MC74F1245ND [MOTOROLA]
暂无描述;
| 型号： | MC74F1245ND |
| 厂家： | 
MOTOROLA |
| 描述： | 暂无描述 输出元件 输入元件 |
| 文件： | 总3页 (文件大小：84K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MC74F1245
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 3-STATE
INPUTS/OUTPUTS
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 3-STATE
INPUTS/OUTPUTS
The MC74F1245 contains eight noninverting bidirectional buffers with
3-state outputs and is intended for bus-oriented applications. Current sinking
capability is 24 mA at the A ports and 64 mA at the B ports. The Transmit/
Receive (T/R) input determines the direction of data flow through the bidirec-
tional transceiver. Transmit (active HIGH) enables data from A ports to B
ports; Receive (active LOW) enables data from B ports to A ports. The Output
Enable input, when HIGH, disables both A and B ports by placing them in a
high-Z condition.
FAST SCHOTTKY TTL
• Noninverting Buffers
• Bidirectional Data Path
• B Outputs Sink 64 mA
• High Impedance Inputs for Reduced Loading
• Same Function and Pinout as the F245
• ESD Protection > 4000 Volts
J SUFFIX
CERAMIC
CASE 732-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
PIN ASSIGNMENT
V
OE
19
B
B
B
B
B
B
B
B
7
CC
0
1
2
3
4
5
6
20
20
18
17
16
15
14
13
12
11
1
DW SUFFIX
SOIC
CASE 751D-03
20
1
1
2
3
4
5
6
8
9
10
7
T/R
A
A
A
A
A
A
A
A
7
GND
0
1
2
3
4
5
6
LOGIC SYMBOL
ORDERING INFORMATION
2
3
4
5
6
7
8
9
MC74FXXXXJ Ceramic
MC74FXXXXN Plastic
MC74FXXXXDW SOIC
A
A
A
A
A
A
A
A
0
1
2
3
4
5
6
7
19
1
OE
T/R
B
B
B
B
B
B
B
B
0
1
2
3
4
5
6 7
18 17 16 15 14 13 12 11
GUARANTEED OPERATING RANGES
Symbol
Parameter
DC Supply Voltage
Operating Ambient Temperature Range
Min
4.5
0
Typ
5.0
25
—
Max
5.5
70
Unit
V
V
CC
74
74
74
74
74
74
T
A
°C
I
I
I
I
Output Current
Output Current
Output Current
Output Current
High
Low
High
Low
A
n
A
n
B
n
B
n
Outputs
Outputs
Outputs
Outputs
—
—
—
—
–3.0
24
mA
mA
mA
mA
OH
OL
OH
OL
—
—
–15
64
—
FAST AND LS TTL DATA
4-264
MC74F1245
FUNCTION TABLE
Inputs
Inputs/Outputs
OE
L
T/R
L
A
B
n
n
A = B
Inputs
Z
Inputs
B = A
Z
L
H
H
X
H = HIGH voltage level: L = LOW voltage level: X = Don’t care: Z = HIGH impedance “off” state.
LOGIC DIAGRAM
A
A
A
A
A
A
A
A
7
0
1
2
3
4
5
6
2
3
4
5
6
7
8
9
V
= PIN 20
CC
GND = PIN 10
19
1
OE
T/R
18
0
17
1
16
15
14
13
5
12
6
11
B
B
B
B
B
B
B
B
7
2
3
4
FAST AND LS TTL DATA
4-265
MC74F1245
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Test Conditions
(Note 1)
Min
2.0
—
Typ
—
Max
—
Symbol
Parameter
Unit
V
V
IH
Input HIGH Voltage
Input LOW Voltage
Guaranteed Input HIGH Voltage
Guaranteed Input LOW Voltage
V
IL
—
0.8
–1.2
—
V
V
IK
Input Clamp Diode Voltage
—
–0.73
3.3
3.3
3.4
3.4
—
V
V
= MIN, I = –18 mA
IN
CC
74
74
74
74
74
74
74
2.4
2.7
2.4
2.7
2.0
—
V
V
CC
V
CC
V
CC
V
CC
V
CC
= 4.5 V
= 4.75 V
= 4.5 V
= 4.75 V
= 4.5 V
V
Output HIGH Voltage A Outputs
n
I
= –3.0 mA
OH
OH
OH
—
V
—
V
I
= –3.0 mA
= –15 mA
OH
OH
—
V
V
Output HIGH Voltage B Outputs
n
—
V
I
I
I
V
V
Output LOW Voltage A
Output LOW Voltage B
0.35
—
0.5
0.55
70
V
= 24 mA
= 64 mA
OL
n Outputs
OL
OL
V
CC
= MIN
—
V
OL
n Outputs
I
Output Off Current HIGH
Output Off Current LOW
—
—
µA
µA
µA
µA
µA
mA
mA
µA
µA
mA
mA
V
V
V
= MAX
V
OUT
= 2.7 V
OZH
CC
CC
CC
CC
I
—
—
–70
40
= MAX, V
= 0.5 V
OZL
OUT
OE, T/R Inputs
—
—
= MAX, V = 2.7 V
IN
A , B Inputs
—
—
70
V
= MAX, V = 2.7 V
IN
n
n
I
IH
Input HIGH Current
OE, T/R Inputs
—
—
100
1.0
2.0
–40
–70
–150
–225
120
120
130
V
= 0 V, V = 7.0 V
IN
CC
CC
CC
B
A
Inputs
Inputs
—
—
V
V
= 0 V, V = 5.5 V
IN
n
I
Input HIGH Current
Input LOW Current
—
—
= 0 V, V = 5.5 V
IN
IHH
n
OE, T/R Inputs
—
—
I
IL
V
= MAX, V = 0.5 V
IN
CC
CC
A , B Inputs
n
—
—
n
A
Outputs
–60
–100
—
—
Output Short Circuit Current
(Note 2)
n
n
I
V
= MAX, V = GND
OUT
OS
CC
B
Outputs
—
I
—
CCH
I
—
—
mA
I
Power Supply Current
V
CC
= MAX
CCL
CCZ
I
—
—
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.
AC ELECTRICAL CHARACTERISTICS
74F
74F
T
= +25°C
= +5.0 V
= 50 pF
T
= 0°C to +70°C
= +5.0 V ±10%
C = 50 pF
L
A
A
V
CC
V
CC
C
L
Symbol
Parameter
Min
Max
Min
Max
Unit
t
t
Propagation Delay
Transparent Mode A to B or B to A
n
2.0
2.5
6.5
7.5
1.5
2.0
7.0
8.0
ns
PLH
PHL
n
n
n
t
t
3.0
4.0
8.0
10.0
2.5
3.5
9.0
11.0
ns
ns
PZH
PZL
Output Enable Time
Output Disable Time
t
t
2.0
1.0
8.0
10.0
1.5
1.0
9.0
11.0
PHZ
PLZ
FAST AND LS TTL DATA
4-266
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