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74AHC257; 74AHCT257
Datasheet
(Product Specification)
09-May-08, 16 pages, 92 kB
General description
The 74AHC257; 74AHCT257 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL). It is specified in compliance with JEDEC standard No. 7-A.
The 74AHC257; 74AHCT257 has four identical 2-input multiplexers with 3-state outputs, which select 4 bits of data from two sources and are controlled by a common data select input (S). The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and 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; 74AHCT257 is the logic implementation of a 4-pole 2-position switch, where the position of the switch is determined by the logic levels applied to input S. 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)
The 74AHC257; 74AHCT257 is identical to the 74AHC258; 74AHCT258, but has non-inverting (true) outputs.
Features
- Balanced propagation delays
- All inputs have Schmitt-trigger actions
- Non-inverting data path
- Inputs accept voltages higher than VCC
- Input levels:
- For 74AHC257: CMOS level
- For 74AHCT257: TTL level
- ESD protection:
- HBM EIA/JESD22-A114E exceeds 2000 V
- MM EIA/JESD22-A115-A exceeds 200 V
- CDM EIA/JESD22-C101C exceeds 1000 V
- Multiple package options
- Specified from -40 Cel to +85 Cel and from -40 Cel to +125 Cel
Products/packages
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking | ECCN |
|---|---|---|---|---|---|---|---|
| 74AHC257D | 74AHC257D,112 | 9352 654 67112 | Volume production | SOT109 | Tube | Standard Marking | |
| 74AHC257D | 74AHC257D,118 | 9352 654 67118 | Volume production | SOT109 | Reel Pack, SMD, 13" | Standard Marking | |
| 74AHC257PW | 74AHC257PW,112 | 9352 654 68112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | |
| 74AHC257PW | 74AHC257PW,118 | 9352 654 68118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | |
| 74AHCT257D | 74AHCT257D,112 | 9352 654 69112 | Volume production | SOT109 | Tube | Standard Marking | |
| 74AHCT257D | 74AHCT257D,118 | 9352 654 69118 | Volume production | SOT109 | Reel Pack, SMD, 13" | Standard Marking | |
| 74AHCT257PW | 74AHCT257PW,112 | 9352 654 70112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | |
| 74AHCT257PW | 74AHCT257PW,118 | 9352 654 70118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking |
Quality/reliability/chemical content
| Type number | Orderable part number | Chemical content | RoHS | Leadfree Conversion date | RHF | IRF (FIT) | MTBF (hours) | MSL |
|---|---|---|---|---|---|---|---|---|
| 74AHC257D | 74AHC257D,112 | 74AHC257D |
| week 35, 2004 | 6,62 | 1,51E+08 | 1 | |
| 74AHC257D | 74AHC257D,118 | 74AHC257D |
| week 35, 2004 | 6,62 | 1,51E+08 | 1 | |
| 74AHC257PW | 74AHC257PW,112 | 74AHC257PW |
| week 10, 2005 | 6,62 | 1,51E+08 | 1 | |
| 74AHC257PW | 74AHC257PW,118 | 74AHC257PW |
| week 10, 2005 | 6,62 | 1,51E+08 | 1 | |
| 74AHCT257D | 74AHCT257D,112 | 74AHCT257D |
| week 35, 2004 | 6,62 | 1,51E+08 | 1 | |
| 74AHCT257D | 74AHCT257D,118 | 74AHCT257D |
| week 35, 2004 | 6,62 | 1,51E+08 | 1 | |
| 74AHCT257PW | 74AHCT257PW,112 | 74AHCT257PW |
| week 10, 2005 | 6,62 | 1,51E+08 | 1 | |
| 74AHCT257PW | 74AHCT257PW,118 | 74AHCT257PW |
| week 10, 2005 | 6,62 | 1,51E+08 | 1 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Orderable part number | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|---|
| 74AHC257D | 9352 654 67112 | 74AHC257D,112 | 0.2600 | not available | ||||||
| 74AHC257D | 9352 654 67118 | 74AHC257D,118 | 0.2600 | not available | ||||||
| 74AHC257PW | 9352 654 68112 | 74AHC257PW,112 | 0.2600 | not available | ||||||
| 74AHC257PW | 9352 654 68118 | 74AHC257PW,118 | 0.2600 | not available | ||||||
| 74AHCT257D | 9352 654 69112 | 74AHCT257D,112 | 0.2500 | not available | ||||||
| 74AHCT257D | 9352 654 69118 | 74AHCT257D,118 | 0.2500 | not available | ||||||
| 74AHCT257PW | 9352 654 70112 | 74AHCT257PW,112 | 0.2500 | not available | ||||||
| 74AHCT257PW | 9352 654 70118 | 74AHCT257PW,118 | 0.2500 | not available |
Parametrics/similar products
| Type number | Package | Description | Propagation Delay(ns) | Voltage | No. of Pins | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| 74AHC257D | SOT109
| Quad 2-Input MUX | 2.9@5V | 2.0-5.5 V | 16 | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHC257PW | SOT403-1
(TSSOP16) | Quad 2-Input MUX | 2.9@5V | 2.0-5.5 V | 16 | Low Power or Battery Applications | CMOS | +/- 8 mA |
| 74AHCT257D | SOT109
| Quad 2-Input Multiplexer; TTL Enabled (3-State) | 3.7 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 8 mA |
| 74AHCT257PW | SOT403-1
(TSSOP16) | Quad 2-Input Multiplexer; TTL Enabled (3-State) | 3.7 | 4.5-5.5 V | 16 | Low Power | TTL | +/- 8 mA |
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74AHC257; 74AHCT257
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