74HC85 Datasheet, PDF (7/9 Pages) NXP Semiconductors – 4-bit magnitude comparator

Philips Semiconductors
4-bit magnitude comparator
Product specification
74HC/HCT85
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
I_CC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆I_CC) for a unit load of 1 is given in the family specifications.
To determine ∆I_CC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
I_A<B
I_A>B
I_A=B
A_n, B_n
UNIT LOAD COEFFICIENT
1.00
1.00
1.50
1.50
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
T_amb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
min.
+25
typ. max.
74HCT
−40 to +85
min. max.
−40 to +125
min. max.
UNIT
V_CC
(V)
WAVEFORMS
t_PHL/ t_PLH propagation delay
26 44
55
66 ns 4.5 Fig.6
A_n, B_n to Q_A>B or Q_A<B
t_PHL/ t_PLH propagation delay
A_n, B_n to Q_A=B
24 40
50
60 ns 4.5 Fig.6
t_PHL/ t_PLH
propagation delay
I_A<B, I_A=B, I_A>B to
Q_A<B, Q_A>B
18 31
39
47 ns 4.5 Fig.6
t_PHL/ t_PLH propagation delay
I_A=B to Q_A=B
18 31
39
47 ns 4.5 Fig.6
t_THL/ t_TLH output transition time
7 15
19
22 ns 4.5 Fig.6
December 1990
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