87C575 Philips Semiconductors, 87C575 Datasheet - Page 27

• Manufacturer Part Number: 87C575
• Description: 80C51 8-bit microcontroller family 8K/256 OTP/ROM/ROMless/ 4 comparator/ failure detect circuitry/ watchdog timer
• Manufacturer: Philips Semiconductors

Philips Semiconductors
NOTES TO THE DC ELECTRICAL CHARACTERISTICS TABLE:
1. Typical ratings are not guaranteed. The values listed are at room temperature, 5V.
2. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the V
3. Capacitive loading on ports 0 and 2 may cause the V
4. Pins of ports 1, 2 and 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its
5. I
6. See Figures 30 through 33 for I
7. Load capacitance for port 0, ALE, and PSEN = 100pF, load capacitance for all other outputs = 80pF.
8. Under steady state (non-transient) conditions, I
9. Specification applies to Port 2 when P2OD bit is set.
10. 15pF MAX for the EA/V
1998 May 01
80C51 8-bit microcontroller family
8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer
to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-to-0 transitions during bus operations. In the
worst cases (capacitive loading > 100pF), the noise pulse on the ALE pin may exceed 0.8V. In such cases, it may be desirable to qualify
ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input. I
single output sinks more than 5mA and no more than two outputs exceed the test conditions.
address bits are stabilizing.
maximum value when V
If I
test conditions.
CC
OL
MAX at other frequencies can be determined from Figure 29.
Maximum I
Maximum I
Maximum total I
exceeds the test condition, V
OL
OL
per port pin:
per 8-bit port:
OL
for all outputs:
PP
IN
is between V
and P0.0 pins.
CC
test conditions.
OL
may exceed the related specification. Pins are not guaranteed to sink current greater than the listed
IH
10mA
26mA
71mA
and V
OL
IL
.
must be externally limited as follows:
OH
on ALE and PSEN to momentarily fall below the 0.9V
27
OL
OL
s of ALE and ports 1 and 3. The noise is due
can exceed these conditions provided that no
80C575/83C575/
CC
specification when the
Product specification
87C575