參數(shù)資料
型號： SN74LS490D
廠商： MOTOROLA INC
元件分類： 通用總線功能
英文描述： DUAL DECADE COUNTER
中文描述： LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, PDSO16
封裝： SOIC-16
文件頁數(shù)： 1/5頁
文件大?。?/td> 161K
代理商： SN74LS490D
LOGIC DIAGRAM
(ONE HALF SHOWN)
TRUTH TABLE
5-563
FAST AND LS TTL DATA
DUAL DECADE COUNTER
The SN54/74LS490 contains a pair of high-speed 4-stage ripple counters.
Each half of the SN54/74LS490 has individual Clock, Master Reset and Mas-
ter Set (Preset 9) inputs. Each section counts in the 8, 4, 2, 1 BCD code.
Dual Version of SN54/74LS490
Individual Asynchronous Clear and Preset to 9 for Each Counter
Count Frequency — Typically 65 MHz
Input Clamp Diodes Limit High-Speed Termination Effects
CONNECTION DIAGRAM DIP
(TOP VIEW)
PIN NAMES
LOADING
(Note a)
HIGH
LOW
MS
MR
CP
Q0–Q3
Master Set (Set to 9) Input
Master Reset
Clock Input (Active LOW Going Edge)
Counter Outputs (Note b)
0.5 U.L.
0.5 U.L.
1.5 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
1.5 U.L.
5 (2.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40
μ
A HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial
(74) Temperature Ranges.
OUTPUTS
COUNT
Q3
L
L
L
Q2
L
L
L
Q1
L
L
H
Q0
L
H
L
0
1
2
3
4
5
L
L
L
L
H
H
H
L
L
H
L
H
6
7
8
9
L
L
H
H
H
H
L
L
H
H
L
L
L
H
L
H
SN54/74LS490
DUAL DECADE COUNTER
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
16
1
D SUFFIX
SOIC
CASE 751B-03
相關(guān)PDF資料
PDF描述
SN54LS490 Octal Buffer/Line Driver, 3 State; Package: TSSOP 20 LEAD; No of Pins: 20; Container: Tape and Reel; Qty per Container: 2500
SN54LS490J DUAL DECADE COUNTER
SN74LS490N 1A, 5V,±4% Tolerance, Negative Voltage Regulator, Ta = 0°C to +125&x0176;C; Package: TO-220, SINGLE GAUGE; No of Pins: 3; Container: Rail; Qty per Container: 50
SN74LS51D 1A, 8V,±2% Tolerance, Negative Voltage Regulator, Ta = 0°C to +125°C; Package: TO-220, SINGLE GAUGE; No of Pins: 3; Container: Rail; Qty per Container: 50
SN74LS51N 1A, 8V,±4% Tolerance, Negative Voltage Regulator, Ta = 0°C to +125°C; Package: 3 LEAD D2PAK; No of Pins: 3; Container: Tape and Reel; Qty per Container: 800
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SN74LS490N 制造商:Motorola Inc 功能描述: 制造商:Panasonic Industrial Company 功能描述:IC 制造商:Rochester Electronics LLC 功能描述:
SN74LS4N 制造商:Motorola Inc 功能描述:
SN74LS508N 制造商:Texas Instruments 功能描述:
SN74LS51D 功能描述:邏輯門 AND-OR-Invert Gate RoHS:否 制造商:Texas Instruments 產(chǎn)品:OR 邏輯系列:LVC 柵極數(shù)量:2 線路數(shù)量（輸入/輸出）:2 / 1 高電平輸出電流:- 16 mA 低電平輸出電流:16 mA 傳播延遲時間:3.8 ns 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DCU-8 封裝:Reel
SN74LS51DE4 功能描述:邏輯門 AND-OR-Invert Gate RoHS:否 制造商:Texas Instruments 產(chǎn)品:OR 邏輯系列:LVC 柵極數(shù)量:2 線路數(shù)量（輸入/輸出）:2 / 1 高電平輸出電流:- 16 mA 低電平輸出電流:16 mA 傳播延遲時間:3.8 ns 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DCU-8 封裝:Reel
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