Maxim Dallas Semiconductor DS3171, General Description Manual, Page: 225 / 234

DS3171/DS3172/DS3173/DS3174
225
18.3 Misc Pin AC Characteristics
All AC timing characteristics are specified with a 25 pF capacitive load on all output pins, V
IH
= 2.4V and V
IL
= 0.8V.
The voltage threshold for all timing measurements is V
DD
/2. The generic timing definitions shown in Figure 18-1 ,
Figure 18-2 , Figure 18-3 , and Figure 18-6 apply to this interface .
Table 18-3. Misc Pin Timing
(V
DD
= 3.3V
±
5%, T
j
= -40
°
C to +85
°
C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Asynchronous Input High, Low Time t1-t2, t2 Note 1 500 ns
Asynchronous Input Rise, Fall Time t3 Note 1 10 ns
Note 1: TMEI (GPIO), PMU(GPIO), 8KREFI(GPIO) and
RST
inputs.
18.4 Overhead Port AC Characteristics
All AC timing characteristics are specified with a 25 pF capacitive load on all output pins, V
IH
= 2.4V and V
IL
= 0.8.
The voltage threshold for all timing measurements is V
DD
/2. The generic timing definitions shown in Figure 18-1 ,
Figure 18-2 , Figure 18-3 , and Figure 18-6 apply to this interface .
Table 18-4. Overhead Port Timing
(V
DD
= 3.3V
±
5%, T
j
= -40
°
C to +125
°
C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CLK Period t1 Note 1 500 ns
CLK Clock high and low time t1-t2, t2 Note 1 200 ns
DIN to CLK Setup Time t5 Note 2 20 ns
CLK to DIN Hold Time t6 Note 2 20 ns
CLK to DOUT Delay t7 Note 3 -20 20 ns
Note 1: TOHCLKn, ROHCLKn output clocks.
Note 2: TOHCLKn clock falling edge outputs to TOHn, TOHENn inputs.
Note 3: TOHCLKn, ROHCLKn clock falling edge outputs to TOHSOFn, ROHn, ROHSOF outputs.