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M74HCT688

ST Microelectronics
Part Number M74HCT688
Manufacturer ST Microelectronics
Description 8 BIT EQUALITY COMPARATOR
Published May 6, 2005
Detailed Description M54HCT688 M74HCT688 8 BIT EQUALITY COMPARATOR . . . . . . . HIGH SPEED tPD = 17 ns (TYP.) AT VCC = 5 V LOW POWER DISSI...
Datasheet PDF File M74HCT688 PDF File

M74HCT688
M74HCT688


Overview
M54HCT688 M74HCT688 8 BIT EQUALITY COMPARATOR .
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HIGH SPEED tPD = 17 ns (TYP.
) AT VCC = 5 V LOW POWER DISSIPATION ICC = 4 µA (MAX.
) AT TA = 25 °C COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN.
) VIL = 0.
8V (MAX) OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS SYMMETRICAL OUTPUT IMPEDANCE |IOH| = IOL = 4 mA (MIN.
) BALANCED PROPAGATION DELAYS tPLH = tPHL PIN AND FUNCTION COMPATIBLE WITH 54/74LS688 B1R (Plastic Package) F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HCT688F1R M74HCT688M1R M74HCT688B1R M74HCT688C1R PIN CONNECTIONS (top view) DESCRIPTION The M54/74HCT688 utilizes silicon gate C2MOS technology to achieve operating speeds equivalent to LSTTL devices.
Along with the low power dissipation and high noise immunity of standard C2MOS integrated circuit, it possesses the driving capability of 10 LSTTL load.
The M54/74HCT688 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.
This integrated circuit has input and output characteristics that are fully compatible with 54/74 LSTTL logic families.
M54/74HCT devices are 2 designed to directly interface HSC MOS systems with TTL and NMOS components.
They are also plug in replacements for LSTTL devices giving a reduction of power consumption.
All inputs are equipped with protection circuit against static discharge and transient excess voltage.
February 1993 NC = No Internal Connection 1/10 M54/M74HCT688 INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE INPUT P, Q P=Q P≠Q X X: DON’T CARE OUTPUT G L L H P=Q L H H LOGIC DIAGRAM 2/10 M54/M74HCT688 PIN DESCRIPTION PIN No 1 2, 4, 6, 8, 11, 13, 15, 17 3, 5, 7, 9, 12, 14, 16, 18 19 10 20 SYMBOL G P0 to P7 NAME AND FUNCTION Enable Input (Active LOW) Word Inputs IEC LOGIC SYMBOL Q0 to Q7 Word Outputs P=Q GND V CC Equal to Output Grou...


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