Motorola MC74F245N, MC54F245DW, MC54F245J Datasheet
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
4-115
FAST AND LS TTL DATA
3
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH
3-STATE INPUTS/OUTPUTS
The MC54/74F245 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 bidirectional
transceiver. T ransmit (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.
• Noninverting Buffers
• Bidirectional Data Path
• B Outputs Sink 64 mA
• ESD
>
4000 Volts
111213141516171819
V
CC
1 2 3 4 5 6 7
20
OE B0B
1
B
2
B
4
B
3
A
1
T/R
A
0
A
2
A
3
A
5
A
4
CONNECTION DIAGRAM (TOP VIEW)
8 9 10
B
5
B
7
B
6
A
6
GNDA
7
FUNCTION TABLE
Inputs
OE T/R Output
L
L
H
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
High-Z State
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
CC
Supply Voltage 54, 74 4.5 5.0 5.5 V
T
A
Operating Ambient Temperature Range 54 –55 25 125 °C
74 0 25 70
I
OH
Output Current — High An Outputs 54, 74 –3.0 mA
74 24 mA
IOLOutput Current — Low
An Outputs
54 20 mA
I
OH
Output Current — High Bn Outputs
54
74
–12
–15
mA
I
OL
Output Current — Low Bn Outputs
54
74
48
64
mA
DW SUFFIX
SOIC
CASE 751D-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
20
1
J SUFFIX
CERAMIC
CASE 732-03
20
1
MC54/74F245
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 3-STATE
INPUTS/OUTPUTS
FAST SCHOTTKY TTL
ORDERING INFORMATION
MC54FXXXJ Ceramic
MC74FXXXN Plastic
MC74FXXXDW SOIC
4-116
FAST AND LS TTL DATA
MC54/74F245
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
V
IH
Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage
V
IL
Input LOW Voltage 0.8 V Guaranteed Input LOW Voltage
V
IK
Input Clamp Diode Voltage –1.2 V IIN = –18 mA VCC = MIN
V
OH
Output HIGH Voltage, An Outputs 54, 74 2.4 3.3 V IOH = –3.0 mA VCC = 4.50 V
74 2.7 3.3 V IOH = –3.0 mA VCC = 4.75 V
54, 74 2.4 3.4 V IOH = –3.0 mA VCC = 4.50 V
V
OH
Output HIGH Voltage, Bn Outputs 74 2.7 3.4 V IOH = –3.0 mA VCC = 4.75 V
54 2.0 V IOH = –12 mA VCC = 4.50 V
74 2.0 V IOH = –15 mA
V
OL
Output LOW Voltage, An Outputs 54 0.35 0.5 V IOL = 20 mA VCC = MIN
74 0.35 0.5 V IOL = 24 mA
V
OL
Output LOW Voltage, Bn Outputs 54 0.55 V IOL = 48 mA VCC = MIN
74 0.55 V IOL = 64 mA
I
OZH
+ IIHOutput Off Current HIGH 70 µA V
OUT
= 2.7 V VCC = MAX
I
OZL
+ I
IL
Output Off Current LOW –650 mA V
OUT
= 0.5 V VCC = MAX
OE, T/R Inputs 20 µA VIN = 2.7 V
I
IH
Input HIGH Current OE, T/R Inputs 100 µA VIN = 7.0 V VCC = MAX
An, Bn Inputs 1.0 mA VIN = 5.5 V
T/R Input –0.8 mA
I
IL
Input LOW Current OE Input –1.2 mA VIN = 0.5 V VCC = MAX
I
OS
Output Short Circuit An Outputs –60 –150 mA V
OUT
= GND VCC = MAX
Current (Note 2) Bn Outputs –100 –225 mA V
OUT
= GND VCC = MAX
I
CCH
Power Supply Current HIGH 90 mA VCC = MAX, Outputs HIGH
I
CCL
Power Supply Current LOW 120 mA VCC = MAX, Outputs LOW
I
CCZ
Power Supply Current OFF 110 mA VCC = MAX, Outputs OFF
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.
AC CHARACTERISTICS
54/74F 54F 74F
TA = +25°C TA = -55°C to +125°C TA = 0°C to +70°C
VCC = +5.0 V VCC = 5.0 V ± 10% VCC = 5.0 V ± 10%
CL = 50 pF CL = 50 pF CL = 50 pF
Symbol Parameter Min Max Min Max Min Max Unit
t
PLH
t
PHL
Propagation Delay
An to Bn or Bn to A
n
2.5
2.5
6.0
6.0
2.5
2.5
8.0
8.0
2.5
2.5
7.0
7.0
ns
t
PZH
t
PZL
Output Enable Time 3.0
3.5
7.0
8.0
3.0
3.5
9.0
10
3.0
3.5
8.0
9.0
ns
t
PHZ
t
PLZ
Output Disable Time 2.5
2.0
6.5
6.5
2.5
2.0
8.5
8.5
2.5
2.0
7.5
7.5
ns
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