Datasheet M74HCT640 Datasheet (ST)

M74HCT640

OCTAL BUS TRANSCEIVER

WITH 3 STATE OUTPUTS (INVERTED)

■ HIGH SPEED:

t

= 13ns (TYP.) at VCC = 4.5V

PD

■ LOW POWER DISSIPATION:

I

= 4µA(MAX.) at TA=25°C

CC

■ COMPA TIBLE WITH TTL OUTPUTS :

V

= 2V (MIN.) VIL = 0.8V (MAX)

IH

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

| = IOL = 6mA (MIN)

OH

■ BALANCED PROPAGATION DELAYS:

t

≅ t

PHL

PLH

■ PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 640

DESCRIPTION

The M74HCT640 is an advanced high-speed CMOS OCTAL BUS TRANSCEIVER (3-STATE) fabricated with silicon gate C

2

MOS technology. This IC is intended for two-way asynchronous communication between data buses, and the direction of data transmission is determined by DIR input. The enable input G

can be used to disable the device so that the buses are effectively isolated.

TSSOPDIP SOP

ORDER CODES

PACKAGE TUBE T & R

DIP M74HCT640B1R

SOP M74HCT640M1R M74HCT640RM13TR

TSSOP M74HCT640TTR

All inputs are equipped with protection circuits against static discharge and transient excess voltage. All floating bus terminals during High Z State must be held HIGH or LOW.

PIN CONNECTION AND IEC LOGIC SYMBOLS

1/11August 2001

M74HCT640

INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION

1 DIR Directional Control

2, 3, 4, 5, 6,

7, 8, 9

18, 17, 16, 15, 14, 13,

12, 11

19 G 10 GND Ground (0V) 20 V

TRUTH TABLE

A1 to A8 Data Inputs/Outputs

B1 to B8 Data Inputs/Outputs

CC

Output Enable Input

Positive Supply Voltage

INPUTS FUNCTION

G

L L OUTPUT INPUT A = B L H INPUT OUTPUT B = A

HXZZZ

X : Don’t Care Z : High Impedance

LOGIC DIAGRAM

DIR A BUS B BUS

OUTPUT

This log i c diagram has not be used to esti m ate propagation delays

2/11

M74HCT640

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

I

OK

I

or I

CC

P

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied (*) 500mW at 65

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit

V

V T t

r

Supply Voltage

CC

DC Input Voltage -0.5 to VCC + 0.5

I

DC Output Voltage -0.5 to VCC + 0.5

O

DC Input Diode Current

IK

DC Output Diode Current DC Output Current

O

DC VCC or Ground Current

GND

Power Dissipation

D

Storage Temperature

stg

Lead Temperature (10 sec)

L

°C; derate to 300mW by 10mW/°C from 65°C to 85°C

Supply Voltage

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature

op

, t

Input Rise and Fall Time (VCC = 4.5 to 5.5V)

f

-0.5 to +7 V

± 20 mA ± 20 mA ± 35 mA ± 70 mA

500(*) mW

-65 to +150 °C

300 °C

4.5 to 5.5 V

CC CC

-55 to 125 °C 0 to 500 ns

V V

3/11

M74HCT640

DC SPECIFICATIONS

Symbol Parameter

V

I

∆ I

High Level Input

IH

Voltage

Low Level Input

IL

Voltage

High Level Output

OH

Voltage Low Level Output

OL

Voltage

I

Input Leakage

I

Current High Impedance

OZ

Output Leakage Current

Quiescent Supply

CC

Current Additional Worst

CC

Case Supply Current

Test Condition Value

T

= 25°C

V

(V)

CC

A

Min. Typ. Max. Min. Max. Min. Max.

4.5 to

2.0 2.0 2.0 V

5.5

4.5 to

0.8 0.8 0.8 V

5.5

4.5

5.5

IO=-20 µA

I

=-6.0 mA

O

IO=20 µA

I

=6.0 mA

O

= VCC or GND

V

I

= VIH or V

V

I

VO = VCC or GND

= VCC or GND

V

I

5.5 Per Input pin

= 0.5V or

V

I

V

= 2.4V

I

4.4 4.5 4.4 4.4

4.18 4.31 4.13 4.10

0.0 0.1 0.1 0.1

0.17 0.26 0.33 0.40 ± 0.1 ± 1 ± 1 µA

IL

± 0.5 ± 5 ± 10 µA

2.0 2.9 3.0 mA

Other Inputs at

V

or GND

CC

I

= 0

O

-40 to 85°C -55 to 125°C

Unit

V

44080µA

4/11

M74HCT640

AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)

Test Condition Value

T

Symbol Parameter

t

TLH tTHL

t

PLH tPHL

t

PZL tPZH

Output Transition Time

Propagation Delay Time

High Impedance Output Enable Time

t

PLZ tPHZ

High Impedance Output Disable

C

V

CC

(V)

L

(pF)

4.5 50 7 12 15 18 ns 50 13 22 28 33

4.5

150 18 30 38 45

R

50

4.5

150

4.5 50

= 1 KΩ

L

R

= 1 KΩ

L

R

= 1 KΩ

L

= 25°C

A

Min. Typ. Max. Min. Max. Min. Max.

19 30 38 45 24 38 48 57

17 30 38 45 ns

Time

CAPACITIVE CHARACTERISTICS

Test Condition Value

T

Symbol Parameter

V

CC

(V)

C

I/OUT

C

Input Capacitance

IN

Output Capacitance

Power Dissipation

PD

Capacitance (note

DIR, G An, Bn 13 pF

1)

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without

load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I

= 25°C

A

Min. Typ. Max. Min. Max. Min. Max.

5101010pF

37 pF

-40 to 85°C -55 to 125°C

= CPD x VCC x fIN + ICC/8 (per circuit)

CC(opr)

Unit

ns

Unit

5/11

M74HCT640

TEST CIRCUIT

TEST SWITCH

t

, t

PLH

PHL

, t

t

PZL

PLZ

t

, t

PZH

PHZ

CL = 50pF/150p F or equivalen t (includes j i g and probe capacitance ) R

= 1KΩ or equivalent

1

R

= Z

of pulse generator (typically 50Ω)

T

OUT

Open

V

CC

GND

WAVEFORM 1 : PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle)

6/11

M74HCT640

WAVEFORM 2 : OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)

7/11

M74HCT640

Plastic DIP-20 (0.25) MECHANICAL DATA

mm. inch

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

a1 0.254 0.010

B 1.39 1.65 0.055 0.065 b 0.45 0.018

b1 0.25 0.010

D 25.4 1.000 E 8.5 0.335

e 2.54 0.100

e3 22.86 0.900

F 7.1 0.280

I 3.93 0.155

L 3.3 0.130

Z 1.34 0.053

8/11

P001J

SO-20 MECHANICAL DATA

M74HCT640

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 2.65 0.104 a1 0.1 0.2 0.004 0.008 a2 2.45 0.096

b 0.35 0.49 0.014 0.019

b1 0.23 0.32 0.009 0.012

C 0.5 0.020 c1 45° (typ.)

D 12.60 13.00 0.496 0.512

E 10.00 10.65 0.393 0.419

e 1.27 0.050

e3 11.43 0.450

F 7.40 7.60 0.291 0.300

L 0.50 1.27 0.020 0.050

M 0.75 0.029

S8° (max.)

mm. inch

PO13L

9/11

M74HCT640

TSSOP20 MECHANICAL DATA

mm. inch

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 1.2 0.047

A1 0.05 0.15 0.002 0.004 0.006

A2 0.8 1 1.05 0.031 0.039 0.041

b 0.19 0.30 0.007 0.012

c 0.09 0.20 0.004 0.0089

D 6.4 6.5 6.6 0.252 0.256 0.260

E 6.2 6.4 6.6 0.244 0.252 0.260

E1 4.3 4.4 4.48 0.169 0.173 0.176

e 0.65 BSC 0.0256 BSC

K0° 8°0° 8°

L 0.45 0.60 0.75 0.018 0.024 0.030

A2

A

A1

b

e

K

c

L

E

D

E1

PIN 1 IDENTIFICATION

10/11

1

0087225C

M74HCT640

Information furnished is bel ieved to be accurate and reliable. However, STMicroe lectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No li cense is granted by i mp lication or otherwise under a ny patent or patent rig h ts of S TMic roelec tronics. Specifications mentioned in this publication ar e subject to change without notice. This publication supersedes and replaces all information previously supplied. S TMicroelectronics products are not authorized for use as critica l components in life suppo rt devices or systems without express written approval of STMicroelectronics.

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