W921E400A Datasheet, PDF (40/53 Pages) Winbond – 4-BIT MICROCONTROLLER

W921E400A/W921C400
8.2 AC Characteristics
W921E400A EPROM TYPE
(VDD−VSS = 3.0V, FOSC = 4.0 MHz, TA = 25° C, all outputs unloaded)
PARAMETER
SYMBOL CONDITIONS
FOSC1
FOSC2
Operating Frequency
FOSC3 _{OSCI, OSCO}
FOSC4
FOSC5
Instruction Cycle Time
TI
One Machine Cycle
Serial Port Data Ready
TDR
−
Time
Serial Port Data Hold
TDH
−
Time
RESET Active Width
TRAW
−
ROW 1 Frequency
(697 Hz)
FROW1
FOSC = 4 MHz,
2 MHz, 800 KHz,
400 KHz
FOSC = 3.58 MHz
ROW 2 Frequency
FROW2 same as ROW1
(770 Hz)
ROW 3 Frequency
FROW3
''
(852 Hz)
ROW 4 Frequency
FROW4
''
(941 Hz)
COL 1 Frequency
FCOL1
''
(1209 Hz)
COL 2 Frequency
FCOL2
''
(1336 Hz)
COL 3 Frequency
FCOL3
''
(1477 Hz)
COL 4 Frequency
FCOL4
''
(1633 Hz)
Oscillator Start Time
TOST
OSCO
MIN.
−
−
−
−
−
−
200
200
2
-0.5
-0.92
-0.5
-0.92
-0.5
-0.92
-0.5
-0.92
-0.5
-0.92
-0.5
-0.92
-0.5
-0.92
-0.5
-0.92
−
TYP.
400
800
2
3.58
4
4/FOSC
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
2¹⁷/FOSC
MAX.
−
−
−
−
−
−
−
−
−
+0.5
+0.92
+0.5
+0.92
+0.5
+0.92
+0.5
+0.92
+0.5
+0.92
+0.5
+0.92
+0.5
+0.92
+0.5
+0.92
−
UNIT
KHz
KHz
MHz
MHz
MHz
S
nS
nS
TI
%
%
%
%
%
%
%
%
mS
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