LS7211_03 Datasheet, PDF (4/8 Pages) LSI Computer Systems – PROGRAMMABLE DIGITAL DELAY TIMER

ELECTRICAL CHARACTERISTICS (Voltages referenced to Vss) (Con’t)
Characteristic
SYMBOL VDD
Unit Condition
Min Max Min Max Min Max
Switching Characteristics (See Fig. 3)
4.0
-
1.3
-
1.0
-
0.76 MHz
RC Oscillator Frequency
fosc 10.0
-
4.0
-
3.0
-
2.3 MHz -
18.0
-
6.0
-
4.5
-
3.4 MHz
4.0
-
2.3
-
1.8
-
1.3 MHz For prescale
External Clock or
fext 10.0
-
7.0
-
5.5
-
4.0 MHz factor S = 1 or 3000
Crystal Oscillator
18.0 -
11.0
-
8.5
-
6.5 MHz or 3600
Frequency
4.0
-
1.2
-
0.93
-
0.7 MHz S = 32768
fext 10.0
-
4.0
-
3.0
-
2.3 MHz or
18.0
-
7.0
-
5.5
-
4.2 MHz 32768 x 60
TRIG Set-Up Time
A, B Set-Up Time
WB0 - WB7 Set-Up Time
Clock to Out Delay
A1
B2
TRIG 18
RESET 7
CLOCK/RC/XTLI 4
XTLO(LS7212) 5
t1
-
23
-
30
-
40
-
ns -
t2
-
0
-
0
-
0
-
ns -
t3
-
0
-
0
-
0
-
ns -
4.0 215
-
280
-
370
-
ns
t4
10.0
80
-
105
-
140
-
ns CL = 50pF
18.0 50
-
65
-
85
-
ns
d _+V
e _500K
u ₊
V
tin ^500K
con ^500K
MODE
REG
LATCH
EDGE
DETECT
500K
CLOCK
Dis ^OSC
MUX
CONTROL
LOGIC
BUF
9 OUT
LATCH/TIMER
8
10-17 WB7-WB0
500K (8)
PRESCALER
RCS/CLKS(LS7211) 5
500K
PSCLS 6
+V
1M
1M
3-STATE
DECODER
+V
-V (Gnd)
3 VDD
8 VSS
FIGURE 2. LS7211/LS7212 BLOCK DIAGRAM
7211-012703-4