ST7920
℃
℃
~ 85 , VDD = 2.7V) Parallel Mode Interface
AC Characteristics (TA = -30
Symbol
fOSC
Characteristics
Test Condition
Min.
Typ. Max.
Unit
Internal Clock Operation
R = 18K
OSC Frequency
W
470
530
590
KHz
External Clock Operation
fEX
External Frequency
Duty Cycle
-
-
-
470
45
-
530
50
-
590
55
KHz
%
s
m
TR,TF
Rise/Fall Time
0.2
Write Mode (Writing data from MPU to ST7920)
TC
Enable Cycle Time
Enable Pulse Width
Pin E
1800
160
-
-
-
-
-
-
-
-
-
-
ns
ns
ns
ns
ns
ns
ns
TPW
Pin E
TR,TF Enable Rise/Fall Time
Pin E
25
-
TAS
TAH
TDSW
TH
Address Setup Time
Address Hold Time
Data Setup Time
Data Hold Time
Pins: RS,RW,E
Pins: RS,RW,E
Pins: DB0 - DB7
Pins: DB0 - DB7
10
20
-
40
-
20
-
Read Mode (Reading Data from ST7920 to MPU)
TC
Enable Cycle Time
Enable Pulse Width
Pin E
1800
320
-
-
-
-
-
-
-
-
-
ns
ns
ns
ns
ns
ns
ns
TPW
Pin E
-
25
-
TR,TF Enable Rise/Fall Time
Pin E
TAS
TAH
TDDR
TH
Address Setup Time
Address Hold Time
Data Delay Time
Data Hold Time
Pins: RS,RW,E
Pins: RS,RW,E
Pins: DB0 - DB7
Pins: DB0 - DB7
10
20
-
-
260
-
20
Interface Mode with LCD Driver(ST7921)
TCWH
TCWL
TCST
TSU
Clock Pulse with High
Clock Pulse with Low
Clock Setup Time
Data Setup Time
Data Hold Time
Pins: CL1, CL2
Pins: CL1, CL2
Pins: CL1, CL2
Pin: D
800
800
-
-
-
-
-
-
-
ns
ns
ns
ns
ns
ns
-
500
-
300
-
-
TDH
Pin: D
300
TDM
M Delay Time
Pin: M
-1000
1000
V4.0
41/49
2008/08/18
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
