LS7212 LSI Computer Systems, LS7212 Datasheet - Page 4

• Manufacturer Part Number: LS7212
• Description: PROGRAMMABLE DIGITAL DELAY TIMER
• Manufacturer: LSI Computer Systems

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
RCS/CLKS(LS7211)
CLOCK/RC/XTLI 4
XTLO(LS7212)
PSCLS
RESET
TRIG 18
A
B
2
1
7
6
500K
5
5
SYMBOL
+V
+
V
500K
500K
500K
f
f
f
FIGURE 2. LS7211/LS7212 BLOCK DIAGRAM
osc
ext
ext
t
t
t
t
1
2
3
4
OSC
+V
1M
1M
10.0
18.0
10.0
18.0
10.0
18.0
10.0
18.0
V
4.0
4.0
4.0
4.0
DD
-
-
-
500K
LATCH
Min
215
23
80
50
0
0
-
-
-
-
-
-
-
-
-
MUX
MODE
REG
CLOCK
3-STATE
DECODER
Max
11.0
1.3
4.0
6.0
2.3
7.0
1.2
4.0
7.0
-
-
-
-
-
-
EDGE
DETECT
Min
280
105
30
65
0
0
-
-
-
-
-
-
-
-
-
Max
0.93
1.0
3.0
4.5
1.8
5.5
8.5
3.0
5.5
-
-
-
-
-
-
LATCH/TIMER
PRESCALER
CONTROL
LOGIC
Min
370
140
40
85
0
0
-
-
-
-
-
-
-
-
-
-V (Gnd)
Max
0.76
2.3
3.4
1.3
4.0
6.5
0.7
2.3
4.2
-
-
-
-
-
-
+V
8
BUF
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
Unit
ns
ns
ns
ns
ns
ns
500K (8)
Condition
-
For prescale
factor S = 1 or 3000
or 3600
S = 32768
32768 X 60
-
-
-
C
or
L
10-17
3
8
= 50pF
V
V
DD
SS
9
WB7-WB0
OUT