Datasheet

MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 2
42 Freescale Semiconductor
Timers
17 Timers
This section describes the DC and AC electrical specifications for the timers of the MPC8309.
17.1 Timer DC electrical characteristics
The following table provides the DC electrical characteristics for the MPC8309 timer pins, including TIN,
TOUT, TGATE, and RTC_PIT_CLK.
17.2 Timer AC timing specifications
The following table provides the timer input and output AC timing specifications.
The following figure
provides the AC test load for the timers.
Figure 32. Timers AC test load
Table 43. Timer DC electrical characteristics
Characteristic Symbol Condition Min Max Unit
Output high voltage V
OH
I
OH
= –6.0 mA 2. 4 — V
Output low voltage V
OL
I
OL
= 6.0 mA — 0.5 V
Output low voltage V
OL
I
OL
= 3.2 mA — 0.4 V
Input high voltage V
IH
—2.0OV
DD
+0.3 V
Input low voltage V
IL
— –0.3 0.8 V
Input current I
IN
0 V ≤ V
IN
≤ OV
DD
— ± 5 μA
Table 44. Timer input AC timing specifications
1
Characteristic Symbol
2
Min Unit
Timers inputs—minimum pulse width t
TIWID
20 ns
Notes:
1. Input specifications are measured from the 50% level of the signal to the 50% level of the rising edge of SYS_CLK_IN.
Timings are measured at the pin.
2. Timer inputs and outputs are asynchronous to any visible clock. Timer outputs should be synchronized before use by any
external synchronous logic. Timer inputs are required to be valid for at least t
TIWID
ns to ensure proper operation.
Output
Z
0
= 50 Ω
OV
DD
/2
R
L
= 50 Ω