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MAX793T数据手册封面

MAX793T Datasheet

  • MAX793T

  • 3.0V/3.3V可调、微处理器监控电路, 微处理器监控电路, 提供备用...

  • 604.40KB

  • 20页

  • MAXIM

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3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
have without causing a reset pulse to be issued. As
the amplitude of the transient increases (i.e., goes far-
ther below the reset threshold), the maximum allowable
pulse width decreases. Typically, a V
CC
transient that
goes 40mV below the reset threshold and lasts for
10碌s or less will not cause a reset pulse to be issued.
A 0.1碌F bypass capacitor mounted close to the V
CC
pin provides additional transient immunity.
_________________Pin Configurations
TOP VIEW
OUT 1
V
CC
2
(RESET IN) BATT OK 3
PFI 4
BATT ON 5
GND 6
PFO 7
MR 8
16 BATT
15 RESET
14 LOWLINE
MAX793/MAX794/MAX795
Watchdog Software Considerations
There is a way to help the watchdog timer monitor soft-
ware execution more closely, which involves setting
and resetting the watchdog input at different points in
the program rather than 鈥減ulsing鈥?the watchdog input
high-low-high or low-high-low. This technique avoids a
鈥渟tuck鈥?loop, in which the watchdog timer would con-
tinue to be reset within the loop, keeping the watchdog
from timing out. Figure 19 shows an example of a flow
diagram where the I/O driving the watchdog input is
set high at the beginning of the program, set low at the
beginning of every subroutine or loop, then set high
again when the program returns to the beginning. If
the program should 鈥渉ang鈥?in any subroutine, the prob-
lem would quickly be corrected, since the I/O is contin-
ually set low and the watchdog timer is allowed to time
out, causing a reset or interrupt to be issued.
MAX793
MAX794
13 RESET
12 CE OUT
11 CE IN
10 WDI
9
WDO
DIP / Narrow SO
OUT 1
V
CC
2
BATT ON 3
GND 4
8
BATT
7 RESET
MAX795
6 CE OUT
5 CE IN
DIP/SO
( ) ARE FOR MAX794
_Ordering Information (continued)
PART*
MAX794CPE
MAX794CSE
MAX794EPE
MAX794ESE
MAX795_CPA
MAX795_CSA
MAX795_EPA
MAX795_ESA
TEMP. RANGE
0掳C to +70掳C
0掳C to +70掳C
-40掳C to +85掳C
-40掳C to +85掳C
0掳C to +70掳C
0掳C to +70掳C
-40掳C to +85掳C
-40掳C to +85掳C
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
16 Narrow SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
___________________Chip Information
TRANSISTOR COUNT: 1271
* The MAX793/MAX795 offer a choice of reset threshold voltage.
Select the letter corresponding to the desired reset threshold volt-
age range (T = 3.00V to 3.15V, S = 2.85V to 3.00V, R = 2.55V
to 2.70V) and insert it into the blank to complete the part number.
The MAX794鈥檚 reset threshold is adjustable.
______________________________________________________________________________________
19

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