Revised April 2005
74VHCT541A
Octal Buffer/Line Driver with 3-STATE Outputs
General Description
The VHCT541A is an advanced high-speed CMOS device
fabricated with silicon gate CMOS technology. It achieves
the high-speed operation similar to equivalent Bipolar
Schottky TTL while maintaining the CMOS low power dissipation.
The VHCT541A is an octal buffer/line driver designed to be
employed as memory and address drivers, clock drivers
and bus oriented transmitter/receivers.
This device is similar in function to the VHCT244A while
providing flow-through architecture (inputs on opposite side
from outputs). This pinout arrangement makes this device
especially useful as an output port for microprocessors,
allowing ease of layout and greater PC board density.
Protection circuits ensure that 0V to 7V can be applied to
the input and output (Note 1) pins without regard to the
supply voltage. This device can be used to interface 3V to
5V systems and two supply systems such as battery
backup. This circuit prevents device destruction due to mismatched supply and input voltages.
Note 1: Outputs in OFF-state.
Features
s High Speed: tPD
5.5 ns (typ) at VCC
s Low power dissipation: ICC
5V
4 PA (max) at TA
25qC
s Power down protection is provided on all inputs and
outputs
s Pin and function compatible with 74HCT541
Ordering Code:
Order Number
Package Number
74VHCT541AM
Package Description
M20B
M20D
74VHCT541ASJ
74VHCT541AMTC
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MTC20
74VHCT541AN
N20A
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Pb-Free package per JEDEC J-STD-020B.
Logic Symbol
Connection Diagram
IEEE/IEC
Truth Table
Inputs
Pin Descriptions
OE1
Outputs
OE2
I
Pin Names
Description
L
L
H
OE1, OE2
3-STATE Output Enable Inputs
H
X
X
Z
I0 - I7
Inputs
X
H
X
Z
O0 - O7
3-STATE Outputs
L
L
L
L
H
X
© 2005 Fairchild Semiconductor Corporation
DS500013
HIGH Voltage Level
Immaterial
H
L LOW Voltage Level
Z High Impedance
www.fairchildsemi.com
74VHCT541A Octal Buffer/Line Driver with 3-STATE Outputs
June 1997
74VHCT541A
Noise Characteristics
Symbol
TA
25qC
VCC
(V)
Parameter
Typ
Limits
Units
Conditions
VOLP
(Note 7)
Quiet Output Maximum Dynamic VOL
5.0
1.2
1.6
V
CL
50 pF
VOLV
(Note 7)
Quiet Output Minimum Dynamic VOL
5.0
1.2
1.6
V
CL
50 pF
VIHD
(Note 7)
Minimum HIGH Level Dynamic Input Voltage
5.0
2.0
V
CL
50 pF
VILD
(Note 7)
Maximum HIGH Level Dynamic Input Voltage
5.0
0.8
V
CL
50 pF
Note 7: Parameter guaranteed by design.
AC Electrical Characteristics
Symbol
Parameter
tPLH
Propagation Delay
tPHL
3-STATE Output
tPZH
3-STATE Output
tPHZ
Output to Output Skew
25qC
Typ
TA
Max
40qC to 85qC
Min
Max
Units
5.0 r 0.5
6.9
1.0
8.0
7.9
1.0
9.0
8.3
11.3
1.0
13.0
8.8
5.0 r 0.5
5.0
5.5
12.3
1.0
14.0
9.4
11.9
1.0
13.5
ns
1.0
1.0
ns
10
10
Conditions
Disable Time
tOSLH
5.0 r 0.5
Enable Time
tPLZ
TA
Min
Time
tPZL
VCC
(V)
5.0 r 0.5
ns
RL
50 pF
1 k: CL
15 pF
CL
RL
15 pF
CL
ns
CL
50 pF
1 k: CL
50 pF
(Note 8)
CL
50 pF
tOSHL
CIN
Input Capacitance
4
pF
VCC
Open
COUT
Output Capacitance
9
pF
VCC
5.0V
CPD
Power Dissipation Capacitance
19
pF
(Note 9)
Note 8: Parameter guaranteed by design. tOSLH
|tPLHmax t PLHmin|; tOSHL
|tPHLmax tPHLmin|.
Note 9: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average
operating current can be obtained by the equation: ICC (OPR.) CPD * VCC * fIN ICC/8 (per bit).
3
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