TC74HCT688AP/AF
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74HCT688AP, TC74HCT688AF
8-Bit Equality Comparator
The TC74HCT688A is a high speed CMOS 8-BIT EQUALITY
COMPARATOR fabricated with silicon gate C2MOS technology.
It achieves the high speed operation similar to equivalent
LSTTL while maintaining the CMOS low power dissipation.
This device may be used as a level converter for interfacing
TTL or NMOS to High Speed CMOS. The inputs are compatible
with TTL, NMOS and CMOS output voltage leveles.
The TC74HCT688A compares two 8-bit binary or BCD words
applied inputs P0 thru P7, and inputs Q0 thru Q7, and indicates
whether or not they are equal.
A signal active low enable is provided to facilitate cascading of
several packege to compare of words greater than 8 bits.
All inputs are equipped with protection circuits against atatic
discharge or transient excess voltage.
TC74HCT688AP
TC74HCT688AF
Features
•
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 = 2.0 V (min)
VIL = 0.8 V (max)
•
Output drive capability: 10 LSTTL loads
•
•
Symmetrical output impedance: |IOH| = IOL = 4 mA (min)
∼
Balanced propagation delays: tpLH − tpHL
•
Weight
DIP20-P-300-2.54A
SOP20-P-300-1.27A
: 1.30 g (typ.)
: 0.22 g (typ.)
Pin and function compatible with 74LS688
Pin Assignment
Start of commercial production
1988-11
1
2014-03-01