DS1834DS/T&R Maxim Integrated, DS1834DS/T&R Datasheet - Page 4

• Manufacturer Part Number: DS1834DS/T&R
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: DS1834, DS1834A, DS1834Dr

Specifications of DS1834DS/T&R

• Number Of Voltages Monitored: 2
• Monitored Voltage: 3.3 V, 5 V
• Undervoltage Threshold: 4.5 V, 2.8 V
• Overvoltage Threshold: 4.75 V, 2.97 V
• Output Type: Active High
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 500 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8 Narrow
• Chip Enable Signals: No
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: Yes
• Supply Current (typ): 50 uA
• Supply Voltage - Min: 1.2 V
• Part # Aliases: 90-1834D-ST0

DS1834/A/D
OUTPUT VALID CONDITIONS
All versions of the DS1834 can maintain valid outputs as long as one input remains above 1.2 volts.
However, the
outputs on the DS1834 use a push-pull output structure which can maintain a valid
RST
output below 1.2 volts. To sink current below 1.2 volts a resistor can be connected from
to GND
RST
(see Figure 5). This arrangement will maintain a valid value on the
outputs even if all inputs are at 0
RST
volts. During both power-up and power-down this arrangement will draw current when
is in the high
RST
state. A value of about 100 k =should be adequate to maintain a valid condition.
The DS1834A requires pull-up resistors on the outputs to maintain a valid output. The value of the
resistors is not critical in most cases but must be set low enough to pull the output to a high state. A
common value used is 10 k s (see Figure 6 and Figure 7).
APPLICATION DIAGRAM:
VALID TO 0 VOLTS V
ON THE DS1834 Figure 5
RST
CC
APPLICATION DIAGRAM: DS1834A NMOS OUTPUTS Figure 6
Note: If outputs are pulled-up to different voltages the outputs can not be connected to form a wired
"AND".
APPLICATION DIAGRAM: DS1834A WIRED "AND" OUTPUT Figure 7
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