參數(shù)資料
型號： 744ALS645A-1D
廠商： NXP Semiconductors N.V.
英文描述： PWR SUPP DESKTOP 5V 15W
中文描述： 八路收發(fā)器三態(tài)
文件頁數(shù)： 2/8頁
文件大小： 79K
代理商： 744ALS645A-1D
Philips Semiconductors
Product specification
74ALS645A/74ALS645A-1
Octal transceiver (3-State)
2
1991 Jun 03
853–0597 02709
FEATURES
Octal bidirectional bus interface
3-State buffer outputs sink 24mA and source 15mA
Outputs are placed in high impedance state during power-off
conditions
The -1 version sinks 48mA I
OL
within the +5% V
CC
range
DESCRIPTION
The 74ALS645A is an octal transceiver featuring non-inverting
3-State bus compatible outputs in both transmit and receive
directions. The device features an output enable (OE) input for easy
cascading and transmit/receive (R/T) input for direction control.
The 74ALS645A-1 is the same as the 74ALS645A except that both
ports sink 48mA within the
±
5% V
CC
range.
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS645A
7.0ns
34mA
74ALS645A-1
7.0ns
34mA
PIN CONFIGURATION
SF00198
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
V
CC
OE
B0
B1
B2
B3
B4
B6
B5
B7
ORDERING INFORMATION
ORDER CODE
COMMERCIAL RANGE
V
CC
= 5V
±
10%,
T
amb
= 0
°
C to +70
°
C
74ALS645AN,
74ALS645A-1N
DESCRIPTION
DRAWING
NUMBER
20-pin plastic DIP
SOT146-1
20-pin plastic SOL
74ALS645AD,
744ALS645A-1D
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
1.0/1.0
LOAD VALUE
HIGH/LOW
20
μ
A/0.1mA
20
μ
A/0.1mA
20
μ
A/0.1mA
15mA/24mA
A0 – A7, B0 – B7
Data inputs
OE
Output Enable input (active-Low)
1.0/1.0
T/R
Transmit/receive input
1.0/1.0
A0 – A7
A port outputs
750/240
B0 – B7
B port outputs
750/240
15mA/24mA
A0 – A7
A port outputs (-1 version)
750/480
15mA/48mA
B0 – B7
One (1.0) ALS unit load is defined as: 20
μ
A in the High state and 0.1mA in the Low state.
B port outputs (-1 version)
750/480
15mA/48mA
NOTE:
LOGIC SYMBOL
B2
B3
B4
B5
16
15
14
13
2
3
4
V
= Pin 20
GND = Pin 10
SF00199
B1
17
B0
18
19
1
OE
T/R
A0
A1
A2
A3
A4
A5
5
6
7
B6
B7
12
11
A6
A7
8
9
IEC/IEEE SYMBOL
SC00097
G3
19
3EN1 [BA]
3EN2 [AB]
1
1
2
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
相關(guān)PDF資料
PDF描述
74ALS645A-1N Octal transceiver 3-State
74ALS645A-1 Octal transceiver 3-State
74ALS645A Octal transceiver 3-State
74ALS645AD Octal transceiver 3-State
74ALS645AN Octal transceiver 3-State
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