Preliminary w78c51d – Rainbow Electronics W78C51D User Manual
Page 10
Preliminary W78C51D
- 10 -
DC Characteristics, continued
PARAMETER
SYM.
SPECIFICATION
TEST CONDITIONS
MIN.
MAX.
UNIT
Input
Input High Voltage
P1, P2, P3, P4
V
IH1
2.4
V
DD
+0.2
V
V
DD
= 5.5V
Input High Voltage
RST
V
IH2
3.5
V
DD
+0.2
V
V
DD
= 5.5V
Input High Voltage
XTAL1
[*4]
V
IH3
3.5
V
DD
+0.2
V
V
DD
= 5.5V
Output
Output Low Voltage
P1, P2, P3, P4
V
OL1
-
0.45
V
V
DD
= 4.5V
I
OL
= +2 mA
Output Low Voltage
P0, ALE,
PSEN
[*4]
V
OL2
-
0.45
V
V
DD
= 4.5V
I
OL
= +4 mA
Sink Current
P1, P2, P3, P4
I
SK1
4
10
mA
V
DD
= 4.5V
Vin = 0.45V
Sink Current
P0, ALE,
PSEN
I
SK2
8
16
mA
V
DD
= 4.5V
V
IN
= 0.45V
Output High Voltage
P1, P2, P3, P4
V
OH1
2.4
-
V
V
DD
= 4.5V
I
OH
= -100
µA
Output High Voltage
P0, ALE,
PSEN
[*4]
V
OH2
2.4
-
V
V
DD
= 4.5V
I
OH
= -400
µA
Source Current
P1, P2, P3, P4
I
SR1
-100
-250
µA
V
DD
= 4.5V
V
IN
= 2.4V
Source Current
P0, ALE,
PSEN
I
SR
2
-8
-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.