74HC253D各脚功能电路原理芯片引脚定义引脚图及功能IC贸易商-中国IC网-芯三七

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产品型号74HC253D的概述

芯片74HC253D的概述 74HC253D是一种高性能的CMOS逻辑集成电路，主要用于数字信号的选择和数据选择/存取操作。其设计宗旨在于支持数据选择和多路选择功能，广泛应用于各类电子设备和电路设计中。作为一种双四路选择器/多路复用器，74HC253D可用于数据线路的选择，能够灵活地将多个输入信号合并为一个输出信号，使得多个信号的传输变得高效，简化电路的复杂度。 74HC253D属于74HC系列芯片，这一系列芯片以其高速度和低功耗著称，常用于计算机、通信设备及消费电子等领域。74HC253D基于高层次CMOS结构设计，提供很好的噪声免疫力和极高的输出驱动能力，使其成为理想的选择器和多路复用器。芯片74HC253D的详细参数 74HC253D的主要技术参数包括： - 供电电压(VCC): 2V到6V - 输入电压(VIL): 0.3VCC（最大值） - 输入电压(VIH): 0.7VC...

产品型号74HC253D的Datasheet PDF文件预览

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/HCT253

Dual 4-input multiplexer; 3-state

December 1990

Product speciﬁcation

File under Integrated Circuits, IC06

Philips Semiconductors

Product speciﬁcation

Dual 4-input multiplexer; 3-state

74HC/HCT253

The 74HC/HCT253 have two identical 4-input multiplexers

with 3-state outputs which select two bits from four sources

selected by common data select inputs (S₀, S₁).

When the individual output enable (1OE, 2OE) inputs of

the 4-input multiplexers are HIGH, the outputs are forced

to the high impedance OFF-state. The “253” is the logic

implementation of a 2-pole, 4-position switch, where the

position of the switch is determined by the logic levels

applied to S₀and S₁.

FEATURES

• Non-inverting data path

• 3-state outputs for bus interface

• and multiplex expansion

• Common select inputs

• Separate output enable inputs

• Output capability: bus driver

• I_CCcategory: MSI

The logic equations for the outputs are:

1Y = 1OE(1l₀.S₁.S₀+1I₁.S₁.S₀+1I₂.S₁.S₀+1I₃.S₁.S₀)

2Y = 2OE(2l₀.S₁.S₀+2I₁.S₁.S₀+2I₂.S₁.S₀+2I₃.S₁.S₀)

GENERAL DESCRIPTION

The 74HC/HCT253 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.

APPLICATIONS

• Data selectors

• Data multiplexers

QUICK REFERENCE DATA

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

TYPICAL

SYMBOL

PARAMETER

CONDITIONS

UNIT

HCT

t_PHL/ t_PLH

propagation delay

1I_n, 2I_nto nY;

S_nto nY

C_L= 15 pF; V_CC= 5 V

3.5

C_I

input capacitance

3.5

C_PD

power dissipation capacitance per multiplexer

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_CC²× 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

Dual 4-input multiplexer; 3-state

74HC/HCT253

PIN DESCRIPTION

PIN NO.

1, 15

14, 2

7, 9

SYMBOL

1OE, 2OE

S₀, S₁

NAME AND FUNCTION

output enable inputs (active LOW)

common data select inputs

3-state multiplexer outputs

ground (0 V)

1Y, 2Y

GND

6, 5, 4, 3

1I₀to 1I₃

data inputs from source 1

data inputs from source 2

positive supply voltage

10, 11, 12, 13 2I₀to 2I₃

V_CC

Fig.1 Pin configuration.

Fig.2 Logic symbol.

Fig.3 IEC logic symbol.

December 1990

Philips Semiconductors

Product speciﬁcation

Dual 4-input multiplexer; 3-state

74HC/HCT253

Fig.4 Functional diagram.

Fig.5 Logic diagram.

FUNCTION TABLE

SELECT INPUTS

DATA INPUTS

OUTPUT ENABLE OUTPUT

S₀

S₁

nI₀

nI₁

nI₂

nI₃

nOE

NOTES

1. H = HIGH voltage level

L = LOW voltage level

X = don’t care

Z = high impedance OFF-state

December 1990

Philips Semiconductors

Product speciﬁcation

Dual 4-input multiplexer; 3-state

74HC/HCT253

DC CHARACTERISTICS FOR 74HC

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

Output capability: bus driver

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

UNIT

WAVEFORMS

V_CC

+25

−40 to +85

−40

to +125

(V)

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

t_PHL/ t_PLHpropagation delay

1I_nto nY;

175

220

265 ns

2.0

4.5

6.0

Fig.6

Fig.7

Fig.6

2I_nto nY

_PHL/ t_PLHpropagation delay

S_nto nY

175

220

265 ns

2.0

4.5

6.0

_PZH/ t_PZL3-state output enable time

nOE to nY

100

125

150 ns

2.0

4.5

6.0

_PHZ/ t_PLZ3-state output disable time

nOE to nY

150

190

225 ns

2.0

4.5

6.0

_THL/ t_TLHoutput transition time

2.0

4.5

6.0

December 1990

Philips Semiconductors

Product speciﬁcation

Dual 4-input multiplexer; 3-state

74HC/HCT253

DC CHARACTERISTICS FOR 74HCT

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

Output capability: bus driver

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

1I_n

2I_n

nOE

S₀

0.40

1.10

S₁

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

UNIT

WAVEFORMS

V_CC

(V)

+25

−40 to +85 −40 to +125

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

t_PHL/ t_PLHpropagation delay

1I_nto nY;

4.5 Fig.6

2I_nto nY

_PHL/ t_PLHpropagation delay

S_nto nY

4.5 Fig.6

4.5 Fig.7

4.5 Fig.6

_PZH/ t_PZL3-state output enable time

nOE to nY

_PHZ/ t_PLZ3-state output disable time

nOE to nY

t_THL/ t_TLHoutput transition time

December 1990

Philips Semiconductors

Product speciﬁcation

Dual 4-input multiplexer; 3-state

74HC/HCT253

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 input (1I_n, 2I_n) to output (1Y, 2Y) propagation delays and the output transition

times.

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

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

Fig.7 Waveforms showing the 3-state enable and disable times.

PACKAGE OUTLINES

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

December 1990

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产品型号74HC253D的概述

产品型号74HC253D的Datasheet PDF文件预览

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