NS486SXF Datasheet, PDF (24/44 Pages) National Semiconductor (TI) – NS486TMSXF Optimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded Systems

3 0 Device Specifications (Continued)
LCD Output Specification Standard
Hysteresis Input Specification Standard
V_HYS e 200 mV
Switching thresholds not specified
TL H 12514 – 11
3 2 1 Power Ramp Times
TL H 12514–10
FIGURE 3-2 More Switching Specifications
FIGURE 3-3 Power Supply Rise and Fall
TABLE 3-1 V_DD Rise and Fall Times
Symbol
Parameter
Min
t_PF
V_DD Falling Time from 4 5V to 0V
5
t_PR
V_DD Rising Time from 0V to 4 5V
5
Note The rising falling rate is assumed linear
3 2 2 PWRGOOD and Power Rampdown Timing
TABLE 3-2 V_DD Rampdown vs PWRGOOD
Symbol
Parameter
Min
t_VPG
t_PGV
V_DD (4 5V) to PWGOOD High
1
PWGOOD Falling to V_DD (4 5V)
1
TL H 12514 – 12
Max
Unit
ms
ms
Max
Unit
ms
ms
Note The rising falling rate is assumed linear
FIGURE 3-4 PWGOOD in Relation to V_DD
TL H 12514 – 13
http www national com
24