W78C54 Ver la hoja de datos (PDF) - Winbond
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W78C54 Datasheet PDF : 22 Pages
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W78C54
DC Characteristics, continued
PARAMETER
SYM.
SPECIFICATION
MIN.
MAX.
UNIT
TEST CONDITIONS
Input High Voltage
VIH1
2.4
VDD +0.2
V
VDD = 5.5V
P0, P1, P2, P3, P4, EA
Input High Voltage
VIH2
3.5
VDD +0.2
V
VDD = 5.5V
RST
Input High Voltage
VIH3
3.5
VDD +0.2
V
VDD = 5.5V
XTAL1 [*4]
Output Low Voltage
VOL1
-
0.45
V
VDD = 4.5V
P1, P2, P3, P4
IOL = +2 mA
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
VOL2
ISK1
ISK2
VOH1
VOH2
ISR1
ISR2
-
4
10
2.4
2.4
-120
-10
0.45
8
14
-
-
-180
-14
V
VDD = 4.5V
IOL = +4 mA
mA
VDD = 4.5V
Vs = 0.45V
mA
VDD = 4.5V
Vs = 0.45V
V
VDD = 4.5V
IOH = -100 µA
V
VDD = 4.5V
IOH = -400 µA
µA
VDD = 4.5V
Vs = 2.4V
mA
VDD = 4.5V
Vs = 2.4V
Notes:
*1. RST pin is a Schmitt trigger input. RST has internal pull-low resistors of about 30 KΩ.
*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
current reaches its maximum value when VIN approximates to 2V.
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 (TCP), and actual parts will
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.
- 13 -
Publication Release Date: December 1997
Revision A2
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