RA8835A
Version 1.0
Dot Matrix LCD Controller
VDD = 2.7 to 4.5V, VSS = 0V, Ta = –20 to 75℃
Rating
Typ.
3.3
Unit
Parameter
Supply voltage
Symbol
Condition
Min.
Max.
V
VDD
VOH
2.7
4.5
V
Register data retention
voltage
2.0
—
6.0
V
Input leakage current
Output leakage current
ILI
VI = VDD. See note 5.
VI = VSS. See note 5.
—
—
0.05
0.10
2.0
5.0
µA
µA
ILO
VDD = 3.5 V.
See note 4.
—
—
3.5
—
—
Operating supply current
Iopr
mA
See note 4.
7.0
Sleep mode,
Quiescent supply current
IQ
—
0.05
20.0
µA
VOSC1= VCS = VRD = VDD
Oscillator frequency
fOSC
fCL
1.0
1.0
—
—
16.0
16.0
MHz
MHz
Measured at crystal,
47.5% duty cycle.
See note 6.
External clock frequency
Oscillator feedback
resistance
Rf
0.7
—
3.0
MΩ
Input
HIGH-level input voltage
LOW-level input voltage
Output
VIHC
VILC
See note 1, 2
See note 1, 2
0.5 VDD
VSS
—
—
VDD
V
V
0.2 VDD
IOH= 4.0 mA.
See note 1, 2
IOL= -2 mA.
See note 1, 2
HIGH-level output voltage
VOHC
VOLC
VDD – 0.4
—
—
—
—
V
V
LOW-level output voltage
VSS + 0.4
Schmitt-trigger
Rising-edge threshold
voltage
Falling-edge threshold
voltage
VT+
VT–
See note 3.
See note 3.
0.5 VDD
0.2 VDD
0.7 VDD
0.3 VDD
0.8 VDD
0.5 VDD
V
V
Notes
1. CS, RD , WR , A0, SEL1, SEL2 and TEST are inputs. VA0 to VA15, ( VRD), ( VWR ), ( VCE ), YD,
XD0 to XD3, XSCL, LP, WF, YDIS are outputs.
2. D0 to D7, VD0 to VD7 are Bi-direction pins.
3. The RES are Schmitt-trigger inputs. The pulse width on (RES ) must be at least 10*tc. Note that
pulses of more than a few seconds will cause DC voltages to be applied to the LCD panel.
4. fOSC = 10 MHz, no load (no display memory), internal character generator, 256x200 pixel display.
The operating supply current can be reduced by approximately 1mA by setting both CLO and the
display OFF.
5. VD0 to VD7 and D0 to D7 have internal feedback circuits so that if the inputs become high-
impedance, the input state immediately prior to that is held. Because of the feedback circuit, input
current flow occurs when the inputs are in an intermediate state.
6. Because the oscillator circuit input bias current is in the order of µA, design the printed circuit board
so as to reduce leakage currents.
RAiO TECHNOLOGY INC.
www.raio.com.tw
80/88
RAIO [ RAIO TECHNOLOGY INC. ]
