74HC251 Datasheet, PDF (6/7 Pages) NXP Semiconductors – 8-input multiplexer; 3-state

Philips Semiconductors
8-input multiplexer; 3-state
Product specification
74HC/HCT251
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_n
S₀
S₁, S₂
OE
UNIT LOAD COEFFICIENT
1.00
1.50
1.50
1.50
AC CHARACTERISTICS FOR HCT
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
SYMBOL PARAMETER
t_PHL/ t_PLH
t_PHL/ t_PLH
t_PHL/ t_PLH
t_PHL/ t_PLH
t_PZH/ t_PZL
t_PHZ/ t_PLZ
t_THL/ t_TLH
propagation delay
I_n to Y
propagation delay
I_n to Y
propagation delay
S_n to Y
propagation delay
S_n to Y
3-state output enable time
OE to Y, Y
3-state output disable time
OE to Y, Y
output transition time
T_amb (°C)
TEST CONDITIONS
74HCT
+25
−40 to +85
−40 to +125
UNIT
V_CC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
22 35
44
53 ns 4.5 Fig.6
22 35
44
53 ns 4.5 Fig.7
24 44
55
66 ns 4.5 Fig.6
25 44
55
66 ns 4.5 Fig.7
13 28
35
42 ns 4.5 Fig.7
14 28
35
42 ns 4.5 Fig.7
7 15
19
22 ns 4.5 Figs 6 and 7
December 1990
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