LS7031(2003) Ver la hoja de datos (PDF) - LSI Corporation
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LS7031 Datasheet PDF : 4 Pages
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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.
MAXIMUM RATINGS
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.
PARAMETER
SYMBOL
Storage Temperature Tstg
Operating Temperature TA
Voltage (any pin to Vss) Vmax
VALUE
-65 to +150
-25 to +70
-30 to +0.5
UNITS
°C
°C
V
DC ELECTRICAL CHARACTERISTICS
(VDD = VGG = OV, Vss = +4.75 to +15V, -25°C ≤ TA ≤ +70°C unless otherwise specified.)
PARAMETER
SYMBOL
MIN
Operating Supply Current
Idds
-
(fC = 7.5MHz)
Input Noise Immunity
Low and High
Vni
25%
EXTERNAL
DECADE
INPUTS
{ Input Voltage “0"
Input Voltage “1"
(Vss - VDD)
Vil
Vss - 20
Vih
Vss - 1.0
D6, D7, D8
OF, BCD
Blank
(See Note 1)
{ Output Voltage “0"
Output Voltage “1"
Output Voltage “0"
(sinking 10µA)
Vol
-
Voh
Vss - 1.0
Vol
-
MAX
15
-
Vss - 3.95
Vss
+0.2
-
+0.5
UNITS
mA
V
V
V
V
V
V
Segment
Output Current “1"
and
Vss = 4.75V(Voh = Vss - 0.5V)
-
0.05
-
mA
Strobe
(Voh = Vss - 1V)
-
0.25
-
mA
Outputs
(Voh = Vss - 4V)
-
0.90
-
mA
(See Note 2)
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
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)
BLANK AND BCD
DATA OUTPUTS
“1" Level ≥ Vss -.5V (sourcing 40µA)
“0" Level ≤ 0.4V (sinking 0.18mA)
} OVERFLOW
OUTPUT
SCAN OSCILLATOR CAPACITANCE
TYPICAL OSCILLATOR FREQUENCY
50pF
100pF
470pF
4.75V
40.0 kHz
22.2 kHz
5.0 kHz
10V
24.2kHz
14.8kHz
3.6kHz
15V
22.2 kHz
13.8 kHz
3.5 kHz
All other outputs as specified for single power supply, Vss = +15V operation.
Inputs as specified for single power supply, Vss = +5V ± 5% operation.
7031-012703-2
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