGRAMS
ADM6326/ADM6346
VCC
VREF
RESET
GENERATOR
(100ms)
RESET
GND
Figure 1.
ADM6328/ADM6348
VCC
VREF
RESET
GENERATOR
(100ms)
RESET
GND
Figure 2.
microprocessor in a reset state until conditions have stabilized.
The reset output remains operational with VCC as low as 1 V.
The ADM6326 and ADM6346 have an active low push-pull reset
output. The ADM6328 and ADM6348 have an active low open-
drain reset output, which requires an external pull-up resistor.
The ADM6326 and ADM6328 offer a choice of ten reset thresholds
in increments between 2.2 V and 3.08 V, whereas the ADM6346
and ADM6348 offer a choice of 14 reset thresholds between 3.3 V
and 4.63 V.
These devices are available in a 3-lead SOT-23 package and
operate over the extended temperature range of −40°C to +85°C.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.
1 page  
ADM6326/ADM6328/ADM6346/ADM6348
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADM6326/
GND 1 ADM6328/
ADM6346/
ADM6348 3 VCC
TOP VIEW
RESET 2 (Not to Scale)
Figure 3. ADM6326/ADM6328/ADM6346/ADM6348 Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 GND Ground Reference for All Signals; 0 V.
2
RESET
Active Low Logic Output. This pin is low when VCC is less than the reset threshold; it remains low for 185 ms
(typical) after VCC becomes greater than the reset threshold.
3 VCC
Supply Voltage Being Monitored.
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Rev. 0 | Page 5 of 12
5 Page 
NOTES
ADM6326/ADM6328/ADM6346/ADM6348
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Rev. 0 | Page 11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ADM6346.PDF ] | |
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