The 74AHC257-Q100; 74AHCT257-Q100 has four identical 2-input multiplexers with 3-state outputs. They select 4 bits of data from two sources and a common data select input (S) controls them. The data inputs from source 0 (1I0 to 4I0), are selected when input S is LOW. The data inputs from source 1 (1I1 to 4I1) are selected when input S is HIGH. Data appears at the outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs. The 74AHC257-Q100; 74AHCT257-Q100 is the logic implementation of a 4-pole 2-position switch. The logic levels applied to input S determine the position of the switch. The outputs are forced to a high-impedance OFF-state when OE is HIGH.
The logic equations for the outputs are:
1Y = OE x (1I1 x S + 1I0 x S)
2Y = OE x (2I1 x S + 2I0 x S)
3Y = OE x (3I1 x S + 3I0 x S)
4Y = OE x (4I1 x S + 4I0 x S)
This product has been qualified to the Automotive Electronics Council (AEC) standard Q100 (Grade 1) and is suitable for use in automotive applications.
Automotive product qualification in accordance with AEC-Q100 (Grade 1)
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
Balanced propagation delays
All inputs have Schmitt-trigger actions
Non-inverting data path
Inputs accept voltages higher than VCC
Input levels:
For 74AHC257-Q100: CMOS level
For 74AHCT257-Q100: TTL level
ESD protection:
MIL-STD-883, method 3015 exceeds 2000 V
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V (C = 200 pF, R = 0 Ω)
Multiple package options
| Type number | Product status | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 74AHC257D-Q100 | Production | 2.0 - 5.5 | CMOS | ± 8 | 2.9 | low | -40~125 | 94 | 10.3 | 53 | SO16 |
| 74AHC257PW-Q100 | Production | 2.0 - 5.5 | CMOS | ± 8 | 2.9 | low | -40~125 | 126 | 4.9 | 56.3 | TSSOP16 |
| 74AHCT257D-Q100 | Production | 4.5 - 5.5 | TTL | ± 8 | 3.7 | low | -40~125 | 93 | 9.7 | 52 | SO16 |
| 74AHCT257PW-Q100 | Production | 4.5 - 5.5 | TTL | ± 8 | 3.7 | low | -40~125 | 125 | 4.6 | 54.9 | TSSOP16 |
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