74HC257 Datasheet, PDF (6/13 Pages) NXP Semiconductors – Quad 2-input multiplexer 3-state

Philips Semiconductors
Quad 2-input multiplexer; 3-state
Product specification
74HC/HCT257
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
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
nI₀
nI₁
OE
S
UNIT LOAD COEFFICIENT
0.40
0.40
1.35
0.70
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
T_amb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT
V_CC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
t_PHL/ t_PLH propagation delay
nI₀ to nY
nI₁ to nY
t_PHL/ t_PLH propagation delay
S to nY
16 30
38
20 35
44
t_PZH/ t_PZL 3-state output enable time
15 30
38
OE to nY
t_PHZ/ t_PLZ 3-state output disable time
16 30
38
OE to nY
t_THL/ t_TLH output transition time
5 12
15
45 ns 4.5 Fig.6
53 ns 4.5 Fig.6
45 ns 4.5 Fig.7
45 ns 4.5 Fig.7
18 ns 4.5 Fig.6
1998 Sep 30
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