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74HCT85D Datasheet Preview

74HCT85D Datasheet

4-bit magnitude comparator

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74HC85; 74HCT85
4-bit magnitude comparator
Rev. 3 — 20 April 2018
Product data sheet
1 General description
The 74HC85; 74HCT85 is a 4-bit magnitude comparator that can be expanded to almost
any length. They perform comparison of two 4-bit binary, BCD or other monotonic codes
and present the three possible magnitude results at the outputs (QA>B, QA=B and QA<B).
The 4-bit inputs are weighted (A0 to A3 and B0 to B3), where A3 and B3 are the most
significant bits. For proper compare operation the expander inputs (IA>B, IA=B and IA<B)
to the least significant position must be connected as follows: IA<B = IA>B = LOW
and IA=B = HIGH. For words greater than 4-bits, units can be cascaded by connecting
outputs QA>B, QA=B and QA<B to the corresponding inputs of the significant comparator.
Inputs include clamp diodes. This enables the use of current limiting resistors to interface
inputs to voltages in excess of VCC.
2 Features and benefits
Wide supply voltage range from 2.0 to 6.0 V
CMOS low power dissipation
High noise immunity
Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
Input levels:
For 74HC85: CMOS level
For 74HCT85: TTL level
Complies with JEDEC standard: no. 7A
JESD8C (2.7 V to 3.6 V)
JESD7A (2.0 V to 6.0 V)
ESD protection:
HBM JESD22-A114-A exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
3 Applications
Process controllers
Servo-motor control




nexperia

74HCT85D Datasheet Preview

74HCT85D Datasheet

4-bit magnitude comparator

No Preview Available !

Nexperia
74HC85; 74HCT85
4-bit magnitude comparator
4 Ordering information
Table 1. Ordering information
Type number Package
Temperature range
74HC85D
−40 °C to +125 °C
74HCT85D
74HC85DB
−40 °C to +125 °C
74HCT85DB
74HC85PW
−40 °C to +125 °C
Name
SO16
SSOP16
TSSOP16
Description
plastic small outline package; 16 leads;
body width 3.9 mm
plastic shrink small outline package; 16 leads;
body width 5.3 mm
plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
Version
SOT109-1
SOT338-1
SOT403-1
5 Functional diagram
10 A0
9 B0
12 A1
11 B1
13 A2
14 B2
15 A3
1 B3
QA<B
7
QA=B
6
QA>B
5
2
IA<B
3
IA=B
4
IA>B
aaa-028459
Figure 1. Logic symbol
COMP
10 0
12
P
13
15 3
90
11
Q
14
13
P<Q 7
P=Q 6
P>Q 5
2 P<Q
3 P=Q
4 P>Q
aaa-028460
Figure 2. IEC logic symbol
10 A0
9 B0
12 A1
11 B1
13 A2
14 B2
15 A3
1 B3
2 IA<B
3 IA=B
4 IA>B
QA<B 7
QA=B 6
QA>B 5
aaa-028461
Figure 3. Functional diagram
74HC_HCT85
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 20 April 2018
© Nexperia B.V. 2018. All rights reserved.
2 / 19


Part Number 74HCT85D
Description 4-bit magnitude comparator
Maker nexperia
PDF Download

74HCT85D Datasheet PDF






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