Specifications

PC/II+p Board Technical Reference Manual 24

5.2 Recommended Operating Conditions

Table 4 Electrical – Recommended Operating Conditions

Parameter Symbol Min Typical Max Units NOTES

Power Supply Digital VCC 4.75 5.0 5.25 V

Power Supply Rise Time +3.0V to +5.0V SVCC 100 ms

Operating Ambient

Temperature

(Power Applied) TA 0 +70

°C

(1)

Storage Ambient

Temperature

TS -55 20.0 +125

°C

(2)

Humidity (Untested) HA 10 90 % RH

MR-RSTSW# Input Level

Low Level RSTSWL -0.03 +0.5 V (3)

MR-RSTSW# Input Level

High Level RSTSWH +2.8 +3.6 V (3)

NOTES

(1) Temperature is given for a board for which a Battery is NOT included onboard (an order option). If the

board contains lithium battery, then the absolute temperature board ratings must be modified to meet the

more restrictive ratings for lithium batteries. Refer to manufacturer's specifications for Lithium Batteries.

Never exceed the ratings of a lithium battery if a battery is present on the board.

(2) Temperature is given for a board for which power is NOT applied and a Battery is NOT included onboard

(an order option). If the board contains a lithium battery, then the absolute temperature board ratings must

be modified to meet the more restrictive ratings for lithium batteries. Refer to manufacturer's

specifications for Lithium Batteries. Never exceed the ratings of a lithium battery if a battery is

present on the board.

(3) Connector J904, pin MR-RSTSW# (the RSTSW# input pin) drives the Dallas DS1706 Reset Switch pin.

The DS1706 VCC is operated at +3.3V, and therefore the limits specified in the above table apply to

the PC/II+p and must NOT be exceeded. For compatibility to other Megatel 104Family boards, however,

and in accordance with Dallas recommendations, Megatel highly recommends that the RSTSW# line be

tied to GROUND to force a reset, and otherwise be left open; in the latter case, an internal 40K resistor in

the Dallas DS1706 chip pulls up the Manual Reset Switch pin to a high level during normal operation of

the board.