INTEGRAL IN74ACT245

IN74ACT245
OCTAL 3-STATE NONINVERTING
BUS TRANSCEIVER
High-Speed Silicon-Gate CMOS
•
•
•
•
The IN74ACT245 is identical in pinout to the LS/ALS245,
HC/HCT245. The IN74ACT245 may be used as a level converter
for interfacing TTL or NMOS outputs to High Speed CMOS
inputs.
The IN74ACT245 is a 3-state noninverting transceiver that is
used for 2-way asynchronous communication between data
buses. The device has an active-low Output Enable pin, which is
used to place the I/O ports into high-impedance states. The
Direction control determines whether data flows from A to B or
from B to A.
• TTL/NMOS Compatible Input Levels
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 4.5 to 5.5 V
Low Input Current: 1.0 µA; 0.1 µA @ 25°C
Outputs Source/Sink 24 mA
ORDERING INFORMATION
IN74ACT245N Plastic
IN74ACT245DW SOIC
TA = -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Control Inputs
Output Direction
Enable
L
L
PIN 20=VCC
PIN 10 = GND
L
H
H
X
X = don’t care
1
Operation
Data
Transmitted
from Bus B to Bus A
Data
Transmitted
from Bus A to Bus B
Buses Isolated (High
Impedance State)
IN74ACT245
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage (Referenced to GND)
-0.5 to +7.0
V
VIN
DC Input Voltage (Referenced to GND)
-0.5 to VCC +0.5
V
VOUT
DC Output Voltage (Referenced to GND)
-0.5 to VCC +0.5
V
IIN
DC Input Current, per Pin
mA
±20
IOUT
DC Output Sink/Source Current, per Pin
mA
±50
ICC
DC Supply Current, VCC and GND Pins
mA
±50
PD
Power Dissipation in Still Air, Plastic DIP+
750
mW
SOIC Package+
500
Tstg
Storage Temperature
-65 to +150
°C
260
TL
Lead Temperature, 1 mm from Case for 10
°C
Seconds
(Plastic DIP or SOIC Package)
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC
DC Supply Voltage (Referenced to GND)
VIN, VOUT DC Input Voltage, Output Voltage (Referenced to
GND)
TJ
Junction Temperature (PDIP)
TA
Operating Temperature, All Package Types
IOH
Output Current - High
IOL
Output Current - Low
t r, tf
Input Rise and Fall Time * VCC =4.5 V
VCC =5.5 V
(except Schmitt Inputs)
*
VIN from 0.8 V to 2.0 V
Min
4.5
0
-40
0
0
Max
5.5
VCC
Unit
V
V
140
+85
-24
24
10
8.0
°C
°C
mA
mA
ns/V
This device contains protection circuitry to guard against damage due to high static
voltages or electric fields. However, precautions must be taken to avoid applications of any voltage
higher than maximum rated voltages to this high-impedance circuit. For proper operation, VIN and
VOUT should be constrained to the range GND≤(VIN or VOUT)≤VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or
VCC). Unused outputs must be left open.
2
IN74ACT245
DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND)
Guaranteed
VCC
Limits
Symbol Parameter
Test Conditions
V
25 °C -40°C to
85°C
VOUT=0.1 V or VCC-0.1 V 4.5
VIH
Minimum High2.0
2.0
Level Input
5.5
2.0
2.0
Voltage
VOUT=0.1 V or VCC-0.1 V 4.5
VIL
Maximum Low 0.8
0.8
Level Input
5.5
0.8
0.8
Voltage
VOH
Minimum High4.5
4.4
4.4
IOUT ≤ -50 µA
Level Output
5.5
5.4
5.4
Voltage
*
VIN=VIH or VIL
3.76
3.86
4.5
IOH=-24 mA
4.76
4.86
5.5
IOH=-24 mA
VOL
Maximum Low4.5
0.1
0.1
IOUT ≤ 50 µA
Level Output
5.5
0.1
0.1
Voltage
*
VIN=VIH or VIL
0.44
0.36
4.5
IOL=24 mA
0.44
0.36
5.5
IOL=24 mA
IIN
Maximum Input
VIN=VCC or GND
5.5
±0.1
±1.0
Leakage Current
5.5
1.5
Additional Max.
VIN=VCC - 2.1 V
∆ICCT
ICC/Input
5.5
IOZ
Maximum Three- VIN (OE)= VIH or VIL
±0.6
±6.0
State Leakage
VIN =VCC or GND
Current
VOUT =VCC or GND
VOLD=1.65 V Max
IOLD
+Minimum
5.5
75
Dynamic Output
Current
VOHD=3.85 V Min
IOHD
+Minimum
5.5
-75
Dynamic Output
Current
VIN=VCC or GND
ICC
Maximum
5.5
8.0
80
Quiescent Supply
Current
(per Package)
*
All outputs loaded; thresholds on input associated with output under test.
+Maximum test duration 2.0 ms, one output loaded at a time.
3
Unit
V
V
V
V
µA
mA
µA
mA
mA
µA
IN74ACT245
AC ELECTRICAL CHARACTERISTICS(VCC=5.0 V ± 10%, CL=50pF, Input tr=tf=3.0 ns)
Guaranteed Limits
Unit
Symbol
Parameter
25 °C
-40°C to
85°C
Min Max Min Max
tPLH
Propagation Delay, A to B, B to A (Figure 1.5
7.5
1.5
8.0
ns
1)
tPHL
Propagation Delay, A to B, B to A (Figure 1.5
8.0
1.0
9.0
ns
1)
tPZH
Propagation Delay, Direction or Output 1.5 10.0 1.5
11.0
ns
Enable to A or B (Figure 2)
tPZL
Propagation Delay, Direction or Output 1.5 10.0 1.5
12.0
ns
Enable to A or B (Figure 2)
tPHZ
Propagation Delay, Direction or Output 1.5 10.0 1.0
11.0
ns
Enable to A or B (Figure 2)
tPLZ
Propagation Delay, Direction or Output 2.0 10.0 1.5
11.0
ns
Enable to A or B (Figure 2)
CIN
Maximum Input Capacitance
4.5
4.5
pF
COUT
Maximum Three-State I/O Capacitance
15
15
pF
(I/O in High-Impedance State)
CPD
Typical @25°C,VCC=5.0
V
45
Power Dissipation Capacitance
Figure 1. Switching Waveforms
pF
Figure 2. Switching Waveforms
4
IN74ACT245
EXPANDED LOGIC DIAGRAM
5