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
PARAMETER
Storage Temperature
Operating Temperature
Voltage (any pin to Vss)
SYMBOL
Tstg
T
A
Vmax
VALUE
-65 to +150
-25 to +70
-30 to +0.5
POWER SUPPLIES
+4.75V to +15V single power supply operation is obtained when
V
GG
and V
DD
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 V
GG
at -12V, V
DD
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 V
DD
and Vss.
UNITS
°C
°C
V
DC ELECTRICAL CHARACTERISTICS
(V
DD
= V
GG
= OV, Vss = +4.75 to +15V, -25°C
≤
T
A
≤
+70°C unless otherwise specified.)
PARAMETER
SYMBOL
MIN
Operating Supply Current
Idds
-
(f
C
= 7.5MHz)
Input Noise Immunity
Low and High
Vni
25%
(Vss-V
DD
)
EXTERNAL
Input Voltage “0"
Vil
Vss - 20
DECADE
Input Voltage “1"
Vih
Vss - 1.0
INPUTS
MAX
15
UNITS
mA
-
Vss - 3.95
Vss
+0.2
-
V
V
V
V
V
{
D6, D7, D8
OF, BCD
Blank
(See
Note 1)
{
Output Voltage “0"
Output Voltage “1"
Output Voltage “0"
(sinking 10µA)
Output Current “1"
Vol
Voh
-
Vss - 1.0
Vol
-
+0.5
V
Segment
and
Strobe
Outputs
(See
Note 2)
Vss = 4.75V(Voh = Vss - 0.5V)
(Voh = Vss - 1V)
(Voh = Vss - 4V)
Vss = 10V (Voh = Vss - 2V)
(Voh = Vss - 3V)
Vss = 15V (Voh = Vss - 2V)
(Voh = Vss - 3V)
-
-
-
-
-
-
-
0.05
0.25
0.90
2.0
3.0
3.0
4.5
-
-
-
-
-
-
-
mA
mA
mA
mA
mA
mA
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 V
DD
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%, V
DD
= 0V, V
GG
= -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)
SCAN OSCILLATOR CAPACITANCE
TYPICAL OSCILLATOR FREQUENCY
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
}
}
BLANK AND BCD
DATA OUTPUTS
OVERFLOW
OUTPUT
50pF
100pF
470pF
All other outputs as specified for single power supply, Vss = +15V operation.
Inputs as specified for single power supply, Vss = +5V ± 5% operation.
7031-110201-2
LSI [ LSI COMPUTER SYSTEMS ]
