參數(shù)資料
型號(hào)： SN54LS490J
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, CDIP16
封裝： CERAMIC, DIP-16
文件頁數(shù)： 1/5頁
文件大?。?/td> 161K
代理商： SN54LS490J
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
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
SN74LS54D 1A, 15V,±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
SN74LS54N 1A, 15V,±4% 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
相關(guān)代理商/技術(shù)參數(shù)
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