PIN DESCRIPTIONS
(All inputs are Schmidt trigger inputs)
V
DD
: +5 VDC power
V
SS
: GND or common supply terminal
DP1 & DP2
: Counters - See Decimal Point Configuration Chart
Timers - Tie low
MS1-MS4
: See Mode Select Inputs Chart
RST
: Active low, will reset the display to zero
LATCH
: Counters - A HIGH level will freeze the display, a LOW level will
allow the counter to update the display normally
Timers - Tie low
CNT
: Counters - This is the count input (edge trigger determined by mode)
Timers - This is the run input (active low = timer runs)
DECIMAL POINT CONFIGURATION CHART
DP2
DP1
DISPLAY
0
0
0
0
1
0.0
1
0
0.00
1
1
0.000
MODE SELECT INPUTS CHART
MODE
MS4
MS3
MS2
MS1
MODE OF OPERATION
0
0
0
0
0
0.001 Second Timer
1
0
0
0
1
0.01 Second Timer
2
0
0
1
0
0.1 Second Timer
3
0
0
1
1
1 Second Timer
4
0
1
0
0
0.1 Minute Timer
5
0
1
0
1
1 Minute Timer
6
0
1
1
0
0.01 Hour Timer
7
0
1
1
1
0.1 Hour Timer
8
1
0
0
0
1 Hour Timer
9
1
0
0
1
DO NOT USE
10
1
0
1
0
Negative Edge Counter
11
1
0
1
1
Positive Edge Counter
12
1
1
0
0
DO NOT USE
13
1
1
0
1
DO NOT USE
14
1
1
1
0
DO NOT USE
15
1
1
1
1
DO NOT USE
3
TYPICAL APPLICATIONS
V
SS
(GND)
CNT
NO CONNECTION
NO CONNECTION
NO CONNECTION
LATCH
RST
MS1
MS2
MS3
MS4
NO CONNECTION
DP2
DP1
V
DD
RST
.0022 µf
220K
GND
+5 V
TTL SIGNAL
GND
+5 V
.0022 µf
220K
220K
TIMER
RUN
V
SS
(GND)
CNT
NO CONNECTION
NO CONNECTION
NO CONNECTION
LATCH
RST
MS1
MS2
MS3
MS4
DP2
DP1
V
DD
RST
1 MINUTE TIMER
- With Leading Zero Blanking
enabled. Time starts with the switch closed. Time
stops and holds the display with the switch open.
COUNTER
- TTL signal input counting. Positive edge
incrementing (leading edge).
ORDERING INFORMATION
MODEL NO
DESCRIPTION
PART NUMBER
MDMU
Panel Mount W/Reflective Display
MDMU0000
Panel Mount W/Yel-Grn Backlighting
MDMU0010
Panel Mount W/Red Backlighting
MDMU0020
PC Board Mount W/Reflective Display
MDMU0100
PC Board Mount W/Yel-Grn Backlighting
MDMU0110
PC Board Mount W/Red Backlighting
MDMU0120
HWK7
MDM Cable Assembly
HWK70000
ACCESSORY: MDM CABLE ASSEMBLY - HWK70000
0.15 (3.8)
12 (305)
CIRCUIT #1; BROWN
0.100 (2.54), TYP.
STRIPPED AND TINNED
COLOR CODED RIBBON CABLE
0.100 (2.54), TYP.
