S-7760A Datasheet, PDF (32/53 Pages) Seiko Instruments Inc – PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E²PROM CIRCUIT)
S-7760A
Rev.1.3_00
4. 2 Initialization time
The S-7760A initializes at the same time when the power supply voltage is raised. Input instructions to the S-7760A
after initialization. The S-7760A does not accept any instruction during initialization.
Figure 35 shows the initialization time of the S-7760A.
100 m
10 m
S-7760A initialization
time (tINIT) Max.
1.0 m
[s]
100 µ
10 µ
1.0 µ
1.0 µ 10 µ 100 µ 1.0 m 10 m 100 m
Rise time (t_RISE)
[s]
Figure 35 Initialization Time of S-7760A
5. Data hold time (t_{HD. DAT} = 0 ns)
If SCL and SDA of the S-7760A are changed at the same time, the timing which takes to reach this IC slightly lags
due to a load on the bus line. As a result, the change in the SDA precedes a falling edge of SCL so that S-7760A
may recognize a start/stop condition.
To avoid this, in the S-7760A, it is recommended to set the delay time of over 0.3 µs for a falling edge of SCL.
In its specs, it is described as the S-7760A works at 0 ns of data hold time, however, take account into the above
action in actual use.
t_{HD. DAT} = 0.3 µs Min.
SCL
SDA
Figure 36 Data Hold Time
32
Seiko Instruments Inc.