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參數(shù)資料
| 型號(hào)： | SN54LS390W |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 計(jì)數(shù)器 |
| 英文描述： | LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 3-BIT UP DECADE COUNTER, CDFP16 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 459K |
| 代理商： | SN54LS390W |
PRODUCT FOLDER | PRODUCT INFO: FEATURES | DESCRIPTION | DATASHEETS | PRICING/AVAILABILITY | APPLICATION NOTES |
PRODUCT SUPPORT: TRAINING
SN54LS393, Dual 4-Bit Binary Counters
DEVICE STATUS: ACTIVE
PARAMETER NAME SN54LS393
Voltage Nodes (V) 5
Vcc range (V)
4.5 to 5.5
Input Level
TTL
Output Level
TTL
Output
2S
Clear
Async
FEATURES
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Dual Versions of the Popular '90A, 'LS90 and '93A, 'LS93
q
'390, 'LS390 … Individual Clocks for A and B Flip-Flops Provide Dual ÷ 2 and ÷ 5 Counters
q
'393, 'LS393 … Dual 4-Bit Binary Counter with Individual Clocks
q
All Have Direct Clear for Each 4-Bit Counter
q
Dual 4-Bit Versions Can Significantly Improve System Densities by Reducing Counter Package Count
by 50%
q
Typical Maximum Count Frequency … 35 MHz
q
Buffered Outputs Reduce Possibility of Collector Commutation
q
DESCRIPTION
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Each of these monolithic circuits contains eight master-slave flip-flops and additional gating to implement
two individual four-bit counters in a single package. The '390 and 'LS390 incorporate dual divide-by-two and
divide-by-five counters, which can be used to implement cycle lengths equal to any whole and/or cumulative
multiples of 2 and/or 5 up to divide-by-100. When connected as a bi-quinary counter, the separate
divide-by-two circuit can be used to provide symmetry (a square wave) at the final output stage. The '393
and 'LS393 each comprise two independent four-bit binary counters each having a clear and a clock input.
N-bit binary counters can be implemented with each package providing the capability of divide-by-256. The
'390, 'LS390, '393, and 'LS393 have parallel outputs from each counter stage so that any submultiple of the
input count frequency is available for system-timing signals. Series 54 and Series 54LS circuits are
characterized for operation over the full military temperature range of -55°C to 125°C; Series 74 and Series
74LS circuits are characterized for operation from 0°C to 70°C.
TECHNICAL DOCUMENTS
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Product Folder:SN54LS393, Dual 4-Bit Binary Counters
file:////roarer/root/export/projects/bitting1/imagin...Avnet/20001221/11092000/TXII/11092000/sn54ls393.html (1 of 2) [1/3/2001 11:35:09 AM]
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