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參數(shù)資料
| 型號： | 74ALS646N |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通用總線功能 |
| 英文描述： | Transceiver/register |
| 中文描述： | ALS SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDIP24 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-24 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 155K |
| 代理商： | 74ALS646N |
Philips Semiconductors
Product specification
74ALS646/74ALS646-1
74ALS648/74ALS648-1
Transceiver/register
74ALS646/646-1
74ALS648/648-1
Octal transceiver/register, non-inverting (3-State)
Octal transceiver/register, inverting (3-State)
2
1991 Feb 08
853–1408 01670
FEATURES
Combines 74ALS245 and two 74ALS374 type functions in
one chip
Independent registers for A and B buses
Multiplexed real-time and stored data
Choice of non-inverting and inverting data paths
3-State outputs
The -1 version sink 48mA I
OL
within the
±
5% V
CC
range
DESCRIPTION
The 74ALS646/74ALS646-1 and 74ALS648/74ALS648-1
transceivers/registers consist of bus transceiver circuits with 3-State
outputs, D-type flip-flops, and control circuitry arranged for
multiplexed transmission of data directly from the input bus or the
internal registers. Data on the A or B bus will be clocked into the
registers as the appropriate clock pin goes High. Output enable
(OE) and direction (DIR) and select (SAB, SBA) pins are provided
for bus management.
The 74ALS646-1 and 74ALS648-1 will sink 48mA if the V
CC
is
limited to 5.0V
±
0.25V.
TYPE
TYPICAL f
MAX
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS646/646-1
140MHz
48mA
74ALS648/648-1
140MHz
54mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±
10%,
T
amb
= 0
°
C to +70
°
C
DRAWING
NUMBER
24-pin plastic DIP
74ALS646N, 74ALS646-1N,
74ALS648N, 74ALS648-1N
SOT222-1
24-pin plastic SOL
74ALS646D, 74ALS646-1D,
74ALS648D, 74ALS648-1D
SOT137-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
A0 – A7
A inputs
1.0/1.0
20
μ
A/0.1mA
B0 – B7
B inputs
1.0/1.0
20
μ
A/0.1mA
CPAB
A-to-B clock input
1.0/1.0
20
μ
A/0.1mA
CPBA
B-to-A clock input
1.0/1.0
20
μ
A/0.1mA
SAB
A-to-B select input
1.0/1.0
20
μ
A/0.1mA
SBA
B-to-A select input
1.0/1.0
20
μ
A/0.1mA
DIR
Data flow directional control input
1.0/1.0
20
μ
A/0.1mA
OE
Output enable input
1.0/1.0
20
μ
A/0.1mA
A0 – A7, B0 – B7
Data outputs
750/240
15mA/24mA
A0 – A7, B0 – B7
NOTE:
One (1.0) ALS unit load is defined as: 20
μ
A in the High state and 0.1mA in the Low state.
Data outputs (-1 version)
750/480
15mA/48mA
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 74ALS648 | Transceiver/register |
| 74ALS648-1 | Transceiver/register |
| 74ALS648-1D | Transceiver/register |
| 74ALS648-1N | Transceiver/register |
| 74ALS648D | Transceiver/register |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74ALS647-1NT | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| 74ALS648 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Transceiver/register |
| 74ALS648-1 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Transceiver/register |
| 74ALS648-1D | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Transceiver/register |
| 74ALS648-1N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Transceiver/register |
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