UPD7225 Datasheet, PDF (40/52 Pages) NEC – PROGRAMMABLE LCD CONTROLLER/DRIVER

µPD7225
AC Characteristics (TA = 0 to +70 °C, VDD = 2.7 V to 5.5 V)
Item
Operating frequency
Oscillation frequency
High level clock pulse width
Low level clock pulse width
/SCK frequency
High level /SCK pulse width
Low level /SCK pulse width
/BUSY ↑→ /SCK hold time
SI set time (against /SCK ↑)
SI hold time (against /SCK ↑)
8th pulse of /SCK ↑→ /BUSY ↓
delay time
/CS ↓→ /BUSY ↓ delay time
/BUSY low level time
Symbol
fC
fOSC
tWHC
tWLC
tCYK
tWHK
tWLK
tHBK
tSIK
tHKI
tDKB
Condition
R = 180 kΩ ± 5%, VDD = 3 V ± 10 %
CL1, external clock
CL1, external clock
CL = 50 pF
tDCSB
tWLB
CL = 50 pF
tWHCS ≥ 48/fC^{Note 1} CL = 50 pF
C, /D set time (against 8th pulse
of SCK ↑)
C, /D hold time (against 8th pulse
of SCK ↑)
/CS hold time (against 8th pulse of
SCK ↑)
High level /CS pulse width
Low level /CS pulse width
/SYNC load capacitance
tSDK
tHKD
tHKCS
tWHCS
tWLCS
CLSY
tCYC = 7.1 µs
Notes 1. UNSYNCHRONIZED TRANSFER MOD
For SYNCHRONIZED TRANSFER MODE,
tWHCS ≥ (48/fC + AC driver frequency)
2. BLINKING ON
3. 8/fc
MIN. TYP. MAX. Unit
50
140
kHz
50
100
140
kHz
3
16
µs
3
16
µs
4
µs
1.8
µs
1.8
µs
0
ns
1
µs
1
µs
5
µs
5
µs
4
44 (57) 1/fC
Note 2
18
µs
1
µs
1
µs
Note 3
Note 3
µs
µs
50
pF
AC Timing Measurement Voltage
0.7VDD
0.3VDD
Measurement
points
0.7VDD
0.3VDD
40
Data Sheet S14308EJ6V0DS00