74AHC257 Просмотр технического описания (PDF) - Philips Electronics
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74AHC257 Datasheet PDF : 20 Pages
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Philips Semiconductors
Quad 2-input multiplexer; 3-state
Product specification
74AHC257;
74AHCT257
AC CHARACTERISTICS
Type 74AHC257
GND = 0 V; tr = tf ≤ 3.0 ns.
SYMBOL
PARAMETER
TEST CONDITIONS
WAVEFORMS CL
MIN.
25
TYP.
Tamb (°C)
−40 to +85
−40 to +125 UNIT
MAX. MIN. MAX. MIN. MAX.
VCC = 3.0 to 3.6 V; note 1
tPHL/tPLH
propagation delay
nI0 to nY; nI1 to nY
propagation delay
S to nY
see Figs 6
and 8
tPZH/tPZL 3-state output enable see Figs 7
time OE to nY
and 8
tPHZ/tPLZ 3-state output disable
time OE to nY
tPHL/tPLH
propagation delay
nI0 to nY; nI1 to nY
propagation delay
S to nY
see Figs 6
and 8
tPZH/tPZL 3-state output enable see Figs 7
time OE to nY
and 8
tPHZ/tPLZ 3-state output disable
time OE to nY
15 pF −
−
−
−
50 pF −
−
−
−
4.2 9.3 1.0 11.0 1.0 12.0 ns
5.2 11.0 1.0 13.0 1.0 14.0 ns
4.5 10.5 1.0 12.5 1.0 13.5 ns
5.1 9.5 1.0 11.0 1.0 11.5 ns
6.0 12.8 1.0 14.5 1.0 16.0 ns
7.4 14.5 1.0 16.5 1.0 18.5 ns
6.4 14.0 1.0 16.0 1.0 17.5 ns
7.2 12.0 1.0 13.5 1.0 14.5 ns
VCC = 4.5 to 5.5 V; note 2
tPHL/tPLH
propagation delay
nI0 to nY; nI1 to nY
propagation delay
S to nY
see Figs 6
and 8
tPZH/tPZL 3-state output enable see Figs 7
time OE to nY
and 8
tPHZ/tPLZ 3-state output disable
time OE to nY
tPHL/tPLH
propagation delay
nI0 to nY; nI1 to nY
propagation delay
S to nY
see Figs 6
and 8
tPZH/tPZL 3-state output enable see Figs 7
time OE to nY
and 8
tPHZ/tPLZ 3-state output disable
time OE to nY
15 pF −
−
−
−
50 pF −
−
−
−
2.9 5.9 1.0 7.0 1.0 7.5 ns
3.5 6.8 1.0 8.0 1.0 8.5 ns
3.2 6.8 1.0 8.0 1.0 8.5 ns
3.4 6.5 1.0 7.0 1.0 8.5 ns
4.2 7.9 1.0 9.0 1.0 11.5 ns
5.0 8.8 1.0 10.0 1.0 12.5 ns
4.5 8.8 1.0 10.0 1.0 12.5 ns
4.9 7.9 1.0 9.0 1.0 9.5 ns
Notes
1. Typical values at VCC = 3.3 V.
2. Typical values at VCC = 5.0 V.
2000 Apr 03
9
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