ADM803SAKSZ-REEL7

ADM803/ADM809/ADM810 

Data Sheet

 

Rev. I | Page 8 of 11 

INTERFACING TO OTHER DEVICES 

The 

ADM803

/

ADM809

/

ADM810

 series is designed to integrate 

with as many devices as possible and, therefore, has a standard 
output dependent on V

CC

. This enables the parts to be used in 

both 3 V and 5 V, or any nominal voltage within the minimum 
and maximum specifications for V

CC

. This design simplifies 

interfacing the 

ADM803

/

ADM809

/

ADM810

 to other devices.  

ENSURING A VALID RESET OUTPUT DOWN TO 
V

CC

 = 0 V  

When V

CC

 falls below 0.8 V, the 

ADM803

/

ADM809

 RESET no 

longer sinks current. A high impedance CMOS logic input 
connected to RESET may, therefore, drift to undetermined logic 
levels. To eliminate this problem, a 100 kΩ resistor should be 
connected from RESET to ground.  

 

Figure 12. Ensuring a Valid Reset Output Down to V

CC

 = 0 V  

BENEFITS OF AN ACCURATE RESET THRESHOLD  

In other microprocessors, tolerances in supply voltages lead  
to an overall increase in reset tolerance levels due to the 
deterioration of the reset circuit’s power supply. In the 

ADM803

/

ADM809

/

ADM810

, the possibility of a malfunction 

during a power failure is greatly reduced because the devices 
can operate effectively even when there are large degradations 
of the supply voltages. Another advantage is the very accurate 
internal voltage reference circuit of the 

ADM803

/

ADM809

ADM810

. These benefits combine to produce an exceptionally 

reliable voltage monitor circuit.  

INTERFACING TO MICROPROCESSORS WITH 
MULTIPLE INTERRUPTS  

In a number of cases, it is necessary to interface many interrupts 
from different devices (for example, thermal, altitude, and 
velocity sensors). The 

ADM803

/

ADM809

/

ADM810

 can easily 

be integrated into existing interrupt-handling circuits, as shown 
in Figure 13, or can be used as standalone devices.  

 

Figure 13. Interfacing to Microprocessors with Multiple Interrupts  

 

GND

ADM809

V

CC

V

CC

RESET

0

373

6-

0

11

4-LINE BCD TO
MICROPROCESSOR

ADM809

GND

V

CC

V

CC

RESET

OTHER SENSING

DEVICES

PRIORITY ENCODER

74LS147

03

736

-01

2

ADM803SAKSZ-REEL7 Datasheet Related Products:
ADM803SAKSZ-REEL7 Information:
Part No.
ADM803SAKSZ-REEL7
Description
IC SUPERVISOR MPU 2.93V SC70-3
File Size
210560 bytes
Page Size
612 x 792 pts (letter)
All Pages
11
Manufacturer
Analog Devices, Inc.
Homepage
http://www.analog.com/
Logo