Product data

HD404818 Series
93
2. The oscillator stabilization time is the period from when V
CC
reaches 2.7 V (HD407L4818: V
CC
=
3.0 V) at power-on until the oscillator stabilizes. The time required to stabilize the oscillator (t
RC
)
must be obtained. Since t
RC
depends on the ceramic oscillator’s circuit constant and stray
capacitance, consult with the ceramic oscillator manufacturer.
3. See figure 48.
4. See figure 49. The unit t
cyc
is applied when the MCU is in standby mode or active mode.
5. See figure 50.
6. See figure 49. The unit t
subcyc
is applied when the MCU is in watch mode or subactive mode.
t
subcyc
= 244.14 µs (when a 32.768-kHz crystal oscillator is used)
7. The analog comparator stabilization time is the period from when D
12
/D
13
is placed in analog
input mode until the analog comparator stabilizes and correct data can be read.
8. Applies to HD40L4812, HD40L4814, HD40L4816, and HD40L4818.
9. Applies to HD407L4818.
Serial Interface Timing Characteristics
During Transmit Clock Output (HD40L4812, HD40L4814, HD40L4816, HD40L4818: V
CC
= 2.7 to 6
V; HD407L4818: V
CC
= 3 to 5.5 V; GND = 0 V, T
a
= –20°C to +75°C, unless otherwise specified)
Item Symbol Pin(s) Min Typ Max Unit Test Condition Notes
Transmit clock cycle time t
Scyc
SCK 1
t
cyc
/
t
subcyc
1, 2, 4
Transmit clock high and low
widths
t
SCKH
,
t
SCKL
SCK 0.5 t
Scyc
1, 2
Transmit clock rise and fall
times
t
SCKr
,
t
SCKf
SCK 200 ns 1, 2
Serial output data delay time t
DSO
SO 500 ns 1, 2
Serial input data setup time t
SSI
SI 300 ns 1
Serial input data hold time t
HSI
SI 300 ns 1