Data Sheet

Four Parallel Video Outputs for RED + IR Light Source

9.0 Switching Characteristics (25°C)

The switching characteristics (at 25°C) for the I/O clocks are shown in Figure 4. For the timing symbol definitions, see Table 6.

Figure 3: Timing Diagram

Note: Only one video output is shown because all four videos have identical electrical characteristics. The only physical difference between outputs is in the Section 4 output,

VOUT4. Section 4 has only six sensor chips, hence its active scan is shorter by 128 pixels.

Table 6: Timing Symbol Definitions for Figure 3 Timing Diagram

Parameters

Symbol

Min.

Typ.

Max.

Units

Clock cycle time

to

0.20

4.0

µs

Clock pulse width

tw

50

ns

Clock duty cycle

25

75

%

Prohibit crossing time of SP

tprh

0

ns

Data setup time

tds

20

ns

Data hold time

tdh

0

ns

Signal delay time

tdl

20

ns

Signal settling time

tsh

100

ns

Note:

(1)

"Prohibit crossing of start pulse" is to indicate that the start pulse should not be active high between any two consecutive high going clock pulse or two consecutive

low going clock pulses (see Figure 3). Only one high going clock under the active high start pulse initiates the internal shift register and it must not be active over

two high going clocks. All low going clock pulses will not initiate the shift register. To ensure that the start pulse will not be actively high during two consecutive

high going clocks, the circuit should be designed to keep the start pulse active only for one high going clock cycle.

5

AMI Semiconductor – Aug. 06, M-20612-001

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