參數(shù)資料
型號: 74LS
廠商: National Semiconductor Corporation
元件分類: 通用總線功能
英文描述: Decade and Binary Counters
中文描述: 十年和二進(jìn)制計(jì)數(shù)器
文件頁數(shù): 1/10頁
文件大?。?/td> 146K
代理商: 74LS
TL/F/6381
D
June 1989
DM74LS90/DM74LS93
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 ’LS90 and divide-
by-eight for the ’LS93.
All of these counters have a gated zero reset and the LS90
also has gated set-to-nine inputs for use in BCD nine’s com-
plement applications.
To use their maximum count length (decade or four bit bina-
ry), 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 symmetrical di-
vide-by-ten count can be obtained from the ’LS90 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
Y
Typical power dissipation 45 mW
Y
Count frequency 42 MHz
Connection Diagrams
(Dual-In-Line Packages)
TL/F/6381–1
Order Number DM74LS90M or DM74LS90N
See NS Package Number M14A or N14A
TL/F/6381–2
Order Number DM74LS93M or DM74LS93N
See NS Package Number M14A or N14A
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
相關(guān)PDF資料
PDF描述
74LVT16652 3.3V ABT 16-Bit Transceiver/Register with TRI-STATE Outputs
74LVT16652MEA 3.3V ABT 16-Bit Transceiver/Register with TRI-STATE Outputs
74LVT16652MEAX 3.3V ABT 16-Bit Transceiver/Register with TRI-STATE Outputs
74LVT16652MTD 3.3V ABT 16-Bit Transceiver/Register with TRI-STATE Outputs
74LVT16652MTDX 3.3V ABT 16-Bit Transceiver/Register with TRI-STATE Outputs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
74LS SERIES KIT 制造商:JAMECO VALUEPRO 功能描述:420 PIECE 74LS LOGIC SERIES COMPONENT KIT
74LS00 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
74LS00 WAF 制造商:Texas Instruments 功能描述:
74LS00DC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QUAD 2-INPUT NAND GATE
74LS00FC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QUAD 2-INPUT NAND GATE