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M74HCT643B1R
OCTALE BUS TRANSCEIVER (3-STATE)
1/11August 2001 HIGH SPEED:
tPD = 13ns (TYP.) at VCC = 4.5V LOW POWER DISSIPATION:CC = 4μA(MAX.) at TA =25°C COMPATIBLE WITH TTL OUTPUTS : IH = 2V (MIN.) VIL = 0.8V (MAX) SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 6mA (MIN) BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 643
DESCRIPTIONThe M74HCT643 is an advanced high-speed
CMOS OCTAL BUS TRANSCEIVER (3-STATE)
fabricated with silicon gate C2 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.
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.
M74HCT643OCTAL BUS TRANSCEIVER
WITH 3 STATE OUTPUTS (INVERTED/NON INVERTED)
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
M74HCT6432/11
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE X : Don’t Care
Z : High Impedance
LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays
M74HCT6433/11
ABSOLUTE MAXIMUM RATINGS 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 °C; derate to 300mW by 10mW/°C from 65°C to 85°C
RECOMMENDED OPERATING CONDITIONS
M74HCT6434/11
DC SPECIFICATIONS
M74HCT6435/11
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
CAPACITIVE CHARACTERISTICS 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. ICC(opr) = CPD x VCC x fIN + ICC/8 (per circuit)
M74HCT6436/11
TEST CIRCUIT CL = 50pF/150pF or equivalent (includes jig and probe capacitance)
R1 = 1KΩ or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
WAVEFORM 1 : PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle)
