MIC50395 Datasheet, PDF (1/6 Pages) Micrel Semiconductor – Six Decade Counter / Display Decoder Not Recommended for New Designs

MIC50395/50396/50397
Micrel
MIC50395/50396/50397
Six Decade Counter / Display Decoder
Not Recommended for New Designs
General Description
Features
The MIC50395 is an ion-implanted, P-channel MOS six-
decade synchronous up/down-counter/display driver with
compare-register and storage-latches. The counter as well
as the register can be loaded digit-by-digit with BCD data.
The counter has an asynchronous-clear function.
Scanning is controlled by the scan oscillator input which is
self-oscillating or can be driven by an external signal. The
six-decade register is constantly compared to the state of
the six-decade counter and when both the register and the
counter have the same content, an EQUAL signal is gener-
ated. The contents of the counter can be transferred into the
6-digit latch which is then multiplexed from MSD to LSD in
BCD and 7-segment format to the output. The seven-
segment decoder incorporates a leading-zero blanking
circuit which can be disabled by an external signal. This
device is intended to interface directly with the standard
CMOS logic families.
The MIC50396 and MIC50397 operate identically to the
MIC50395 except that two digits in each were reprogrammed
to provide divide by six circuitry instead of divide by ten. The
MIC50396 is well suited for industrial timer applications while
the MIC50397 is best suited for stop watch or real time
computer clock applications.
• Single power supply
• Schmitt-Trigger on the count-input
• Drives common anode or cathode displays (CA with buffer)
• Six decades of synchronous up/down counting
• Look-ahead carry or borrow
• Loadable counter
• Loadable compare-register with comparator output
• Multiplexed BCD and seven-segment outputs
• Internal scan oscillator
• Direct LED segment drive
• Interfaces directly with CMOS logic
• Leading zero blanking
• MIC50396 programmed to count time:
– 99 hrs. 59 min. 59 sec.
• MIC50397 programmed to count time:
– 59 hrs. 59 min. 99/100 min.
Ordering Information
Part Number Temp. Range
MIC50395CN
MIC50396CN
MIC50397CN
0°C to 70°C
0°C to 70°C
0°C to 70°C
Package
40-pin Plastic DIP
40-pin Plastic DIP
40-pin Plastic DIP
Pin Connection
V _SS 1
SET 2
LZB 3
a4
b5
SEGMENTS
c6
d7
e8
f9
g 10
A 11
BCD
OUT
B 12
C 13
D 14
STORE 15
C _D 16
COUNTER ^{C C 17}
BCD
IN
C _B 18
C _A 19
CLEAR 20
MIC50395CN
MIC50396CN
MIC50397CN
40 UP/DOWN
39 ZERO
38 CARRY
37 COUNT INHIBIT
36 COUNT
35 R _A
34 R _B
33 R _C
REGISTER
BCD
IN
32 R _D
31 LOAD COUNTER
30 LOAD REGISTER
29 D ₆ MSD
28 D ₅
27 D ₄ DIGIT
26 D ₃ STROBES
25 D ₂
24 D ₁ LSD
23 EQUAL
22 V _DD
21 SCAN
Segment Identification
a
f _gb
e
c
d
8-4
August 1998