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MC74HCT245ADTG

P1-P3P4-P6P7-P9
© Semiconductor Components Industries, LLC, 2011
May, 2011 − Rev. 12
1 Publication Order Number:
MC74HCT245A/D
MC74HCT245A
Octal 3-State Noninverting
Bus Transceiver with LSTTL
Compatible Inputs
High−Performance Silicon−Gate CMOS
The MC74HCT245A is identical in pinout to the LS245. This
device may be used as a level converter for interfacing TTL or NMOS
outputs to High Speed CMOS inputs.
The MC74HCT245A 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.
Features
• Output Drive Capability: 15 LSTTL Loads
• TTL/NMOS Compatible Input Levels
• Outputs Directly Interface to CMOS, NMOS and TTL
• Operating Voltage Range: 4.5 V to 5.5 V
• Low Input Current: 1.0 mA
• In Compliance with the Requirements Defined by JEDEC Standard
No. 7 A
• Chip Complexity: 304 FETs or 76 Equivalent Gates
• These Devices are Pb−Free and are RoHS Compliant
Figure 1. Logic Diagram
A
DATA
PORT
A8
A7
A6
A5
A3
A4
A2
A1
9
8
7
6
5
4
3
2
DIRECTION
OUTPUT ENABLE
1
19
PIN 20 = V
CC
PIN 10 = GND
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
B
DATA
PORT
Design Criteria
Value Units
Internal Gate Count* 76 ea
Internal Gate Propagation Delay 1.0 ns
Internal Gate Power Dissipation 5.0
mW
Speed Power Product 0.005 pJ
*Equivalent to a two−input NAND gate.
FUNCTION TABLE
Control Inputs
Operation
Output Enable Direction
L L Data Transmitted from Bus B to Bus A
L H Data Transmitted from Bus A to Bus B
H X Buses Isolated (High−Impedance State)
X = Don’t Care
PIN ASSIGNMENT
A5
A3
A2
A1
DIRECTION
GND
A8
A7
A6
A4 5
4
3
2
1
10
9
8
7
6
14
15
16
17
18
19
20
11
12
13
B3
B2
B1
OUTPUT ENABLE
V
CC
B8
B7
B6
B5
B4
http://onsemi.com
See detailed ordering, shipping information, and marking
information in the package dimensions section on page 6 of
this data sheet.
ORDERING INFORMATION
SOIC−20W
DW SUFFIX
CASE 751D
TSSOP−20
DT SUFFIX
CASE 948E
SOEIAJ−20
F SUFFIX
CASE 967
1
1
1
PDIP−20
N SUFFIX
CASE 738
1
MC74HCT245A
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2
MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
DC Supply Voltage (Referenced to GND) – 0.5 to + 7.0 V
V
in
DC Input Voltage (Referenced to GND) – 0.5 to V
CC
+ 0.5 V
V
out
DC Output Voltage (Referenced to GND) – 0.5 to V
CC
+ 0.5 V
I
in
DC Input Current, per Pin ± 20 mA
I
out
DC Output Current, per Pin ± 35 mA
I
CC
DC Supply Current, V
CC
and GND Pins ± 75 mA
P
D
Power Dissipation in Still Air, PDIP†
SOIC Package†
TSSOP Package†
750
500
450
mW
T
stg
Storage Temperature – 65 to + 150
_C
T
L
Lead Temperature, 1 mm from Case for 10 Secs
(PDIP, SOIC, SSOP or TSSOP Package)
260
_C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress
ratings only. Functional operation above the Recommended Operating Conditions is not implied.
Extended exposure to stresses above the Recommended Operating Conditions may affect device
reliability.
†Derating — Plastic DIP: – 10 mW/_C from 65_ to 125_C
SOIC Package: – 7 mW/_C from 65_ to 125_C
TSSOP Package: − 6.1 mW/_C from 65_ to 125_C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Max Unit
V
CC
DC Supply Voltage (Referenced to GND) 4.5 5.5 V
V
in
, V
out
DC Input Voltage, Output Voltage
(Referenced to GND)
0 V
CC
V
T
A
Operating Temperature, All Package Types – 55 + 125
_C
t
r
, t
f
Input Rise and Fall Time (Figure 1) 0 500 ns
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 cir-
cuit. For proper operation, V
in
and
V
out
should be constrained to the
range GND v (V
in
or V
out
) v V
CC
.
Unused inputs must always be
tied to an appropriate logic voltage
level (e.g., either GND or V
CC
).
Unused outputs must be left open.
MC74HCT245A
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3
DC ELECTRICAL CHARACTERISTICS (Voltages Referenced to GND)
Symbol Parameter Test Conditions
V
CC
V
Guaranteed Limit
Unit
– 55 to
25_C
v 85_C v 125_C
V
IH
Minimum High−Level Input
Voltage
V
out
= 0.1 V or V
CC
– 0.1 V
|I
out
| v 20 mA
4.5
5.5
2.0
2.0
2.0
2.0
2.0
2.0
V
V
IL
Maximum Low−Level Input
Voltage
V
out
= 0.1 V or V
CC
– 0.1 V
|I
out
| v 20 mA
4.5
5.5
0.8
0.8
0.8
0.8
0.8
0.8
V
V
OH
Minimum High−Level Output
Voltage
V
in
= V
IH
or V
IL
|I
out
| v 20 mA
4.5
5.5
4.4
5.4
4.4
5.4
4.4
5.4
V
V
in
= V
IH
or V
IL
|I
out
| v 6.0 mA 4.5 3.98 3.84 3.7
V
OL
Maximum Low−Level Output
Voltage
V
in
= V
IH
or V
IL
|I
out
| v 20 mA
4.5
5.5
0.1
0.1
0.1
0.1
0.1
0.1
V
V
in
= V
IH
or V
IL
|I
out
| v 6.0 mA 4.5 0.26 0.33 0.4
I
in
Maximum Input Leakage Current V
in
= V
CC
or GND, Pins 1 or 19 5.5 ± 0.1 ± 1.0 ± 1.0
mA
I
CC
Maximum Quiescent Supply Current
(per Package)
V
in
= V
CC
or GND
I
out
= 0 mA
5.5 4.0 40 160
mA
I
OZ
Maximum Three−State
Leakage Current
Output in High−Impedance State
V
in
= V
IL
or V
IH
V
out
= V
CC
or GND, I/O Pins
5.5 ± 0.5 ± 5.0 ± 10
mA
DI
CC
Additional Quiescent Supply
Current
V
in
= 2.4 V, Any One Input
V
in
= V
CC
or GND, Other Inputs
l
out
= 0 mA
5.5
≥ −55_C 25_C to 125_C
mA
2.9 2.4
AC ELECTRICAL CHARACTERISTICS (V
CC
= 5.0 V ± 10%, C
L
= 50 pF, Input t
r
= t
f
= 6.0 ns)
Symbol Parameter
Guaranteed Limit
Unit
– 55 to
25_C
v 85_C v 125_C
t
PLH
,
t
PHL
Maximum Propagation Delay, A to B or B to A
(Figures 2 and 4)
22 28 33 ns
t
PLZ
,
t
PHZ
Maximum Propagation Delay, Direction or Output Enable to A or B
(Figures 3 and 5)
30 36 42 ns
t
PZL
,
t
PZH
Maximum Propagation Delay, Output Enable to A or 8
(Figures 3 and 5)
30 36 42 ns
t
TLH
,
t
THL
Maximum Output Transition Time. any Output
(Figures 2 and 4)
12 15 18 ns
C
in
Maximum Input Capacitance (Pin 1 or 19) 10 10 10 pF
C
out
Maximum Three−State I/O Capacitance, (I/O in High−Impedance State) 15 15 15 pF
C
PD
Power Dissipation Capacitance (Per Enabled Output)*
Typical @ 25°C, V
CC
= 5.0 V
pF
97
* Used to determine the no−load dynamic power consumption: P
D
= C
PD
V
CC
2
f + I
CC
V
CC
.
P1-P3P4-P6P7-P9

MC74HCT245ADTG

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Manufacturer:
ON Semiconductor
Description:
Bus Transceivers 5V Octal 3-State Non-Inverting Bus
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