DEVICE CONNECTIONS *
COUNT (C) - CMOS Schmidt Trigger input, counter increments on falling edge
of count pulse.
TEST (T) - CMOS level-sensitive. When the input is “HIGH” , the counter
operates normally. When pulled “LOW” , the carry input to each decade is
disconnected and tied to the count input so that all decades count in parallel to
provide rapid testing.
INHIBIT (I) - CMOS level-sensitive, a “LOW” level will prevent the counter
from accepting pulses at the “COUNT” input. A “HIGH” level will enable
the counter.
RESET (R) - CMOS level-sensitive, a “LOW” level will reset the counter to 0
(or to 00000000 if LZB is disabled) . A “HIGH” level will allow the counter
to operate normally.
LATCH (L) - CMOS level-sensitive, a “HIGH” level will latch the data in the
display drivers while the counter registers can continue to update. A “LOW”
level will allow the display driver to update with the counter registers.
V SS - Common for D.C. Supply and Inputs.
LEADING ZERO BLANKING (LZB) - CMOS level-sensitive, a “LOW”
level will enable leading zero blanking. A “HIGH” level will display leading
zeros. LZB can only be changed at power up.
V DD - Positive side of D.C. Supply.
* All unused inputs must be tied to either V DD or V SS , whichever is appropriate.
CAUTION
The SUB-CUB2-8A contains CMOS circuitry and has the same
protection circuits as standard CMOS devices, to prevent damage to inputs
due to nominal over-voltage. This device requires special anti-static
BLOCK DIAGRAM
MAXIMUM RATINGS (VOLTAGE REF. TO V SS )
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 the units handled only on a
conductive table top by personnel wearing wrist strap grounding
equipment.
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)
-20 to +85
-20 to +85
UNIT
VDC
VDC
° C
° C
ELECTRICAL CHARACTERISTICS V DD = 5 V ±10% @ 25 o C UNLESS OTHERWISE SPECIFIED
SYMBOL
V DD
I DD
I DDQ
V IH
V IL
V IH
V IL
I IL
F C
T R
T L
PARAMETER
Supply Voltage
Supply Current
Quiescent Current
Input Voltage - High
Input Voltage - Low
Input Voltage - High
Input Voltage - Low
Input Leakage Current
Count Frequency
(50% Duty Cycle)
Reset Pulse Width
Latch Pulse Width
MIN.
4.5
3.5
3.0
750
10
10
TYP.
5V
50
40
2.9
1.3
1.9
1.9
0.1
1000
0.5
0.5
MAX.
5.5
100
100
1.0
1.0
1.0
UNIT
VDC
μA
μA
VDC
VDC
VDC
VDC
μA
KHz
μS
μS
TEST CONDITION
F C =10 KHz
Not Counting
Count, Reset & Latch Input Only
Count, Reset & Latch Input Only
Test, Inhibit, & LZB Input Only
Test, Inhibit, & LZB Input Only
50% Duty Cycle
ORDERING INFORMATION
MODEL NO.
SCUB28A
HWK 28
HWK 3
DESCRIPTION
SUB-CUB2-8A Display/Counter Module
* Panel Bezel Kit with P.C. Board & Cable
* Panel Bezel Kit w/o P.C. Board & Cable
PART NUMBER
SCUB28A0
HWK28000
HWK30000
* - Does not include SUB-CUB2-8A Display/Counter Module (Order SUB-CUB2-8A Separately).
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