935190340118 [NXP]

Magnitude Comparator, HC/UH Series, 4-Bit, True Output, CMOS, PDSO16;


型号：	935190340118
厂家：	NXP
描述：	Magnitude Comparator, HC/UH Series, 4-Bit, True Output, CMOS, PDSO16 光电二极管逻辑集成电路
文件：	总9页 (文件大小：67K)
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 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/HCT85

4-bit magnitude comparator

December 1990

Product speciﬁcation

File under Integrated Circuits, IC06

Philips Semiconductors

Product speciﬁcation

4-bit magnitude comparator

74HC/HCT85

weighted (A₀to A₃and B₀to B₃), where A₃and B₃are the

most significant bits.

FEATURES

• Serial or parallel expansion without extra gating

• Magnitude comparison of any binary words

• Output capability: standard

The operation of the “85” is described in the function table,

showing all possible logic conditions. The upper part of the

table describes the normal operation under all conditions

that will occur in a single device or in a series expansion

scheme. In the upper part of the table the three outputs are

mutually exclusive. In the lower part of the table, the

outputs reflect the feed forward conditions that exist in the

parallel expansion scheme.

• I_CCcategory: MSI

GENERAL DESCRIPTION

The 74HC/HCT85 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.

For proper compare operation the expander inputs (I_A>B

I_A=Band I_A<B) to the least significant position must be

connected as follows: I_A<B= I_A>B= = LOW and

The 74HC/HCT85 are 4-bit magnitude comparators 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 (Q_A>B, Q_A=Band Q_A<B). The 4-bit inputs are

I_A=B= HIGH.

For words greater than 4-bits, units can be cascaded by

connecting outputs Q_A<B, Q_A>Βand Q_A=Bto the

corresponding inputs of the significant comparator.

QUICK REFERENCE DATA

GND = 0 V; T_amb= 25 °C; t_r= t_f= 6 ns

TYPICAL

SYMBOL

PARAMETER

propagation delay

CONDITIONS

UNIT

HCT

t_PHL/t_PLH

C_L= 15 pF; V_CC= 5 V

A_n, B_nto Q_A>B, Q_A<B

A_n, B_nto Q_A=B

3.5

_A<B,, I_A=B, I_A>Bto Q_A<B, Q_A>B

_A=Bto Q_A=B

C_I

input capacitance

3.5

C_PD

power dissipation capacitance per package

notes 1 and 2

Notes

1. C_PDis used to determine the dynamic power dissipation (P_Din µW):

P_D= C_PD× V_CC²× f_i+ ∑ (C_L× V_CC× f_o) where:

f_i= input frequency in MHz

f_o= output frequency in MHz

∑ (C_L× V_CC²× f_o) = sum of outputs

C_L= output load capacitance in pF

V_CC= supply voltage in V

2. For HC the condition is V_I= GND to V_CC

For HCT the condition is V_I= GND to V_CC− 1.5 V

ORDERING INFORMATION

See “74HC/HCT/HCU/HCMOS Logic Package Information”.

December 1990

Philips Semiconductors

Product speciﬁcation

4-bit magnitude comparator

74HC/HCT85

PIN DESCRIPTION

PIN NO.

SYMBOL

NAME AND FUNCTION

I_A<B

A < B expansion input

A = B expansion input

A > B expansion input

A > B output

I_A=B

I_A>B

Q_A>B

Q_A=B

Q_A<B

GND

B₀to B₃

A₀to A₃

V_CC

A = B output

A < B output

ground (0 V)

9, 11, 14, 1,

10, 12, 13, 15

word B inputs

word A inputs

positive supply voltage

Fig.1 Pin configuration.

Fig.2 Logic symbol.

Fig.3 IEC logic symbol.

December 1990

Philips Semiconductors

Product speciﬁcation

4-bit magnitude comparator

74HC/HCT85

Fig.4 Functional diagram.

APPLICATIONS

• Process controllers

• Servo-motor control

FUNCTION TABLE

COMPARING INPUTS

CASCADING INPUTS

OUTPUTS

A₃, B₃

A₂, B₂

A₁, B₁

A₀, B₀

I_A>B

I_A<B

I_A=B

Q_A>B

Q_A<B

Q_A=B

A₃>B₃

A₃<B₃

A₃=B₃

A₂>B₂

A₂<B₂

A₃=B₃

A₂=B₂

A₁>B₁

A₁<B₁

A₁=B₁

A₀>B₀

A₀<B₀

A₃=B₃

A₂=B₂

A₁=B₁

A₀=B₀

A₃=B₃

A₂=B₂

A₁=B₁

A₀=B₀

Notes

1. H = HIGH voltage level

L = LOW voltage level

X = don’t care

December 1990

Philips Semiconductors

Product speciﬁcation

4-bit magnitude comparator

74HC/HCT85

Fig.5 Logic diagram.

December 1990

Philips Semiconductors

Product speciﬁcation

4-bit magnitude comparator

74HC/HCT85

DC CHARACTERISTICS FOR 74HC

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: standard

I_CCcategory: MSI

AC CHARACTERISTICS FOR 74HC

GND = 0 V; t_r= t_f= 6 ns; C_L= 50 pF

T_amb(°C)

TEST CONDITIONS

74HC

SYMBOL PARAMETER

V_CC

+25

−40 to +85 −40 to +125 UNIT

WAVEFORMS

(V)

min. typ. max. min. max. min. max.

t_PHL/ t_PLHpropagation delay

A_n, B_nto Q_A>Bor Q_A<B

195

245

295

2.0 Fig.6

4.5

6.0

_PHL/ t_PLHpropagation delay

175

220

265

2.0 Fig.6

4.5

6.0

A_n, B_nto Q_A=B

_PHL/ t_PLHpropagation delay

I_A<B, I_A=B, I_A>Bto

140

175

210

2.0 Fig.6

4.5

6.0

Q_A<B, Q_A>B

_PHL/ t_PLHpropagation delay

120

150

180

2.0 Fig.6

4.5

6.0

_A=Bto Q_A=B

_THL/ t_TLHoutput transition time

110

2.0 Fig.6

4.5

6.0

December 1990

Philips Semiconductors

Product speciﬁcation

4-bit magnitude comparator

74HC/HCT85

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: standard

I_CCcategory: MSI

Note to HCT types

The value of additional quiescent supply current (∆I_CC) for a unit load of 1 is given in the family specifications.

To determine ∆I_CCper input, multiply this value by the unit load coefficient shown in the table below.

INPUT

UNIT LOAD COEFFICIENT

I_A<B

I_A>B

I_A=B

A_n, B_n

1.00

1.50

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; t_r= t_f= 6 ns; C_L= 50 pF

T_amb(°C)

TEST CONDITIONS

74HCT

SYMBOL PARAMETER

V_CC

+25

−40 to +85 −40 to +125 UNIT

WAVEFORMS

(V)

min. typ. max. min. max. min. max.

t_PHL/ t_PLHpropagation delay

A_n, B_nto Q_A>Bor Q_A<B

4.5 Fig.6

_PHL/ t_PLHpropagation delay

A_n, B_nto Q_A=B

_PHL/ t_PLHpropagation delay

_A<B, I_A=B, I_A>Bto

Q_A<B, Q_A>B

t_PHL/ t_PLHpropagation delay

I_A=Bto Q_A=B

4.5 Fig.6

_THL/ t_TLHoutput transition time

December 1990

Philips Semiconductors

Product speciﬁcation

4-bit magnitude comparator

74HC/HCT85

AC WAVEFORMS

(1) HC : V_M= 50%; V_I= GND to V_CC

HCT: V_M= 1.3 V; V_I= GND to 3 V.

Fig.6 Waveforms showing the word A inputs (A_n), word B inputs (B_n) and expansion inputs (I_n) to the outputs

(Q_n) propagation delays and the output transition times.

APPLICATION INFORMATION

Fig.7 Series cascading; comparing 12-bit words.

December 1990

Philips Semiconductors

Product speciﬁcation

4-bit magnitude comparator

74HC/HCT85

Fig.8 Parallel cascading; comparing 12-bit words.

PACKAGE OUTLINES

See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.

December 1990

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