87C54-20 Intel Corporation, 87C54-20 Datasheet - Page 9

• Manufacturer Part Number: 87C54-20
• Description: CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 16 KBYTES USER PROGRAMMABLE EPROM
• Manufacturer: Intel Corporation

NOTES
1 Capacitive loading on Ports 0 and 2 may cause noise pulses to be superimposed on the V
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 applications where capacitance loading exceeds 100 pFs the noise pulse on the ALE
signal may exceed 0 8V In these cases it may be desirable to qualify ALE with a Schmitt Trigger or use an Address Latch
with a Schmitt Trigger Strobe input
2 Capacitive loading on Ports 0 and 2 cause the V
address lines are stabilizing
3 See Figures 6–9 for test conditions Minimum V
4 Typicals are based on limited number of samples and are not guaranteed The values listed are at room temperature and
5V
5 Under steady state (non-transient) conditions I
If I
than the listed test conditions
I
Active Mode
Idle Mode
Where Osc Freq is in MHz I
All other pins disconnected
TCLCH
CC
Figure 10 Clock Signal Waveform for I
OL
I
I
CC
CC
Max at other frequencies is given by
exceeds the test condition V
Figure 8 I
Maximum I
Maximum I
Maximum total I
Max
Max
e
TCHCL
e
e
Figure 6 I
(1 25
(0 5
OL
OL
e
CC
c
c
per port pin
per 8-bit port
Osc Freq)
5 ns
Osc Freq)
Test Condition Idle Mode
OL
CC
for all output pins
CC
Ports 1 2 and 3
vs Frequency
is in mA
a
a
4
8
OL
Port 0
may exceed the related specification Pins are not guaranteed to sink current greater
270849–7
270849–9
26 mA
10mA
15 mA
CC
71 mA
OL
CC
OH
Tests in Active and Idle Modes TCLCH
must be externally limited as follows
for Power Down is 2V
on ALE and PSEN to drop below the 0 9 V
Figure 9 I
All other pins disconnected
TCLCH
All other pins disconnected
Figure 7 I
e
TCHCL
CC
Test Condition Power Down Mode
CC
AUTOMOTIVE 87C54 87C54-20
V
e
CC
Test Condition Active Mode
5 ns
e
2 0V to 6 0V
OL
s of ALE and Ports 1 2 and
CC
270849 –11
e
specification when the
TCHCL
270849 –10
270849 – 8
e
5 ns
9