74AHC_AHCT257_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 9 May 2008 6 of 16
NXP Semiconductors
74AHC257; 74AHCT257
Quad 2-input multiplexer; 3-state
8. Recommended operating conditions
9. Static characteristics
Table 5. Operating conditions
Symbol Parameter Conditions Min Typ Max Unit
74AHC257
V
CC
supply voltage 2.0 5.0 5.5 V
V
I
input voltage 0 - 5.5 V
V
O
output voltage 0 - V
CC
V
T
amb
ambient temperature −40 +25 +125 °C
∆t/∆V input transition rise and fall rate V
CC
= 3.0 V to 3.6 V - - 100 ns/V
V
CC
= 4.5 V to 5.5 V - - 20 ns/V
74AHCT257
V
CC
supply voltage 4.5 5.0 5.5 V
V
I
input voltage 0 - 5.5 V
V
O
output voltage 0 - V
CC
V
T
amb
ambient temperature −40 +25 +125 °C
∆t/∆V input transition rise and fall rate V
CC
= 4.5 V to 5.5 V - - 20 ns/V
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit
Min Typ Max Min Max Min Max
74AHC257
V
IH
HIGH-level
input voltage
V
CC
= 2.0 V 1.5 - - 1.5 - 1.5 - V
V
CC
= 3.0 V 2.1 - - 2.1 - 2.1 - V
V
CC
= 5.5 V 3.85 - - 3.85 - 3.85 - V
V
IL
LOW-level
input voltage
V
CC
= 2.0 V - - 0.5 - 0.5 - 0.5 V
V
CC
= 3.0 V - - 0.9 - 0.9 - 0.9 V
V
CC
= 5.5 V - - 1.65 - 1.65 - 1.65 V
V
OH
HIGH-level
output voltage
V
I
= V
IH
or V
IL
I
O
= −50 µA; V
CC
= 2.0 V 1.9 2.0 - 1.9 - 1.9 - V
I
O
= −50 µA; V
CC
= 3.0 V 2.9 3.0 - 2.9 - 2.9 - V
I
O
= −50 µA; V
CC
= 4.5 V 4.4 4.5 - 4.4 - 4.4 - V
I
O
= −4.0 mA; V
CC
= 3.0 V 2.58 - - 2.48 - 2.40 - V
I
O
= −8.0 mA; V
CC
= 4.5 V 3.94 - - 3.80 - 3.70 - V
V
OL
LOW-level
output voltage
V
I
= V
IH
or V
IL
I
O
= 50 µA; V
CC
= 2.0 V - 0 0.1 - 0.1 - 0.1 V
I
O
= 50 µA; V
CC
= 3.0 V - 0 0.1 - 0.1 - 0.1 V
I
O
= 50 µA; V
CC
= 4.5 V - 0 0.1 - 0.1 - 0.1 V
I
O
= 4.0 mA; V
CC
= 3.0 V - - 0.36 - 0.44 - 0.55 V
I
O
= 8.0 mA; V
CC
= 4.5 V - - 0.36 - 0.44 - 0.55 V
