w83196s-14 Winbond Electronics Corp America, w83196s-14 Datasheet - Page 12

• Manufacturer Part Number: w83196s-14
• Description: 100 Mhz Clock For Bx Chipset 2 Chip
• Manufacturer: Winbond Electronics Corp America

9. OPERATION OF DUAL FUCTION PINS
Pin13 is dual function pins and are used for selecting different functions in this device (see Pin
description). During power up, these pins are in input mode (see Figure 1), therefore, and are
considered input select pins. When V
latched into their appropriate internal registers. Once the correct information are properly latched,
these pins will change into output pins and will be pulled low by default. At the end of the power up
timer (within 3 ms) outputs starts to toggle at the specified frequency.
Each of these pins are a large pull-up resistor ( 250 K
1, but the internal pull-up resistor may be too large when long traces or heavy load appear on these
dual function pins. Under these conditions, an external 10 K
connected to V
The 10 K
only be latched at initial power on.
If optional EMI reducing capacitor are needed, they should be placed as close to the series
terminating resistor as possible and after the series terminating resistor. These capacitor has typical
values ranging from 4.7 pF to 22 pF.
resistor should be place before the serious terminating resistor. Note that these logic will
#13 48/MODE*
All other clocks
DD
if logic 1 is expected. The same 10 K
Output
tri-state
Output
tri-state
DD
Input
reaches 2.5V, the logic level that is present on these pins are
2.5V
- 12 -
Output
pull-low
Output
pull-low
Within 3 mS
@3.3V ) inside. The default state will be logic
Preliminary W83196S-14
connection to ground if a logic 0 is desired.
Output
resistor is recommended to be
VDD