W78E054D Datasheet, PDF (70/89 Pages) List of Unclassifed Manufacturers – 8-bit microcontroller

W78E054D/W78E052D Data Sheet
*2: Pins of ports 1~4 source a transition current when they are being externally driven from 1 to 0.
The transition current reaches its maximum value when V_IN is approximately 2V.
*3: Under steady state (non-transient) conditions, I_OL must be externally limited as follows:
Maximum I_OL per port pin: 20mA
Maximum I_OL per 8-bit port: 40mA
Maximum total I_OL for all outputs: 100mA
*4: If I_OH exceeds the test condition, V_OH will be lower than the listed specification.
If I_OL exceeds the test condition, V_OL will be higher than the listed specification.
*5: Tested while CPU is kept in reset state and EA=H, Port0=H.
Voltage
4.5-5.5V
4.5-5.5V
2.4V
2.4V
Max. Frequency
6T/12T mode
40MHz
12T
20MHz
6T
20MHz
12T
10MHz
6T
Frequency VS Voltage Table
Note
20.3 AC ELECTRICAL CHARACTERISTICS
The AC specifications are a function of the particular process used to manufacture the part, the ratings
of the I/O buffers, the capacitive load, and the internal routing capacitance. Most of the specifications
can be expressed in terms of multiple input clock periods (TCP), and actual parts will usually experi-
ence less than a 20 nS variation.
20.3.1 Clock Input Waveform
XTAL1
T_CH
T_CL
FOP, TCP
PARAMETER
SYMBOL MIN.
TYP. MAX.
Operating Speed
Clock Period
Clock High
Clock Low
Fop
0
-
40
TCP
25
-
-
Tch
10
-
-
Tcl
10
-
-
Notes:
1. The clock may be stopped indefinitely in either state.
2. The TCP specification is used as a reference in other specifications.
3. There are no duty cycle requirements on the XTAL1 input.
UNIT
MHz
nS
nS
nS
NOTES
1
2
3
3
- 70 -
Publication Release Date: Jun 9, 2015
Revision A13