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LS7031 Scheda tecnica(PDF) 2 Page - LSI Computer Systems

Il numero della parte LS7031
Spiegazioni elettronici  6 DECADE MOS UP COUNTER WITH 8 DECADE LATCH AND MULTIPLEXER
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Produttore elettronici  LSI [LSI Computer Systems]
Homepage  http://www.lsicsi.com
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POWER SUPPLIES
+4.75V to +15V single power supply operation is obtained when
VGG and VDD are tied together. Inputs and outputs are CMOS
compatible and Minimum Input Noise Immunity of 25% of power
supply is guaranteed except for Decade 1 and 2 inputs.
(All inputs are TTL compatible at +4.75V to +5.25V operation.)
With VGG at -12V, VDD at OV and Vss at +5V all inputs are TTL
and CMOS compatible. All outputs are CMOS compatible and
BCD and BLANK outputs also provide standard TTL compat-
ibility. In addition, Overflow Output is low power TTL compatible.
In either mode outputs swing between VDD and Vss.
MAXIMUM RATINGS
PARAMETER
SYMBOL
VALUE
UNITS
Storage Temperature
Tstg
-65 to +150
°C
Operating Temperature TA
-25 to +70
°C
Voltage (any pin to Vss) Vmax
-30 to +0.5
V
PARAMETER
SYMBOL
MIN
MAX
UNITS
Operating Supply Current
Idds
-
15
mA
(fC = 7.5MHz)
Input Noise Immunity
Low and High
Vni
25%
-
V
(Vss-VDD)
Input Voltage “0"
Vil
Vss - 20
Vss - 3.95
V
Input Voltage “1"
Vih
Vss - 1.0
Vss
V
Output Voltage “0"
Vol
-
+0.2
V
Output Voltage “1"
Voh
Vss - 1.0
-
V
Output Voltage “0"
(sinking 10µA)
Vol
-
+0.5
V
Output Current “1"
Vss = 4.75V(Voh = Vss - 0.5V)
-
0.05
-
mA
(Voh = Vss - 1V)
-
0.25
-
mA
(Voh = Vss - 4V)
-
0.90
-
mA
Vss = 10V (Voh = Vss - 2V)
-
2.0
-
mA
(Voh = Vss - 3V)
-
3.0
-
mA
Vss = 15V (Voh = Vss - 2V)
-
3.0
-
mA
(Voh = Vss - 3V)
-
4.5
-
mA
NOTE 1: Current Sink = Same as segment and strobe outputs.
Current Source = N/A at Voh = Vss - 0.5V for Vss = +4.75V
35µA at Voh = Vss -1V for Vss = +4.75V
40% of segment and strobe outputs at all other specified operating points.
NOTE 2: Limit segment current to 6mA maximum.
The following inputs have internal pull down resistors to VDD with maximum sink current of 5µA at Vss input.
Scan Reset
B1/D1
B1/D2
Decimal
B2/D1
B2/D2
Overflow
B4/D1
B4/D2
B8/D1
B8/D2
DC ELECTRICAL CHARACTERISTICS
(VDD = VGG= OV, Vss = +4.75 to +15V, -25°C
≤ TA ≤ +70°C unless otherwise specified.)
D6, D7, D8
OF, BCD
Blank
(See Note 1)
Segment
and
Strobe
Outputs
(See Note 2)
BLANKING
Leading zero blanking is employed. At start of each MSD to LSD
scan, display is blanked until a non-zero digit or active decimal
point is encountered. Display unblanks during LSD time and when-
ever Overflow output is high. When Scan Reset is applied, display
blanks to prevent display damage.
Blanking information is available at Blank output.
BCD DATA
Data is available in multiplexed BCD format. BCD data can be
readily demultiplexed using Digit Strobes as latch enable signals.
{
7031-110201-2
TTL COMPATIBLE OUTPUTS:
POWER SUPPLIES: Vss = +5V ± 5%, VDD = 0V, VGG = -12V ± 5%
OUTPUT LEVELS: “1" Level
≥ Vss - 0.5V (sourcing 100µA)
“0" Level
≤ 0.4V (sinking 1.6mA)
“1" Level
≥ Vss -.5V (sourcing 40µA)
“0" Level
≤ 0.4V (sinking .18mA)
All other outputs as specified for single power supply, Vss = +15V operation.
Inputs as specified for single power supply, Vss = +5V ± 5% operation.
}
}
BLANK AND BCD
DATA OUTPUTS
OVERFLOW
OUTPUT
{
EXTERNAL
DECADE
INPUTS
SCAN OSCILLATOR CAPACITANCE
TYPICAL OSCILLATOR FREQUENCY
4.75V
10V
15V
50pF
40.0 kHz
24.2kHz
22.2 kHz
100pF
22.2 kHz
14.8kHz
13.8 kHz
470pF
5.0 kHz
3.6kHz
3.5 kHz


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