MIC50395CN Micrel Semiconductor, MIC50395CN Datasheet

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MIC50395CN

Manufacturer Part Number
MIC50395CN
Description
Six Decade Counter / Display Decoder
Manufacturer
Micrel Semiconductor
Datasheet

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Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
MIC50395CN
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IDEC
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Pin Connection
MIC50395/50396/50397
General Description
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.
SEGMENTS
COUNTER
BCD
BCD
OUT
IN
STORE
CLEAR
V SS
SET
LZB
C D
C C
C B
C A
C
D
A
B
a
b
d
e
g
c
f
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
MIC50395CN
MIC50396CN
MIC50397CN
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
D 6
D 5
D 4
D 3
D 2
D 1
UP/DOWN
ZERO
CARRY
COUNT INHIBIT
COUNT
R A
R B
R C
R D
LOAD COUNTER
LOAD REGISTER
EQUAL
V DD
SCAN
8-4
MSD
DIGIT
STROBES
LSD
REGISTER
Ordering Information
Features
• 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:
• MIC50397 programmed to count time:
BCD
Part Number
MIC50395CN
MIC50396CN
MIC50397CN
IN
– 99 hrs. 59 min. 59 sec.
– 59 hrs. 59 min. 99/100 min.
Six Decade Counter / Display Decoder
Not Recommended for New Designs
MIC50395/50396/50397
Segment Identification
Temp. Range
0 C to 70 C
0 C to 70 C
0 C to 70 C
e
f
a
g
d
b
c
40-pin Plastic DIP
40-pin Plastic DIP
40-pin Plastic DIP
Package
August 1998
Micrel

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MIC50395CN Summary of contents

Page 1

... MIC50397 programmed to count time: – 59 hrs. 59 min. 99/100 min. Ordering Information Part Number MIC50395CN MIC50396CN MIC50397CN 40 UP/DOWN 39 ZERO 38 CARRY 37 COUNT INHIBIT 36 COUNT REGISTER BCD MIC50395CN 32 MIC50396CN 31 LOAD COUNTER MIC50397CN 30 LOAD REGISTER MSD DIGIT STROBES LSD 23 EQUAL ...

Page 2

MIC50395/50396/50397 Operations: Six Decade Counter, Latch The six decade counter is synchronously incremented or decremented on the positive edge of the count input signal. A Schmitt trigger on this input provides hysteresis for protec- tion against both a noisy environment ...

Page 3

MIC50395/50396/50397 If external capacitors on the BCD inputs are undesirable, it will be necessary to synchronize the negative going edge of the load register and/or load counter command to coincide with the positive going edge of the scan input signal. ...

Page 4

MIC50395/50396/50397 Absolute Maximum Ratings Voltage on Any Terminal Relative to V Operating Temperature Range (Ambient) Storage Temperature Range (Ambient) Maximum Operating Conditions Symbol Parameter T Operating Temperature A V Supply voltage ( Supply Current SS B Break Down ...

Page 5

MIC50395/50396/50397 Timing 1 2 COUNT UP/DOWN COUNT INHIBIT STORE t PCW CLEAR t CS COUNT t OA ZERO t CA CARRY t EA EQUAL SCAN LOAD COUNTER LOAD REGISTER Loading Counter, Register (1 Digit) LOAD COUNTER OR REGISTER BCD DATA ...

Page 6

MIC50395/50396/50397 Dynamic Operating Conditions Symbol Parameter f Count Input Frequency CI f Scan Input Frequency SI t Count Pulse Width CPW t Store Pulse Width SPW t Store Setup Time SS t Count Inhibit Setup Time CIS t Up/Down Setup ...

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