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M74HCT245TTR

P1-P3P4-P6P7-P9
1/9August 2001
■ HIGH SPEED:
t
PD
= 13ns (TYP.) at V
CC
= 4.5V
■ LOW POWER DISSIPATION:
I
CC
= 4µA(MAX.) at T
A
=25°C
■ COMPATIBLE WITH TTL OUTPUTS :
V
IH
= 2V (MIN.) V
IL
= 0.8V (MAX)
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 6mA (MIN)
■ BALANCED PROPAGATION DELAYS:
t
PLH
≅ t
PHL
■ PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 245
DESCRIPTION
The M74HCT245 is an advanced high-speed
CMOS OCTAL BUS TRANSCEIVER (3-STATE)
fabricated with silicon gate C
2
MOS technology.
This IC is intended for two-way asynchronous
communication between data buses, and the
direction of data transmission is determined by
DIR input. The enable input G
can be used to
disable the device so that the buses are effectively
isolated.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
All floating bus terminals during High Z State must
be held HIGH or LOW.
M74HCT245
OCTAL BUS TRANSCEIVER
WITH 3 STATE OUTPUTS (NON INVERTED)
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE TUBE T & R
DIP M74HCT245B1R
SOP M74HCT245M1R M74HCT245RM13TR
TSSOP M74HCT245TTR
TSSOPDIP SOP
M74HCT245
2/9
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
Z : High Impedance
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65
°C
; derate to 300mW by 10mW/
°C
from 65
°C to 85°C
RECOMMENDED OPERATING CONDITIONS
PIN No SYMBOL NAME AND FUNCTION
1 DIR Directional Control
2, 3, 4, 5, 6,
7, 8, 9
A1 to A8 Data Inputs/Outputs
18, 17, 16,
15, 14, 13,
12, 11
B1 to B8 Data Inputs/Outputs
19 G
Output Enable Input
10 GND Ground (0V)
20 V
CC
Positive Supply Voltage
INPUTS FUNCTION OUTPUT
G
DIR A BUS B BUS Yn
L L OUTPUT INPUT A = B
L H INPUT OUTPUT B = A
HXZZZ
Symbol Parameter Value Unit
V
CC
Supply Voltage
-0.5 to +7 V
V
I
DC Input Voltage -0.5 to V
CC
+ 0.5
V
V
O
DC Output Voltage -0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
± 20 mA
I
OK
DC Output Diode Current
± 20 mA
I
O
DC Output Current
± 35 mA
I
CC
or I
GND
DC V
CC
or Ground Current
± 70 mA
P
D
Power Dissipation
500(*) mW
T
stg
Storage Temperature
-65 to +150 °C
T
L
Lead Temperature (10 sec)
300 °C
Symbol Parameter Value Unit
V
CC
Supply Voltage
4.5 to 5.5 V
V
I
Input Voltage 0 to V
CC
V
V
O
Output Voltage 0 to V
CC
V
T
op
Operating Temperature
-55 to 125 °C
t
r
, t
f
Input Rise and Fall Time (V
CC
= 4.5 to 5.5V)
0 to 500 ns
M74HCT245
3/9
DC SPECIFICATIONS
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, Input t
r
= t
f
= 6ns)
Symbol Parameter
Test Condition Value
Unit
V
CC
(V)
T
A
= 25°C
-40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
V
IH
High Level Input
Voltage
4.5
to
5.5
2.0 2.0 2.0 V
V
IL
Low Level Input
Voltage
4.5
to
5.5
0.8 0.8 0.8 V
V
OH
High Level Output
Voltage
4.5
I
O
=-20 µA
4.4 4.5 4.4 4.4
V
I
O
=-6.0 mA
4.18 4.31 4.13 4.10
V
OL
Low Level Output
Voltage
4.5
I
O
=20 µA
0.0 0.1 0.1 0.1
V
I
O
=6.0 mA
0.17 0.26 0.33 0.40
I
I
Input Leakage
Current
5.5
V
I
= V
CC
or GND
± 0.1 ± 1 ± 1 µA
I
OZ
High Impedance
Output Leakage
Current
5.5
V
I
= V
IH
or V
IL
V
O
= V
CC
or GND
± 0.5 ± 5 ± 10 µA
I
CC
Quiescent Supply
Current
5.5
V
I
= V
CC
or GND
44080µA
∆ I
CC
Additional Worst
Case Supply
Current
5.5 Per Input pin
V
I
= 0.5V or
V
I
= 2.4V
Other Inputs at
V
CC
or GND
I
O
= 0
2.0 2.9 3.0 mA
Symbol Parameter
Test Condition Value
Unit
V
CC
(V)
C
L
(pF)
T
A
= 25°C
-40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
t
TLH
t
THL
Output Transition
Time
4.5 50 7 12 15 18 ns
t
PLH
t
PHL
Propagation Delay
Time
4.5
50 13 22 28 33
ns
150 18 30 38 45
t
PZL
t
PZH
High Impedance
Output Enable
Time
4.5
50
R
L
= 1 KΩ
19 30 38 45
ns
150
R
L
= 1 KΩ
24 38 48 57
t
PLZ
t
PHZ
High Impedance
Output Disable
Time
4.5 50
R
L
= 1 KΩ
17 30 38 45 ns
P1-P3P4-P6P7-P9

M74HCT245TTR

Mfr. #:
Buy M74HCT245TTR
Manufacturer:
STMicroelectronics
Description:
Bus Transceivers Octal Bus Transceivr
Lifecycle:
New from this manufacturer.
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