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參數(shù)資料
| 型號(hào)： | SN54LS490 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Octal Buffer/Line Driver, 3 State; Package: TSSOP 20 LEAD; No of Pins: 20; Container: Tape and Reel; Qty per Container: 2500 |
| 中文描述： | 雙十進(jìn)制計(jì)數(shù)器 |
| 文件頁數(shù)： | 1/5頁 |
| 文件大小： | 161K |
| 代理商： | SN54LS490 |
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 |
|---|---|
| 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 |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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| SN54LS51J | 制造商:Texas Instruments 功能描述:AND-OR-Invert Gate 2-Element 2 Wide 2-IN/3-IN Bipolar 14-Pin CDIP Tube 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:AND-OR-INVERT GATE 2-ELEM 2 WIDE 2-IN BIPOLAR 14CDIP - Rail/Tube |
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| SN54LS540J | 制造商:Texas Instruments 功能描述:Buffer/Line Driver 8-CH Inverting 3-ST Bipolar 20-Pin CDIP Tube 制造商:Texas Instruments 功能描述:BFFR/LINE DRVR 8CH INV 3-ST BIPOLAR 20CDIP - Rail/Tube |
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