HD74LS85 [RENESAS]
4-bit Magnitude Comparator; 4位数值比较器
| 型号： | HD74LS85 |
| 厂家： | 
RENESAS TECHNOLOGY CORP |
| 描述： | 4-bit Magnitude Comparator |
| 文件： | 总7页 (文件大小：82K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HD74LS85
4-bit Magnitude Comparator
REJ03D0421–0200
Rev.2.00
Feb.18.2005
This four bit magnitude comparator performs comparison of straight binary and straight BCD (8-4-2-1) codes. Three
fully decoded decisions about two 4-bit words (A, B) are made and are externally available at three outputs. This
device is fully expandable to any number of bits without external gates. Words of greater length may be compared by
connecting comparators in cascade. The A > B, A < B, and A = B outputs of a stage handling less-significant bits. The
stage handling the least- significant bits must have a high-level voltage applied to the A β B input. The cascading path
is implemented with only a two-gate-level delay to reduce overall comparison times for long words.
Features
•
Ordering Information
Package Code
(Previous Code)
Package
Abbreviation
Taping Abbreviation
(Quantity)
Part Name
Package Type
DILP-16 pin
PRDP0016AE-B
(DP-16FV)
HD74LS85P
HD74LS85FPEL
P
—
PRSP0016DH-B
(FP-16DAV)
SOP-16 pin (JEITA)
FP
EL (2,000 pcs/reel)
Note: Please consult the sales office for the above package availability.
Pin Arrangement
B
3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
Data Input
B
3
A<B
A=B
A>B
A
B
A
3
2
2
A
B
A
A
B
A
B
3
2
2
1
1
0
0
A<B
In
Cascade
A=B
A>B
A>B
A=B
A<B
GND
Inputs
A>B
A
1
Data Inputs
Out
A=B
A<B
B
A
1
0
Outputs
B
0
(Top view)
Rev.2.00, Feb.18.2005, page 1 of 6
HD74LS85
Function Table
Inputs
A1, B1
Cascading Inputs
Outputs
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
A3 = B3
A2, B2
X
A0, B0
X
A > B
X
A < B
X
A = B
X
A > B
A < B
A = B
X
H
L
L
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
X
X
X
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
X
X
X
H
L
X
X
X
X
X
H
L
A1 > B1
A1 < B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
A1 = B1
X
X
X
X
H
L
X
X
X
X
H
L
A0 > B0
A0 < B0
A0 = B0
A0 = B0
A0 = B0
A0 = B0
A0 = B0
X
X
X
H
L
X
X
X
H
L
H
L
L
H
L
L
H
L
H
L
X
X
H
L
L
H
H
L
L
L
L
L
H
H
H; high level, L; low level, X; irrelevant
Block Diagram
A
B
3
3
A > B
A
B
2
2
A < B
A = B
A > B
A = B
A < B
A
1
1
B
A
B
0
0
Absolute Maximum Ratings
Item
Supply voltage
Symbol
VCC
Ratings
Unit
7
7
V
V
Input voltage
VIN
Power dissipation
Storage temperature
PT
400
mW
°C
Tstg
–65 to +150
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Rev.2.00, Feb.18.2005, page 2 of 6
HD74LS85
Recommended Operating Conditions
Item
Symbol
VCC
Min
4.75
—
Typ
5.00
—
Max
5.25
–400
8
Unit
V
Supply voltage
Output current
IOH
µA
mA
°C
IOL
—
—
Operating temperature
Topr
–20
25
75
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Input voltage
Symbol
VIH
min.
2.0
—
typ.*
—
max.
Unit
Condition
—
V
V
VIL
—
0.8
VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V,
IOH = –400 µA
VOH
VOL
2.7
—
—
V
V
Output voltage
—
—
—
—
0.4
0.5
IOL = 4 mA
IOL = 8 mA
V
CC = 4.75 V, VIH = 2 V,
VIL = 0.8 V
A < B, A > B
inputs
—
—
—
—
—
—
—
—
—
20
60
IIH
µA
VCC = 5.25 V, VI = 2.7 V
VCC = 5.25 V, VI = 0.4 V
Other inputs
A < B, A > B
inputs
—
–0.4
–1.2
0.1
Input
current
IIL
mA
Other inputs
—
A < B, A > B
inputs
—
II
mA
mA
VCC = 5.25 V, VI = 7 V
VCC = 5.25 V
Other inputs
—
0.3
Short-circuit output
current
IOS
–20
–100
Supply current**
ICC
VIK
—
—
10.4
—
20
mA
V
VCC = 5.25 V
Input clamp voltage
–1.5
VCC = 4.75 V, IIN = –18 mA
Note: * VCC = 5 V, Ta = 25°C
** ICC is measured with outputs open, A = B grounded, and all other inputs at 4.5 V.
Switching Characteristics
(VCC = 5 V, Ta = 25°C)
Item
Symbol
Inputs
Outputs
Number of
gate levels
min.
typ.
max.
Unit
Condition
1
2
3
4
1
2
3
4
1
1
2
2
1
1
—
—
—
—
—
—
—
—
—
—
—
—
—
—
14
19
24
27
11
15
20
23
14
11
13
13
14
11
—
—
36
45
—
—
30
45
22
17
20
26
22
17
A < B, A > B
A = B
Any A or
B data input
tPLH
A < B, A > B
Any A or
B data input
tPHL
Propagation
delay time
CL = 15 pF,
RL = 2 kΩ
ns
A = B
A > B
tPHL
tPHL
tPLH
tPHL
tPLH
tPHL
A < B or
A = B
A = B
A = B
A < B
A > B or
A = B
Rev.2.00, Feb.18.2005, page 3 of 6
HD74LS85
Testing Method
Test Circuit
VCC
Output
4.5V
Input
Load circuit 1
RL
A
B
A
B
A
B
A
B
3
3
2
2
1
1
0
0
A>B
C
L
P.G.
out = 50Ω
Z
Output
Same as Load Circuit 1.
Same as Load Circuit 1.
A=B
A<B
Output
A<B
A=B
A>B
Notes:
1. CL includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Waveform
tTLH
tTHL
3 V
0 V
90%
1.3 V
90%
1.3 V
Input
10%
10%
tPHL
tPLH
VOH
In phase output
(A)
1.3 V
1.3 V
VOL
tPHL
tPLH
VOH
1.3 V
1.3 V
Out of phase output
(B)
VOL
Note: Input pulse; tTLH ≤ 15 ns, tTHL ≤ 6 ns, PRR = 1 MHz, duty cycle = 50%
Rev.2.00, Feb.18.2005, page 4 of 6
HD74LS85
Testing Table
Inputs
B1
Output waveforms
Item
A3
B3
A2
B2
A1
A0
B0
A > B A = B A < B A > B A = B A < B
IN
4.5 v 4.5 v GND GND GND GND GND GND
IN GND 4.5 v GND GND GND GND GND
IN 4.5 v 4.5 v GND GND GND GND
GND GND 4.5 v IN GND 4.5 v GND GND GND
GND GND GND GND IN 4.5 v 4.5 v GND GND
GND GND GND GND 4.5 v IN GND 4.5 v GND
GND GND GND GND GND GND IN 4.5 v 4.5 v
GND GND GND GND GND GND 4.5 v IN GND
GND GND GND GND GND GND IN 4.5 v GND
GND GND GND GND GND GND 4.5 v
GND GND GND GND GND GND GND GND
GND
GND
GND
GND
GND
GND
GND
GND
4.5 v
4.5 v
GND
IN
GND
GND
GND
GND
GND
GND
GND
4.5 v
GND
GND
GND
GND
IN
A
B
A
B
A
B
A
B
—
B
—
B
B
—
—
—
—
—
—
—
—
A
B
A
B
A
B
A
B
A
B
—
B
B
—
4.5 v
GND GND
tPLH
tPHL
IN
GND
IN
A
—
A
GND GND GND GND GND GND GND GND GND
GND GND GND GND GND GND GND GND GND
GND
—
Rev.2.00, Feb.18.2005, page 5 of 6
HD74LS85
Package Dimensions
JEITA Package Code
P-DIP16-6.3x19.2-2.54
RENESAS Code
PRDP0016AE-B
Previous Code
DP-16FV
MASS[Typ.]
1.05g
D
16
9
1
8
b 3
0.89
Z
Dimension in Millimeters
Reference
Symbol
Min
Nom
7.62
19.2
6.3
Max
e
1
D
20.32
7.4
E
A
5.06
A 1
0.51
0.40
b
0.48
1.30
0.25
0.56
p
bp
e
c
b
3
c
θ
0.19
0.31
e 1
0
°
15°
e
Z
L
2.29
2.54
2.54
2.79
1.12
( Ni/Pd/Au plating )
JEITA Package Code
P-SOP16-5.5x10.06-1.27
RENESAS Code
PRSP0016DH-B
Previous Code
FP-16DAV
MASS[Typ.]
0.24g
NOTE)
1. DIMENSIONS"*1 (Nom)"AND"*2"
DO NOT INCLUDE MOLD FLASH.
2. DIMENSION"*3"DOES NOT
INCLUDE TRIM OFFSET.
*1
D
F
16
9
bp
Index mark
Dimension in Millimeters
Reference
Symbol
Min
Nom
10.06
5.50
Max
10.5
Terminal cross section
( Ni/Pd/Au plating )
D
E
1
8
bp
A 2
A 1
A
*3
e
0.00
0.34
0.15
0.10
0.40
0.20
0.20
2.20
0.46
Z
x
M
L1
b p
b 1
c
0.25
c
1
θ
H E
e
0
°
8°
7.50
7.80
1.27
8.00
y
x
0.12
0.15
0.80
0.90
L
y
Z
Detail F
L
0.50
0.70
1.15
L
1
Rev.2.00, Feb.18.2005, page 6 of 6
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