LS7030_03 Datasheet, PDF (2/4 Pages) LSI Computer Systems – 8 DECADE MULTIPLEXED COUNTER

BCD and 7 SEGMENT DATA
Data is available in BCD and 7 segment format. BCD data can be
demultiplexed using Digit Strobes as latch enable signals.
POWER SUPPLIES
+4.75 Volts to +15 Volts 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 Test Count Input. (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
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
Operating Supply Current
(fC = 7.5MHz)
Input Noise Immunity
Low and High
Test Count Input
D6, D7, D8
OF, BCD
Blank
(See Note 1)
Segment
and
Strobe
Outputs
(See Note 2)
{ Output Voltage “0"
Output Voltage “1"
Output Voltage “0"
(sinking 10µA)
Output Voltage “1"
Vss = 4.75 (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)
SYMBOL
Idds
Vni
Vil
Vih
Vol
Voh
Vol
-
-
-
-
-
-
-
MIN
-
25%
(Vss - VDD)
Vss - 20
Vss - 1.0
-
Vss - 1.0
-
0.05
0.25
0.90
2.0
3.0
3.0
4.5
MAX
15
-
Vss - 3.95
Vss
+0.2
-
+0.5
-
-
-
-
-
-
-
UNITS
mA
V
V
V
V
V
V
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 4.5mA maximum.
Limit strobe 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
Test Count
Count
Decimal Point Overflow
Lamp Test
SCAN OSCILLATOR
CAPACITANCE
50pF
100pF
470pF
750pF
2000pF
7030-012703-2
TYPICAL OSCILLATOR FREQUENCY
4.75V
10V
15V
40.0 kHz
24.2kHz
22.2 kHz
22.2 kHz
14.8kHz
13.8 kHz
5.0 kHz
3.6kHz
3.5 kHz
3.3 kHz
2.4kHz
2.2 kHz
1.3 kHz
0.91kHz
0.85 kHz