w78c31b Winbond Electronics Corp America, w78c31b Datasheet - Page 7

• Manufacturer Part Number: w78c31b
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

DC Characteristics, continued
Notes:
*1. P0 and P2 are in external access mode.
*2. RST pin has an internal pull-down resistor of about 30 K .
*3. XTAL1 is a CMOS input and RST is a Schmitt trigger input.
AC 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 (T
usually experience less than a ¡Ó 20 nS variation. The numbers below represent the performance
expected from a 1.2 micron CMOS process when using 2 and 4 mA output buffers.
Clock Input Waveform
Notes:
1. The clock may be stopped indefinitely in either state.
2. The T
3. There are no duty cycle requirements on the XTAL1 input.
Input Low Voltage P1, P3
Input Low Voltage
XTAL1, RST
Input High Voltage P1, P3
Input High Voltage
XTAL1, RST
Operating Speed
Clock Period
Clock High
Clock Low
CP
PARAMETER
PARAMETER
specification is used as a reference in other specifications.
(*3)
(*3)
XTAL1
SYMBOL
V
V
V
V
SYMBOL
IH1
IH2
IL1
IL2
F
T
T
T
OP
CH
CP
CL
V
V
V
V
TEST CONDITIONS
DD
DD
DD
DD
T
= 4.5V
= 4.5V
= 5.5V
= 5.5V
CH
- 7 -
MIN.
F
25
10
10
OP,
0
T
CP
T
TYP.
CL
-
-
-
-
Publication Release Date: October 1997
MIN.
2.4
3.5
0
-
MAX.
SPECIFICATION
40
-
-
-
TYP.
CP
-
-
-
-
), and actual parts will
UNIT
MHz
nS
nS
nS
W78C31B
V
V
MAX.
DD
DD
0.8
0.8
+0.2
+0.2
Revision A3
NOTES
UNIT
1
2
3
3
V
V
V
V