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M74HCT688RM13TR
8 BIT EQUALITY COMPARATOR
1/9September 2001 HIGH SPEED:
tPD = 21ns (TYP.) at VCC = 4.5V LOW POWER DISSIPATION:
ICC = 4μA(MAX.) at TA=25°C COMPATIBLE WITH TTL OUTPUTS :
VIH = 2V (MIN.) VIL = 0.8V (MAX) SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 688
DESCRIPTIONThe M74HCT688 is an high speed CMOS 8 BIT
EQUALITY COMPARATOR fabricated with silicon
gate C2 MOS technology.
The M74HCT688 compares bit for bit two 8-bit
words applied on inputs P0 - P7 and inputs Q0 -
Q7 and indicates whether or not they are equal. A
single active low enable is provided to facilitate
cascading several packages to enable
comparison of words greater than 8 bits.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M74HCT6888 BIT EQUALITY COMPARATOR
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
M74HCT6882/9
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE X: Don’t Care
LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays
M74HCT6883/9
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
DC SPECIFICATIONS
M74HCT6884/9
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
TEST CIRCUIT CL = 50pF/150pF or equivalent (includes jig and probe capacitance)
RT = ZOUT of pulse generator (typically 50Ω)
M74HCT6885/9
WAVEFORM : PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle)
