Datasheet

December 1990 2
Philips Semiconductors Product specification
Octal Schmitt trigger buffer/line driver; 3-state 74HC/HCT7541
FEATURES
• Non-inverting outputs
• Schmitt trigger action on all data inputs
• Output capability: bus driver
• I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT7541 are high-speed Si-gate CMOS
devices and are pin compatible with low power Schottky
TTL (LSTTL). They are specified in compliance with
JEDEC standard no. 7A.
The 74HC/HCT7541 are octal Schmitt trigger
non-inverting buffer/line drivers with 3-state outputs. The
3-state outputs are controlled by the output enable inputs
OE
1
and OE
2
.
A HIGH on OE
n
causes the outputs to assume a high
impedance OFF-state.
The Schmitt trigger action in the data inputs transforms
slowly changing input signals into sharply defined
jitter-free output signals.
The “7541” is identical to the “541” but has hysteresis on
the data inputs.
QUICK REFERENCE DATA
GND = 0 V; T
amb
=25°C; t
r
=t
f
= 6 ns
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in µW):
P
D
=C
PD
× V
CC
2
× f
i
+∑(C
L
× V
CC
2
× f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑ (C
L
× V
CC
2
× f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
− 1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information” .
SYMBOL PARAMETER CONDITIONS
TYPICAL
UNIT
HC HCT
t
PHL
/ t
PLH
propagation delay A
n
to Y
n
C
L
= 15 pF; V
CC
= 5 V 10 16 ns
C
I
input capacitance 3.5 3.5 pF
C
PD
power dissipation capacitance per buffer notes 1 and 2 30 32 pF