MOTOROLA MC74F245N

3
MC54/74F245
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH
3-STATE INPUTS/OUTPUTS
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. 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.
• Noninverting Buffers
• Bidirectional Data Path
• B Outputs Sink 64 mA
• ESD > 4000 Volts
FAST SCHOTTKY TTL
20
1
CONNECTION DIAGRAM (TOP VIEW)
VCC
20
OE
B0
18
19
B1
17
B2
16
B3
15
B4
14
B5
13
J SUFFIX
CERAMIC
CASE 732-03
B6
12
B7
11
N SUFFIX
PLASTIC
CASE 738-03
20
1
20
1
2
3
4
5
6
7
8
9
10
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
1
FUNCTION TABLE
ORDERING INFORMATION
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
DW SUFFIX
SOIC
CASE 751D-03
MC54FXXXJ
MC74FXXXN
MC74FXXXDW
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Ceramic
Plastic
SOIC
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
IOH
Output Current — High
An Outputs
IOL
Output Current — Low
An Outputs
IOH
Output Current — High
Bn Outputs
IOL
Output Current — Low
Bn Outputs
Min
Typ
54, 74
4.5
5.0
5.5
V
54
–55
25
125
°C
74
0
25
70
Unit
54, 74
–3.0
mA
74
24
mA
54
20
mA
54
–12
74
–15
54
48
74
64
FAST AND LS TTL DATA
4-115
Max
mA
mA
MC54/74F245
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
VIK
Input Clamp Diode Voltage
VOH
Output HIGH Voltage, An Outputs
VOH
VOL
VOL
Output Off Current LOW
IIH
Input HIGH Current
Test Conditions
V
Guaranteed Input HIGH Voltage
0.8
V
Guaranteed Input LOW Voltage
–1.2
V
IIN = –18 mA
VCC = MIN
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
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
Output LOW Voltage, Bn Outputs
IOZL + IIL
Unit
54, 74
Output LOW Voltage, An Outputs
Output Off Current HIGH
Max
2.0
Output HIGH Voltage, Bn Outputs
IOZH + IIH
Typ
54
0.35
0.5
V
IOL = 20 mA
VCC = MIN
74
0.35
0.5
V
IOL = 24 mA
54
0.55
V
IOL = 48 mA
74
0.55
V
IOL = 64 mA
70
µA
VOUT = 2.7 V
VCC = MAX
VCC = MAX
VCC = MIN
–650
mA
VOUT = 0.5 V
OE, T/R Inputs
20
µA
VIN = 2.7 V
OE, T/R Inputs
100
µA
VIN = 7.0 V
An, Bn Inputs
1.0
mA
VIN = 5.5 V
T/R Input
–0.8
mA
–1.2
mA
VIN = 0.5 V
VCC = MAX
VCC = MAX
IIL
Input LOW Current
OE Input
IOS
Output Short Circuit
An Outputs
–60
–150
mA
VOUT = GND
VCC = MAX
Current (Note 2)
Bn Outputs
–100
–225
mA
VOUT = GND
VCC = MAX
ICCH
Power Supply Current HIGH
90
mA
VCC = MAX, Outputs HIGH
ICCL
Power Supply Current LOW
120
mA
VCC = MAX, Outputs LOW
ICCZ
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
Symbol
Parameter
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
Min
Max
Min
Max
Min
Max
Unit
tPLH
tPHL
Propagation Delay
An to Bn or Bn to An
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
tPZH
tPZL
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
tPHZ
tPLZ
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
FAST AND LS TTL DATA
4-116