74HCT85D ,4-bit magnitude comparatorINTEGRATED CIRCUITSDATA SHEETFor a complete data sheet, please also download:• The IC06 74HC/HCT/HC ..
74HCT85D ,4-bit magnitude comparatorGENERAL DESCRIPTIONoutputs reflect the feed forward conditions that exist in theThe 74HC/HCT85 are ..
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7555IBA , General Purpose Timers
7555IBA , General Purpose Timers
7555IBAZ , General Purpose Timers
7555IPA , General Purpose Timers
7555IPA , General Purpose Timers
7555IPA , General Purpose Timers
74HC85D-74HC85N-74HC85PW-74HCT85D-74HCT85N
74HC/HCT85; 4-bit magnitude comparator
Philips Semiconductors Product specification
4-bit magnitude comparator 74HC/HCT85
FEATURES Serial or parallel expansion without extra gating Magnitude comparison of any binary words Output capability: standard ICC category: MSI
GENERAL DESCRIPTIONThe 74HC/HCT85 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT85 are 4-bit magnitude comparators that
can be expanded to almost any length. They perform
comparison of two 4-bit binary, BCD or other monotonic
codes and present the three possible magnitude results at
the outputs (QA>B, QA=B and QA
weighted (A0 to A3 and B0 to B3), where A3 and B3 are the
most significant bits.
The operation of the “85” is described in the function table,
showing all possible logic conditions. The upper part of the
table describes the normal operation under all conditions
that will occur in a single device or in a series expansion
scheme. In the upper part of the table the three outputs are
mutually exclusive. In the lower part of the table, the
outputs reflect the feed forward conditions that exist in the
parallel expansion scheme.
For proper compare operation the expander inputs (IA>B,
IA=B and IAconnected as follows: IAB== LOW and
IA=B= HIGH.
For words greater than 4-bits, units can be cascaded by
connecting outputs QAΒ and QA=B to the
corresponding inputs of the significant comparator.
QUICK REFERENCE DATA
GND= 0 V; Tamb =25 °C; tr =tf= 6 ns
Notes CPD is used to determine the dynamic power dissipation (PD in μW): =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:= input frequency in MHz= output frequency in MHz
∑ (CL × VCC2 × fo)= sum of outputs= output load capacitance in pF
VCC= supply voltage in V For HC the condition is VI= GND to VCC
For HCT the condition is VI= GND to VCC − 1.5 V
ORDERING INFORMATION
Philips Semiconductors Product specification
4-bit magnitude comparator 74HC/HCT85
PIN DESCRIPTION
Philips Semiconductors Product specification
4-bit magnitude comparator 74HC/HCT85
APPLICATIONS Process controllers Servo-motor control
FUNCTION TABLE
Notes H= HIGH voltage level= LOW voltage level
Philips Semiconductors Product specification
4-bit magnitude comparator 74HC/HCT85
Philips Semiconductors Product specification
4-bit magnitude comparator 74HC/HCT85
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND= 0 V; tr =tf= 6 ns; CL= 50 pF
