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參數(shù)資料
| 型號： | DM74LS90N |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Decade and Binary Counters |
| 中文描述： | LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 3-BIT UP DECADE COUNTER, PDIP14 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001, DIP-14 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 61K |
| 代理商： | DM74LS90N |
2000 Fairchild Semiconductor Corporation
DS006381
www.fairchildsemi.com
August 1986
Revised March 2000
D
DM74LS90
Decade and Binary Counters
General Description
Each of these monolithic counters contains four master-
slave flip-flops and additional gating to provide a divide-by-
two counter and a three-stage binary counter for which the
count cycle length is divide-by-five for the DM74LS90.
All of these counters have a gated zero reset and the
DM74LS90 also has gated set-to-nine inputs for use in
BCD nine’s complement applications.
To use their maximum count length (decade or four bit
binary), the B input is connected to the Q
A
output. The
input count pulses are applied to input A and the outputs
are as described in the appropriate truth table. A symmetri-
cal divide-by-ten count can be obtained from the
DM74LS90 counters by connecting the Q
D
output to the A
input and applying the input count to the B input which
gives a divide-by-ten square wave at output Q
A
.
Features
I
Typical power dissipation 45 mW
I
Count frequency 42 MHz
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Reset/Count Truth Table
Order Number
DM74LS90M
DM74LS90N
Package Number
M14A
N14A
Package Description
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Reset Inputs
R0(2)
Output
Q
C
L
L
L
COUNT
COUNT
COUNT
COUNT
R0(1)
R9(1)
R9(2)
Q
D
L
L
H
Q
B
L
L
L
Q
A
L
L
H
H
H
X
X
L
L
X
H
H
X
L
X
X
L
L
X
H
X
L
X
L
X
L
H
L
X
L
X
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DM74LS90MX | Asynchronous Up Counter |
| DM74S02 | Quad 2-Input NOR Gate |
| DM74S02N | Quad 2-Input NOR Gate |
| DM74S03 | Quad 2-Input NAND Gate with Open-Collector Outputs |
| DM74S03MX | Quad 2-Input NAND Gate with Open-Collector Outputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DM74LS962N | 制造商:Texas Instruments 功能描述:Shift Register, 18 Pin, Plastic, DIP |
| DM74LSR173 WAF | 制造商:Texas Instruments 功能描述: |
| DM74LSR196 WAF | 制造商:Texas Instruments 功能描述: |
| DM74S00 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DM74S00J | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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