YMF781 Datasheet, PDF (8/14 Pages) YAMAHA CORPORATION – APL-1 Automobile sound PLayer-1

YMF781
●AC Characteristics
Input/Output level measurement conditions:
（unless otherwise specified）
V_IH ＝ 0.75 × VDD or 0.75 × VDDC
V_IL ＝ 0.25 × VDD or 0.25 × VDDC
V_OH ＝ 0.75 × VDD or 0.75 × VDDC
V_OL ＝ 0.25 × VDD or 0.25 × VDDC
・Reset and Clock Timing
RSTN, XI, and other input signals
Ｉtem
Symbol ï¼­in. ï¼´yp. ï¼­ax.
RSTN “L” pulse width
(When in power-up and in shut-down-cancel）
(When power supply and clock is in stable)
T_RSTW
20
100
RSTN (undefined→L) set-up time
T_RSTS
0
VDD→VDDC power up time difference
T_VSKW
0
3
XI Frequency
1 / T_XFREQ
6.144
XI Rising time and Falling time
T_XR , T_XF
20
XI High time
T_XH
60
XI Low time
T_XL
60
XI Input delay time
T_XIIN
1
XI Input time
T_XIINW
1
Internal clock frequency
1/T_CW
18.432
Input signals except XI Rising time and Falling time
T_R, T_F
15
Conditions: T_OP= -40 to 85℃, VDD= 3.0 to 3.6V, VDDC= 3.0 to 3.6V or 4.75 to 5.25V, Capacitor load=50pF
・Clock input to the XI terminal is necessary during the reset.
・Be sure to power VDD first when independent power supply is used for the supply of VDD and VDDC.
ï¼µnit
ms
μs
μs
ms
MHz
ns
ns
ns
ms
ms
MHz
ns
VDDC
The minimum of
recommended
operating voltage.
50%
T_VSKW
VDD
RSTN
XI
50%
T_RSTS
T_XIIN
T_RSTW
T_XIINW
V_IL= 0.25*VDD
The reset width is defined from a point that VDDC reaches to the minimum of recommended operating voltage.
RSTN input must be "L" level at the point where VDD reaches to 50%.
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