ST7920 Datasheet, PDF (40/49 Pages) List of Unclassifed Manufacturers – ST7920

ST7920
AC Characteristics (T_A = -30℃ ~ 85℃, V_DD = 4.5V) Parallel Mode Interface
Symbol Characteristics
Test Condition
Min. Typ. Max. Unit
Internal Clock Operation
f_OSC
OSC Frequency
R = 33KΩ
480 540 600 KHz
External Clock Operation
f_EX
External Frequency
-
480 540 600 KHz
Duty Cycle
-
45 50 55
%
T_R,T_F
Rise/Fall Time
-
-
-
0.2
µs
Write Mode (Writing data from MPU to ST7920)
T_C
Enable Cycle Time
Pin E
1200 -
-
ns
T_PW Enable Pulse Width
Pin E
140
-
-
ns
T_R,T_F Enable Rise/Fall Time
Pin E
-
-
25
ns
T_AS Address Setup Time
Pins: RS,RW,E
10
-
-
ns
T_AH
Address Hold Time
Pins: RS,RW,E
20
-
-
ns
T_DSW
Data Setup Time
Pins: DB0 - DB7
40
-
-
ns
T_H
Data Hold Time
Pins: DB0 - DB7
20
-
-
ns
Read Mode (Reading Data from ST7920 to MPU)
T_C
Enable Cycle Time
Pin E
1200 -
-
ns
T_PW Enable Pulse Width
Pin E
140
-
-
ns
T_R,T_F Enable Rise/Fall Time
Pin E
-
-
25
ns
T_AS Address Setup Time
Pins: RS,RW,E
10
-
-
ns
T_AH
Address Hold Time
Pins: RS,RW,E
20
-
-
ns
T_DDR
Data Delay Time
Pins: DB0 - DB7
-
-
100
ns
T_H
Data Hold Time
Pins: DB0 - DB7
20
-
-
ns
Interface Mode with LCD Driver(ST7921)
T_CWH
T_CWL
T_CST
T_SU
T_DH
T_DM
Clock Pulse with High
Clock Pulse with Low
Clock Setup Time
Data Setup Time
Data Hold Time
M Delay Time
Pins: CL1, CL2
Pins: CL1, CL2
Pins: CL1, CL2
Pin: D
Pin: D
Pin: M
800
-
-
ns
800
-
-
ns
500
-
-
ns
300
-
-
ns
300
-
-
ns
-1000 - 1000 ns
V4.0
40/49
2008/08/18