W921E840A Datasheet, PDF (45/58 Pages) Winbond – 4-BIT MICROCONTROLLER

W921E840A/W921C840
8.2 AC Characteristics
W921E840A EPROM Type
(VDD−VSS = 3.0V, FOSC = 4.0 MHz, TA = 25° C, all outputs unloaded)
PARAMETER
SYM.
CONDITIONS
FOSC1
FOSC2
Operating Frequency
FOSC3 _{OSCI, OSCO}
FOSC4
FOSC5
Operating Sub-frequency
FSUB _{XT, XT}
Instruction Cycle Time
TI
One Machine
Cycle
Serial Port Data Ready Time TDR
−
Serial Port Data Hold Time
TDH
−
RESET Active Width
TRAW
−
ROW 1 Frequency (697Hz)
FROW1
FOSC = 4 Mhz,
2MHz, 800 KHz,
400 KHz
FOSC = 3.58 MHz
ROW 2 Frequency (770 Hz) FROW2 Same as ROW1
ROW 3 Frequency (852 Hz) FROW3 Same as ROW1
ROW 4 Frequency (941 Hz) FROW4 Same as ROW1
COL 1 Frequency (1209 Hz) FCOL1 Same as ROW1
COL 2 Frequency (1336 Hz) FCOL2 Same as ROW1
COL 3 Frequency (1477 Hz) FCOL3 Same as ROW1
COL 4 Frequency (1633 Hz) FCOL4 Same as ROW1
Oscillator Start Time
TOST _OSCO
MIN.
−
−
−
−
−
−
−
TYP.
400
800
2
3.58
4
32.768
4/FOSC
MAX.
−
−
−
−
−
−
−
UNIT
KHz
KHz
MHz
MHz
MHz
KHz
S
200
−
200
−
2
−
−
nS
−
nS
−
TI
-0.5
−
+0.5
%
-0.92
−
+0.92
-0.5
−
+0.5 %
-0.92
−
+0.92
-0.5
−
+0.5 %
-0.92
−
+0.92
-0.5
−
+0.5 %
-0.92
−
+0.92
-0.5
−
+0.5 %
-0.92
−
+0.92
-0.5
−
+0.5 %
-0.92
−
+0.92
-0.5
−
+0.5 %
-0.92
−
+0.92
-0.5
−
+0.5 %
-0.92
−
+0.92
−
17
2 /FOSC
−
mS
- 45 -
Publication Release Date: July 1999
Revision A3