P83C654IBA Ver la hoja de datos (PDF) - Philips Electronics
Número de pieza
componentes Descripción
Fabricante
P83C654IBA Datasheet PDF : 24 Pages
| |||
Philips Semiconductors
CMOS single-chip 8-bit microcontroller
Product specification
83C654
7. 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
maximum value when VIN is approximately 2V.
8. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the VOLs of ALE and ports 1 and 3. The noise is due
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.
9. Under steady state (non-transient) conditions, IOL must be externally limited as follows: Maximum IOL = 10mA per port pin; Maximum
IOL = 26mA total for Port 0; Maximum IOL = 15mA total for Ports 1, 2, and 3; Maximum IOL = 71mA total for all output pins. If IOL exceeds the
test conditions, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions.
10. Capacitive loading on ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the 0.9VDD specification when the
address bits are stabilizing.
11. IDDMAX for other frequencies can be derived from Figure 1, where FREQ is the external oscillator frequency in MHz. IDDMAX is given in mA.
40
IDD
(mA)
30
50
IDD
(mA)
40
(1)
30
20
(1)
20
10
10
(2)
(2)
0
0
4
8
12
16
fXTAL1 (MHz)
(1) MAXIMUM OPERATING MODE: VDD = VDDmax
(2) MAXIMUM IDLE MODE: VDD = VDDmax
These values are valid within the specified
frequency range.
0
0
4
8
12
(1) MAXIMUM OPERATING MODE: VDD = VDDmax
(2) MAXIMUM IDLE MODE: VDD = VDDmax
These values are valid within the specified
frequency range.
16
24
fXTAL1 (MHz)
Figure 1. IDD vs. Frequency
1998 Jan 06
11
Share Link: 