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BLOCK DIAGRAM
DEVICE CONNECTIONS *
COUNT (A) - CMOS, Schmidt Trigger; used as count or
count control input, depending on the mode of operation
selected. It’s generally used as a count input. See Modes
of Operation for more details.
COUNT (B) - CMOS, Schmidt Trigger; used as count or
count control input, depending on the mode of operation
selected. It’s generally used as a count control input. See
Modes of Operation for more details.
RESET (R) - CMOS, Schmidt Trigger; counter is reset and
held to zero when this pin is at a low level.
Note: Counter should always be RESET to zero whenever
power is first applied to the unit.
INHIBIT (I) - CMOS, Schmidt Trigger; all counting for all
modes is inhibited when this input is at a low level. This
input is asynchronous with inputs “A” and “B”.
LATCH (L) - CMOS, Schmidt Trigger; data on the display
is latched when this input is at a high level. This input has
no effect on the counting operations of the unit and is
asynchronous with inputs “A” and “B”.
LZB1, LZB2, LZB3 - CMOS, level sensitive; these inputs
are used for leading zero blanking selection. See Decimal
Point and Leading Zero Blanking Selection for more
details.
MS1, MS2, MS3, MS4 - CMOS, level sensitive; these inputs
are used for Mode Selection. These modes are: Bi-
Directional Counting and Quadrature Counting. See
Modes of Operation for more details.
DP1, DP2, DP3 - LCD inputs which must be connected to
either BP or BP to Turn Decimal Points “OFF” or “ON”.
See Decimal Point and Leading Zero Blanking Selection
for more details.
BP, BP - CMOS outputs for LCD. Used to turn decimal
points “OFF” or “ON”. See Decimal Point and Leading
Zero Blanking Selection for more details.
V DD - 2.5 to 6VDC Supply.
V SS - Common for DC Supply and Inputs.
* All unused inputs must be tied to V SS or V DD , whichever is
appropriate.
CAUTION
This device contains CMOS circuitry which requires special anti-static
MAXIMUM RATINGS (VOLTAGE REF. TO V SS )
C
C
handling to the same degree required by standard CMOS integrated circuits.
Units should be stored in the conductive packaging used to ship the devices.
Containers should be opened and units handled only on a conductive table
top by personnel wearing wrist-strap grounding equipment. These devices
have the same protection circuits as standard CMOS devices to prevent
damage to inputs due to nominal over-voltage.
RATING
DC Supply Voltage
Input Voltage, All Inputs
Operating Temperature
Storage Temperature
SYMBOL
V DD
V I
T A
T STG
VALUE
-0.5 to +6.5
-0.5 to (V DD +0.5)
-35 to +85
-35 to +85
UNIT
VDC
VDC
o
o
ELECTRICAL CHARACTERISTICS V DD = 5 V ±10% UNLESS OTHERWISE SPECIFIED
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
TEST CONDITION
V DD
I DD
I DDQ
V IH
V IL
I IL
Supply Voltage
Supply Current
Quiescent Current
Input High Voltage
Input Low Voltage
Input Leakage Current
2.5
3.9
500
15
6
3.0
0.9
0.01
6.0
22
12
0.5
0.1
VDC
μA
μA
VDC
VDC
μA
KHz
All Modes
fc = 10 KHz
Not Counting
V SS < V IN < V DD
X1,
÷ 10 & 100 Bi-directional Modes
fc
T RST
Count Frequency
(50% Duty Cycle)
Reset Pulse Width
250
200
100
10
KHz
KHz
KHz
μS
X2,
X1,
X4,
÷ 5 & 50 Bi-directional Modes
X2, ÷ 10, 100, 5, & 50 Quadrature Mode
÷ 2.5 & 25 Quadrature Mode
2
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