CD74HC85M datasheet(1/17 Pages) TI

部件名	CD74HC85M

功能描述	High-Speed CMOS Logic 4-Bit Magnitude Comparator

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制造商	TI [Texas Instruments]

网页	http://www.ti.com

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1

Data sheet acquired from Harris Semiconductor

SCHS136E

Features

• Buffered Inputs and Outputs

• Typical Propagation Delay: 13ns (Data to Output at

VCC = 5V, CL = 15pF, TA = 25

oC

• Serial or Parallel Expansion Without External Gating

• Fanout (Over Temperature Range)

- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55oC to 125oC

• Balanced Propagation Delay and Transition Times

• Signiﬁcant Power Reduction Compared to LSTTL

Logic ICs

• HC Types

- 2V to 6V Operation

- High Noise Immunity: NIL = 30%, NIH = 30%of VCC at

VCC = 5V

• HCT Types

- 4.5V to 5.5V Operation

- Direct LSTTL Input Logic Compatibility,

VIL= 0.8V (Max), VIH = 2V (Min)

- CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH

Pinout

CD54HC85, CD54HCT85 (CERDIP)

CD74HC85 (PDIP, SOIC, SOP, TSSOP)

CD74HCT85 (PDIP, SOIC)

TOP VIEW

Description

The ’HC85 and ’HCT85 are high speed magnitude

comparators that use silicon-gate CMOS technology to

achieve operating speeds similar to LSTTL with the low

power consumption of standard CMOS integrated circuits.

These 4-bit devices compare two binary, BCD, or other

monotonic codes and present the three possible magnitude

results at the outputs (A > B, A < B, and A = B). The 4-bit

input words are weighted (A0 to A3 and B0 to B3), where A3

and B3 are the most signiﬁcant bits.

The devices are expandable without external gating, in both

serial and parallel fashion. The upper part of the truth table

indicates operation using a single device or devices in a

serially

expanded

application.

The

parallel

expansion

scheme is described by the last three entries in the truth

table.

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

B3

(A < B) IN

(A = B) IN

(A > B) IN

(A > B) OUT

(A = B) OUT

GND

(A < B) OUT

VCC

B2

A2

A1

B1

A0

B0

A3

Ordering Information

PART NUMBER

TEMP. RANGE

(oC)

PACKAGE

CD54HC85F3A

-55 to 125

16 Ld CERDIP

CD54HCT85F3A

-55 to 125

16 Ld CERDIP

CD74HC85E

-55 to 125

16 Ld PDIP

CD74HC85M

-55 to 125

16 Ld SOIC

CD74HC85MT

-55 to 125

16 Ld SOIC

CD74HC85M96

-55 to 125

16 Ld SOIC

CD74HC85NSR

-55 to 125

16 Ld SOP

CD74HC85PW

-55 to 125

16 Ld TSSOP

CD74HC85PWR

-55 to 125

16 Ld TSSOP

CD74HC85PWT

-55 to 125

16 Ld TSSOP

CD74HCT85E

-55 to 125

16 Ld PDIP

CD74HCT85M

-55 to 125

16 Ld SOIC

CD74HCT85MT

-55 to 125

16 Ld SOIC

CD74HCT85M96

-55 to 125

16 Ld SOIC

NOTE: When ordering, use the entire part number. The sufﬁxes 96

and R denote tape and reel. The sufﬁx T denotes a small-quantity

reel of 250.

August 1997 - Revised October 2003

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

Copyright

CD54HC85, CD74HC85,

CD54HCT85, CD74HCT85

High-Speed CMOS Logic

4-Bit Magnitude Comparator

[ /Title

(CD74

HC85,

CD74

HCT85

)

/Sub-

ject

(High

Speed

CMOS

Logic

4-Bit

Magni-

tude

Com-

para-

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