LM3S1651 Datasheet, PDF (976/1033 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Electrical Characteristics
Figure 23-9. Watchdog Reset Timing
WDOG
Reset
(Internal)
R3
/Reset
(Internal)
Figure 23-10. MOSC Failure Reset Timing
MOSC
Fail Reset
(Internal)
R4
/Reset
(Internal)
23.7
23.8
23.8.1
On-Chip Low Drop-Out (LDO) Regulator
Table 23-6. LDO Regulator Characteristics
Parameter Parameter Name
Min
Nom
Max
Unit
C_LDO
External filter capacitor size for internal
power supply^a
1.0
-
3.0
µF
V_LDO
LDO output voltage
1.235
1.3
1.365
V
a. The capacitor should be connected as close as possible to pin 86.
Clocks
The following sections provide specifications on the various clock sources and mode.
PLL Specifications
The following tables provide specifications for using the PLL.
Table 23-7. Phase Locked Loop (PLL) Characteristics
Parameter Parameter Name
Min
Nom
Max
Unit
F_{REF_XTAL}
Crystal reference^a
3.579545
-
16.384
MHz
F_{REF_EXT}
F_PLL
T_READY
External clock reference^a
PLL frequency^b
PLL lock time
3.579545
-
16.384
-
400
-
0.562^c
-
1.38^d
MHz
MHz
ms
a. The exact value is determined by the crystal value programmed into the XTAL field of the Run-Mode Clock Configuration
(RCC) register.
b. PLL frequency is automatically calculated by the hardware based on the XTAL field of the RCC register.
c. Using a 16.384-MHz crystal
d. Using 3.5795-MHz crystal
976
January 21, 2012
Texas Instruments-Production Data