參數(shù)資料
型號(hào)： S87C654-5F40
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： CMOS single-chip 8-bit microcontroller
中文描述： 8-BIT, UVPROM, 16 MHz, MICROCONTROLLER, CDIP40
文件頁(yè)數(shù)： 11/24頁(yè)
文件大?。?/td> 258K
代理商： S87C654-5F40
Philips Semiconductors
Product specification
83C654
CMOS single-chip 8-bit microcontroller
1998 Jan 06
11
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 V
IN
is approximately 2V.
8. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the V
s 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, I
must be externally limited as follows: Maximum I
= 10mA per port pin; Maximum
I
OL
= 26mA total for Port 0; Maximum I
OL
= 15mA total for Ports 1, 2, and 3; Maximum I
OL
= 71mA total for all output pins. If I
OL
exceeds the
test conditions, V
OL
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 V
OH
on ALE and PSEN to momentarily fall below the 0.9V
DD
specification when the
address bits are stabilizing.
11. I
DDMAX
for other frequencies can be derived from Figure 1, where FREQ is the external oscillator frequency in MHz. I
DDMAX
is given in mA.
40
30
20
10
0
0
4
8
12
16
(1) MAXIMUM OPERATING MODE: V
DD
= V
DDmax
(2) MAXIMUM IDLE MODE: V
DD
= V
DDmax
These values are valid within the specified
frequency range.
f
XTAL1
(MHz)
I
(mA)
Figure 1. I
DD
vs. Frequency
40
30
20
10
0
0
4
8
12
16
(2)
(1)
24
50
I
(mA)
f
XTAL1
(MHz)
(1) MAXIMUM OPERATING MODE: V
DD
= V
DDmax
(2) MAXIMUM IDLE MODE: V
DD
= V
DDmax
These values are valid within the specified
frequency range.
(1)
(2)
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