SN54LS623J [MOTOROLA]
OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUT; 具有三态输出的八路总线收发器
| 型号： | SN54LS623J |
| 厂家： | 
MOTOROLA |
| 描述： | OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUT |
| 文件： | 总3页 (文件大小：74K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS623
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUT
The SN54/74LS623 series is an octal bus transceiver designed for
asynchronous two-way communication between data buses. Control function
implementation allows maximum timing flexibility. Enable inputs may be used
to disable the device so that buses are effectively isolated. Depending on the
Logic Levels at the enable inputs, Data transmission is allowed from the A bus
to the B bus or from the B bus to the A bus. The dual-enable configuration
gives the LS623 the capability to store data by simultaneous enabling of GBA
and GAB. Each output reinforces its input in this transceiver configuration.
Thus, when both control inputs are enabled all other data sources to the two
sets of bus lines (16 in all) will remain at their last states.
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUT
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 732-03
20
1
CONNECTION DIAGRAM (TOP VIEW)
ENABLE
GBA
N SUFFIX
PLASTIC
CASE 738-03
V
B1
18
B2
17
B3
16
B4
15
B5
14
B6
13
B7
12
B8
11
CC
20
19
20
1
DW SUFFIX
SOIC
CASE 751D-03
20
1
1
2
3
4
5
6
8
9
10
7
ENABLE A1
GAB
A2
A3
A4
A5
A6
A7
A8 GND
ORDERING INFORMATION
BLOCK DIAGRAM
1/4 LS623
SN54LSXXXJ
Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
GBA
GAB
A1
B1
FUNCTION TABLE
ENABLE INPUTS
OPERATION
LS623
A2
B2
GBA
L
GAB
L
H
L
B data to A bus
A data to B bus
Isolation
H
TO OTHER SIX
TRANSCEIVERS
H
B data to A bus,
A data to B bus
L
H
H = HIGH Level, L = LOW Level, X = Irrelevant
FAST AND LS TTL DATA
5-1
SN54/74LS623
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
Operating Ambient Temperature Range
Output Current — High
54
74
–55
0
25
25
125
70
°C
A
54, 74
–3.0
mA
mA
I
OH
54
74
–12
–15
I
Output Current — Low
54
74
12
24
mA
OL
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.5
0.6
Guaranteed Input LOW Voltage for
All Inputs
V
IL
Input LOW Voltage
V
V
V
–V –
Hysteresis
0.2
0.4
–0.65
3.4
V
V
V
V
V
V
V
V
= MIN
T+
T
CC
CC
CC
CC
Input Clamp Diode Voltage
–1.5
= MIN, I = –18 mA
IN
IK
54, 74
54, 74
2.4
2.0
= MIN, I
= ± 3.0 mA
OH
OH
V
V
Output HIGH Voltage
Output LOW Voltage
OH
= MIN, I
= MAX
V
V
= V
MIN,
54, 74
74
0.25
0.35
0.4
0.5
V
V
I
= 12 mA
= 24 mA
CC
IN
CC
OL
= V or V
IL IH
OL
I
per Truth Table
OL
I
I
Output Off Current HIGH
Output Off Current LOW
20
µA
µA
V
= MAX, V
= MAX, V
= 2.7 V
= 4.0 V
OZH
CC
CC
OUT
–400
V
OZL
OUT
A, or B, GBA or
GAB
20
µA
V
CC
= MAX, V = 2.7 V
IN
I
Input HIGH Current
Input LOW Current
IH
GAB or GAB
A or B
0.1
0.1
mA
mA
mA
mA
V
CC
V
CC
V
CC
V
CC
= MAX, V = 7.0 V
IN
= MAX, V = 5.5 V
IN
I
I
–0.4
–225
= MAX, V = 0.4 V
IN
IL
Short Circuit Current (Note 1)
–40
= MAX
OS
Power Supply Current
Total Output HIGH
70
90
95
I
mA
V
CC
= MAX
CC
Total Output LOW
Total at HIGH Z
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
5-2
SN54/74LS623
AC CHARACTERISTICS (T = 25°C, V
CC
= 5.0 V)
A
Limits
Symbol
Parameter
Propagation Delay
Unit
Test Conditions
Min
Typ
Max
t
t
8.0
11
15
15
PLH
PHL
ns
A to B
t
t
Propagation Delay
B to A
8.0
11
15
15
PLH
PHL
ns
ns
ns
ns
ns
C
R
= 45 pF,
= 667 Ω
L
L
t
t
Output Enable Time
GBA to A
31
26
40
40
PZL
PZH
t
t
Output Enable Time
GAB to B
31
26
40
40
PZL
PZH
t
t
Output Disable Time
GBA to A
15
15
25
25
PLZ
PHZ
C
= 5.0 pF
L
t
t
Output Disable Time
GAB to B
15
15
25
25
PLZ
PHZ
FAST AND LS TTL DATA
5-3
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