ELECTRICAL CHARACTERISTICS (Voltages referenced to Vss) (Con’t)
Characteristic
SYMBOL
V
DD
3.0
10.0
18.0
3.0
10.0
18.0
3.0
10.0
18.0
-
-
-
3.0
10.0
18.0
Min
-
-
-
-
-
-
-
-
Max
1.8
4.5
8.0
2.6
5.3
5.9
7.2
16.0
15.9
-
-
-
284
98
87
Min
-
-
-
-
-
-
-
-
-
50
0
0
-
-
-
Max
1.4
3.4
4.0
2.0
4.0
4.5
5.5
12.8
13.0
-
-
-
375
130
115
Min
-
-
-
-
-
-
-
-
-
66
0
0
-
-
-
Max
1.05
2.6
3.0
1.52
3.0
3.5
4.2
9.7
9.1
-
-
-
495
172
152
Unit
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
ns
ns
ns
ns
ns
ns
Condition
Switching Characteristics
(See Fig. 3)
RC Oscillator Frequency
External Clock or
Crystal Oscillator
Frequency
f
osc
f
ext
f
ext
t
1
t
2
t
3
t
4
+V
-
For prescale
factor S = 1 or 3,000
or 3,600
S = 32,768
or
32,768 x 60
-
-
-
C
L
= 50pF
-
TRIG Set-Up Time
A, B Set-Up Time
WB0 - WB7 Set-Up Time
Clock to Out Delay
39
0
0
-
-
-
500k
A 1
+V
MODE
REG
500k
B 2
EDGE
DETECT
LATCH
500k
TRIG 18
CONTROL
LOGIC
BUF
9
OUT
RESET 7
500k
CLOCK/RC/XTLI
4
CLOCK
LATCH/TIMER
8
500k
10-17
(8)
WB7-WB0
OSC
MUX
PRESCALER
XTLO
(LS7212N)
5
RCS/CLKS (LS7211N)
5
500k
+V
+V
3
8
V
DD
V
SS
1M
PSCLS 6
1M
-V
(Gnd)
3-STATE
DECODER
FIGURE 2. LS7211N / LS7212N BLOCK DIAGRAM
7211N-072009-4
LSI [ LSI COMPUTER SYSTEMS ]
