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INTEGRATED CIRCUITS  
DATA SHEET  
For a complete data sheet, please also download:  
• The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications  
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Information  
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines  
74HC/HCT7541  
Octal Schmitt trigger buffer/line  
driver; 3-state  
December 1990  
Product specification  
Supersedes data of March 1988  
File under Integrated Circuits, IC06  
Philips Semiconductors  
Product specification  
Octal Schmitt trigger buffer/line driver; 3-state  
74HC/HCT7541  
The 74HC/HCT7541 are octal Schmitt trigger  
FEATURES  
non-inverting buffer/line drivers with 3-state outputs. The  
3-state outputs are controlled by the output enable inputs  
OE1 and OE2.  
• Non-inverting outputs  
• Schmitt trigger action on all data inputs  
• Output capability: bus driver  
• ICC category: MSI  
A HIGH on OEn 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.  
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 “7541” is identical to the “541” but has hysteresis on  
the data inputs.  
QUICK REFERENCE DATA  
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns  
TYPICAL  
SYMBOL  
PARAMETER  
CONDITIONS  
UNIT  
HC  
HCT  
tPHL/ tPLH  
CI  
propagation delay An to Yn  
input capacitance  
CL = 15 pF; VCC = 5 V  
10  
3.5  
30  
16  
3.5  
32  
ns  
pF  
pF  
CPD  
power dissipation capacitance per buffer  
notes 1 and 2  
Notes  
1. CPD is used to determine the dynamic power dissipation (PD in µW):  
PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:  
fi = input frequency in MHz  
fo = output frequency in MHz  
∑ (CL × VCC2 × fo) = sum of outputs  
CL = output load capacitance in pF  
VCC = supply voltage in V  
2. For HC the condition is VI = GND to VCC  
For HCT the condition is VI = GND to VCC − 1.5 V  
ORDERING INFORMATION  
See “74HC/HCT/HCU/HCMOS Logic Package Information”.  
December 1990  
2
Philips Semiconductors  
Product specification  
Octal Schmitt trigger buffer/line driver; 3-state  
74HC/HCT7541  
PIN DESCRIPTION  
PIN NO.  
SYMBOL  
NAME AND FUNCTION  
1, 19  
OE1, OE2  
A0 to A7  
GND  
output enable inputs (active LOW)  
data inputs  
2, 3, 4, 5, 6, 7, 8, 9  
10  
ground (0 V)  
18, 17, 16, 15, 14, 13, 12, 11  
20  
Y0 to Y7  
VCC  
bus outputs  
positive supply voltage  
Fig.2 Logic symbol.  
Fig.3 IEC logic symbol.  
Fig.1 Pin configuration.  
December 1990  
3
Philips Semiconductors  
Product specification  
Octal Schmitt trigger buffer/line driver; 3-state  
74HC/HCT7541  
FUNCTION TABLE  
INPUTS  
OE2  
OUTPUTS  
Yn  
OE1  
An  
L
L
X
H
L
L
H
X
L
H
X
X
L
H
Z
Z
Notes  
1. H = HIGH voltage level  
L = LOW voltage level  
X = don’t care  
Z = high impedance OFF-state  
Fig.4 Functional diagram.  
Fig.5 Logic diagram.  
December 1990  
4
Philips Semiconductors  
Product specification  
Octal Schmitt trigger buffer/line driver; 3-state  
74HC/HCT7541  
DC CHARACTERISTICS FOR 74HC  
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.  
Transfer characteristics are given below (not applicable for OEn inputs).  
Output capability: bus driver  
ICC category: MSI  
AC CHARACTERISTICS FOR 74HC  
GND = 0 V; tr = tf = 6 ns; CL = 50 pF  
T
amb (°C)  
TEST CONDITIONS  
74HC  
SYMBOL PARAMETER  
UNIT  
VCC  
(V)  
+25  
−40 to +85 −40 to +125  
WAVEFORMS  
min. typ. max. min. max. min. max.  
tPHL/ tPLH propagation delay  
An to Yn  
39  
14  
11  
120  
24  
20  
150  
30  
26  
180  
36  
32  
ns  
ns  
ns  
ns  
2.0 Fig.8  
4.5  
6.0  
t
t
t
PZH/ tPZL 3-state output enable time  
OEn to Yn  
44  
16  
13  
160  
32  
27  
200  
40  
34  
240  
48  
41  
2.0 Fig.8  
4.5  
6.0  
PHZ/ tPLZ 3-state output disable time  
OEn to Yn  
58  
21  
17  
160  
32  
27  
200  
40  
34  
240  
48  
41  
2.0 Fig.8  
4.5  
6.0  
THL/ tTLH output transition time  
14  
5
4
60  
12  
10  
75  
15  
13  
90  
18  
15  
2.0 Fig.8  
4.5  
6.0  
TRANSFER CHARACTERISTICS FOR 74HC  
Voltages are referred to GND (ground = 0 V)  
Tamb (°C)  
TEST CONDITIONS  
74HC  
SYMBOL PARAMETER  
UNIT  
VCC  
(V)  
+25  
−40 to +85 −40 to +125  
WAVEFORMS  
min. typ. max. min. max. min. max.  
VT+  
VT−  
VH  
positive-going threshold  
1.50  
3.15  
4.20  
1.50  
3.15  
4.20  
1.50  
3.15  
4.20  
V
V
V
2.0 Figs 6 and 7  
4.5  
6.0  
negative-going threshold 0.30  
0.30  
1.35  
1.80  
0.30  
1.35  
1.80  
2.0 Figs 6 and 7  
4.5  
6.0  
1.35  
1.80  
hysteresis (VT+ − VT−)  
0.10 0.20  
0.25 0.40  
0.30 0.50  
0.10  
0.25  
0.30  
0.10  
0.25  
0.30  
2.0 Figs 6 and 7  
4.5  
6.0  
December 1990  
5
Philips Semiconductors  
Product specification  
Octal Schmitt trigger buffer/line driver; 3-state  
74HC/HCT7541  
DC CHARACTERISTICS FOR 74HCT  
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.  
Transfer characteristics are given below (not applicable for OEn inputs).  
Output capability: bus driver  
ICC category: MSI  
Note to HCT types  
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.  
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.  
INPUT  
UNIT LOAD COEFFICIENT  
OE1  
OE2  
An  
1.30  
1.30  
0.20  
AC CHARACTERISTICS FOR 74HCT  
GND = 0 V; tr = tf = 6 ns; CL = 50 pF  
Tamb (°C)  
TEST CONDITIONS  
74HCT  
SYMBOL PARAMETER  
UNIT  
VCC  
+25  
−40 to +85 −40 to +125  
WAVEFORMS  
(V)  
min typ. max min. max min. max.  
t
t
t
PHL/ tPLH propagation delay  
An to Yn  
19 32  
18 32  
20 32  
40  
40  
40  
15  
48  
48  
48  
18  
ns  
ns  
ns  
ns  
4.5 Fig.8  
4.5 Fig.8  
4.5 Fig.8  
4.5 Fig.8  
PZH/ tPZL 3-state output enable time  
OEn to Yn  
PHZ/ tPLZ 3-state output disable time  
OEn to Yn  
tTHL/ tTLH output transition time  
5
12  
TRANSFER CHARACTERISTICS FOR 74HCT  
Voltages are referred to GND (ground = 0 V)  
Tamb (°C)  
74HCT  
−40 to +85 −40 to +125  
min. typ. max. min. max. min. max.  
TEST CONDITIONS  
SYMBOL PARAMETER  
UNIT  
VCC  
+25  
WAVEFORMS  
(V)  
VT+  
VT−  
VH  
positive-going threshold  
2.0  
2.1  
2.0  
2.1  
2.0  
2.1  
V
V
V
4.5 Figs 6 and 7  
5.5  
negative-going threshold 0.70  
0.80  
0.64  
0.74  
0.60  
0.70  
4.5 Figs 6 and 7  
5.5  
hysteresis (VT+ − VT−)  
0.17 0.23  
0.17 0.23  
4.5 Figs 6 and 7  
5.5  
December 1990  
6
Philips Semiconductors  
Product specification  
Octal Schmitt trigger buffer/line driver; 3-state  
74HC/HCT7541  
TRANSFER CHARACTERISTIC WAVEFORMS  
MBA325  
handbook, halfpage  
V
O
V
V
I
H
V
V
T
T
Fig.7 Waveforms showing the definition of VT+,  
VT− and VH.  
Fig.6 Transfer characteristic.  
AC WAVEFORMS  
(1) HC : VM = 50%; VI = GND to VCC  
.
HCT: VM = 1.3 V; VI = GND to 3 V.  
Fig.8 Waveforms showing the input (An) to output (Yn) propagation delays and the output transition times.  
(1) HC : VM = 50%; VI = GND to VCC  
.
HCT: VM = 1.3 V; VI = GND to 3 V.  
Fig.9 Waveforms showing the 3-state enable and disable times.  
PACKAGE OUTLINES  
See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.  
December 1990  
7