87C654 Philips Semiconductors, 87C654 Datasheet - Page 12

• Manufacturer Part Number: 87C654
• Description: 80C51 8-bit microcontroller 8K/16K/ 256 OTP/ I2C
• Manufacturer: Philips Semiconductors

1. The input threshold voltage of P1.6 and P1.7 (SIO1) meets the I
2. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the V
3. Under steady state (non-transient) conditions, I
4. Capacitive loading on ports 0 and 2 may cause the V
5. 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
6. See Figures 9 through 11 for I
7. The operating supply current is measured with all output pins disconnected; XTAL1 driven with t
8. The idle mode supply current is measured with all output pins disconnected; XTAL1 driven with t
9. The power-down current is measured with all output pins disconnected; XTAL2 not connected; Port 0 = P1.6 = P1.7 = V
10. 2V
Philips Semiconductors
NOTES FOR DC ELECTRICAL CHARACTERISTICS:
1996 Aug 16
CMOS single-chip 8-bit microcontroller
logic 0 while an input voltage above 0.7V
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.
I
test conditions, V
address bits are stabilizing.
maximum value when V
V
V
EA = RST = V
OL
IL
IH
= 26mA total for Port 0; Maximum I
= V
= V
V
PD
SS
CC
+ 0.5V; V
–0.5V; XTAL2 not connected; Port 0 = P1.6 = P1.7 = V
V
CC
SS
max.
. See Figure 11.
OL
IH
may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions.
= V
IN
CC
is approximately 2V.
–0.5V; XTAL2 not connected; EA = RST = Port 0 = P1.6 = P1.7 = V
CC
test conditions.
OL
CC
= 15mA total for Ports 1, 2, and 3; Maximum I
will be recognized as a logic 1.
OL
must be externally limited as follows: Maximum I
OH
on ALE and PSEN to momentarily fall below the 0.9V
2
C specification, so an input voltage below 0.3V
CC
12
; EA = RST = V
SS
; f
OL
CLK
= 71mA total for all output pins. If I
OL
OL
= 16MHz. See Figure 10.
s of ALE and ports 1 and 3. The noise is due
can exceed these conditions provided that no
r
CC
r
= t
= t
OL
; f
f
f
CLK
= 10ns;
= 10ns; V
= 10mA per port pin; Maximum
= 16MHz. See Figure 9.
CC
IL
CC
specification when the
= V
will be recognized as a
SS
+ 0.5V;
CC
Product specification
;
87C654
OL
exceeds the