74HC7540DB,118 [NXP]
74HC(T)7540 - Octal Schmitt trigger buffer/line driver; 3-state; inverting SSOP2 20-Pin;
| 型号： | 74HC7540DB,118 |
| 厂家： | 
NXP |
| 描述： | 74HC(T)7540 - Octal Schmitt trigger buffer/line driver; 3-state; inverting SSOP2 20-Pin 驱动 光电二极管 输出元件 逻辑集成电路 |
| 文件： | 总7页 (文件大小：51K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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/HCT7540
Octal Schmitt trigger buffer/line
driver; 3-state; inverting
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; inverting
74HC/HCT7540
The 74HC/HCT7540 are octal Schmitt trigger inverting
buffer/line drivers with 3-state outputs. The 3-state outputs
are controlled by the output enable inputs OE1 and OE2.
FEATURES
• 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/HCT7540 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 “7540” is identical to the “540” 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
ns
HC
HCT
tPHL/ tPLH propagation delay An to Yn
CL = 15 pF; VCC = 5 V
11
16
3.5
31
CI
input capacitance
3.5
29
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; inverting
74HC/HCT7540
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.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
3
Philips Semiconductors
Product specification
Octal Schmitt trigger buffer/line driver;
3-state; inverting
74HC/HCT7540
FUNCTION TABLE
INPUTS
OE2
OUTPUTS
Yn
OE1
An
L
L
X
H
L
L
H
X
L
H
X
X
H
L
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; inverting
74HC/HCT7540
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
31
ns
ns
ns
ns
2.0 Fig.8
4.5
6.0
t
t
t
PZH/ tPZL 3-state output enable
41
15
12
150
30
26
190
38
33
225
45
38
2.0 Fig.9
4.5
6.0
time
OEn to Yn
PHZ/ tPLZ 3-state output disable
52
19
15
150
30
26
190
38
33
225
45
38
2.0 Fig.9
4.5
6.0
time
OEn to Yn
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)
74HC
TEST CONDITIONS
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; inverting
74HC/HCT7540
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
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
19
19
20
5
32
32
32
12
40
40
40
15
48
48
48
18
ns
ns
ns
ns
4.5 Fig.8
4.5 Fig.9
4.5 Fig.9
4.5 Fig.8
An to Yn
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
TRANSFER CHARACTERISTICS FOR 74HCT
Voltages are referred to GND (ground = 0 V)
Tamb (°C)
74HCT
−40 to +85 −40 to +125
TEST CONDITIONS
SYMBOL PARAMETER
UNIT
VCC
+25
WAVEFORMS
(V)
min typ. max. min max. min. max.
VT+
VT−
VH
positive-going threshold
negative-going threshold
hysteresis (VT+ − VT−)
2.0
2.1
2.0
2.1
2.0
2.1
V
V
V
4.5 Figs 6 and 7
5.5
0.70
0.80
0.64
0.74
0.60
0.70
4.5 Figs 6 and 7
5.5
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; inverting
74HC/HCT7540
TRANSFER CHARACTERISTIC WAVEFORMS
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
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