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參數(shù)資料
| 型號(hào)： | 935271414518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3.90 MM, PLASTIC, MS-012, SO-8 |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大小： | 116K |
| 代理商： | 935271414518 |
Philips Semiconductors
Product data
MAX708R/S/T
3 V microprocessor supervisor circuit with
power fail comparator and manual reset
2
2002 Feb 13
DESCRIPTION
The MAX708R/S/T are microprocessor supervisory circuits used to
monitor +3 V power supply levels in +3 V to +5 V microprocessor
and other logic systems. The R, S, T suffixes have reset thresholds
of 2.63 V, 2.93 V and 3.08 V, respectively. They reduce the number
of circuit components, and improve reliability and accuracy
compared to using separate ICs or discrete components.
The MAX708R/S/T features make the MAX708R/S/T ideal for use in
portable, battery operated equipment. The low supply current,
typically 50
A, minimizes battery load. Both RESET and RESET
are active during power-up, power-down and brownout conditions
An active-LOW manual reset input is also available.
A 1.25 V threshold detector provides power-fail warning. This
independent comparator can be used to monitor a second voltage
supply and provide an early warning to the microprocessor that
voltage is falling. This allows for an orderly shutdown, transmitting
an alert to an operator, or activation of an alternate power source
before the device asserts the reset signals.
The device is available in the 8-pin SO package.
FEATURES
RESET and RESET signals
Independent comparator with 1.25 V threshold for power failure or
low battery warning
Manual reset input
50 A quiescent current
Reset thresholds of 2.63, 2.93, and 3.08 V
Guaranteed RESET assertion to V
CC = 1 V
APPLICATIONS
Battery powered devices
Critical microprocessor monitoring
Controllers
Portable instruments
SIMPLIFIED SYSTEM DIAGRAM
SL01640
VCC
RESET INPUT
INTERRUPT
GND
MICROPROCESSOR
VCC
PFI
GND
MAX708
PFO
RESET
REGULATED
DC SUPPLY (VCC)
MR
PUSH-BUTTON
SWITCH
UNREGULATED
DC SUPPLY
R1
1%
R2
1%
Figure 1. Simplified system diagram.
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