CAT823, CAT824, CAT825

© Catalyst Semiconductor, Inc.

5

Doc. No. MD-3027, Rev. A

Characteristics subject to change without notice

ELECTRICAL OPERATING CHARACTERISTICS (continued)

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

120

160

WDI Input Current

(4)

WDI = 0V, Time Average

-20

-15

µA

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.