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PDF M74HCT640 Data sheet ( Hoja de datos )

Número de pieza M74HCT640
Descripción OCTAL BUS TRANSCEIVER3-STATE: HCT245 NON INVERTING HCT640 INVERTING / HCT643 INVERTING/NON INVERTING
Fabricantes ST Microelectronics 
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No Preview Available ! M74HCT640 Hoja de datos, Descripción, Manual

M54/74HCT245/640/643
M54/74HCT245/640/643
OCTAL BUS TRANSCEIVER (3-STATE): HCT245 NON INVERTING
HCT640 INVERTING, HCT643 INVERTING/NON INVERTING
. HIGH SPEED
tPD = 10 ns (TYP.) at VCC = 5V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) at TA = 25 oC
. COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN.) VIL = 0.8V (MAX.)
. OUTPUT DRIVE CAPABILITY
15 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
|IOH| = IOL = 6 mA (MIN)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS245/640/643
DESCRIPTION
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCTXXXF1R M74HCTXXXM1R
M74HCTXXXB1R M74HCTXXXC1R
The M54/74HCT245, HCT640 and HCT643 utilise
silicon gate C2MOS technology to achive operating
speeds eqivalent to LSTTL devices.
Along with the low power dissipation and high noise
immunity of standad CMOS integrated circuit, it
possesses the capability to drive 15 LSTTL loads.
These IC’s are intended for two-way asynchronous
communication between data buses, and the
direction of data trasmission is determined by DIR
input. The enable input (G) can be used to disable
the device so that the buses are effectively isolated.
All input are equipped with protection circuits
against static discharge and transient discharge.
These integrated circuits have input and output
characteristics that are fully compatible with 54/74
LSTTL logic families. M54/74HCT devices are
designed to directly interface HSC2MOS systems
with TTL and NMOS components. They are also
plug in replacements for LSTTL devices giving a
reduction of power consumption.
IT IS PROHIBITED TO APPLY A SIGNAL TO A
BUS TERMINAL WHEN IT IS IN OUTPUT MODE
AND WHEN A BUS THERMINAL IS FLOATING
(HIGH IMPEDANCE STATE), IT IS REQUESTED
TO FIX THE INPUT LEVEL BY MEANS OF
EXTERNAL PULL DOWN OR PULL UP
RESISTOR.
PIN CONNECTION (top view)
HCT245
HCT640
HCT643
October 1993
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1 page




M74HCT640 pdf
M54/M74HCT245/640/643
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
Test Conditions
VCC CL
(V) (pF)
TA = 25 oC
54HC and 74HC
Min. Typ. Max.
Value
-40 to 85 oC
74HC
Min. Max.
-55 to 125 oC
54HC
Min. Max.
Unit
tTLH Output Transition 4.5 50
tTHL Time
tPLH Propagation
tPHL Delay Time
4.5 50
4.5 150
7 12 15 18 ns
13 22 28 33 ns
18 30 38 45 ns
tPZL Output Enable
4.5 50 RL = 1K
19 30
38
45 ns
tPZH Time
4.5 150 RL = 1K
24 38
48
57 ns
tPLZ Output Disable
tPHZ Time
4.5 50 RL = 1K
17 30
38
45 ns
CIN
CI/OUT
Input Capacitance
Output
Capacitance
DIR, G
An, Bn
5 10 10 10 pF
13 pF
CPD (*) Power Dissipation
Capacitance
HCT245
HCT640/643
41
39
pF
(*) 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 operting current can be obtained by the following equation. ICC(opr) = CPD VCC fIN + ICC/8 (per circuit)
SWITCHING CHARACTERISTICS TEST WAVEFORM
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M74HCT640 arduino
M54/M74HCT245/640/643
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
© 1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A
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