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74ALS646-1 반도체 회로 부품 판매점

Transceiver/register



NXP Semiconductors 로고
NXP Semiconductors
74ALS646-1 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
74ALS646/74ALS646–1
74ALS648/74ALS648–1
Transceiver/register
Product specification
IC05 Data Handbook
Philips
Semiconductors
1991 Feb 08


74ALS646-1 데이터시트, 핀배열, 회로
Philips Semiconductors
Product specification
Transceiver/register
74ALS646/74ALS646-1
74ALS648/74ALS648-1
74ALS646/646-1
74ALS648/648-1
Octal transceiver/register, non-inverting (3-State)
Octal transceiver/register, inverting (3-State)
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 IOL within the ±5% VCC 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 VCC is
limited to 5.0V ±0.25V.
TYPE
74ALS646/646-1
74ALS648/648-1
TYPICAL fMAX
140MHz
140MHz
TYPICAL
SUPPLY CURRENT
(TOTAL)
48mA
54mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
24-pin plastic DIP
74ALS646N, 74ALS646-1N,
74ALS648N, 74ALS648-1N
24-pin plastic SOL
74ALS646D, 74ALS646-1D,
74ALS648D, 74ALS648-1D
DRAWING
NUMBER
SOT222-1
SOT137-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
A0 – A7
A inputs
1.0/1.0
B0 – B7
B inputs
1.0/1.0
CPAB
A-to-B clock input
1.0/1.0
CPBA
B-to-A clock input
1.0/1.0
SAB
A-to-B select input
1.0/1.0
SBA
B-to-A select input
1.0/1.0
DIR Data flow directional control input
1.0/1.0
OE Output enable input
1.0/1.0
A0 – A7, B0 – B7
Data outputs
750/240
A0 – A7, B0 – B7
Data outputs (-1 version)
750/480
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
LOAD VALUE
HIGH/LOW
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
20µA/0.1mA
15mA/24mA
15mA/48mA
1991 Feb 08
2 853–1408 01670




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74ALS646-1 transceiver

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