Texas Instruments AM1808 User Manual page 237

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6.30.1 Timer Electrical Data/Timing
Table 6-130. Timing Requirements for Timer Input
NO.
1 t Cycle time, TM64Px_IN12
c(TM64Px_IN12)
2 t Pulse duration, TM64Px_IN12 high
w(TINPH)
3 t Pulse duration, TM64Px_IN12 low
w(TINPL)
4 t Transition time, TM64Px_IN12
t(TM64Px_IN12)
(1) P = OSCIN cycle time in ns.
(2) C = TM64P0_IN12 cycle time in ns. For example, when TM64Px_IN12 frequency is 27 MHz, use C = 37.037 ns
(3) Whichever is smaller. P = the period of the applied signal. Maintaining transition times as fast as possible is recommended to improve
noise immunity on input signals.
4
TM64P0_IN12
Table 6-131. Switching Characteristics Over Recommended Operating Conditions for Timer Output
NO.
5 t Pulse duration, TM64P0_OUT12 high
w(TOUTH)
6 t Pulse duration, TM64P0_OUT12 low
w(TOUTL)
(1) P = OSCIN cycle time in ns.
TM64P0_OUT12
Copyright © 2010–2014, Texas Instruments Incorporated
1
2
4
Figure 6-80. Timer Timing
PARAMETER
Figure 6-81. Timer Timing
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(1) (2)
(see Figure
3
5
6
Peripheral Information and Electrical Specifications
AM1808
AM1808
6-80)
1.3V, 1.2V, 1.1V, 1.0V
UNIT
MIN MAX
4P ns
0.45C 0.55C ns
0.45C 0.55C ns
(3)
0.05C or 10 ns
(1)
1.3V, 1.2V, 1.1V, 1.0V
UNIT
MIN MAX
4P ns
4P ns
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