ra8835a RAIO Technology Inc., ra8835a Datasheet - Page 84

• Manufacturer Part Number: ra8835a
• Description: Dot Matrix Lcd Controller
• Manufacturer: RAIO Technology Inc.

RAiO TECHNOLOGY INC.
Version 1.0
10.3-4 Display Memory Write Timing
VA0 to VA15
VD0 to VD7
VR/W
EXT￠ O
Note: VD0 to VD7 are latching input/outputs. While the bus is high impedance, VD0 to VD7 retain
VCE
EXT Φ0
VD0 to
Signal
VA0 to
VWR
VA15
VCE
VD7
the write data until the data read from the memory is placed on the bus.
Symbol
t
t
t
t
t
t
t
t
t
CYW
WSC
WHC
t
t
AHC
ASC
t
DSC
DHC
t
AH2
DH2
t
CE
CA
AS
W
C
t
AS
t
Clock period
pulse width
pulse width
Write cycle time
Address hold time
from falling edge of
Address setup time to
falling edge of
Address hold time
from rising edge of
Address setup time to
falling edge of
Address hold time
from rising edge of
Write setup time to
falling edge of
Write hold time from
falling edge of
Data input setup time
to falling edge of
Data input hold time
from falling edge of
Data hold time from
rising edge of
C
VCE
VCE
VCE
VCE
VWR
VCE
VCE
t
t
W
ASC
t
W SC
t
DSC
Parameter
HIGH-level
LOW-level
VWR
VCE
VWR
VCE
VCE
84/88
2t
2t
2t
2t
V
t
t
t
t
C
C
C
C
DD
Min.
55.5
C
C
C
C
3tC
10
– 50
– 70
– 80
– 85
0
0
5
– 30
– 30
– 20
– 30
t
AHC
= 4.5 to 5.5V
t
t
t
DHC
CE
W HC
Max.
50
—
—
—
—
—
—
—
—
—
—
—
—
—
2t
2t
t
t
2t
t
2t
V
t
C
C
C
C
Min.
62.5
DD
C
C
C
C
– 110
– 115
– 125
3t
– 50
10
0
0
5
– 30
– 40
– 20
– 30
= 2.7 to 4.5V
C
t
Dot Matrix LCD Controller
AH2
t
t
DH 2
CA
Max.
50
—
—
—
—
—
—
—
—
—
—
—
—
—
RA8835A
www.raio.com.tw
Unit
Ta = –20 to 75 ℃
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CL = 100
pF
Condition