MC68181 Datasheet, PDF (12/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

MC68181
Freescale Semiconductor, Inc.
AC Electrical Characteristics
AC ELECTRICAL CHARACTERISTICS
The timing waveforms in the AC Electrical Characteristics are tested with a V_IL
maximum of 0.2 × V_DD in V and a V_IH minimum of 0.7 × V_DD in V for all inputs. AC
timing specifications that are referenced to a device input signal are measured in
production with respect to the 50% point of the respective input signal’s transition.
MC68181 output levels are measured with the production test machine V_OL and V_OH
reference levels set at 0.3 × V_DD in V and 0.6 × V_DD in V, respectively.
INITIALIZATION TIMING
(V_DD = 1.8 to 3.6 V, TA = –30 to + 85°C)
Table 2-4 Initialization Timing
Characteristic
Conditions Symbol Min Max Unit
Oscillator Start-up Time
—
t_START
—
5
sec
RESET Hold Time
—
t_RESET
200
—
ns
RESET High to READY Low
—
t_RHRL
76,800 76,800
T
Oscillator Warmed Up to READY Low
C_L = 50pf
t_OWRL
—
1
sec
Note: T is one period of the 76.8 kHz clock source. From power-up, the oscillator start-up time can impact the availability
and period of clock strobes. This can affect the actual RESET high to READY low timing.
2-4
MC68181 Technical Data Sheet
MOTOROLA
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