DS1834A/T&R/ 参数 Datasheet PDF下载

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

RST

outputs on the DS1834 use a push-pull output structure which can maintain a valid

output below 1.2 volts. To sink current below 1.2 volts a resistor can be connected from

RST

to GND

(see Figure 5). This arrangement will maintain a valid value on the

RST

outputs even if all inputs are at 0

volts. During both power-up and power-down this arrangement will draw current when

RST

is in the high

state. A value of about 100 kΩ=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 kΩs (see Figure 6 and Figure 7).

APPLICATION DIAGRAM:

RST

VALID TO 0 VOLTS V

CC

ON THE DS1834

Figure 5

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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