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PC-1500
at http:f/www.PC-1500.info
reloading the original
control
byte
in
the Control Register with I.he TR bit= 0, thus terminating the
REQUEST
TO SEND
(RTS) signal.
SERIAL DATA OUT (SDO)
can
be
held
low
by
setting the
BRcAK bit
in the Control
Rcgister($ee
Fig. 6).
SDO is held low
until
the
BREAK
bit
is
reset
DYNAMIC
ELECTRICAL CHARACTERISTICS at
TA
.
-
40 tC>
+85°C,
Voo
±5%,
t,,
tf-20ns,
VIH
.
0.7 Yoo·
VIL= 0.3
Voo·
CL
•
100
pF. See
Figs.
1and2.
LIMITS
CHARACTERISTIC
Voo
COPl8S4A
CDP· l854AC
UNITS
(V)
Typ."
•
•
•
Max.
Typ.
Max.
T
rransmitter
Timing
-
MOOE I
Minimum
Clock
Period
ICC
5
2so
310
2SO
310
10
125
ISS
ns
-
-
Minimum
P11lse Width:
lCL
s
I
00
125
100
125
ns
Clock Low Level
10
75
100
-
-
Clock
High
Level
l(;H
s
I
00
125
JOO
125
10
75
100
ns
-
-
TPB
ITT
5
100
150
100
ISO
10
so
75
ns
-
-
Minimum
Setup Time:
ITC
s
175
225
175
22S
TPB
to Clock
10
90
I
SO
ns
-
-
Propagation Delay
Time:
tco
s
300
450
300
450
ns
Clock to
Data
Start
Bit
JO
I
SO
225
-
-
'rPB
to
THRJO
t·1TH
5
200
300
200
300
10
100
150
ns
-
-
Clock
to
THRE
tent
5
200
300
200
300
ns
10
100
150
-
-
CPU lnicrface
-
W~TE
Timing
-
MODE I
Minimum
Pulse
Wid01:
ITT
5
100
ISO
100
ISO
TPB
so
75
ns
10
-
-
Minimum
Setup Time:
tRSW
5
50
74
50
7S
RSEL
to
Write
10
25
40
ns
-
-
Data to
Write
tow
5
-
100
-
75
100
-75
ns
10
-SO
-
35
-
-
Minimum
Hold
Time:
IWRS
s
so
75
so
75
ns
RSEL
after
Write
10
25
40
-
-
Data after
Write
two
5
15
12S
15
125
10
40
60
ns
-
-
•
Typical
values
are
for T
11
=
2S°C
and nominal
voltages.
•
Maximum limi
ts
of minimum
characteristics
are
the values
above
which all devices
function.
10
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not
sale
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