数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

LS7031 数据表(PDF) 1 Page - LSI Computer Systems

部件名 LS7031
功能描述  6 DECADE MOS UP COUNTER WITH 8 DECADE LATCH AND MULTIPLEXER
Download  4 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  LSI [LSI Computer Systems]
网页  http://www.lsicsi.com
标志 LSI - LSI Computer Systems

LS7031 数据表(HTML) 1 Page - LSI Computer Systems

  LS7031_03 Datasheet HTML 1Page - LSI Computer Systems LS7031_03 Datasheet HTML 2Page - LSI Computer Systems LS7031_03 Datasheet HTML 3Page - LSI Computer Systems LS7031_03 Datasheet HTML 4Page - LSI Computer Systems  
Zoom Inzoom in Zoom Outzoom out
 1 / 4 page
background image
6 DECADE MOS UP COUNTER WITH 8 DECADE LATCH AND MULTIPLEXER
FEATURES:
• DC to 7.5 MHz Count Frequency
• Multiplexed BCD Outputs
• DC to 500kHz Scan Frequency
• +4.75V to +15V Operation (VDD - VSS)
• Compatible with CMOS Logic
• High Input Noise Immunity
• Ability to Latch External BCD Data in the two LSD Positions
• Leading Zero Blanking with Decimal Point and Overflow Controls
• All inputs protected
• Low Power Dissipation
• 40 Pin DIP - See Figure 1
DESCRIPTION: (See Block Diagram, Figure 4.)
The LS7031 is a MOS, 6 decade up counter. The circuit includes
latches, a multiplexer, leading zero blanking and BCD data outputs.
CLOCK GENERATOR
The clock for the six decade counter (digit positions 3-8) is formed
from the internal ‘OR’ combination of B4/D2 and B8/D2 if LS7031
is used with external prescaling counters. When operated in this
fashion the maximum allowable propagaton delay between B4/D2
(H-L) and B8/D2 (L-H), measured at Vss - 1V, is 10ns. If used as
a straight six decade counter, clock pulses may be applied to
inputs B4/D2 or B8/D2 with the unused input held low. In either
mode of operation total pulse width must be minimum 62ns.
6 DECADE UP COUNTER
The six decade ripple through counter increments on the negative
edge of the input count pulse. Maximum ripple time is 12µs
(999999 to 000000). Maximum count frequency is 7.5MHz.
RESET
All 6 counter decades are reset to zero when Reset input is brought
low for a minimum of 4µs. The Overflow flip-flop is reset at the
same time. Reset must be high for a minimum of 1µs before next
valid count can be recorded.
SCAN OSCILLATOR AND COUNTER
The scan counter is driven by an internal oscillator whose
frequency is determined by a capacitor connected between
Oscillator input and Scan input. An external scan clock applied
to Scan input can also drive the scan counter. Scan counter
advances on negative edge of scan clock.
The counter scans from MSD to LSD. When Scan Reset input is
brought high the scan counter is forced to MSD state. Internal
synchonization guarantees proper scanning no matter when Scan
Reset is brought low relative to scan clock. Maximum scan
frequency is 500kHz.
DECIMAL POINT
A high at the Decimal Point input resets the Blanking flip-flop
causing the display to unblank. Decimal Point should be brought
high at start of digit time which has active Decimal Point.
January 2003
7031-012703-1
LSI/CSI
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405
LS7031
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
FIGURE 1
CONNECTION DIAGRAM - TOP VIEW
OSC. INPUT
SCAN INPUT
N.C.
B1/D1
B2/D1
N.C.
B4/D1
B8/D1
N.C.
B1/D2
B2/D2
B4/D2
V SS
V GG
N.C.
N.C.
V DD
RESET COUNTER INPUT
LOAD LATCH INPUT
SCAN RESET INPUT
MSD STROBE 8
STROBE 7
STROBE 6
STROBE 5
STROBE 4
STROBE 3
STROBE 2
LSD STROBE 1
DECIMAL POINT INPUT
BLANK OUTPUT
OVERFLOW OUTPUT
OVERFLOW INPUT
DECADE 8 OUTPUT,
D8
DECADE 7 OUTPUT,
D7
DECADE 6 OUTPUT,
D6
B8
B4
B2
B1
BCD
DATA
OUTPUTS
DIGIT
STROBE
OUTPUTS
LS7031
INPUT TO
DECADE 1
LATCH
INPUT TO
DECADE 2
LATCH
B8/D2
DIGIT STROBES
Timing of Digit Strobes is arranged such that both edges of strobe
are guardbanded by a minimum 400ns within valid BCD data when
scan frequency is 100kHz or less. The guardband is a minimum of
200ns at 250kHz scan frequency. At 500kHz only negative edge of
Strobe is guaranteed to be within valid BCD data by a minimum
200ns.
OVERFLOW
The Overflow flip-flop sets on the first negative transition of the Over-
flow Input and remains set until Reset is brought low. Data is trans-
ferred from Overflow flip-flop to Overflow Latch when Load is brought
low. A high at the Overflow Latch causes display to unblank. Over-
flow Output is output of Overflow Latch. MSB outputs of Decades
6, 7, 8 are available for use as Overflow Input.
LATCHES
Eight decades of latch are provided, two for storage of the two
external least significant decade counters and the remaining 6 for in-
ternal counter outputs. All latches when Load signal is brought low
for a minimum of 4µs and kept low until a minimum of 12µs has
elapsed from previous negative edge of count pulse (ripple time).
Storage of valid data occurs when Load signal is high for a minimum
of 1µs before next negative edge of count pulse or reset. Data is
transferred from Overflow flip-flop to Overflow latch at the same time.
UL
®
A3800


类似零件编号 - LS7031_03

制造商部件名数据表功能描述
logo
LSI Computer Systems
LS7031 LSI-LS7031 Datasheet
47Kb / 4P
   6 DECADE MOS UP COUNTER WITH 8 DECADE LATCH AND MULTIPLEXER
More results

类似说明 - LS7031_03

制造商部件名数据表功能描述
logo
LSI Computer Systems
LS7031 LSI-LS7031 Datasheet
47Kb / 4P
   6 DECADE MOS UP COUNTER WITH 8 DECADE LATCH AND MULTIPLEXER
logo
STMicroelectronics
HCC40110B STMICROELECTRONICS-HCC40110B Datasheet
219Kb / 11P
   DECADE UP-DOWN COUNTER/DECODER/LATCH/DRIVER
logo
LSI Computer Systems
LS7055 LSI-LS7055 Datasheet
89Kb / 6P
   6 DECADE PREDETERMINING UP/DOWN COUNTER
logo
STMicroelectronics
HCF40110B STMICROELECTRONICS-HCF40110B_02 Datasheet
430Kb / 10P
   DECADE UP/DOWN COUNTER/DECODER/LATCH/DRIVER
logo
List of Unclassifed Man...
TC5032P ETC-TC5032P Datasheet
274Kb / 9P
   6-DIGIT DECADE COUNTER
logo
Fairchild Semiconductor
4510B FAIRCHILD-4510B Datasheet
184Kb / 4P
   UP/DOWN DECADE COUNTER
logo
Texas Instruments
CD40110B TI1-CD40110B_09 Datasheet
431Kb / 12P
[Old version datasheet]   CMOs Decade Up-Down Counter/Latch/Display Driver
CD40110B TI-CD40110B Datasheet
324Kb / 10P
[Old version datasheet]   CMOS DECADE UP-DOWN COUNTER/LATCH/DISPLAY DRIVER
logo
LSI Computer Systems
LS7030 LSI-LS7030_03 Datasheet
68Kb / 4P
   8 DECADE MULTIPLEXED COUNTER
LS7030 LSI-LS7030 Datasheet
66Kb / 4P
   8 DECADE MULTIPLEXED COUNTER
More results


Html Pages

1 2 3 4


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com