LS7212N LSI [LSI Computer Systems], LS7212N Datasheet - Page 4

• Manufacturer Part Number: LS7212N
• Description: PROGRAMMABLE DIGITAL DELAY TIMER
• Manufacturer: LSI [LSI Computer Systems]

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