CAT823, CAT824, CAT825

© 2010 SCILLC. All rights reserved.

5

Doc. No. MD-3027, Rev. D

Characteristics subject to change without notice

ELECTRICAL OPERATING CHARACTERISTICS (continued)

DC Characteristics:

-40ºC

≤ T

A

≤ +85ºC unless otherwise noted. Typical Values at T

Symbol

Parameter

Conditions

Min

Typ

Max

Units

WATCHDOG INPUT (CAT823 & CAT824)

Watchdog Timeout Period

1.12

1.60

3.20

s

WDI Pulse Width

50

ns

WDI Input Voltage

(3)

V

WDI Input Current

(4)

120

160

µA

WDI = 0V, Time Average

-20

-15

MANUAL RESET INPUT(CAT823 & CAT825)

MR

¯¯¯ Input Voltage

V

MR

¯¯¯ Pulse Width

1

µs

MR

¯¯¯ low to Reset Delay

5

µs

MR

¯¯¯ Noise Immunity

Pulse Width with No Reset

100

ns

MR

¯¯¯ Pullup Resistance (internal)

35

52

75

kΩ

Notes:

(3)

WDI is internally serviced within the watchdog period if WDI is left open.

(4)

The WDI input current is specified as an average input current when the WDI input is driven high or low. The WDI input if connected to a

three-stated output device can be disabled in the tristate mode as long as the leakage current is less than 10µA and a maximum

capacitance of less than 200pF. To clock the WDI input in the active mode the drive device must be able to source or sink at least 200µA

when active.