HEF4585BN [NXP]
4-bit magnitude comparator; 4位数值比较器
| 型号： | HEF4585BN |
| 厂家： | 
NXP |
| 描述： | 4-bit magnitude comparator |
| 文件： | 总7页 (文件大小：70K) |
| 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 IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC
• The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC
HEF4585B
MSI
4-bit magnitude comparator
January 1995
Product specification
File under Integrated Circuits, IC04
Philips Semiconductors
Product specification
HEF4585B
MSI
4-bit magnitude comparator
For proper compare operation the expander inputs to the
least significant position must be connected as follows:
DESCRIPTION
The HEF4585B is a 4-bit magnitude comparator which
compares two 4-bit words (A and B), whether they are ‘less
than’, ‘equal to’, or ‘greater than’. Each word has four
parallel inputs (A0 to A3 and B0 to B3); A3 and B3 being the
most significant inputs. Three outputs are provided;
A greater than B (OA > B), A less than B (OA < B) and
I
A = B = IA > B = HIGH, IA < B = LOW. For words greater than
4-bits, units can be cascaded by connecting outputs
A < B and OA = B to the corresponding inputs of the next
O
significant comparator (input IA > B is connected to a
HIGH).
Operation is not restricted to binary codes, the devices will
work with any monotonic code. The function table
describes the operation of the device under all possible
logic conditions.
A equal to B (OA = B). Three expander inputs (IA > B
A < B and IA = B) allow cascading of the devices without
external gates.
,
I
Fig.2 Pinning diagram.
HEF4585BP(N):
HEF4585BD(F):
HEF4585BT(D):
16-lead DIL; plastic (SOT38-1)
16-lead DIL; ceramic (cerdip) (SOT74)
16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
PINNING
A0 to A3
B0 to B3
word A parallel inputs
word B parallel inputs
Fig.1 Functional diagram.
IA > B, IA < B, IA = B expander inputs
OA > B
OA < B
OA = B
A greater than B output
A less than B output
A equal to B output
FAMILY DATA, IDD LIMITS category MSI
See Family Specifications
January 1995
2
Philips Semiconductors
Product specification
HEF4585B
MSI
4-bit magnitude comparator
Fig.3 Logic diagram.
January 1995
3
Philips Semiconductors
Product specification
HEF4585B
MSI
4-bit magnitude comparator
FUNCTION TABLE
COMPARING INPUTS
CASCADING INPUTS
OUTPUTS
OA < B
A3, B3
A2, B2
A1, B1
A0, B0
IA > B
IA < B
IA = B
OA > B
OA = B
A3 > B3
A3 < B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
X
X
X
H
X
H
X
H
X
H
X
X
H
X
X
L
X
X
X
X
X
X
X
X
L
X
X
X
X
X
X
X
X
H
L
H
L
L
H
L
L
L
L
L
L
L
L
L
H
L
L
H
L
X
X
X
A2 > B2
A2 < B2
A2 = B2
A2 = B2
A2 = B2
A2 = B2
A2 = B2
A2 = B2
A2 = B2
A2 = B2
A2 = B2
X
X
H
L
X
X
H
L
A1 > B1
A1 < B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
X
H
L
X
H
L
A0 > B0
A0 < B0
A0 = B0
A0 = B0
A0 = B0
A0 = B0
A0 = B0
H
L
H
L
L
L
H
L
L
H
H
L
L
H
H
L
H
L
L
L
Notes
1. H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial
The upper 11 lines describe the normal operation under all conditions that will occur in a single device or in a serial
expansion scheme.
The lower 2 lines describe the operation under abnormal conditions on the cascading inputs. These conditions occur
when the parallel expansion technique is used.
January 1995
4
Philips Semiconductors
Product specification
HEF4585B
MSI
4-bit magnitude comparator
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
TYPICAL EXTRAPOLATION
FORMULA
SYMBOL MIN. TYP. MAX.
Propagation delays
An, Bn → On
5
160
65
320 ns
130 ns
90 ns
300 ns
120 ns
90 ns
220 ns
90 ns
60 ns
240 ns
100 ns
70 ns
120 ns
60 ns
40 ns
120 ns
60 ns
40 ns
133 ns + (0,55 ns/pF) CL
54 ns + (0,23 ns/pF) CL
37 ns + (0,16 ns/pF) CL
123 ns + (0,55 ns/pF) CL
49 ns + (0,23 ns/pF) CL
37 ns + (0,16 ns/pF) CL
83 ns + (0,55 ns/pF) CL
34 ns + (0,23 ns/pF) CL
22 ns + (0,16 ns/pF) CL
93 ns + (0,55 ns/pF) CL
39 ns + (0,23 ns/pF) CL
27 ns + (0,16 ns/pF) CL
10 ns + (1,0 ns/pF) CL
9 ns + (0,42 ns/pF) CL
6 ns + (0,28 ns/pF) CL
10 ns + (1,0 ns/pF) CL
9 ns + (0,42 ns/pF) CL
6 ns + (0,28 ns/pF) CL
HIGH to LOW
10
15
5
tPHL
tPLH
tPHL
tPLH
tTHL
tTLH
45
150
60
LOW to HIGH
10
15
5
45
In → On
110
45
HIGH to LOW
10
15
5
30
120
50
LOW to HIGH
10
15
5
35
Output transition times
HIGH to LOW
60
10
15
5
30
20
60
LOW to HIGH
10
15
30
20
VDD
V
TYPICAL FORMULA FOR P (µW)
2
Dynamic power
dissipation per
package (P)
5
10
15
1250 fi + ∑ (foCL) × VDD
where
2
5500 fi + ∑ (foCL) × VDD
fi = input freq. (MHz)
2
15 000 fi + ∑ (foCL) × VDD
fo = output freq. (MHz)
CL = load capacitance (pF)
∑ (foCL) = sum of outputs
VDD = supply voltage (V)
APPLICATION INFORMATION
Some examples of applications for the HEF4585B are:
• Process controllers.
• Servo-motor control.
January 1995
5
Philips Semiconductors
Product specification
HEF4585B
MSI
4-bit magnitude comparator
Fig.4 Example of cascading comparators.
January 1995
6
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