MC74FXXXN [MOTOROLA]
OCTAL TRANSPARENT LATCH WITH 3-STATE OUTPUTS;
| 型号： | MC74FXXXN |
| 厂家： | 
MOTOROLA |
| 描述： | OCTAL TRANSPARENT LATCH WITH 3-STATE OUTPUTS 输出元件 |
| 文件： | 总3页 (文件大小：79K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MC54/74F373
OCTAL TRANSPARENT LATCH
WITH 3-STATE OUTPUTS
The MC54/74F373 consists of eight latches with 3-state outputs for bus or-
ganized system applications. The flip-flops appear transparent to the data
when Latch Enable (LE) is HIGH. When LE is LOW, the data that meets the
setuptimes is latched. Data appears onthebuswhentheOutputEnable(OE)
is LOW. When OE is HIGH the bus output is in the high impedance state.
OCTAL TRANSPARENT LATCH
WITH 3-STATE OUTPUTS
FAST SCHOTTKY TTL
• Eight Latches in a Single Package
• 3-State Outputs for Bus Interfacing
>
• ESD 4000 Volts
CONNECTION DIAGRAM (TOP VIEW)
J SUFFIX
CERAMIC
CASE 732-03
V
O
D
D
O
O
D
D
O
4
12
LE
11
CC
7
7
6
6
5
5
4
20
20
19
18
17
16
15
14
13
1
N SUFFIX
PLASTIC
CASE 738-03
20
1
1
2
3
4
5
6
7
8
9
10
OE
O
D
D
O
O
D
D
O
3
GND
0
0
1
1
2
2
3
DW SUFFIX
SOIC
CASE 751D-03
20
1
LOGIC SYMBOL
3
4
7
8
13 14 17 18
ORDERING INFORMATION
MC54FXXXJ
MC74FXXXN Plastic
MC74FXXXDW SOIC
Ceramic
D
LE
D
D
D
D
D
D
D
0
1
2
3
4
5
6 7
11
1
V
= PIN 20
CC
GND = PIN 10
OE
O
O
5
O
6
O
9
O
O
O
O
0
1
2
3
4
5
6 7
2
12 15 16 19
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
5.0
25
Max
5.5
125
70
Unit
V
V
CC
Supply Voltage
54, 74
54
4.5
–55
0
T
A
Operating Ambient Temperature Range
°C
74
25
I
I
Output Current — HIGH
Output Current — LOW
54, 74
54, 74
–3.0
24
mA
mA
OH
OL
FAST AND LS TTL DATA
4-167
MC54/74F373
FUNCTIONAL DESCRIPTION
The F373 contains eight D-type latches with 3-state output
buffers. WhentheLatchEnable(LE)inputisHIGH, dataonthe
preceding the HIGH-to-LOW transition of LE. The 3-state buff-
ersarecontrolledbytheOutputEnable(OE)input. When(OE)
is LOW, thebuffersareinthebi-statemode. WhenOE is HIGH
the buffers are in the high impedance mode, but this does not
interfere with entering new data into the latches.
D inputs enters the latches. In this condition the latches are
n
transparent; i.e., a latch output will change state each time its
D input changes. When LE is LOW the latches store the
information that was present on the D inputs one setup time
LOGIC DIAGRAM
D
D
1
D
D
D
4
D
D
D
7
0
2
3
5
6
D
D
D
D
D
D
D
D
O
O
O
O
O
O
O
O
G
G
G
G
G
G
G
G
LE
OE
O
0
O
O
O
3
O
O
O
O
7
1
2
4
5
6
NOTE:
This diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Input HIGH Voltage
Min
Typ
Max
Unit
V
Test Conditions
Guaranteed Input HIGH Voltage
Guaranteed Input LOW Voltage
V
IH
2.0
V
V
V
Input LOW Voltage
0.8
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–1.2
V
I
I
I
I
= –18 mA
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= MIN
IK
IN
54, 74
74
2.4
2.7
3.3
3.3
V
= – 3.0 mA
= – 3.0 mA
= 24 mA
= 4.5 V
= 4.75 V
= MIN
OH
OH
OH
OL
V
V
Output LOW Voltage
0.35
0.5
50
V
OL
OZH
OZL
IH
I
I
I
Output OFF Current — HIGH
Output OFF Current — LOW
Input HIGH Current
µA
µA
µA
µA
mA
mA
mA
V
V
V
V
V
V
= 2.7 V
= 0.5 V
= MAX
= MAX
= MAX
= MAX
= MAX
= MAX
= MAX
OUT
–50
20
OUT
= 2.7 V
IN
100
–0.6
–150
55
= 7.0 V
IN
I
I
I
Input LOW Current
= 0.5 V
IL
IN
Output Short Circuit Current (Note 2)
Power Supply Current (All Outputs OFF)
–60
= 0 V
OUT
OS
CCZ
35
OE = 4.5 V
D , LE = GND
n
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
4-168
MC54/74F373
AC CHARACTERISTICS
54/74F
= +25°C
54F
= –55°C to +125°C
74F
T
A
T
A
T = 0°C to +70°C
A
V
= +5.0 V
= 50 pF
Typ
5.3
V
= 5.0 V ± 10%
V
= 5.0 V ± 10%
CC
CC
CC
C
C
= 50 pF
C = 50 pF
L
L
L
Symbol
Parameter
Propagation Delay
to O
Min
3.0
2.0
5.0
3.0
2.0
2.0
1.5
1.5
Max
7.0
5.0
11.5
7.0
11
Min
3.0
2.0
5.0
3.0
2.0
2.0
1.5
1.5
Max
Min
3.0
2.0
5.0
3.0
2.0
2.0
1.5
1.5
Max
Unit
t
t
t
t
t
t
t
t
8.5
7.0
15
8.0
6.0
13
ns
PLH
PHL
PLH
PHL
PZH
PZL
PHZ
PLZ
D
3.7
n
n
Propagation Delay
LE to O
9.0
ns
ns
ns
5.2
8.5
13.5
10
8.0
12
n
5.0
Output Enable Time
5.6
7.5
6.5
6.0
8.5
7.5
6.0
4.5
10
Output Disable Time
3.8
7.0
AC OPERATING REQUIREMENTS
54/74F
= +25°C
54F
= –55°C to +125°C
74F
T = 0°C to +70°C
A
T
A
T
A
V
CC
= +5.0 V
Typ
V
= 5.0 V ± 10%
V = 5.0 V ± 10%
CC
CC
Symbol
t (H)
Parameter
Min
2.0
2.0
3.0
3.0
6.0
Max
Min
2.0
2.0
3.0
3.0
6.0
Max
Min
2.0
2.0
3.0
3.0
6.0
Max
Unit
Setup Time, HIGH or LOW
s
t (L)
s
D
to LE
n
ns
t (H)
h
Hold Time, HIGH or LOW
D to LE
n
t (L)
h
t (H)
w
LE Pulse Width, HIGH
ns
FAST AND LS TTL DATA
4-169
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