®
74VHCT541A
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (NON INVERTED)
s
s
s
s
s
s
s
s
s
s
HIGH SPEED: t
PD
= 3.6 ns (TYP.) at V
CC
= 5V
LOW POWER DISSIPATION:
I
CC
= 4
µA
(MAX.) at T
A
= 25
o
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 541
IMPROVED LATCH-UP IMMUNITY
LOW NOISE: V
OLP
= 0.9V (Max.)
M
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74VHCT541AM
74VHCT41AT
input AND such that if either G1 and G2 are high,
all eight outputs are in the high impedance state.
In order to enhance PC board layout, the AC541
offers a pinout having inputs and outputs on
opposite sides of the package.
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.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
DESCRIPTION
The VHCT541A 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.
The 3 STATE control gate operates as a two
PIN CONNECTION AND IEC LOGIC SYMBOLS
August 1999
1/8
74VHCT541A
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1,19
2, 3, 4,5,
6, 7,8, 9
18, 17, 16,
15, 14, 13,
12, 11
10
20
SYMBOL
G1, G2
A1 to A8
Y1 to Y8
NAME AND FUNCT ION
Output Enable Input
Data Inputs
Data Outputs
GND
V
CC
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUT
G1
H
X
L
L
X:”H” or ”L”
Z: High impedance
O UT PUT
An
X
X
H
L
Yn
Z
Z
H
L
G2
X
H
L
L
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
V
O
I
IK
I
OK
I
O
I
CC
orI
GND
T
stg
T
L
Supply Voltage
DC Input Voltage
DC Output Voltage (see note 1)
DC Output Voltage (see note 2)
DC Input Diode Current
DC Output Diode Current
DC Output Current
DC V
CC
or Ground Current
Storage Temperature
Lead Temperature (10 sec)
Parameter
Value
-0.5 to +7.0
-0.5 to +7.0
-0.5 to +7.0
-0.5 to V
CC
+ 0.5
- 20
±
20
±
25
±
50
-65 to +150
300
Unit
V
V
V
V
mA
mA
mA
mA
o
o
C
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
1) Output in OFF State
2) High or Low State
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
V
O
T
op
dt/dv
Supply Voltage
Input Voltage
Output Voltage (see note 1)
Output Voltage (see note 2)
Operating Temperature
Input Rise and Fall Time (see note 3) (V
CC
= 5.0
±
0.5V)
Parameter
Valu e
4.5 to 5.5
0 to 5.5
0 to 5.5
0 to V
CC
-40 to +85
0 to 20
Unit
V
V
V
V
o
C
ns/V
1) Output in OFF State
2) High or Low State
3)V
IN
from0.8V to 2 V
2/8
74VHCT541A
CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
T est Cond ition s
o
Value
T
A
= 25 C
Min.
Typ .
4
9
19
Max.
10
-40 to 85 C
Min .
Max.
10
o
Un it
C
IN
C
OUT
C
PD
Input Capacitance
Output Capacitance
Power Dissipation
Capacitance (note 1)
pF
pF
pF
1) C
PD
isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto
Test Circuit).Average operating current can be obtained by the following equation. I
CC
(opr) = C
PD
•
V
CC
•
f
IN
+ I
CC
/8 (per Circuit)
DYNAMIC SWITCHING CHARACTERISTICS
Symb ol
Parameter
T est Cond ition s
V
CC
(V)
V
OLP
V
OLV
V
IHD
V
ILD
Dynamic Low Voltage
Quiet Output (note 1, 2)
Dynamic High Voltage
Input (note 1, 3)
Dynamic Low Voltage
Input (note 1, 3)
5.0
-1.1
5.0
5.0
C
L
= 50 pF
2.0
0.8
o
Value
T
A
= 25 C
Min.
Typ .
0.9
-0.9
Max.
1.1
-40 to 85 C
Min .
Max.
o
Un it
V
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n -1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to5.0V. Inputs under test switching: 5.0V to threshold (V
ILD
), 0V to threshold (V
IHD
), f=1MHz.
TEST CIRCUIT
T EST
t
PLH
, t
PHL
t
PZL
, t
PLZ
t
PZH
, t
PHZ
C
L
= 15/50 pF or equivalent (includes jig and probe capacitance)
R
L
= R
1
= 1KΩ orequivalent
R
T
= Z
OUT
of pulse generator (typically 50Ω)
SW IT CH
Open
V
CC
GND
4/8
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