74HCT688DB,112 [NXP]
74HC(T)688 - 8-bit magnitude comparator SSOP2 20-Pin;型号: | 74HCT688DB,112 |
厂家: | NXP |
描述: | 74HC(T)688 - 8-bit magnitude comparator SSOP2 20-Pin 光电二极管 逻辑集成电路 |
文件: | 总8页 (文件大小:162K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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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/HCT688
8-bit magnitude comparator
December 1990
Product specification
File under Integrated Circuits, IC06
Philips Semiconductors
Product specification
8-bit magnitude comparator
74HC/HCT688
FEATURES
GENERAL DESCRIPTION
• Compare two 8-bit words
• Output capability: standard
• ICC category: MSI
The 74HC/HCT688 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/HCT688 are 8-bit magnitude comparators.
They perform comparison of two 8-bit binary or BCD
words.
The output provides P = Q.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
TYPICAL
SYMBOL
PARAMETER
CONDITIONS
UNIT
HC
HCT
tPHL/ tPLH
propagation delay
Pn, Qn to P = Q
E to P = Q
CL = 15 pF; VCC = 5 V
17
8
17
12
3.5
30
ns
ns
pF
pF
CI
input capacitance
3.5
30
CPD
power dissipation capacitance per package notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
2
PD = CPD × VCC2 × fi + ∑ (CL × VCC × 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
8-bit magnitude comparator
74HC/HCT688
PIN DESCRIPTION
PIN NO.
SYMBOL
NAME AND FUNCTION
1
E
enable input (active LOW)
word inputs
2, 4, 6, 8, 11, 13, 15, 17
P0 to P7
Q0 to Q7
GND
P = Q
VCC
3, 5, 7, 9, 12, 14, 16, 18
word inputs
10
19
20
ground (0 V)
equal to output
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
3
Philips Semiconductors
Product specification
8-bit magnitude comparator
74HC/HCT688
Fig.4 Functional diagram.
Fig.5 Logic diagram.
FUNCTION TABLE
INPUTS
OUTPUT
P = Q
DATA Pn, Qn
ENABLE E
P = Q
X
P > Q
P < Q
L
H
L
L
H
H
H
L
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
December 1990
4
Philips Semiconductors
Product specification
8-bit magnitude comparator
74HC/HCT688
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
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.
tPHL/ tPLH propagation delay
Pn, Qn to P = Q
55
20
16
170
34
29
215
43
37
255
51
43
2.0
4.5
6.0
Fig.6
ns
ns
ns
t
t
PHL/ tPLH propagation delay
E to P = Q
28
10
8
120
24
20
150
30
26
180
36
31
2.0
4.5
6.0
Fig.7
THL/ tTLH output transition time
19
7
6
75
15
13
95
19
16
110
22
19
2.0
4.5
6.0
Figs 6 and 7
December 1990
5
Philips Semiconductors
Product specification
8-bit magnitude comparator
74HC/HCT688
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
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
Pn
Qn
E
0.35
0.35
0.70
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.
tPHL/ tPLH propagation delay
Pn, Qn to P = Q
20
18
7
34
24
15
43
30
19
51
36
22
ns
ns
ns
4.5 Fig.6
tPHL/ tPLH propagation delay
E to P = Q
4.5 Fig.7
t
THL/ tTLH output transition time
4.5 Figs 6 and 7
December 1990
6
Philips Semiconductors
Product specification
8-bit magnitude comparator
74HC/HCT688
AC WAVEFORMS
(1) HC : VM = 50%; VI = GND to VCC
.
(1) HC : VM = 50%; VI = GND to VCC
.
HCT: VM = 1.3 V; VI = GND to 3 V.
HCT: VM = 1.3 V; VI = GND to 3 V.
Fig.7 Waveforms showing the word inputs (Pn, Qn)
to the equal to output (P = Q) propagation
delays and the output transition times.
Fig.6 Waveforms showing the enable input (E) to
the equal to output (P = Q) propagation
delays and the output transition times.
APPLICATION INFORMATION
Two or more “688” 8-bit magnitude comparators may be cascaded to compare binary or BCD numbers of more than 8
bits. An example is shown in Fig.8.
Fig.8 Binary or BCD comparator.
PACKAGE OUTLINES
See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.
December 1990
7
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