參數(shù)資料
型號(hào)： SNC54148J
廠商： TEXAS INSTRUMENTS INC
元件分類： 算術(shù)邏輯單元
英文描述： TTL/H/L SERIES, 8-BIT ENCODER, INVERTED OUTPUT, CDIP16
封裝： CERAMIC, DIP-16
文件頁(yè)數(shù)： 12/24頁(yè)
文件大?。?/td> 758K
代理商： SNC54148J
SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10LINE TO 4LINE AND 8LINE TO 3LINE PRIORITY ENCODERS
SDLS053B OCTOBER 1976 REVISED MAY 2004
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information
These TTL encoders feature priority decoding of the inputs to ensure that only the highest-order data line is
encoded. The ’147 and ’LS147 devices encode nine data lines to four-line (8-4-2-1) BCD. The implied decimal
zero condition requires no input condition, as zero is encoded when all nine data lines are at a high logic level.
The ’148 and ’LS148 devices encode eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry
(enable input EI and enable output EO) has been provided to allow octal expansion without the need for external
circuitry. For all types, data inputs and outputs are active at the low logic level. All inputs are buffered to represent
one normalized Series 54/74 or 54/74LS load, respectively.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP N
Tube
SN74LS148N
0
°C to 70°C
SOIC D
Tube
SN74LS148D
LS148
0
°C to 70°C
SOIC D
Tape and reel
SN74LS148DR
LS148
SOP NS
Tape and reel
SN74LS148NSR
74LS148
CDIP J
Tube
SNJ54LS148J
55
°C to 125°C
CFP W
Tube
SNJ54LS148W
55 C to 125 C
LCCC FK
Tube
SNJ54LS148FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
FUNCTION TABLE ’147, ’LS147
INPUTS
OUTPUTS
1
2
3
4
5
6
7
8
9
D
C
B
A
H
X
XX
X
L
HH
L
X
XX
L
H
L
HH
H
X
XX
X
L
H
LL
L
X
XX
L
H
LL
H
X
L
HH
H
LH
L
X
L
H
HH
H
LH
H
X
L
HH
H
HL
L
X
L
H
HH
H
HLH
L
H
L
H = high logic level, L = low logic level, X = irrelevant
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SNC54157J TTL/H/L SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, CDIP16
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