W78E54-16 Winbond, W78E54-16 Datasheet - Page 14

• Manufacturer Part Number: W78E54-16
• Description: 8-BIT MICROCONTROLLER
• Manufacturer: Winbond

DC Characteristics, continued
Notes:
1. RST pin is a Schmitt trigger input. RST has internal pull-low resistors of about 30 K .
3. P0, ALE and /PSEN are tested in the external access mode.
4. XTAL1 is a CMOS input.
5. Pins of P1, P2, P3, P4 can source a transition current when they are being externally driven from 1 to 0. The transition
reaches its maximum value when V
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 20 nS variation. The numbers below represent the performance
expected from a 0.8 micron CMOS process when using 2 and 4 mA output buffers.
Clock Input Waveform
Output Low Voltage
P0, ALE, PSEN [*3]
Sink Current
P1, P2, P3, P4
Sink Current
P0, ALE, PSEN
Output High Voltage
P1, P2, P3, P4
Output High Voltage
P0, ALE, PSEN [*3]
Source Current
P1, P2, P3, P4
Source Current
P0, ALE, PSEN
PARAMETER
XTAL1
IN
approximates to 2V.
SYM.
V
V
V
I
I
I
I
SR1
SR2
SK1
SK2
OH1
OH2
OL2
MIN.
-120
SPECIFICATION
2.4
2.4
10
-8
4
-
T
CH
- 14 -
F
OP,
MAX.
-250
0.45
-14
12
20
-
-
T
CP
T
CL
UNIT
mA
mA
mA
V
V
V
A
V
I
V
Vs = 0.45V
V
Vs = 0.45V
V
I
V
I
V
Vs = 2.4V
V
Vs = 2.4V
CP
OL
OH
OH
DD
DD
DD
DD
DD
DD
DD
TEST CONDITIONS
), and actual parts will
= +4mA
= -100 A
= -400 A
= 4.5V
= 4.5V
= 4.5V
= 4.5V
= 4.5V
= 4.5V
= 4.5V
W78E54
current