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74AHC257; 74AHCT257
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 | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| 74AHC257D | 74AHC257D | 9352 654 67112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHC257D
| week 35, 2004 |
| 74AHC257D | 74AHC257D-T | 9352 654 67118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC257D
| week 35, 2004 |
| 74AHC257PW | 74AHC257PWDH | 9352 654 68112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHC257PW
| week 10, 2005 |
| 74AHC257PW | 74AHC257PWDH-T | 9352 654 68118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHC257PW
| week 10, 2005 |
| 74AHCT257D | 74AHCT257D | 9352 654 69112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | 74AHCT257D
| week 35, 2004 |
| 74AHCT257D | 74AHCT257D-T | 9352 654 69118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT257D
| week 35, 2004 |
| 74AHCT257PW | 74AHCT257PW | 9352 654 70112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | 74AHCT257PW
| week 10, 2005 |
| 74AHCT257PW | 74AHCT257PW-T | 9352 654 70118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74AHCT257PW
| week 10, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| 74AHC257D | 9352 654 67112 | 0.2600 | not available | |||||
| 74AHC257D | 9352 654 67118 | 0.2600 | Order samples | |||||
| 74AHC257PW | 9352 654 68112 | 0.2600 | not available | |||||
| 74AHC257PW | 9352 654 68118 | 0.2600 | Order samples | |||||
| 74AHCT257D | 9352 654 69112 | 0.2500 | NA | ARROW ELECTRONICS | 1,927 | 11/21/2008 | Buy online | not available |
| 74AHCT257D | 9352 654 69118 | 0.2500 | NA | ARROW ELECTRONICS | 5,000 | 11/21/2008 | Buy online | not available |
| 74AHCT257PW | 9352 654 70112 | 0.2500 | not available | |||||
| 74AHCT257PW | 9352 654 70118 | 0.2500 | Order samples |
Parametrics/similar products
| Type number | Package | Description | Propagation Delay(ns) | Voltage | No. of Pins | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| 74AHC257D | SOT109-1
(SO16) | 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 | SOT109-1
(SO16) | 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 |
Similar products
74AHC257; 74AHCT257 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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