935166890118 [NXP]

IC HC/UH SERIES, OCTAL 1-BIT DRIVER, TRUE OUTPUT, PDSO20, PLASTIC, SSOP-20, Bus Driver/Transceiver;


型号：	935166890118
厂家：	NXP
描述：	IC HC/UH SERIES, OCTAL 1-BIT DRIVER, TRUE OUTPUT, PDSO20, PLASTIC, SSOP-20, Bus Driver/Transceiver 驱动光电二极管输出元件
文件：	总7页 (文件大小：44K)
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/HCT244

Octal buffer/line driver; 3-state

December 1990

Product speciﬁcation

File under Integrated Circuits, IC06

Philips Semiconductors

Product speciﬁcation

Octal buffer/line driver; 3-state

74HC/HCT244

The 74HC/HCT244 are octal non-inverting buffer/line

drivers with 3-state outputs. The 3-state outputs are

controlled by the output enable inputs 1OE and 2OE.

A HIGH on nOE causes the outputs to assume a high

impedance OFF-state. The “244” is identical to the “240”

but has non-inverting outputs.

FEATURES

• Output capability: bus driver

• I_CCcategory: MSI

GENERAL DESCRIPTION

The 74HC/HCT244 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.

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

1A_nto 1Y_n;

2A_nto 2Y_n

C_I

input capacitance

3.5

C_PD

power dissipation capacitance per buffer

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_CC× f_o) = sum of outputs

C_L= output load capacitance in pF

_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

Octal buffer/line driver; 3-state

74HC/HCT244

PIN DESCRIPTION

PIN NO.

SYMBOL

1OE

NAME AND FUNCTION

output enable input (active LOW)

data inputs

2, 4, 6, 8

3, 5, 7, 9

1A₀to 1A₃

2Y₀to 2Y₃

GND

bus outputs

ground (0 V)

17, 15, 13, 11 2A₀to 2A₃

18, 16, 14, 12 1Y₀to 1Y₃

data inputs

bus outputs

2OE

V_CC

output enable input (active LOW)

positive supply voltage

Fig.1 Pin configuration.

Fig.2 Logic symbol.

Fig.3 IEC logic symbol.

December 1990

Philips Semiconductors

Product speciﬁcation

Octal buffer/line driver; 3-state

74HC/HCT244

FUNCTION TABLE

INPUTS

nOE

OUTPUT

nY_n

nA_n

Note

1. H = HIGH voltage level

L = LOW voltage level

X = don’t care

Z = high impedance OFF-state

Fig.4 Functional diagram.

December 1990

Philips Semiconductors

Product speciﬁcation

Octal buffer/line driver; 3-state

74HC/HCT244

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

(V)

+25

−40 to +85 −40 to +125

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

t_PHL/ t_PLHpropagation delay

1A_nto 1Y_n;

110

145

165

2.0 Fig.5

4.5

6.0

2A_nto 2Y_n

_PZH/ t_PZL3-state output enable time

1OE to 1Y_n;

150

190

225

2.0 Fig.6

4.5

6.0

2OE to 2Y_n

_PHZ/ t_PLZ3-state output disable time

1OE to 1Y_n;

150

190

225

2.0 Fig.6

4.5

6.0

2OE to 2Y_n

_THL/ t_TLHoutput transition time

2.0 Fig.5

4.5

6.0

December 1990

Philips Semiconductors

Product speciﬁcation

Octal buffer/line driver; 3-state

74HC/HCT244

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

1A_n

2A_n

1OE

2OE

0.70

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

1A_nto 1Y_n;

4.5 Fig.5

2A_nto 2Y_n

_PZH/ t_PZL3-state output enable time

1OE to 1Y_n;

4.5 Fig.6

4.5 Fig.5

2OE to 2Y_n

_PHZ/ t_PLZ3-state output disable time

1OE to 1Y_n;

2OE to 2Y_n

_THL/ t_TLHoutput transition time

December 1990

Philips Semiconductors

Product speciﬁcation

Octal buffer/line driver; 3-state

74HC/HCT244

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.5 Waveforms showing the input (1A_n, 2A_n) to output (1Y_n, 2Y_n) 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.6 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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