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74VHCT240ATTR

P1-P3P4-P6P7-P9P10-P12
1/12December 2004
■ HIGH SPEED: t
PD
= 5.4 ns (TYP.) at V
CC
= 5V
■ LOW POWER DISSIPATION:
I
CC
= 4 µA (MAX.) at T
A
=25°C
■ COMPATIBLE WITH TTL OUTPUTS:
V
IH
= 2V (MIN.), V
IL
= 0.8V (MAX)
■ POWER DOWN PROTECTION ON INPUTS
& OUTPUTS
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 8 mA (MIN)
■ BALANCED PROPAGATION DELAYS:
t
PLH
≅ t
PHL
■ OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 4.5V to 5.5V
■ PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 240
■ IMPROVED LATCH-UP IMMUNITY
■ LOW NOISE: V
OLP
= 0.9V (MAX.)
DESCRIPTION
The 74VHCT240A is an advanced high-speed
CMOS OCTAL BUS BUFFER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C
2
MOS technology.
G
enable input governs four BUS BUFFERs.
This device is designed to be used with 3 state
memory address drivers, etc.
Power down protection is provided on all inputs
and outputs and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 5V to 3V since all
inputs are equipped with TTL threshold.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
74VHCT240A
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (INVERTED)
Figure 1: Pin Connection And IEC Logic Symbols
Table 1: Order Codes
PACKAGE T & R
SOP 74VHCT240AMTR
TSSOP 74VHCT240ATTR
TSSOPSOP
Rev. 4
Obsolete Product(s) - Obsolete Product(s)
74VHCT240A
2/12
Figure 2: Input Equivalent Circuit Table 2: Pin Description
Table 3: Truth Table
X: Don‘t Care
Z: High Impedance
Table 4: 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
1) Output in OFF State
2) High or Low State
PIN N° SYMBOL NAME AND FUNCTION
11G
Output Enable Input
2, 4, 6, 8 1A1 to 1A4 Data Inputs
9, 7, 5, 3 2Y1
to 2Y4 Data Outputs
11, 13, 15,
17
2A1 to 2A4 Data Inputs
18, 16, 14,
12
1Y1
to 1Y4 Data Outputs
19 2G
Output Enable Input
10 GND Ground (0V)
20 V
CC
Positive Supply Voltage
INPUTS OUTPUT
G
An Yn
LLH
LHL
HXZ
Symbol Parameter Value Unit
V
CC
Supply Voltage
-0.5 to +7.0 V
V
I
DC Input Voltage
-0.5 to +7.0 V
V
O
DC Output Voltage (see note 1)
-0.5 to +7.0 V
V
O
DC Output Voltage (see note 2) -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
± 25 mA
I
CC
or I
GND
DC V
CC
or Ground Current
± 50 mA
T
stg
Storage Temperature
-65 to +150 °C
T
L
Lead Temperature (10 sec)
300 °C
Obsolete Product(s) - Obsolete Product(s)
74VHCT240A
3/12
Table 5: Recommended Operating Conditions
1) Output in OFF State
2) High or Low State
3) VIN from 0.8V to 2V
Table 6: DC Specifications
Table 7: AC Electrical Characteristics (Input t
r
= t
f
= 3ns)
(*) Voltage range is 5.0V ± 0.5V
Symbol Parameter Value Unit
V
CC
Supply Voltage
4.5 to 5.5 V
V
I
Input Voltage
0 to 5.5 V
V
O
Output Voltage (see note 1)
0 to 5.5 V
V
O
Output Voltage (see note 2) 0 to V
CC
V
T
op
Operating Temperature
-55 to 125 °C
dt/dv
Input Rise and Fall Time (see note 3) (V
CC
= 5.0 ± 0.5V)
0 to 20 ns/V
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
222V
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
=-50 µA
4.4 4.5 4.4 4.4
V
4.5
I
O
=-8 mA
3.94 3.8 3.7
V
OL
Low Level Output
Voltage
4.5
I
O
=50 µA
0.0 0.1 0.1 0.1
V
4.5
I
O
=8 mA
0.36 0.44 0.55
I
OZ
High Impedance
Output Leakage
Current
4.5 to
5.5
V
I
= V
IH
or V
IL
V
O
= 0V to 5.5V
±0.25 ± 2.5 ± 2.5 µA
I
I
Input Leakage
Current
0 to
5.5
V
I
= 5.5V or GND
± 0.1 ± 1.0 ± 1.0 µA
I
CC
Quiescent Supply
Current
5.5
V
I
= V
CC
or GND
44040µA
+I
CC
Additional Worst
Case Supply
Current
5.5
One Input at 3.4V,
other input at V
CC
or GND
1.35 1.5 1.5 mA
I
OPD
Output Leakage
Current
0
V
OUT
= 5.5V
0.5 5.0 5.0 µA
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
PLH
t
PHL
Propagation Delay
Time
5.0 15 5.4 7.4 1.0 8.5 1.0 8.5
ns
5.0 50 5.9 8.4 1.0 9.5 1.0 9.5
t
PLZ
t
PHZ
Output Disable
Time
5.0 15
RL = 1KΩ
8.3 10.4 1.0 12.0 1.0 12.0
ns
5.0 50 8.8 11.4 1.0 13.0 1.0 13.0
t
PZL
t
PZH
Output Enable
Time
5.0 50 RL = 1KΩ 8.2 11.4 1.0 13.0 1.0 13.0 ns
Obsolete Product(s) - Obsolete Product(s)
P1-P3P4-P6P7-P9P10-P12

74VHCT240ATTR

Mfr. #:
Buy 74VHCT240ATTR
Manufacturer:
STMicroelectronics
Description:
Buffers & Line Drivers Octal Bus Buffer
Lifecycle:
New from this manufacturer.
Delivery:
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