User guide

W78C801
- 12 -
DC Characteristics, continued
PARAMETER SYM. SPECIFICATION TEST CONDITIONS
MIN. MAX. UNIT
Input High Voltage
P1, P2, P3, P4
VIH1 2.4 VDD +0.2 V VDD = 5.5V
Input High Voltage
RST
VIH2 3.5 VDD +0.2 V VDD = 5.5V
Input High Voltage
XTAL1
[*4]
VIH3 3.5 VDD +0.2 V VDD = 5.5V
Output
Output Low Voltage
P1, P2, P3, P4
V
OL1 - 0.45 V VDD = 4.5V
I
OL = +2 mA
Output Low Voltage
P0, ALE,
PSEN
[*4]
VOL2 - 0.45 V VDD = 4.5V
I
OL = +4 mA
Sink Current
P1, P2, P3
[5]
, P4<0:4>
Isk
1 412mAVDD = 4.5V
V
IN = 0.45V
Sink Current
P0, ALE,
PSEN , P4<5:6>
Isk
2 10 20 mA VDD = 4.5V
V
IN = 0.45V
Sink Current
P3.4 to P3.7 in High-drive Mode
Isk3 15 24 mA VDD = 4.5V
V
IN = 0.45V
Output High Voltage
P1, P2, P3, P4
VOH1 2.4 - V VDD = 4.5V
I
OH = -100 µA
Output High Voltage
P0, ALE,
PSEN
[*4]
VOH2 2.4 - V VDD = 4.5V
I
OH = -400 µA
Source Current
P1, P2, P3, P4<0:4>
Isr1 -120 -250
µA
VDD = 4.5V
V
IN = 2.4V
Source Current
P0, ALE,
PSEN , P4<5:6>
Isr2 -10 -14 mA V
DD = 4.5V
V
IN = 2.4V
Notes:
*1. RST pin has an internal pull-down.
*2. Pins of P1 and P3 can source a transition current when they are being externally driven from 1 to 0.
*3. RST is a Schmitt trigger input and XTAL1 is a CMOS input.
*4. P0, P2, ALE and
PSEN are tested in the external access mode.
*5. P3.4 to P3.7 are in normal mode.