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MC74AC245, MC74ACT245
Octal Bidirectional
Transceiver with 3-State
Inputs/Outputs
The MC74AC245/74ACT245 contains eight non–inverting
bidirectional buffers with 3–state outputs and is intended for
bus–oriented applications. Current sinking capability is 24 mA at both
the A and 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.
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PDIP–20
N SUFFIX
CASE 738
20
1
•
•
•
•
Noninverting Buffers
Bidirectional Data Path
A and B Outputs Source/Sink 24 mA
′ACT245
Has TTL Compatible Inputs
VCC
20
OE
19
B0
18
B1
17
B2
16
B3
15
B4
14
B5
13
B6
12
B7
11
20
1
SO–20
DW SUFFIX
CASE 751
20
1
TSSOP–20
DT SUFFIX
CASE 948E
EIAJ–20
M SUFFIX
CASE 967
20
1
ORDERING INFORMATION
Device
1
T/R
2
A0
3
A1
4
A2
5
A3
6
A4
7
A5
8
A6
9
A7
10
GND
MC74AC245N
MC74ACT245N
MC74AC245DW
MC74AC245DWR2
Package
PDIP–20
PDIP–20
SOIC–20
SOIC–20
SOIC–20
SOIC–20
TSSOP–20
Shipping
18 Units/Rail
18 Units/Rail
38 Units/Rail
1000 Tape & Reel
38 Units/Rail
1000 Tape & Reel
75 Units/Rail
Figure 1.
PIN ASSIGNMENT
PIN
OE
T/R
A0–A7
B0–B7
FUNCTION
MC74ACT245DW
MC74ACT245DWR2
Output Enable Input
Transmit/Receive Input
Side A 3–State Inputs or 3–State Outputs
Side B 3–State Inputs or 3–State Outputs
MC74AC245DT
MC74AC245DTR2
MC74ACT245DT
MC74ACT245DTR2
TSSOP–20 2500 Tape & Reel
TSSOP–20
75 Units/Rail
TSSOP–20 2500 Tape & Reel
EIAJ–20
EIAJ–20
EIAJ–20
EIAJ–20
40 Units/Rail
2000 Tape & Reel
40 Units/Rail
2000 Tape & Reel
TRUTH TABLES
Inputs
Outputs
O tp ts
OE
L
L
H
T/R
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
MC74AC245M
MC74AC245MEL
MC74ACT245M
MC74ACT245MEL
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 192 of this data sheet.
Semiconductor Components Industries, LLC, 2001
187
May, 2001 – Rev. 5
Publication Order Number:
MC74AC245/D
MC74AC245, MC74ACT245
MAXIMUM RATINGS*
Symbol
VCC
VIN
VOUT
IIN
IOUT
ICC
Tstg
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC VCC or GND Current per Output Pin
Storage Temperature
Value
–0.5 to +7.0
–0.5 to VCC +0.5
–0.5 to VCC +0.5
±20
±50
±50
–65 to +150
Unit
V
V
V
mA
mA
mA
°C
*Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the
Recommended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VIN, VOUT
Supply
S ppl Voltage
DC Input Voltage, Output Voltage (Ref. to GND)
VCC @ 3.0 V
tr, tf
Input Rise and Fall Time (Note 1)
′AC
Devices except Schmitt Inputs
VCC @ 4.5 V
VCC @ 5.5 V
tr, tf
TJ
TA
IOH
IOL
In ut
Input Rise and Fall Time (Note 2)
′ACT
Devices except Schmitt Inputs
Junction Temperature (PDIP)
Operating Ambient Temperature Range
Output Current – High
Output Current – Low
VCC @ 4.5 V
VCC @ 5.5 V
Parameter
′AC
′ACT
Min
2.0
4.5
0
–
–
–
–
–
–
–40
–
–
Typ
5.0
5.0
–
150
40
25
10
8.0
–
25
–
–
Max
6.0
5.5
VCC
–
–
–
–
ns/V
–
140
85
–24
24
°C
°C
mA
mA
ns/V
V
V
Unit
1. VIN from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.
2. VIN from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
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188
MC74AC245, MC74ACT245
DC CHARACTERISTICS
74AC
Symbol
Parameter
VCC
(V)
TA = +25°C
Typ
VIH
Minimum High Level
g
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
g
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
VOL
Maximum Low Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
IIN
IOZT
Maximum Input
Leakage Current
Maximum
3-State
C
Current
†Minimum Dynamic
Output C
O t t Current
t
Maximum Q
Quiescent
Supply Current
5.5
55
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
–
–
–
0.002
0.001
0.001
–
–
–
–
74AC
TA =
–40°C to
+85°C
Unit
Conditions
Guaranteed Limits
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
±0.1
±0
1
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
0.1
0.1
0.1
0.44
0.44
0.44
±1.0
±1
0
V
VOUT = 0.1 V
or VCC – 0.1 V
VOUT = 0.1 V
or VCC – 0.1 V
IOUT = –50
µA
V
*VIN = VIL or VIH
–12 mA
IOH
–24 mA
–24 mA
IOUT = 50
µA
V
*VIN = VIL or VIH
12 mA
IOL
24 mA
24 mA
VI = VCC, GND
VI (OE) = VIL, VIH
VI = VCC, GND
VO = VCC, GND
VOLD = 1.65 V Max
VOHD = 3.85 V Min
VIN = VCC or GND
VIL
V
VOH
V
V
µA
5.5
5.5
5.5
5.5
55
–
–
–
–
±0.6
–
–
8.0
80
±6.0
75
–75
80.0
80 0
µA
mA
mA
µA
IOLD
IOHD
ICC
*All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
NOTE: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.
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189
MC74AC245, MC74ACT245
AC CHARACTERISTICS
(For Figures and Waveforms – See Section 3)
74AC
Symbol
Parameter
VCC*
(V)
Min
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Propagation Delay
An to Bn or Bn to An
Propagation Delay
An to Bn or Bn to An
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
1.5
1.5
1.5
1.5
2.5
1.5
2.5
1.5
2.0
1.5
2.0
1.5
TA = +25°C
CL = 50 pF
Typ
5.0
3.5
5.0
3.5
7.0
5.0
7.5
5.5
6.5
5.5
7.0
5.5
Max
8.5
6.5
8.5
6.0
11.5
8.5
12.0
9.0
12.0
9.0
11.5
9.0
74AC
TA = –40°C
to +85°C
CL = 50 pF
Min
1.0
1.0
1.0
1.0
2.0
1.0
2.0
1.0
1.0
1.0
1.5
1.0
Max
9.0
7.0
9.0
7.0
12.5
9.0
13.5
9.5
12.5
10.0
13.0
10.0
ns
ns
ns
ns
ns
ns
3–5
3–5
3–7
3–8
3–7
3–8
Unit
Fig.
No.
*Voltage Range 3.3 V is 3.3 V
±0.3
V.
Voltage Range 5.0 V is 5.0 V
±0.5
V.
DC CHARACTERISTICS
74ACT
Symbol
Parameter
VCC
(V)
TA = +25°C
Typ
VIH
VIL
VOH
Minimum High Level
g
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
g
Output Voltage
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
VOL
Maximum Low Level
Output Voltage
4.5
5.5
4.5
5.5
IIN
∆I
CCT
IOZT
Maximum Input
Leakage Current
Additional Max. ICC/Input
Maximum
3–State
Current
C
†Minimum Dynamic
O t t Current
t
Output C
Maximum Quiescent
Supply Current
55
5.5
5.5
5.5
5.5
5.5
5.5
55
1.5
1.5
1.5
1.5
4.49
5.49
–
–
0.001
0.001
–
–
–
0.6
–
–
–
–
74ACT
TA =
–40°C to
+85°C
Unit
Conditions
Guaranteed Limits
2.0
2.0
0.8
0.8
4.4
5.4
3.86
4.86
0.1
0.1
0.36
0.36
±0
1
±0.1
–
±0.6
–
–
8.0
80
2.0
2.0
0.8
0.8
4.4
5.4
3.76
4.76
0.1
0.1
0.44
0.44
±1
0
±1.0
1.5
±6.0
75
–75
80.0
80 0
V
V
V
VOUT = 0.1 V
or VCC – 0.1 V
VOUT = 0.1 V
or VCC – 0.1 V
IOUT = –50
µA
*VIN = VIL or VIH
–24 mA
IOH
–24 mA
IOUT = 50
µA
*VIN = VIL or VIH
24 mA
IOL
24 mA
VI = VCC, GND
VI = VCC – 2.1 V
VI (OE) = VIL, VIH
VI = VCC, GND
VO = VCC, GND
VOLD = 1.65 V Max
VOHD = 3.85 V Min
VIN = VCC or GND
V
V
V
µA
mA
µA
mA
mA
µA
IOLD
IOHD
ICC
*All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
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Analog electronics
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